Journal ArticleDOI
Correlated alteration effects in CM carbonaceous chondrites
TLDR
In this paper, three parameters are proposed to determine the relative extent of alteration in CM chondrites: the mineralogic alteration index monitors the relative progress of coupled substitutions in the progressive alteration of cronstedtite to Mg-serpentine and increases with increasing alteration.Citations
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Oxygen isotope studies of carbonaceous chondrites
TL;DR: In this paper, a comprehensive set of whole-rock analyses of CV, CO, CK, CM, CR, CH, and CI chondrites is presented, as well as selected components of some of these meteorites.
Systematics and Evaluation of Meteorite Classification
TL;DR: In this paper, meteorites are classified based on their mineralogical and petrographic characteristics and their whole-rock chemical and O-isotopic compositions according to the currently used classification scheme.
Journal ArticleDOI
Progressive aqueous alteration of CM carbonaceous chondrites
TL;DR: In this article, a numerical alteration sequence for CM chondrites is proposed, which is based on the existing scheme of Browning et al. The proposed sequence is more comprehensive and employs petrologic subtypes that are easier to use and remember than mineralogic index values.
Journal ArticleDOI
High molecular diversity of extraterrestrial organic matter in Murchison meteorite revealed 40 years after its fall
Philippe Schmitt-Kopplin,Zelimir Gabelica,Régis D. Gougeon,Agnes Fekete,Basem Kanawati,Mourad Harir,Istvan Gebefuegi,Gerhard Eckel,Norbert Hertkorn +8 more
TL;DR: It is demonstrated that a nontargeted ultrahigh-resolution molecular analysis of the solvent-accessible organic fraction of Murchison extracted under mild conditions allows one to extend its indigenous chemical diversity to tens of thousands of different molecular compositions and likely millions of diverse structures.
Journal ArticleDOI
Enrichment of the amino acid L-isovaline by aqueous alteration on CI and CM meteorite parent bodies.
TL;DR: The large asymmetry in isovaline and other α-dialkyl amino acids found in altered CI and CM meteorites suggests that amino acids delivered by asteroids, comets, and their fragments would have biased the Earth's prebiotic organic inventory with left-handed molecules before the origin of life.
References
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Journal ArticleDOI
Meteorites and the Early Solar System
TL;DR: Chondrite classification, primordial matter composition and early solar system chemical processes, discussing cosmic gas condensation and refractory element fractionation are discussed in this paper, with a focus on early solar systems chemical processes.
Journal ArticleDOI
A chemical-petrologic classification for the chondritic meteorites.
W. R. Van Schmus,John A. Wood +1 more
TL;DR: In this article, a two-dimensional classification grid based on chemical and petrologic subdivisions of chondritic meteorites is proposed, which extends the current chemical subdivisions to account for varying petrolic (implied metamorphic) properties within the primary chemical groups.
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Oxygen Isotopes in Meteorites
TL;DR: Among all the c he mic al e le men ts, ox ygen has a co mbin ation of pro pe rtie s tha t ma kes it u nique ly im por ta nt in cosmoc hem is tr y as mentioned in this paper.
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Early chemical history of the solar system
TL;DR: In this article, the sequence of condensation of mineral phases from a cooling nebula of solar composition has been calculated by using equilibrium thermodynamics, and theoretical models suggest that the chemistry and mineralogy of Ca-Al-rich inclusions in C2 and C3 chondrites were established during condensation at temperatures above 1300 K.
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A chart for judging the reliability of point counting results
L. v. d. Plas,A. C. Tobi +1 more
TL;DR: In this article, the reliability of point-counting results is based on twice the standard deviation of the point distance to the largest grain size included in the modal analysis, which is the same as in this paper.