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  • 2010-2014  (1)
  • 1
    Publication Date: 2014-08-01
    Description: The history of the Hadean Earth ( approximately 4.0-4.5 billion years ago) is poorly understood because few known rocks are older than approximately 3.8 billion years old. The main constraints from this era come from ancient submillimetre zircon grains. Some of these zircons date back to approximately 4.4 billion years ago when the Moon, and presumably the Earth, was being pummelled by an enormous flux of extraterrestrial bodies. The magnitude and exact timing of these early terrestrial impacts, and their effects on crustal growth and evolution, are unknown. Here we provide a new bombardment model of the Hadean Earth that has been calibrated using existing lunar and terrestrial data. We find that the surface of the Hadean Earth was widely reprocessed by impacts through mixing and burial by impact-generated melt. This model may explain the age distribution of Hadean zircons and the absence of early terrestrial rocks. Existing oceans would have repeatedly boiled away into steam atmospheres as a result of large collisions as late as about 4 billion years ago.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marchi, S -- Bottke, W F -- Elkins-Tanton, L T -- Bierhaus, M -- Wuennemann, K -- Morbidelli, A -- Kring, D A -- England -- Nature. 2014 Jul 31;511(7511):578-82. doi: 10.1038/nature13539.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Southwest Research Institute, Boulder, Colorado 80302, USA. ; 1] Carnegie Institution for Science, Washington DC 20015, USA [2] School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287, USA. ; Museum fur Naturkunde, Berlin 10115, Germany. ; Observatoire de la Cote d'Azur, Nice 06304, France. ; Universities Space Research Association, Lunar and Planetary Institute, Houston, Texas 77058, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="" target="_blank"〉PubMed〈/a〉
    Keywords: Computer Simulation ; *Earth (Planet) ; History, Ancient ; Hot Temperature ; *Minor Planets ; Models, Theoretical
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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