Modal mineralogy of CI and CI-like chondrites by X-ray diffraction
نویسندگان
چکیده
منابع مشابه
Characterising the CI and CI-like carbonaceous chondrites using thermogravimetric analysis and infrared spectroscopy
The CI and CI-like chondrites provide a record of aqueous alteration in the early solar system. However, the CI-like chondrites differ in having also experienced a late stage period of thermal metamorphism. In order to constrain the nature and extent of the aqueous and thermal alteration, we have investigated the bulk mineralogy and abundance of H2O in the CI and CI-like chondrites using thermo...
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Existing reflectance spectra of CI chondrites (18 spectra of 3 CIs) have been augmented with new (18 spectra of 2 CIs) reflectance spectra to ascertain the spectral variability of this meteorite class and provide insights into their spectral properties as a function of grain size, composition, particle packing, and viewing geometry. Particle packing and viewing geometry effects have not previou...
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Hedgehog (Hh) proteins signal by inhibiting the proteolytic processing of Ci/Gli family transcription factors and by increasing Ci/Gli-specific activity. When Hh is absent, phosphorylation of Ci/Gli triggers binding to SCF ubiquitin ligase complexes and consequent proteolysis. Here we show that multiple successively phosphorylated CK1 sites on Ci create an atypical extended binding site for the...
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We present radio imaging observations of the 1998 outburst of the peculiar emission line star CICam, taken ∼1, 4, 75, 82, 93, 163, and 306 days after the beginning of the 31.64 March 1998 X-ray flare. The first two epochs show a resolved but compact (no larger than 12 milliarcseconds) radio source which becomes optically thin at frequencies higher than 5GHz. The spectrum and brightness temperat...
متن کاملPetrographic, 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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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2015
ISSN: 0016-7037
DOI: 10.1016/j.gca.2015.05.038