http://matthewwielicki.com/science daily 0.75 2023-04-14 https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446231676129-8OEN5RNBWSST0U16ZG21/image-asset.png Dr. Matthew Wielicki's science page Evolution of the number of cells with zero impact material (tracers) with time for 2D (A) and 3D (B) simulations. The time has been scaled using the advection time: thickness of the mantle divided by the root-mean square velocity at each time timestep. Q and Ra are respectively the non-dimensional internal heating rate and the Rayleigh number, and V represents the calculations with temperature dependent viscosity. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/8b0c46dc-55e0-421d-b512-39aaa7f6e0c7/Paper+fig.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841462739-SV6NFVC8HBVNAEGSS0F9/1-s2.0-S1342937X19300905-gr3_lrg.jpg Dr. Matthew Wielicki's science page (a) Nd isotopic data from post-32 Ma granitoids versus latitude. (b) Nd versus Sr isotope ratios showing inferred crustal values of εNd south of 29.9°N (−6) and north of that latitude (−8). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446228940765-HV2S416XRSHQ0TOYE5N6/image-asset.png Dr. Matthew Wielicki's science page Titanium concentrations and Ti-in-zircon crystallization temperature, assuming αTiO2=1 (Watson and Harrison, 2005), of impact produced zircon. Saturation temperature underestimates crystallization temperature for differentiated impact melts (i.e. Sudbury and Morokweng; Watson and Harrison, 2005) (A) Sudbury impact produced zircon Tzir xtln=748±60 °C, bulk norite Tzir sat=650 °C (calculated from Lightfoot and Zotov, 2005). (B) Morokweng impact produced zircon Tzir xtln=797±70 °C, bulk melt sheet Tzir sat=730 °C (calculated from Andreoli et al., 1999). (C) Manicouagan impact produced zircon Tzir xtln=747±35 °C, bulk melt sheet Tzir sat=752 °C (calculated from Floran et al., 1978). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841064383-52OR8SQL06QX99VOAXT8/436f5.png Dr. Matthew Wielicki's science page Southern Badwater turtleback full data plot with a–a′ cross-section (Fig. 3). Geology after Miller and Pavlis (2005). Vertical thickness of plotted objects indicates error, which is exaggerated for some Ar/ Ar ages to make them more easily visible. Box at left shows zircon (U-Th)/He ages from southern Black Mountains from Bidgoli et al. (2015). See text for explanation of cooling ages. Full data tables are available in the Data Repository (see text footnote 1). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1464891723823-GL1F4HRVV0YMP2AUZMPB/image-asset.png Dr. Matthew Wielicki's science page Electron micrograph of Arunachal zircon 0602010g2. Note the core/rim relationship with the younger rim exhibit the lower crystallization temperature and higher δ18O value compared with the older, higher temperature and isotopically lighter core. The muscovite inclusion exhibits a quasi-hexagonal crustal habit and coexists with feldspar. The elliptical feature in the feldspar marks the EMPA spot. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446231567001-0E3YAW2DT4TCS9918630/image-asset.png Dr. Matthew Wielicki's science page Snapshots of 2D and 3D calculations showing the temporal tracer density distribution through the mantle, in the presence of a fully developed thermal convection for 2 specific examples. The thickness of the layer of impactor material represents 0.2 of mantle thickness, corresponding to 580 km. The internal heating is set at a non-dimensional value of 20.0. An extensive parametric study has been performed in 2D for several values of Rayleigh number and internal heating. Select cases will be further explored in 3D. