publication . Article . 1999

The Age of the Carbonates in Martian Meteorite ALH84001

Lars E. Borg; James N. Connelly; L. E. Nyquist; C.-Y. Shih; H. Wiesmann; Young Reese;
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  • Published: 01 Oct 1999
  • Publisher: American Association for the Advancement of Science (AAAS)
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 approximately 5 percent), whitlockite (trace), and orthopyroxene (approximately 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 b...
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free text keywords: Multidisciplinary, Carbonate, chemistry.chemical_compound, chemistry, Geology, Whitlockite, engineering.material, engineering, Isotopes of strontium, Martian, Isochron dating, Pyroxene, Meteorite, Mineralogy, Late Heavy Bombardment
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