Bulk Chemical Composition of the Ningqiang Carbonaceous Chondrite: An Issue of Classification |
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作者姓名: | WANG Guiqin LIN Yangting |
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作者单位: | [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 |
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基金项目: | We thank Liu Ying, Hu Guangqian and Tu Xianglin for their helps during the experiments. This study was supported by the National Natural Science Foundation (Grant 40473038). |
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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.
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关 键 词: | 球粒状陨石 高温加热 碳质 矿物组成 |
收稿时间: | 2/9/2006 12:00:00 AM |
修稿时间: | 2006-06-19 |
Bulk Chemical Composition of the Ningqiang Carbonaceous Chondrite:An Issue of Classification |
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Authors: | WANG Guiqin and LIN Yangting Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong Graduate School Chinese Academy of Sciences Beijing State Key Laboratory of Lithosphere Tectonic Evolution |
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Institution: | WANG Guiqin,and LIN Yangting,Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong Graduate School,Chinese Academy of Sciences,Beijing State Key Laboratory of Lithosphere Tectonic Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing |
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Abstract: | 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. |
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Keywords: | meteorite carbonaceous chondrite classification bulk composition ICP-MS |
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