Early evolution of Martian volatiles: Nitrogen and noble gas components in ALH84001 and Chassigny
作者： K. J. Mathew , K. Marti
DOI: 10.1029/2000JE001255
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摘要: Studies on SNC meteorites have permitted the characterization of modern Martian atmospheric components as well indigenous nitrogen and solar-type xenon. New isotopic elemental abundances noble gases in ALH84001 Chassigny provide important constraints early evolution planet. A primitive solar Xe component (Chass-S) an evolved (Chass-E), augmented with fission are identified Chassigny. Both represent interior reservoirs Mars characterized by low 129Xe/132Xe ( 130, respectively. Light (δ15N = −30‰) is associated Chass-S enriched melt inclusions olivine. An ancient (presumably incorporated ∼4 Gyr ago) has following signatures: 2.16, 36Ar/38Ar ≥ 5.0, 36Ar/132Xe ∼50, 84Kr/132Xe ∼6, δ15N 7‰. The trapped not isotopically fractionated. We observe major shifts signatures due to cosmogenic N both ALH84001. heavy comparable magnitude (δ15N>150‰) previously been interpreted (heavy) N. In situ produced components, 244Pu 238U Chassigny, identified. data strongly constrain exchanges reservoirs. retained abundant this may account for observed atmosphere. Chronometric information regarding atmosphere can be secured from relative radiogenic Xe, ∼80% 129Xer ratio ago.
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