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Isotopic Fractionation of Zn During Impact on Earth

Frederic Moynier 1, 2, 3 Fred Jourdan 4 Qing-Zhu Yin 3 Pierre Beck 5 Christian Koeberl 6 Uwe Reimold 7
1 McDonnell Center for Space Sciences
2 Department of Earth and Planetary Sciences [St Louis]
3 Department of Geology [Davis]
4 Western Australian Argon Isotope Facility, Department of Applied Geology & JdL-CMS
5 LPG - Laboratoire de Planétologie de Grenoble
6 Department of Lithospheric Research [Wien]
7 Museum of Natural History (Mineralogy)
Abstract : The isotope fractionation of Zn in lunar soils [1] is surprisingly large (up to 3 per mil per amu). These fractionations have been attributed to vaporization due to impact by micrometeorites onto the surface of the moon. Recently, Albarede et al. [2] extended the study of isotopic fractionation of Zn to shocked rocks from a terrestrial impact site, Meteor Crater. They observed a negative correlation between isotope compositions and shock grade in 7 samples of Coconino sandstone and concluded that, even on Earth, vaporization at high temperature due to impact is capable to fractionate the isotopic compositions of rather heavy elements to a measurable extent. Here, we investigate the degree of isotopic fractionation of Zn in rocks from two terrestrial impact craters: (1) impactites from the Lonar crater, India, and (2) the impact melt rocks from the Bosumtwi crater (Ghana), as well as the related Ivory Coast tektites (IVC)
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https://hal-insu.archives-ouvertes.fr/insu-00365646
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Submitted on : Wednesday, March 4, 2009 - 8:21:32 AM
Last modification on : Tuesday, October 19, 2021 - 6:58:02 PM

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Frederic Moynier, Fred Jourdan, Qing-Zhu Yin, Pierre Beck, Christian Koeberl, et al.. Isotopic Fractionation of Zn During Impact on Earth. 39th Lunar and Planetary Science Conference, Mar 2008, League City, Texas, United States. pp.1426. ⟨insu-00365646⟩

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