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446231765145-XT9J74XLBZ9T5P1N39AF/image-asset.png Dr. Matthew Wielicki's science page (A) After the moon-forming impact and final stages of core formation the Earth’s mantle should have been significantly depleted in HSE at proportions equivalent to their respective distribution coefficients. Chondritic enrichment of HSE in the mantle is attributed to delivery via impacts in the 'late veneer' hypothesis. (B) Data from Maier et al. (2009) suggests that the early mantle was highly depleted in PGE relative to today with progressive increases until approximately 2.5 Ga, to present day values. These results suggest that PGE additions during a period of intense bombardment did not efficiently mix PGE back into the lower mantle suggesting the presence of an isolated stable surface reservoir (ISSR). (C) From >4 Ga the PGE contents of the mantle progressively increases until ~2.5 Ga to its present day value. Although the impact flux had dramatically decreased the PGE contents continue to rise, implying that at least some portion of the lithosphere, contaminated with chondritic PGE from impact ejecta and condensation of impact vapor plumes, remained stable and isolated from >4 Ga and was not completely mixed into the mantle for at least 1.5 Ga. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1e3cad6c-3176-4a35-9e48-d875c364855f/Capture9.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446160589516-4JOEB55WZ42VKCUK3Q6F/GRL+Fig1.PNG Dr. Matthew Wielicki's science page Back scattered electron images via LEO 1430 VP scanning electron microscope with measurements used for standard α-ejection corrections and morphometric analyses [Reiners, 2005]. Grains appear euhedral to subhedral for both Morokweng (A&B) and Vredefort (C&D) with some exterior fractures (D) but no evidence for impact shock features within zircon cores (see inlay in Figure 2 & 4) [Wittmann et al., 2006]. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1464892196100-HERF9FMID6D9Z2SA78XN/image-asset.png Dr. Matthew Wielicki's science page Cross-section reconstruction of the eastern Himalaya along 92°E transect, ~200 km SW of the Siang window. This places Cretaceous- Paleogene molasse mapped in the window structurally beneath the present day position of the Arunachal leucogranites. Modified from Yin et al. (2009). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446230014431-RWZ46CKRE7LFBROQRDZ7/image-asset.png Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/ed2558de-0471-40b0-b42b-1ea60e28a36a/Paper+fig+2.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446161076329-YSL0HDKJ4EP36VHVX1EG/image-asset.png Dr. Matthew Wielicki's science page Depth profiles of Morokweng basement zircon to identify presence of epitaxial overgrowth rims coincident with the impact. No evidence of rims with Morokweng impact ages were observed on Archean target zircon cores. Insets are BSE and CL images of depth profiled grains showing oscillatory zoning and CL-active rims. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446159418112-9G6YVDR4ZWYSBLBQA7K2/image-asset.png Dr. Matthew Wielicki's science page BSE images of in-situ VD_PB zircon (image A) and VD_G zircon (images B-F) compared to images of lunar meteorite SaU 169 (images G & H; Liu et al., 2012), highlighting similar poikilitic textures. See text for further description. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486172265-HO3KQ4CSADF15RURPT18/Capture8.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/691f298c-5024-4514-9e06-a556d43de07e/Paper+fig+3.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1464891641575-WHZNB6AVTH20T3M9R3VN/image-asset.png Dr. Matthew Wielicki's science page Relative probability plot of zircon crystallization temperatures for Himalayan leucogranites from the 92°E transect in eastern Himalaya relative to the Hadean zircon population. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446160997467-ZW5DLKLT1LSE861WL2PN/image-asset.png Dr. Matthew Wielicki's science page Concordia plot for zircons extracted from the main melt sheet (A) of the ~145 Ma Morokweng impact, from both the 155 and 400 m core splits [Wielicki et al., 2012], as well as a concordia plot for grains extracted from the Archean basement gneiss (B), from the 1069 m core split. Basement zircons show inherited Archean ages with some Pb*-loss, however errors on lower intercept are much too large to assign an accurate impact age. No evidence for grains 'reset' in U-Pb has been identified. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1464891519662-CFIPZCXM2O1JF3HRYI5D/image-asset.png Dr. Matthew Wielicki's science page (a) Probability density function of <30 Ma 206Pb/238U zircon ages from the Arunachal leucogranite suite. (b) Probability density function of >30 Ma 207Pb/206Pb zircons from the Arunachal leucogranite suite. Note the different enlarged scale of relative probability of b compared to a. