Coupled organic synthesis and mineral alteration on meteorite parent bodies
نویسندگان
چکیده
منابع مشابه
Ar-ar Dating of Thermal Events on Meteorite Parent Bodies
Parent bodies of meteorites have experienced a variety of thermal events caused by early internal metamorphism and impact heating. Among radiometric chronometers, the 39 Ar-40 Ar technique is particularly sensitive to such thermal events. For over two decades the JSC laboratory has acquired 39 Ar-40 Ar data on a wide variety of meteorite types. The purpose here is to summarize some JSC data (an...
متن کاملEnrichment of the amino acid L-isovaline by aqueous alteration on CI and CM meteorite parent bodies.
The distribution and enantiomeric composition of the 5-carbon (C(5)) amino acids found in CI-, CM-, and CR-type carbonaceous meteorites were investigated by using liquid chromatography fluorescence detection/TOF-MS coupled with o-phthaldialdehyde/N-acetyl-L-cysteine derivatization. A large L-enantiomeric excess (ee) of the alpha-methyl amino acid isovaline was found in the CM meteorite Murchiso...
متن کاملEnrichment of L-isovaline by Aqueous Alteration on Ci and Cm Meteorite Parent
Introduction: The finding of slight to significant enanti-omeric excesses for several indigenous amino acids in the Mur-chison and Murray CM-type meteorites [1-3] could point toward an exogenous origin of biological homochirality on the early Earth. UV circularly polarized light (UV-CPL) in the presolar cloud has been proposed as one possible source of the initial amino acid symmetry [4]. Howev...
متن کاملDid organic compounds in the Tagish Lake meteorite form via catalytic processes in the solar nebula and within parent bodies?
METEORITE FORM VIA CATALYTIC PROCESSES IN THE SOLAR NEBULA AND WITHIN PARENT BODIES? H. G. M. Hill, I. Gilmour, V. K. Pearson and J. A. Nuth, International Space University, Strasbourg Central Campus, 67400 Illkirch-Graffenstaden, France ([email protected]), Planetary and Space Sciences Research Institute, The Open University, Milton Keynes MK7 6AA, U.K. ([email protected]), Code 691, NASA...
متن کاملA Thermodynamic Basis for Extensive Intermediate Temperature Vapor Phase Transport on Meteorite Parent Bodies
Introduction: Compelling observational evidence for extensive vapor phase transport on the Allende parent body has been in the literature for many years [1]. This evidence includes 1) widespread observations of disequilibrium Fe-rich olivine on surfaces and in internal cracks in MgSiO4, 2) widespread occurrences of isolated grains of low temperature pentlandite in the matrix, and 3) vesicle-lik...
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ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2004
ISSN: 1086-9379,1945-5100
DOI: 10.1111/j.1945-5100.2004.tb00128.x