Mineralogy, chemistry, and composition of organic compounds in the fresh carbonaceous chondrite Mukundpura: CM1 or CM2?

1S. Potin,1P. Beck,1L. Bonal,1B. Schmitt,2A. Garenne,3F. Moynier,4A. Agranier,5,6P. Schmitt‐Kopplin,7A. K. Malik,1E. Quirico
Meteoritics & Planetary Science (in Press) Link to Article [https://doi.org/10.1111/maps.13540]
1Institut de Planétologie et d’Astrophysique de Grenoble IPAG, Université Grenoble Alpes, CNRS, 414 rue de la Piscine, 38400 Saint‐Martin d’Hères, France
2Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California, 94550 USA
3Institut de Physique du Globe de Paris, Université de Paris, CNRS, 1 rue Jussieu, 75005 Paris, France
4Laboratoire Géosciences Océan, UMR/CNRS 6538, IUEM, Université de Bretagne Occidentale, Technopôle Brest‐Iroise, Rue Dumont d’Urville, 29280 Plouzané, France
5Helmholtz Zentrum Muenchen, Research Unit Environmental Simulation (EUS) Ingolstaedter Landstrasse 1, 85764 Neuherberg, Germany
6Lehrstuhl für Analytische Lebensmittechemie, Technische Universität München, Maximus‐von‐Imhof‐Forum 2, 85354 Freising, Germany
7Department of Chemistry, Punjabi University, Patiala, 147 002 Punjab, India
Published by arrangement with John Wiley & Sons

We present here several laboratory analyses performed on the freshly fallen Mukundpura CM chondrite. Results of infrared transmission spectroscopy, thermogravimetry analysis, and reflectance spectroscopy show that Mukundpura is mainly composed of phyllosilicates. The rare earth trace elements composition and ultrahigh‐resolution mass spectrometry of the soluble organic matter give results consistent with CM chondrites. Finally, Raman spectroscopy shows no signs of thermal alteration of the meteorite. All the results agree that Mukundpura has been strongly altered by water on its parent body. Comparison of the results obtained on the meteorite with those of other chondrites of known petrologic types leads to the conclusion that Mukundpura is similar to CM1 chondrites, which differ from its original classification as a CM2.

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