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446230273947-3AB7NP6BSXYAILUF6QD8/image-asset.png Dr. Matthew Wielicki's science page P–T pseudo-section calculated for the Bullenbalong cordierite granite in the presence of q, pl and bio. Phase regions depicted with grey shading denote muscovite unstable with melt, whereas red colors show regions where muscovite and melt stably coexist. Darker shading indicates higher variance of phase assemblages. Selected contours of predicted Si content in muscovite (3.08–3.24, in moles per formula unit) are shown with light lines. Phase abbreviations: bi, biotite; mu, muscovite; sill, sillimanite; q, quartz; pl, plagioclase; liq, granitic melt; g, garnet; cd, cordierite; ksp, K feldspar [Hopkins et al., 2008, 2010]. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/4f247f35-2d7e-4771-86f0-38370d29cbf6/Capture6.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446159545706-PI4QV9NIYFLSLVNUSZLL/image-asset.png Dr. Matthew Wielicki's science page Concordia diagrams of zircon from the ~2 Ga Vredefort impact calibrated against AS3 zircon standard (Paces and Miller, 1993). (A) Grains analyzed in-situ within the melt matrix of VD_PB show these grains are inherited from the Archean basement and possibly record thermal effects associated with emplacement of the ~1 Ga Anna's Rust Sheet. (B) Grains isolated from the granophyre unit which exhibit poikilitic textures also show inheritance from the Archean target, with varying amounts of Pb-loss and a lower intercept presumably associated with the impact. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446432802970-LLVGJK401YL0LGEWMJ5W/image-asset.png Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681485388525-75KX0S5AKRHBF5YG29DS/Capture.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841429978-S5MWYITE1J887RC30NJK/1-s2.0-S1342937X19300905-gr2_lrg.jpg Dr. Matthew Wielicki's science page (a) Nd isotopic data from pre-45 Ma granitoids versus latitude. Also shown are the range of values for the Sangri (Sa), Yeba (Ye) and Linzizong (Lz) volcanic sequences. (b) Nd versus Sr isotope ratios. Crustal εNd values, estimated from metasedimentary samples and two-mica granites, are −10 south of 29.9°N and −12 north of that latitude. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573840914133-Y5H3XVQES4VWP22GOO8V/436f1.png Dr. Matthew Wielicki's science page Digital elevation model of Death Valley, California, region with geologic overlay after Miller and Pavlis (2005). Diagonal line indicates approximate direction of top-to-NW extension. BWT—Badwater turtleback, CCT—Copper Canyon turtleback, MPT—Mormon Point turtleback, DVFC—Death Valley–Furnace Creek, DVBM—Death Valley–Black Mountains, SHF—Sheep Head fault. The map projection is WGS84. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681485547203-PISWO2JO4YV7Z8M12CBF/Capture2.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446230135989-XSR0KNPW635D9YCFI6H6/image-asset.png Dr. Matthew Wielicki's science page SEM image of zircon RSES61_15.11 showing high-aspect-ratio muscovite inclusion interpreted to indicate trapping of a magmatic crystal during zircon growth. Positions of U–Pb and Ti analyses also shown [Hopkins et al., 2008, 2010]. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446228520121-CJAEX6PAG5O7M7FVJIJ7/epsl+fig1.PNG Dr. Matthew Wielicki's science page Sample location for preserved terrestrial impactites. (A) Vredefort Impact, South Africa (after Gibson and Reimold, 2008) showing locations of pseudotachylite breccia and granophyre hand sample (VD_PB, VD_G) as well as drill core INL (VD_INL). (B) Map of Sudbury Impact, Canada and cross-section of the Sudbury Igneous Complex showing norite layer (Sud_F and Sud_M; after Zieg and Marsh, 2005). (C) Morokweng Impact, South Africa (after Jourdan et al., 2010) showing location and cross section of drill core M3 (MK_157 and MK_399). (D) Manicouagan Impact, Canada showing location of main melt sheet sample (MC_MM; after O'Connel-Cooper and Spray, 2011). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/20e60dc1-f500-4675-b5f1-ae1fd9d415a5/Capture7.