2005
DOI: 10.1186/bf03351858
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Widespread magmatic activities on the angrite parent body at 4562 Ma ago

Abstract: Mn-Cr chronology of four quenched angrites showed that they formed nearly at the same time (4562 Ma) on the surface of the parent-body. Based on the chemical compositions, the cosmic ray exposure ages, and considerations on the thermal history of an achondrite parent-body, we suggest that the four angrites formed on top of a shallow magma ocean on the angrite parent body.

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Cited by 40 publications
(32 citation statements)
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“…The angrite parent body is, as far as we know, the only body capable of producing such unusual mineralogy and therefore of generating carbonated melts. Since angrites are among the oldest objects in the solar system (Baker et al 2005;Spivak-Birndorf et al 2005;Sugiura et al 2005;Markowski et al 2006), they might represent the remains of an early stage of planetoid evolution: having expelled their carbonates, planetoids would produce normal basaltic melts as observed on many planets and asteroids.…”
Section: Discussionmentioning
confidence: 99%
“…The angrite parent body is, as far as we know, the only body capable of producing such unusual mineralogy and therefore of generating carbonated melts. Since angrites are among the oldest objects in the solar system (Baker et al 2005;Spivak-Birndorf et al 2005;Sugiura et al 2005;Markowski et al 2006), they might represent the remains of an early stage of planetoid evolution: having expelled their carbonates, planetoids would produce normal basaltic melts as observed on many planets and asteroids.…”
Section: Discussionmentioning
confidence: 99%
“…This is not enough to separate 52 CrH ions from 53 Cr ions but the 52 CrH signal (which is practically undetectable during the mass calibration procedure) was always less than 1‰ of the 53 Cr signal. The relative sensitivity factor (Mn + /Cr + )/(Mn/Cr) = 1.62±0.12 (2σ error) was estimated based on measurements of a synthetic glass sample which has a composition similar to the Fe-rich olivine in R chondrites (Sugiura et al, 2005).…”
Section: Methodsmentioning
confidence: 99%
“…Most importantly, the rough consistency of these chronometers for multiple samples from differentiated parent bodies demonstrates their validity for studying early planetary differentiation processes. (Lugmair & Galer 1992;Amelin et al 2002Amelin et al , 2006Zartman et al 2006;Amelin 2007), Mn-Cr (Lugmair & Shukolyukov 1998;Glavin et al 2004;Sugiura et al 2005;Wadhwa et al 2005), Al-Mg (Lee et al 1977;Baker et al 2005;Spivak-Birndorf et al 2005;Wadhwa et al 2005) and Hf-W ages ( Yin et al 2002a;Kleine et al 2005a;Markowski et al 2007) for both old (D'Orbigny and Sahara 99555) and young angrites (LEW 86010, NWA 2999 and Angra dos Reis (ADOR)), two eucrites (Ibitira and Asuka 881394) and CAIs. To be fully consistent, all the samples should fit perfectly on lines with slopes identical to those in the diagrams (but not necessarily precisely in the position shown).…”
Section: (B ) Mixing and Transport In The Nebulamentioning
confidence: 99%