Aqueous Oxidation of Parent Bodies of Carbonaceous Chondrites and Galilean Satellites Driven by Hydrogen
نویسندگان
چکیده
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 magnetite and is unlikely (see also [10]). AQUEOUS OXIDATION OF PARENT BODIES OF CARBONACEOUS CHONDRITES AND GALILEAN SATELLITES DRIVEN BY HYDROGEN ESCAPE. M. Yu. Zolotov and E. L. Shock, Department of Geological Sciences, Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, emails: [email protected], [email protected].
منابع مشابه
Formation of Sulfates on Parent Bodies of Carbonaceous Chondrites, Ceres,
Introduction: Chemical compounds of S 6+ , sulfates and/or SO3, occur on Earth, Venus, Mars, parent bodies of carbonaceous chondrites, and icy surfaces of Europa and Ganymede. On the terrestrial planets, formation of S 6+ species is related to atmospheric photochemical processes that produce O2 and other O-rich oxidants. Here we explain the formation of sulfates within chondritic bodies through...
متن کاملMetastable equilibria among dicarboxylic acids and the oxidation state during aqueous alteration on the CM2 chondrite parent body
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...
متن کاملOrganic Constituents in Carbonaceous Chondrites; Evidence for Preservation of Pristine Particles of Mixed Origins
Introduction: Carbonaceous chondrites are primitive meteorites that have sampled the oldest conden-sates of the solar system. They have accreted components of various origins: CAIs (also known as refrac-tory inclusions), chondrules, ice, noble gases and or-ganics. Radioactive decay of short lived radionucleides quickly heated these parent bodies and drove thermal metamorphism and aqueous altera...
متن کاملThe hydrology of carbonaceous chondrite parent bodies and the evolution of planet progenitors
Oxygen isotope ratio data from carbonaceous chondrites are explained if aqueous fluids flowed from high to low temperatures within the parent objects of these primitive meteorites. Recognition of ancient hydrological activity on primitive asteroid precursors affords a new class of constraints on the heat sources (ages?) and sizes of planet precursors in the early Solar System based on the geolo...
متن کاملHydrogen Chloride as a Source of Acid Fluids in Parent Bodies of Chondrites
Introduction: Chondrites reveal signs of aqueous alteration on their parent bodies [1-4] that occurred under a broad range of pH. The dominance of secondary Mg-phyllosilicates (saponite, serpentine, chlorite) in pervasively altered CI and CM chondrites [1-4] suggests alkaline conditions during deposition [5,6]. However, localized occurrences of phosphates and carbonates in CM carbonaceous chond...
متن کامل