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841010903-VZ24B6RJNU6OKT47P6SK/436f3.png Dr. Matthew Wielicki's science page Digital elevation model of the Badwater turtleback (BWT) with geologic overlay after Miller and Pavlis (2005) with thermochronometric sample locations. Sample locations and elevations (this study) are shown along southern end of BWT. White circles are geochronological and thermochronometric age locations from this study, and white triangles are previously published thermochronometric age locations. Data from this study are projected onto line a–a′ and plotted in Figure 5. Zircon (U-Th)/He (zHe) and apatite (U-Th)/He (aHe) ages are from Bidgoli et al. (2015). Zircon fission track (zFT), biotite Ar/Ar (b), and muscovite Ar/Ar (m) ages are from Holm et al. (1992) and Holm and Dokka (1993). The map projection is WGS84. WSD—Willow Spring diorite; SMG—Smith Mountain granite. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486248917-YPLJKAE25M29S0K74214/Capture11.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841496968-0BVOJ2FLKOTJF17E9XUE/1-s2.0-S1342937X19300905-gr4_lrg.jpg Dr. Matthew Wielicki's science page Nd isotopic values (εNd) of Cretaceous metasedimentary rocks and 30 Ma two-mica granites used to define the composition of the crustal component for the assimilation-recharge model. The εNd values are calculated to an age of 50 Ma. One sample with high εNd is a volcanogenic phyllite. The grey shaded zones are the values used for the crustal thickness estimates; the εNd values are inferred to be slightly different north and south of 29.9°N. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841606648-SUN8QITVP2A1GKSWXRE4/1-s2.0-S1342937X19300905-gr8_lrg.jpg Dr. Matthew Wielicki's science page Summary diagram of inferred crustal thickness versus latitude at the longitude of Lhasa (about 91°E). The syn-collision southern margin of the Lhasa bock had a stepped thickness profile; thin at the southern margin and extending northward to what is currently 29.8°N. Between 29.8°N and 29.9°N the crustal thickness changed to 50–60 km, an inference based on granite Nd isotopes and La/Yb ratios, and consistent with paleo-elevation studies and the occurrence of widespread Eocene ignimbrites. Between 45 and 30 Ma the region between 29.3° and 29.9°N was dramatically thickened to roughly 70 km, but the region north of 30.2°N may not have been further thickened. Some of the thickening was from magmatic additions, but not most of it. The Miocene erosion profile is based on U,Th-He thermochronometry (Schmidt et al., 2019) and is consistent with the 30 Ma thickness profile shown. Subsequent to 20–30 Ma, there must have been additional uniform further thickening of 10–15 km to account for the present crustal thickness. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841096321-X8KLBJXQ60IHWDBSXH11/436f7.png Dr. Matthew Wielicki's science page Cooling envelopes for the Badwater turtleback (BWT; this study), Copper Canyon turtleback (CCT; Holm and Dokka, 1993), Mormon Point turtlebacks (MPT; Holm and Dokka [H&D], 1993), and crystallization ages (this study) of the adjacent Smith Mountain granite (SMG) and Willow Spring diorite (WSD) with intrusion depth estimates from Holm et al. (1992). The BWT cooling envelope is an outline of cooling ages, inclusive of error of closure temperature and measured age (this study; Fig. DR9 [see footnote 1]). Raw K-feldspar cooling ages were excluded (explanation in the Data Repository text). CCT and MPT envelopes are based on the uncertainty of cooling ages of Holm and Dokka (1993). Depth and exhumation rates on the Y-axis are based on a 30 °C/km geothermal gradient. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446231193092-Y6ISRTKPEIKVVO13WSRX/image-asset.png Dr. Matthew Wielicki's science page Core formation should have quantitatively stripped highly siderophile elements from the mantle, but these elements are only depleted by a factor of ~170. Assuming the budget of these elements in the mantle comes from a late veneer similar to the average composition of chondrites, the mass of the late veneer is constrained to ~0.6% the mass of the bulk silicate Earth, or ~2.5×1022 kg. BSE composition is from Becker et al. (2006) and meteorite compositions from Horan et al. (2003). