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Identification of a meteoritic component using chromium isotopic composition of impact rocks from the Lonar impact structure, India

Bérengère Mougel 1, 2 Frédéric Moynier 3, 2 Christian Koeberl 4, 5 Daniel Wielandt 6 Martin Bizzarro 7
1 Univ Nacl Autonoma Mexico, Ctr Geociencias, Blvd Juriquilla 3001, Queretaro 76230, Mexico
2 IPGP - Institut de Physique du Globe de Paris
3 Inst Univ France, 1 Rue Descartes, F-75231 Paris 05, France
4 Department of Lithospheric Research [Wien]
5 Nat Hist Museum, Burgring 7, A-1010 Vienna, Austria
6 Centre for Star and Planet Formation [Copenhagen]
7 Natural History Museum of Denmark
Abstract : The existence of mass-independent chromium isotope variability of nucleosynthetic origin in meteorites and their components provides a means to investigate potential genetic relationship between meteorites and planetary bodies. Moreover, chromium abundances are depleted in most surficial terrestrial rocks relative to chondrites such that Cr isotopes are a powerful tool to detect the contribution of various types of extra-terrestrial material in terrestrial impactites. This approach can thus be used to constrain the nature of the bolide resulting in breccia and melt rocks in terrestrial impact structures. Here, we report the Cr isotope composition of impact rocks from the ~0.57 Ma Lonar crater (India), which is the best-preserved impact structure excavated in basaltic target rocks. Results confirm the presence of a chondritic component in several bulk rock samples of up to 3%. The impactor that created the Lonar crater had a composition that was most likely similar to that of carbonaceous chondrites, possibly a CM-type chondrite.
Keywords : KeyWords Plus:TARGET ROCKS MELT ROCKS CRATER GLASSES GEOCHEMISTRY TERRESTRIAL PETROGRAPHY SYSTEMATICS PROJECTILES INSIGHTS
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Submitted on : Tuesday, August 18, 2020 - 9:53:52 AM
Last modification on : Tuesday, October 19, 2021 - 7:01:51 PM

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INSU | CNRS | UNIV-PARIS | AFRIQ | IPGP | USPC

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Bérengère Mougel, Frédéric Moynier, Christian Koeberl, Daniel Wielandt, Martin Bizzarro. Identification of a meteoritic component using chromium isotopic composition of impact rocks from the Lonar impact structure, India. Meteoritics and Planetary Science, Wiley, 2018, 54 (10), pp.2592-2599. ⟨10.1111/maps.13312⟩. ⟨insu-02916850⟩

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