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• W2614522643 endingPage "27" @default.
• W2614522643 startingPage "8" @default.
• W2614522643 abstract "Variable proportions of isotopically diverse presolar components are known to account for nucleosynthetic isotopic anomalies for a variety of elements (e.g., Ca, Ti, Cr, Ni, Sr, Zr, Mo, Ru, Pd, Ba, Nd, and Sm) in both bulk chondrites and achondrites. However, although large Os isotopic anomalies have been measured in acid leachates and residues of unequilibrated chondrites, bulk chondrites of various groups, iron meteorites, and pallasites exhibit Os isotopic compositions that are indistinguishable from terrestrial or bulk solar isotopic abundances. Since the magnitude of nucleosynthetic anomalies is typically largest in the carbonaceous chondrites, this study reports high-precision Os isotopic compositions and highly siderophile element (HSE) concentrations for ten CK chondrites. The isotope dilution concentration data for HSE and high-precision Os isotope ratios were determined on the same digestion aliquots, to precisely correct for radiogenic contributions to 186Os and 187Os. While acid leached bulk unequilibrated carbonaceous chondrites show deficits of s-process Os components to the same extent as revealed by unequilibrated enstatite, ordinary, and Rumuruti chondrites, equilibrated bulk CK chondrites exhibit no resolvable Os isotopic anomalies. These observations support the idea that acid-resistant, carbon-rich presolar grains, such as silicon carbide (SiC) or graphite, are major carriers for nucleosynthetic isotopic anomalies of Os. The destruction of these presolar grains, which are omnipresent in unequilibrated meteorites, must have occurred during aqueous alteration and thermal metamorphism, early in the CK chondrite parent body history. The dispersal of CK chondrites along the IIIAB iron meteorite isochron on a 187Os/188Os versus 187Re/188Os diagram, with Re/Os ratios from 0.032 to 0.083, in combination with the observed redistribution of other HSE (e.g., Pt, Pd), highlights the influence of parent body processes, overprinted by effects of recent terrestrial alteration. Under the oxidizing conditions prevalent on the CK parent body, evident from high abundances of magnetite and limited Fe-Ni metal in CK chondrites, these parent body processes made all isotopically anomalous Os, originally hosted in reduced presolar grains, accessible. The absence of Os isotopic anomalies in ordinary, enstatite, and now also carbonaceous chondrites, implies that the carriers of s- and r-process Os must have been effectively homogenized across the region of chondrite formation, and possibly even the entire solar protoplanetary nebula, as suggested by the Os isotopic compositions of iron meteorites and non-anomalous ureilites. Except for a limited number of ureilites, the relative proportions of presolar s- and r-process carriers of Os (and other elements such as W) in chondrites, and most other planetary bodies, must have remained constant during all subsequent nebular and planetary processes, which appears not to have been the case for other siderophile elements, including Mo, Ru, and Pd. The existence of Mo, Ru, Pd and other siderophile element isotopic anomalies thus appears to be in part controlled by the chemical properties of these elements (e.g., volatility), their host phase(s) (e.g., SiC, graphite, metal, sulfides), and the nature of the nebular or planetary processes experienced in the early solar system." @default.
• W2614522643 created "2017-05-26" @default.
• W2614522643 creator A5012184972 @default.
• W2614522643 creator A5022283727 @default.
• W2614522643 creator A5062114510 @default.
• W2614522643 creator A5085877860 @default.
• W2614522643 date "2017-11-01" @default.
• W2614522643 modified "2023-09-30" @default.
• W2614522643 title "Osmium isotopic homogeneity in the CK carbonaceous chondrites" @default.
• W2614522643 cites W1021473995 @default.
• W2614522643 cites W1637599072 @default.
• W2614522643 cites W1966284297 @default.
• W2614522643 cites W1966498190 @default.
• W2614522643 cites W1971502541 @default.
• W2614522643 cites W1973752788 @default.
• W2614522643 cites W1976875638 @default.