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446229236007-5Q4F972LUETZTGK37DIK/image-asset.png Dr. Matthew Wielicki's science page Probability density function for Ti-in-zircon crystallization temperatures of Hadean zircon from Western Australia (n=69; Harrison, 2009), mafic zircon (n=304; Fu et al., 2008), impact produced zircon (n=111; this study) and modeled impact produced zircon temperatures (n=80; this study). The significant temperature contrast between impact produced zircon, modeled impact produced zircon (on an Archean target composition) and that observed for Hadean zircon grains suggests that impacts were not a major contributor to the Hadean population. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841142354-MHYFQN48STKV5ETV3MNZ/436f8.png Dr. Matthew Wielicki's science page Schematic block diagrams of our evolutionary model for the Black Mountains in Death Valley, California. See text for supporting evidence of each depicted event. WSD—Willow Springs diorite; SMG—Smith Mountain granite. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681485478226-MQ8LRQ02Z4M4NSIZ7FTM/Capture1.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681485770906-98DNO3TCFVAPFSM5BJDG/Capture6.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681485924880-9SZWSPTA6PNCZG89NH3B/Capture7.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1464891815316-AWC6RT0QU5GMOCOIF5FW/image-asset.png Dr. Matthew Wielicki's science page Rb/Sr vs. Sr plot (left) and Rb/Sr vs. Ba plot (right) for Himalayan leucogranites (in warm colors), the Arunachal leucogranites (black circles), averages for the Greater Himalayan Crystallines (open stars), the two host orthogniesses from this study (filled stars), and the field of GHC gneisses from the study of Vidal et al. (1982) in gray (one anomalously low Rb/Sr datum is omitted). Note that the covariance vector expected for muscovite vapor absent melting (musc VA) is parallel to the trend exhibited by all Himalayan leucogranites except Arunachal, which falls between that array and the trend for basement rocks but within the variance shown in gray. The fraction of melting used in the vector calculation is given by F. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486224392-YP9W80BV0BQEBUXQTD6V/Capture10.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486326615-7KRYAGA0PJ1MYR6DU211/Capture14.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446228788226-7T6LNGM1LE0089SOCY6W/epsl+fig2.PNG Dr. Matthew Wielicki's science page Concordia diagrams of zircon extracted from preserved terrestrial impactites calibrated against AS3 zircon standard (Paces and Miller, 1993). (A) Nearly all grains extracted from Vredefort are inherited from the target with exception of two grains from the INL borehole (denoted in red) which yield ages similar to the published impact age (~2020 Ma; 207Pb/206Pb TIMS zircon age; Kamo et al., 1996; Moser, 1997). (B) Zircon from the mafic norite of the Sudbury Igneous Complex yield ages in agreement with the published impact age (1849.5±0.2 Ma; 207Pb/206Pb TE-TIMS zircon age; Davis, 2008)with no signs of inheritance from the target rock. (C) Grains from the Morokweng borehole M3 yield ages similar to, however slightly older than, the published impact age (145±0.8 Ma; 207Pb/206Pb ID-TIMS zircon age, 40Ar/39Ar biotite age; Hart et al., 1997) with no sign of inheritance. (D) Zircon from the Manicouagan impact yield ages identical to those from previous studies (214±1 Ma; 207Pb/206Pb TIMS zircon age; Hodych and Dunning, 1992) and show no inheritance also. (E) No impact produced zircon has been extracted from the Popigai samples provided for this study with all grains reflecting target rock ages. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841345203-F5H6BDWPRX49UAPM1QSK/1-s2.0-S1342937X19300905-gr1_lrg.jpg Dr. Matthew Wielicki's science page Geologic map of portion of southeast Tibet covering ~50,000 km2 from longitude 89.5 to 92.3 E and latitude 29 to 31 N, showing the distribution of calc-alkaline granitic (red-purple) and metasedimentary units (green) sampled in this study as well as other relevant geologic units (modified from 1:250,000 scale maps from China University of Geosciences Press Co., Ltd. including: Dangxiong District, H46C002001; Memba District, H46C002002; Lhasa District, H46C003001; Zedong District, H46C003002. Western portion, west of 90E, modified from Kidd et al., 1988. Further modification made from multiple field expeditions throughout the area by the authors and colleagues. Squares, circles and triangles indicate locations of samples (see table for references) used for Nd isotope analyses. Squares and circles show locations of peraluminous and metaluminous granites, respectively, and pre- or post-collisional crystallization age with grey fill indicating >48 Ma and white fill representing < 32 Ma. Grey triangles show locations of pre-collisional metasedimentary units sampled. