Post-hydration thermal metamorphism of carbonaceous chondrites
نویسندگان
چکیده
منابع مشابه
Petrographic, chemical and spectroscopic evidence for thermal metamorphism in carbonaceous chondrites I: CI and CM chondrites
We present a comprehensive description of petrologic, chemical and spectroscopic features of thermally metamorphosed CI-like and CM (and CM-like) chondrites. Only two such CI chondrites have so far been discovered i.e. Y-86029 and Y82162. Thermal metamorphism in these chondrites is apparent in their low contents of H2O, C and the most thermally labile trace elements, partial dehydration of matr...
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Introduction: CM carbonaceous chondrites have been constituent materials of hydrated planetesimals in the early solar system. They consist mainly of hydrous minerals as a result of extensive aqueous alteration. At a certain period after the aqueous alteration, many CM chondrites have been heated to higher temperature [e.g., 1], which caused evaporation loss of highly volatile elements [2] and d...
متن کاملCarbonaceous Nanospheres in Chondrites
Introduction: In the 1960s, prior to the widespread use of TEMs, several papers described rounded, micron-sized organic particles from carbonaceous chondrite (CC) meteorites [1-3]. Some of these particles were hollow. Except for two early TEM studies [4, 5], the rounded structures were essentially neglected until similar material was discovered in the Tagish Lake meteorite [6]. We subsequently ...
متن کاملSpectral reflectance properties of carbonaceous chondrites: 3. CR chondrites
Powdered samples of a suite of 14 CR and CR-like chondrites, ranging from petrologic grade 1 to 3, were spectrally characterized over the 0.3–2.5 lm interval as part of a larger study of carbonaceous chondrite reflectance spectra. Spectral analysis was complicated by absorption bands due to Fe oxyhydroxides near 0.9 lm, resulting from terrestrial weathering. This absorption feature masks expect...
متن کاملSpectral reflectance properties of carbonaceous chondrites: 7. CK chondrites
The reflectance spectra of 15 CK chondrites have been measured as part of an ongoing study of carbonaceous chondrite reflectance spectra. The available sample suite includes multiple grain sizes and samples with petrologic grades varying from CK4 to CK6. CK reflectance spectra are all characterized by an olivineassociated absorption band in the 1.05 lm region. Compared to pure olivine, CK spect...
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ژورنال
عنوان ژورنال: Journal of Mineralogical and Petrological Sciences
سال: 2005
ISSN: 1345-6296,1349-3825
DOI: 10.2465/jmps.100.260