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Shock‐induced isotope evolution of hydrogen and carbon in meteorites
Author(s) -
Mimura Koichi,
Okamoto Michioki,
Nakatsuka Takeshi,
Sugitani Kenichiro,
Abe Osamu
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl023050
Subject(s) - murchison meteorite , meteorite , isotope , dehydrogenation , astrobiology , isotope fractionation , carbonaceous chondrite , isotopes of carbon , chondrite , hydrogen , fractionation , kinetic isotope effect , stable isotope ratio , cosmochemistry , geology , radiochemistry , chemistry , deuterium , atomic physics , physics , nuclear physics , organic chemistry , catalysis
Single‐ and multiple‐shock recovery experiments on Murchison meteorite samples were performed, to examine the shock‐induced isotope behavior of their hydrogen and carbon contents. δD values of the shocked Murchison showed an initial increase from +10.6‰ to +59.1‰ before declining to −87.6‰, as the dehydrogenation progressed. Isotope behavior of δD can be controlled by dehydrogenation involving extremely large isotope fractionation and is attributed to the composition of organic matter in the Murchison. On the other hand, the behavior of δ 13 C simply decreased from −5.15‰ to −17.65‰ and is explainable by decarbonization only. The plot of those isotope data collected along devolatilization shows a variation curve that suggests the evolution of those isotopes in the meteorites. Shock is one of the processes effectively controlling the isotope features of the solar system.