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/fd509520-ab8b-4f9c-914d-6d9620f28330/Paper+fig+1.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1464891295612-GZ5EOW4KU804V08DQL0Q/Capture.PNG Dr. Matthew Wielicki's science page Geologic map of the 92° E transect showing sample locations in the sills and dikes of the Arunachal leucogranites and their relationship to the Tsona leucogranites further north. Geology from Pan et al. (2004). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/dbc8f283-d274-45f5-bbd0-9a59bcfcfe40/Capture5.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446160934479-GBR592O5VVAOPVYEOPC5/image-asset.png Dr. Matthew Wielicki's science page Log record of borehole M3, which includes the Morokweng meteorite, drilled into the center of the aeromagnetic anomaly at the impact structure, showing locations where zircons were extracted and analyzed. Inset are BSE images of grains from individual portions of the melt with their SIMS spot ages showing little disturbance of the target in U-Pb, Archean Pb-Pb ages, but complete resetting in (U-Th)/He age. Modified after Hart et al., (2002). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486275631-27N9M9MI94LNJK26YZ4G/Capture12.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841573427-V5EEIFK9F51GX0U51OMT/1-s2.0-S1342937X19300905-gr6_lrg.jpg Dr. Matthew Wielicki's science page Crustal thickness profile of southern Lhasa Block near the longitude of Lhasa inferred from Nd isotopes and assimilation-recharge model. (a) Profile (grey line) based on Nd isotopic compositions of pre-45 Ma granitoids. The letter “L” indicates the latitude of samples of sampled Linzizong volcanic rocks. (b) Thickness profile (black line) inferred from post-32 Ma granitoids. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446229080405-JI5NA9MN35X812R7O89Z/image-asset.png Dr. Matthew Wielicki's science page Trace element plots of impact produced zircon from Morokweng, Sudbury and Manicouagan to discriminate between continental and oceanic target rock compositions. All grains are corrected for uranium decay. Continental field from Grimes et al. (2007) with lower boundary denoted by a solid line on each diagram, indicating the upper most limit of unambiguously oceanic zircon. End points for lines: U vs. Yb (25, 1), (20,000, 10,000); U/Yb vs. Hf (5000, 0.05), (35,000, 5); U/Yb vs. Y (200, 0.01), (100,000, 5). Nearly all impact produced zircon suggest continental target lithologies however Manicouagan plots nearly in the oceanic field possibly due to a slightly more mafic target. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681485744727-ZGQVJUS55M28GCFRUDW4/Capture5.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486199324-L2URM8O7OJLKWF435UUJ/Capture9.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486352607-703YZ2E17LAQ1ANKALZ8/Capture15.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486399680-9SFM1YOY4Z8F9TYFA5F9/Capture17.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1464892263546-IIH2RE04WDU7ILGSACP0/image-asset.png Dr. Matthew Wielicki's science page Results of a thermo-kinematic simulation of the late Tertiary evolution of the Himalaya after 35 Ma of coupled underplating and surface exhumation. The black dots mark the position of the modeled Main Central thrust (MCT)—the boundary between oppositely verging units. The black arrows show the relative velocity field on either side of the MCT. The region outlined in white corresponds to the pressure-temperature range of 650 to 750 °C and 6 to 18 kbars documented in both Arunachal and Hadean zircons. Modified from Célérier et al. (2009). