SR and Nd isotopic systematics in ALHA 77005 - Age of shock metamorphism in shergottites and magmatic differentiation on Mars

Details SR and Nd isotopic systematics in ALHA 77005 - Age of shock metamorphism in shergottites and magmatic differentiation on Mars SR and Nd isotopic systematics in ALHA 77005 - Age of shock metamorphism in shergottites and magmatic differentiation on Mars

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2429j&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Sept. 1989, p. 2429-2441.

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22

Magma, Mars (Planet), Meteoritic Composition, Neodymium Isotopes, Strontium Isotopes, Chondrites, Metamorphism (Geology), Petrography, Planetary Composition, Temperature Distribution, Meteorites, Strontium, Neodymium, Isotopes, Systematics, Alh Meteorites, Alha77005, Antarctic Meteorites, Samples, Meteorite, Laboratory Studies, Shock Effects, Metamorphism, Age, Shergottites, Mars, Differentiation, Magma, Snc Meteorites, Petrography, Parent Material, Origin, Source, Procedure, Photomicrographs, Trace Element

Scientific paper

This paper presents new Sr and Nd isotopic data for the whole rock and petrographically distinct mineral separates of the ALHA 77005 meteorite, considered to be a fragment of Mars. The Rb/Sr fractionation data on plagioclase identify the shock age of ALHA 77005 as 15 + or - 15 Ma, i.e., being identical, within error, to the exposure age of 2.5 Ma. The coincidence of these ages removes the necessity for the scenario proposed by Bogard et al. (1984), in which the shergottites are assumed to be ejected from Mars 180 ago as a single fragment with a diameter of more than 6 m, which broke up in space at 2.5 Ma. On the other hand, it renews the question of the nature of the 160 Ma isotopic signature observed in shergottites, which is discussed on the basis of data on various mineral separates from ALHA 77005.

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