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• W2975347736 endingPage "299" @default.
• W2975347736 startingPage "275" @default.
• W2975347736 abstract "Eucrites represent samples of mafic crust of the parent body, likely Vesta, and record a complex geologic history involving magmatism, metamorphism, impact processing, and metasomatism. For better understanding of the geologic history, we present combined 207Pb/206Pb and 40Ar/39Ar chronology of four basaltic eucrites showing distinct petrologic features: Agoult, an equilibrated eucrite with granulitic textures; Camel Donga, a brecciated equilibrated eucrite enriched in metallic iron; DaG 380, a partially equilibrated monomict eucrite; and NWA 049, a metasomatized polymict eucrite comprising mostly unequilibrated clasts. The 207Pb/206Pb dating in combination with the acid washing technique was applied to pyroxene-rich and plagioclase-rich fractions, while the 40Ar/39Ar dating was performed mainly on plagioclase grains using the laser incremental heating method. The Pb isotopic data for acid leaching residues are more radiogenic than those for acid washes, reflecting efficient removal of non-radiogenic Pb components by the acid washing. Among the residues, however, only those of the Agoult and Camel Donga plagioclase-rich fractions yielded isochrons, rather than errorchrons, with 207Pb/206Pb ages of 4532.39 ± 0.87 Ma and 4515.43 ± 0.42 Ma, respectively. The trace element systematics further suggest that these residues essentially represent contaminant oxide minerals such as ilmenite and chromite rather than plagioclase. On the other hand, the Ar isotopic data for Agoult and Camel Donga yielded plateau ages with weighted means of 4494 ± 9 Ma and 3749 ± 25 Ma, in contrast to those for DaG 380 and NWA 049 that did not return any plateau. The 207Pb/206Pb and 40Ar/39Ar ages of Agoult are interpreted to reflect the time of the U–Pb and K–Ar system closure during a prolonged thermal metamorphism. By combining the ages reported here and in the literature with the calculated closure temperatures, the cooling rate of Agoult is determined to be 11 ± 2 °C/Ma. This cooling rate corresponds to a burial depth of 10–20 km, indicating that granulitic eucrites were originally crystallized near the surface and were subsequently buried and metamorphosed. The ∼20 Ma younger 207Pb/206Pb ages of Camel Donga than Agoult are considered to reflect delayed burial metamorphism in the source region, whereas the plateau 40Ar/39Ar age would record the time of an impact causing brecciation and efficient Ar-degassing of the buried crust. Furthermore, the model 207Pb*/206Pb* dates calculated for acid-washed pyroxenes imply that the burial metamorphism of Agoult and DaG 380 were broadly contemporaneous and also that NWA 049 was metasomatized by fluids within the uppermost crust later than 4.4 Ga." @default.
• W2975347736 created "2019-10-03" @default.
• W2975347736 creator A5002710962 @default.
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• W2975347736 creator A5078270492 @default.
• W2975347736 date "2019-12-01" @default.
• W2975347736 modified "2023-10-03" @default.
• W2975347736 title "The geologic history of Vesta inferred from combined 207Pb/206Pb and 40Ar/39Ar chronology of basaltic eucrites" @default.
• W2975347736 cites W1711960402 @default.
• W2975347736 cites W1935527374 @default.
• W2975347736 cites W1964523361 @default.
• W2975347736 cites W1965369483 @default.
• W2975347736 cites W1970076158 @default.
• W2975347736 cites W1972399946 @default.
• W2975347736 cites W1975238108 @default.
• W2975347736 cites W1975440896 @default.
• W2975347736 cites W1976518189 @default.
• W2975347736 cites W1976850064 @default.
• W2975347736 cites W1977026092 @default.
• W2975347736 cites W1980065099 @default.
• W2975347736 cites W1981144837 @default.
• W2975347736 cites W1982097095 @default.
• W2975347736 cites W1983546658 @default.
• W2975347736 cites W1983814820 @default.
• W2975347736 cites W1986808576 @default.
• W2975347736 cites W1987331028 @default.
• W2975347736 cites W1993215779 @default.
• W2975347736 cites W1995937940 @default.
• W2975347736 cites W1996858864 @default.
• W2975347736 cites W1997151940 @default.
• W2975347736 cites W1997330871 @default.
• W2975347736 cites W1999621813 @default.
• W2975347736 cites W2002125549 @default.
• W2975347736 cites W2005067694 @default.
• W2975347736 cites W2007088773 @default.
• W2975347736 cites W2007105153 @default.
• W2975347736 cites W2007304116 @default.
• W2975347736 cites W2007580443 @default.
• W2975347736 cites W2010369657 @default.
• W2975347736 cites W201047755 @default.
• W2975347736 cites W2010785381 @default.
• W2975347736 cites W2010841002 @default.
• W2975347736 cites W2012122935 @default.
• W2975347736 cites W2012713626 @default.
• W2975347736 cites W2014301832 @default.
• W2975347736 cites W2020238915 @default.
• W2975347736 cites W2020799350 @default.
• W2975347736 cites W2021272292 @default.
• W2975347736 cites W2023543745 @default.
• W2975347736 cites W2024007016 @default.
• W2975347736 cites W2024058778 @default.
• W2975347736 cites W2027770816 @default.
• W2975347736 cites W2028130343 @default.
• W2975347736 cites W2028573084 @default.
• W2975347736 cites W2029013698 @default.
• W2975347736 cites W2032637116 @default.
• W2975347736 cites W2035283347 @default.
• W2975347736 cites W2035388653 @default.
• W2975347736 cites W2035443888 @default.
• W2975347736 cites W2037318095 @default.
• W2975347736 cites W2037503004 @default.
• W2975347736 cites W2038675436 @default.
• W2975347736 cites W2039326987 @default.
• W2975347736 cites W2041649524 @default.
• W2975347736 cites W2043725742 @default.
• W2975347736 cites W2044162879 @default.
• W2975347736 cites W2045370003 @default.
• W2975347736 cites W2045774015 @default.
• W2975347736 cites W2047067159 @default.
• W2975347736 cites W2049941277 @default.
• W2975347736 cites W2050070574 @default.
• W2975347736 cites W2050616445 @default.
• W2975347736 cites W2053381713 @default.
• W2975347736 cites W2059103150 @default.
• W2975347736 cites W2059653934 @default.
• W2975347736 cites W2060956521 @default.
• W2975347736 cites W2061159379 @default.
• W2975347736 cites W2062101014 @default.
• W2975347736 cites W2064201988 @default.
• W2975347736 cites W2065336190 @default.
• W2975347736 cites W2067062469 @default.
• W2975347736 cites W2067265470 @default.
• W2975347736 cites W2070544741 @default.
• W2975347736 cites W2070982661 @default.
• W2975347736 cites W2071563948 @default.
• W2975347736 cites W2073066596 @default.
• W2975347736 cites W2074326614 @default.
• W2975347736 cites W2076981031 @default.
• W2975347736 cites W2079975223 @default.
• W2975347736 cites W2080534840 @default.
• W2975347736 cites W2083042594 @default.
• W2975347736 cites W2084062931 @default.
• W2975347736 cites W2084614127 @default.
• W2975347736 cites W2085241101 @default.

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