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446230387681-J3ACBEKUXATDIAHF2WFA/image-asset.png Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446230499709-UXSA307YPYPKBU58SJAU/image-asset.png Dr. Matthew Wielicki's science page Si/Al ratio under O- bombardment in SIMS of standards characterized for Sipfu by EPMA. Results suggest SIMS Si/Al ratio can be used as a good proxy for Sipfu and permits analysis of microscale unknowns and experimental products. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486299236-Y9DL4K1FQWOM0PIQIMN4/Capture13.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1573841545983-SRDGU6B5RMCLDC7MRZ81/1-s2.0-S1342937X19300905-gr5_lrg.jpg Dr. Matthew Wielicki's science page Crustal thickness estimates as related to Neodymium Crustal Index (NCI) and to chondrite-normalized La/Yb. (a) Relationship of thickness to NCI shown with approximate uncertainty estimate from a Monte Carlo approach where temperature is specified and all other parameters are allowed to vary within specified limits (details in appendix). (b) Crustal thickness as related to observed, aerially averaged La/YbN of granitoids with SiO2 between 54 and 68%. Subduction-related granites from Farner and Lee (2017) and collisional granites from Hu et al. (2017). The data in panel b include samples from Tibet, but those are younger than the granites discussed in this study. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446231443886-IVTT3ACZVIU77ZWMZ0H8/cider+fig1.PNG Dr. Matthew Wielicki's science page Pt versus age of komatiites. Data are normalized to 25% MgO. Data include those from Maier et al., (2009) and Barnes and Fiorentini (2008). EG, Eastern Goldfields superterrane (EG-G, Gindalbie terrane; EG-Ka, Kalgoorlie terrane; EG-Ku, Kurnalpi terrane). YN, Yilgarn North (Plutonic Marymia belt). Ka, Karelian terrane (Ka-Ko, Kostamuksha belt; Ka-Ku, Kuhmo belt; Ka-S, Sumozero-Kenozero belt). Y, Youanmi terrane (Y-M, Murchison domain; Y-Ss, Sandstone belt; Y-Rv, Ravensthorpe belt). RW, Ruth Well formation. SS, Sulphur Springs formation. WM, Weltevreden-Mendon formation. E, Euro basalt unit. A, Apex basalt unit. Ho, Hooggenoeg formation. Ko, Komati formation. Co, Coonterunah subgroup. Sa, Sandspruit formation. The inset toashows additional data for Proterozoic komatiites (Go, Gorgona island; R, Raglan belt; K, Karasjok belt; G, Gawler craton). Error bars represent one standard error of the mean for each belt, except for suites with fewer than five samples, in which error bars represent standard deviation. Also shown are four concepts of the late lunar bombardment. The “100 Ma half-life” is Neukum’s standard lunar crater curve for times after 3.86 Ga. It is calibrated to crater counts and surface ages from Apollo landing sites and the Imbrium impact basin (Neukum and Ivanov, 1994; Neukum et al., 2001). The steeper “50 Ma half-life” extrapolation uses the same data but it also uses the young 3.92 Ga age for the Nectaris impact basin and crater densities on still older but undated surfaces (after Wilhelms, 1987). The “single cataclysm” is a schematic but quantitatively representative late cataclysm as advocated by Graham Ryder (2002). “Multiple cataclysms” scatters several cataclysms over the Hadean (Tera et al. 1974). Figure adopted from Zahnle et al. (2007) and Maier et al. (2009). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/eee79e3a-c6ad-4546-ac91-8d68bacd9de9/Paper+fig+4.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446158883359-SP4OH31ZGZ35PXS0RQFI/LMIV+Fig1.PNG Dr. Matthew Wielicki's science page Modeled crystallization temperature spectrum for zircons within simulated impact events on the lunar surface. Predicted zircon crystallization temperatures are significantly higher than reported Ti-in-zircon crystallization temperatures within lunar impact melts, suggesting that these grains did not form within lunar impact melts. Also shown are modeled results for impacts on an ancient terrestrial crust as compared to Hadean zircon from the Jack Hills, Western Australia and zircon grown in large terrestrial impact melts (Wielicki et al., 2011). https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/61ba6472-9169-44a5-9751-a200c4d10941/Capture8.JPG Dr. Matthew Wielicki's science page - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681485661867-TBWEZ3B6ZQ5ZTEFL82LY/Capture3.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681485684584-3QR0BA840R43RJ74QASX/Capture4.