Deuterium/hydrogen ratios in unequilibrated ordinary chondrites

Computer Science

Scientific paper

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Abundance, Chondrites, Deuterium, Hydrogen, Isotopic Enrichment, Meteoritic Composition, Chemical Composition, Nebulae, Solar System, Meteorites, Ordinary Chondrites, Deuterium, Hydrogen, Element Ratios, Data, Bishunpur Meteorite, Biotite Meteorite, Krymka Meteorite, Water, Semarkona Meteorite, Weston Meteorite, Enrichment, Pyrolysis, Abundance, Chainpur Meteorite, Experiments, Procedure, Isotopes, Analysis, Composition, Comparisons

Scientific paper

Major enrichments in deuterium (D) relative to terrestrial and proposed nebula compositions have been discerned by the examination of specific phases within various meteorite samples. High and variable D enrichments are reported in two of the most unequilibrated, or unmetamorphosed, type LL3 ordinary chondrites, Bishunpur and Semarkona. Water released from bulk unseparated material by pyrolysis has delta-D values of up to about 3000% relative to standard mean ocean water (SMOW), or an absolute D/H ratio of about 60,000. Because one of the highest D contents yet encountered for a solar system species has therefore been observed without considering a specific fraction of a sample, these meteorites (1) either contain a greater proportion of the D-rich phase first recognized in meteorite separates, or (2) a small fraction having an even higher D content resides within them.

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