Relative chronology of crust formation on asteroid Vesta: Insights from the geochemistry of diogenites

被引：88
作者：
Barrat, Jean-Alix [1 ,2 ]
Yamaguchi, Akira [3 ]
Zanda, Brigitte [4 ]
Bollinger, Claire [1 ,2 ]
Bohn, Marcel [1 ,2 ]
机构：
[1] Univ Brest, CNRS, UMR Domaines Ocean 6538, IUEM, F-29280 Plouzane, France
[2] Univ Europeenne Bretagne, Bretagne, France
[3] Natl Inst Polar Res, Antarctic Meteorites Res Ctr, Tokyo 1908518, Japan
[4] Museum Natl Hist Nat, CNRS, Lab Mineral & Cosmochim Museum, UMR 7202, F-75005 Paris, France
来源：
GEOCHIMICA ET COSMOCHIMICA ACTA | 2010年 / 74卷 / 21期
关键词：
TRACE-ELEMENT GEOCHEMISTRY; RARE-EARTH-ELEMENTS; OLIVINE DIOGENITES; EUCRITES; CONSTRAINTS; PETROLOGY; PETROGENESIS; SIDEROPHILE; TIMESCALES; HOWARDITE;
D O I：
10.1016/j.gca.2010.07.028
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The eucrites and diogenites are meteorites that probably originate from asteroid 4-Vesta. The upper part of the crust of this body is certainly composed of eucrites which are basaltic or gabbroic rocks. Diogenites are ultramafic cumulates whose relationships with eucritic lithologies are unknown. Here, we show that the orthopyroxenes of some diogenites display very deep negative Eu anomalies (Eu/Eu* close to 0.1 or lower). The contamination of the parental magmas of diogenites by melts derived by partial melting of the eucritic crust can satisfactorily explain the range of the Eu anomalies displayed by diogenites. Thus, these anomalies are the first firm indication that parental melts of diogenites have intruded the eucritic crust, and consequently are younger than eucrites. (C) 2010 Elsevier Ltd. All rights reserved.
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页码：6218 / 6231
页数：14
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