Formation of Carbonates in the Tatahouine Meteorite

Author:

Barrat J. A.1234,Gillet Ph.1234,Lécuyer C.1234,Sheppard S. M. F.1234,Lesourd M.1234

Affiliation:

1. J. A. Barrat, Université d'Angers, Laboratoire de Géologie, 2 Boulevard Lavoisier, 49045 Angers Cedex, France.

2. Ph. Gillet, Institut Universitaire de France, and Laboratoire de Sciences de la Terre, Centre National de la Recherche Scientifique UMR 5570, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 07, France.

3. C. Lécuyer and S. M. F. Sheppard, Laboratoire de Sciences de la Terre, Centre National de la Recherche Scientifique UMR 5570, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 07, France.

4. M. Lesourd, Centre National de la Recherche Scientifique et Service Commun de Microscopie Electronique, Faculté de Medecine, Rue Haute de Reculée, 49045 Angers Cedex, France.

Abstract

The Tatahouine meteorite, in southern Tunisia, shows terrestrial contamination that developed during 63 years of exposure on Earth's surface. Samples collected on the day of the fall in 1931 contained fractures, with no secondary minerals, whereas samples collected in 1994 contain calcite aggregates (70 to 150 micrometers) and rod-shaped forms (100 to 600 nanometers in length and 70 to 80 nanometers in diameter) on the fractures. Carbon isotope analysis of the carbonates within the Tatahouine meteorite [δ 13 C = −2.0 per mil Pee Dee belemnite standard (PDB)] and the underlying ground (δ 13 C = −3.2 per mil PDB) confirm their terrestrial origin.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference14 articles.

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5. Isotopic analyses were performed on CO 2 gas extracted by a H 3 PO 4 acid technique with a VG-PRISM mass spectrometer. For the fracture-filling sample three chips without coating (total weight 30 mg) with a few filled microfractures were selected and leached with H 3 PO 4 acid for 12 hours yielding about 0.3 μmol of CO 2 .

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