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The Age of the Carbonates in Martian Meteorite ALH84001

descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 1999Publisher:American Association for the Advancement of Science (AAAS)Journal:Science, volume 286, pages 90-94 (issn: 0036-8075, eissn: 1095-9203,

Authors: Connelly, J. N.; Nyquist, L. E.; Cy, Shih; Wiesmann, H.; Reese, Y.; Borg, L. E.;

doi: 10.1126/science.286.5437.90

pmid: 10506566

The Age of the Carbonates in Martian Meteorite ALH84001

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Abstract

The age of secondary carbonate mineralization in the martian meteorite ALH84001 was determined to be 3.90 ± 0.04 billion years by rubidium-strontium (Rb-Sr) dating and 4.04 ± 0.10 billion years by lead-lead (Pb-Pb) dating. The Rb-Sr and Pb-Pb isochrons are defined by leachates of a mixture of high-graded carbonate (visually estimated as ∼5 percent), whitlockite (trace), and orthopyroxene (∼95 percent). The carbonate formation age is contemporaneous with a period in martian history when the surface is thought to have had flowing water, but also was undergoing heavy bombardment by meteorites. Therefore, this age does not distinguish between aqueous and impact origins for the carbonates.

Related Organizations

The University of Texas at Austin
United States

Keywords

Calcium Phosphates, Minerals, Iron, Carbonates, Mars, Meteoroids, Strontium Isotopes, Isotopes, Lead, Calcium, Magnesium, Rubidium Radioisotopes

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