Earth Magazine quote about the formation conditions of Hadean zircon.

 

American Mineralogist: Journal of Earth and Planetary Science noted paper. 

"On page 1348 of this issue, Harrison and Wielicki examine 4.4 Ga zircons that appear to have formed from nearly water-saturated conditions, at low temperatures of ca. 680C. But they also show that Tertiary age granites in the Himalaya, formed by under-thrusting of the Indian plate beneath Asia, yield similar temperatures (ca. 660C). Moreover, these granites share more than a thermal history – both the ancient and more recently formed zircons contain inclusions that yield similar pressures, or 5-15 kbar. Two aspects of these results are remarkable, and highly significant; the first is that if nothing else, the Hadean exhibited, at least locally and for a time, a modern-like continental geotherm, effectively equivalent to a Miocene case (at ca. 25C/km). Second, to the extent that P-T conditions are indicative, a similar tectonic setting for both systems is implied; and if the association holds, then active plate tectonics – including subduction – occurred from almost the inception of Earth’s history."

 

Links to media coverage of Goldschmidt 2014 presentation about a new age of the Popigai impact structure, Russia and the possible association to the Eocene-Oligocene mass extinction event.  

LiveScience article

Huffington post article

Discovery article


Filming The Weather Channel show 'Secrets of the Earth' with the binary impact demo.

Link to The Weather Channel episode: Secrets of the Earth - It Fell from Space featuring discussion with Dr. Matthew M. Wielicki

Secrets of the Earth - It Fell from Space


Link to me on The Space Cave Podcast with David Hunstberger talking planetary exploration over some nice Saison Ale

Episode one

Episode two


Planetary profile video uploaded to YouTube by http://planets.ucla.edu