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Bulk Chemical Composition of the Ningqiang Carbonaceous Chondrite:An Issue of Classification

查看全文 作　　者：WANG [1,2]Guiqin;LIN [1,3]Yangting 高影响力作者 机构地区：[1]Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640;[2]Graduate School, Chinese Academy of Sciences, Beijing 100049;[3]State Key Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2007年第81卷第1期,共7页高影响力期刊 基　　金：This study was supported by the National Natural Science Foundation (Grant 40473038). 摘　　要：The Ningqiang meteorite is a fall carbonaceous chondrite, containing various Ca-, Al-rich inclusions that usually escaped from secondary events such as high-temperature heating and low- temperature alteration. However, it has not yet been classified into any known chemical group. In order to address this issue, 41 elements of the bulk Ningqiang meteorite were analyzed using inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma atom emission spectrometry (ICP-AES) in this study. The Allende (CV3) carbonaceous chondrite and the Jilin (H5) ordinary chondrite were also measured as references, and our analyses are consistent with the previous results. Rare earth and other refractory lithophile elements are depleted in Ningqiang relative to both Allende and mean CK chondrites. In addition, the REE pattern of Ningqiang is nearly flat, while that of Allende shows slight enrichment of LREE relative to HREE. Siderophile elements of Ningqiang are close to those of mean CK chondrites, but lower than those of Allende. Our new analyses indicate that Ningqiang cannot be classified into any known group of carbonaceous chondrites, consistent with previous reports. 关 键 词：球粒状陨石 高温加热 碳质 矿物组成
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