南极GRV 024237橄辉无球粒陨石的岩石矿物学特征
PETROLOGY AND MINERALOGY OF THE GROVE MOUNTAINS(GRV) 024237 UREILITE FROM ANTARCTICA
查看参考文献31篇
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文摘
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GRV024237是第19次中国南极科学考察队在南极格罗夫山地区一号冰碛上发现的.主要由粗粒状橄榄石(60vol%),易变辉石(30vol%)和不透明矿物(10vol%)组成,粗粒橄榄石辉石,颗粒边界呈120°接触角,无球粒,粗粒橄榄石具有明显的反环带结构,这些特征符合典型的橄辉无球粒陨石结构.薄片中橄榄石颗粒的边部到核部化学组成变化显著,边部富镁, Fa6.2—Fa17.5;易变辉石组成比较均一, Fs14.0—Fs15.5;基质不透明矿物富含碳质,充填于大颗粒的间隙及裂隙.岩石学和矿物化学组成两方面都表明GRV024237是一块橄辉无球粒陨石,且属于I型单矿角砾岩,中等FeO/MgO比值,冲击程度较弱,经历了部分熔融 |
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其他语种文摘
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GRV 024237 was found at the No. 4 moraine, Grove Mountains, Antarctica,in the 19th Chinese Antarctic Research Expedition (CHINARE). GRV 024237 consists of granular assemblage of olivine (60 vol%), pigeonite (30 vol%), the grain boundaries are black and filled by opaque minerals (10 vol%), and 120° junctions are common. The chemical compositions of olivine are obviously zonal distribution. The values of olivine Fa are varied between 6. 2 and 16. 77 from the grain's rim to core. However, the Fs of pigeonite are quite homogenous, which are between 14. 0 and 15. 5. The opaque minerals are black carbonaceous material, troilite and Fe-Ni metal. Based on our study,GRV024237 is a monomict ureilite, which is suffered light shock metamorphism and experienced partial melting |
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来源
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极地研究
,2010,22(4):375-385 【核心库】
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关键词
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南极陨石
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橄辉无球粒陨石
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分类
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成因
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地址
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1.
中国科学院研究生院, 中国科学院同位素年代学和地球化学重点实验室, 广州, 510640
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中国科学院广州地球化学研究所, 中国科学院同位素年代学和地球化学重点实验室, 广州, 510640
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桂林理工大学, 广西地质工程中心重点实验室, 桂林, 541004
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-7073 |
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学科
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天文学 |
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基金
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中国科学院知识创新工程重要方向项目
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国家自然科学基金项目
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国家科技基础条件平台建设项目
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国际极地年中国行动计划项目资助
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文献收藏号
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CSCD:4099836
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参考文献 共
31
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