Aqueous Alteration of Carbonaceous Chondrites: Evidence for Asteroidal
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منابع مشابه
The Role of Microchemical Environments in the Alteration of Cm Carbonaceous Chondrites
Introduction: Aqueous fluids have left their fingerprint on almost all the known chondrite groups and attest to the fact that water was a widespread agent of change in the early solar system [1,2]. The interaction of liquid or gaseous water with the primary products of nebular processes caused significant textural, mineralogical, compositional and isotopic changes that are often very complex to...
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The larger portion of the organic carbon in carbonaceous chondrites (CC) is present as a complex and heterogeneous macromolecular material that is insoluble in acids and most solvents (IOM). So far, it has been analyzed only as a whole by microcopy (TEM) and spectroscopy (IR, NMR, EPR), which have offered and overview of its chemical nature, bonding, and functional group composition (e. g., [1]...
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Linear saturated dicarboxylic acids are present in carbonaceous chondrite samples at concentrations that suggest aqueous alteration under conditions of metastable equilibrium. In this study, previously published values of dicarboxylic acid concentrations measured in Murchison, Yamato-791198, and Tagish Lake carbonaceous chondrites are converted to aqueous activities during aqueous alteration as...
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Figure 1. Stability fields of sulfate and bisulfide at a total pressure of 100 bar. The thin solid curves represent equal activities of SO4 and HS at various pH. The QFM curve represents equilibrium (2) and HM stands for hematitemagnetite buffer. Sulfate is stable at higher temperature and lower ƒH2. Low-temperature formation of sulfate in asteroidal environments requires complete oxidation of ...
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