• W2614522643 cites W1978084037 @default.
• W2614522643 cites W1980383181 @default.
• W2614522643 cites W1981218182 @default.
• W2614522643 cites W1982088950 @default.
• W2614522643 cites W1983852962 @default.
• W2614522643 cites W1985503792 @default.
• W2614522643 cites W1987074122 @default.
• W2614522643 cites W1987815098 @default.
• W2614522643 cites W1988659958 @default.
• W2614522643 cites W1992448982 @default.
• W2614522643 cites W1996771681 @default.
• W2614522643 cites W1997106497 @default.
• W2614522643 cites W1997125791 @default.
• W2614522643 cites W2000003317 @default.
• W2614522643 cites W2001595256 @default.
• W2614522643 cites W2001688319 @default.
• W2614522643 cites W2001989120 @default.
• W2614522643 cites W2005977448 @default.
• W2614522643 cites W2008352652 @default.
• W2614522643 cites W2009450324 @default.
• W2614522643 cites W2009760642 @default.
• W2614522643 cites W2010659865 @default.
• W2614522643 cites W2010711862 @default.
• W2614522643 cites W2012546466 @default.
• W2614522643 cites W2012870163 @default.
• W2614522643 cites W2014413587 @default.
• W2614522643 cites W2017732839 @default.
• W2614522643 cites W2024499644 @default.
• W2614522643 cites W2024703761 @default.
• W2614522643 cites W2025926975 @default.
• W2614522643 cites W2026743385 @default.
• W2614522643 cites W2028476972 @default.
• W2614522643 cites W2028966605 @default.
• W2614522643 cites W2029404009 @default.
• W2614522643 cites W2030512132 @default.
• W2614522643 cites W2031839367 @default.
• W2614522643 cites W2036765580 @default.
• W2614522643 cites W2037706908 @default.
• W2614522643 cites W2039640880 @default.
• W2614522643 cites W2040647854 @default.
• W2614522643 cites W2040839854 @default.
• W2614522643 cites W2041286186 @default.
• W2614522643 cites W2041550028 @default.
• W2614522643 cites W2049305700 @default.
• W2614522643 cites W2050046574 @default.
• W2614522643 cites W2050686103 @default.
• W2614522643 cites W2055655464 @default.
• W2614522643 cites W2056826009 @default.
• W2614522643 cites W2058832655 @default.
• W2614522643 cites W2059432209 @default.
• W2614522643 cites W2059750087 @default.
• W2614522643 cites W2061063686 @default.
• W2614522643 cites W2067974841 @default.
• W2614522643 cites W2068464003 @default.
• W2614522643 cites W2070039781 @default.
• W2614522643 cites W2075619956 @default.
• W2614522643 cites W2080655818 @default.
• W2614522643 cites W2082799074 @default.
• W2614522643 cites W2083992589 @default.
• W2614522643 cites W2085236573 @default.
• W2614522643 cites W2090184768 @default.
• W2614522643 cites W2096471541 @default.
• W2614522643 cites W2105884831 @default.
• W2614522643 cites W2111696176 @default.
• W2614522643 cites W2114093307 @default.
• W2614522643 cites W2117421889 @default.
• W2614522643 cites W2121284956 @default.
• W2614522643 cites W2128895710 @default.
• W2614522643 cites W2129243512 @default.
• W2614522643 cites W2132010223 @default.
• W2614522643 cites W2138040240 @default.
• W2614522643 cites W2138913699 @default.
• W2614522643 cites W2148915808 @default.
• W2614522643 cites W2155910935 @default.
• W2614522643 cites W2159364309 @default.
• W2614522643 cites W2164600753 @default.
• W2614522643 cites W2169646071 @default.
• W2614522643 cites W2171360066 @default.
• W2614522643 cites W2179354572 @default.
• W2614522643 cites W2187784282 @default.
• W2614522643 cites W2239141080 @default.
• W2614522643 cites W2241182820 @default.

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