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1681486381256-GXVB1FG9HCA4QKVGZXDM/Capture16.JPG Dr. Matthew Wielicki's science page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446229310920-2CNEIUH58WRHNTMOKHHD/image-asset.png Dr. Matthew Wielicki's science page GEOROC Archean database (n=10,058) plotted as M vs SiO2. Top axes are experimental results from Wyllie (1977) at 5 kbar, whereby the upper and lower axes represent liquidus temperatures at 5 wt.% H2O and water-undersaturated solidus temperatures, respectively. Wyllie (1977) dashed line is a fit ofMvs. SiO2 for melting experiments using felsic, intermediate and mafic compositions. This fit coincides with the regression of M vs. SiO2 for bulk composition of impactites from this study, which underscores the validity of using experimental melting relations to model impactite formation. http://matthewwielicki.com/photos daily 0.75 2015-11-02 https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446427672444-G7Q0KL76T4BOCXHQIT2J/P1030635.JPG Dr. Matthew Wielicki's photos from the field page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446427718506-MRE0YMHFXXS4MLBA4KIC/P1030636.JPG Dr. Matthew Wielicki's photos from the field page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446427683024-WQ5IJFHY41ZUK150JYST/P1030637.JPG Dr. Matthew Wielicki's photos from the field page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446427692025-71KL5LIPZZ9TN8G69KVS/P1030638.JPG Dr. Matthew Wielicki's photos from the field page 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Wielicki's photos from the field page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446422101061-J5P7V7709DAGJKKDO1R5/DSCN5614.JPG Dr. Matthew Wielicki's photos from the field page http://matthewwielicki.com/contact daily 0.75 2015-11-01 http://matthewwielicki.com/home daily 1.0 2023-05-15 https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446311653618-DG5EQ0XSF1CWWN1Z8GHM/Dr.+Matthew+M.+Wielicki+with+Tibetan+children+at+Nam+Co%2C+Tibet%2C+China. Home page Dr. Matthew M. Wielicki with Tibetan children at Nam Co, Tibet, China. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446154043493-3XFLOSU887EUPTFYBUFZ/IMG_4879.JPG Home page http://matthewwielicki.com/teaching daily 0.75 2022-05-10 https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446435179365-WRMWKIT11PG361GIZ61E/image-asset.jpeg Dr. Matthew Wielicki's teaching page Taking UCLA students to witness some green technologies at the Solar Energy Generating Systems in the Mojave Desert. https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446435846053-FEEDLPQNAL8XJ2SLIC1R/IMG_0381.JPG Dr. Matthew Wielicki's teaching page Getting the kids involved during the Venus transit. http://matthewwielicki.com/media daily 0.75 2023-10-04 https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446433751548-J9DONZWRKCK0FY0JMOOF/image-asset.png Dr. Matthew Wielicki's media page Dr. Matthew M. Wielicki resting above 5000 meters (16,404 feet) near Lhasa, Tibet, China https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1475260413820-32S30Z25LVPX07UWV65P/image-asset.jpeg Dr. Matthew Wielicki's media page https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446432103642-ITZFP5NU3N2JUEFI7ILX/image-asset.jpeg Dr. Matthew Wielicki's media page Filming The Weather Channel show 'Secrets of the Earth' with the binary impact demo. http://matthewwielicki.com/curriculumvitae daily 0.75 2023-02-17 https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446307542721-W8IJXXKX7XTMAWZ8GPD1/image-asset.jpeg Dr. Matthew Wielicki's curriculum vitae page Dr. Matthew M. Wielicki in the Jack Hills, Western Australia at the location where the Hadean zircons have been discovered. http://matthewwielicki.com/publications daily 0.75 2023-02-17 https://images.squarespace-cdn.com/content/v1/56327ad7e4b0733dcc08bab5/1446307338439-3IMZPENTZQL2AP5MFWPG/image-asset.jpeg Dr. Matthew Wielicki's publications page Dr Matthew M. Wielicki investigating the overturned Coconino ejecta layer at Meteor Crater, Arizona. http://matthewwielicki.com/read-me daily 0.75 2025-05-12 https://images.squarespace-cdn.com/content/v1/53dbbca5e4b090699000a2b6/1408024912028-NID23B61L4HJ0B3VYYKL/image-asset.png Read Me Photography by Julia Robbs