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地球科学进展
岩石地球化学     
新疆科克森套蛇绿岩套玄武岩的地质地球化学
王玉往1,2,王京彬1,2,唐萍芝1,赵路通2,石 煜3,陈言飞3
1.北京矿产地质研究院,北京 100012;
2.昆明理工大学国土资源工程学院,云南 昆明 650093;
3.中国地质大学,北京 100083
Geology and Geochemistry of Basalt in the Kekesentao Ophiolite, Xinjiang
Wang Yuwang1,2, Wang Jingbin1,2, Tang Pingzhi1, Zhao Lutong2, Shi Yu3, Chen Yanfei3
1.Beijing Institute of Geology for Mineral Resources, Beijing 100012, China;
2.Faculty of Land Resource Engineering, Kunming University of Science and technology, Kunming 650093,China;
3.China University of Geosciences, Beijing 100083, China
 全文: PDF(2030 KB)  
摘要:

新疆北部科克森套地区玄武岩出露于超镁铁质岩体的北侧,与玄武质凝灰岩共生,厚度达50~80 m;玄武岩普遍具有片理化、斑状结构;岩石地球化学特征表明,该玄武岩属低碱(Na2O+K2O均<3%,σ值在0.60~1.19)、低钛(TiO2在0.73%~1.22%)、富镁(MgO在7.43%~9.72%)的拉斑玄武岩系列,具有原始岩浆特征(其Mg#值在0.65~0.71),稀土总量较低(ΣREE在29.68×10-6~44.91×10-6),稀土及微量元素配分曲线平缓,可能形成于洋中脊构造环境。该区玄武岩的发现和岩石地球化学研究,佐证了科克森套蛇绿岩套的存在。

关键词: 蛇绿岩地球化学缝合带科克森套新疆北部    
Abstract:

The newlyfound Kekesentao basalt occures in the north of the Kekesentao ultramafic complex, north Xinjiang. It is composed of basalt and basaltic tuff with thickness of 50 to 80 meters. The basalt generally undergoes schistosition, but porphyritic structure still remained. The geochemistry of rocks shows that the basalt is low alkali (Na2O+K2O<3%, σ=0.60-1.19), low titanium (TiO2=0.73%-1.22%) and magnesiumrich (MgO=7.43%-9.72%) tholeiitic rock series, and might be generated from primary magma characterized by Mg# value of 0.65 to 0.71. The characteristics of low REE contents (ΣREE=29.68×10-6-44.91×10-6), and flat REE and trace elements normalized pattern of the basalt suggest that it form in middleocean ridge tectonic setting. The discovery and geochemical research of the basalt proves the existence of Kekesentao ophiolite suite.

收稿日期: 2012-07-24 出版日期: 2012-10-10
:  P588.34  
基金资助:

国家重点基础研究发展计划项目“后碰撞过程壳幔物质交换与成矿”(编号:2007CB411304);全国危机矿山找矿专项“危机矿山勘查理论、方法与总结项目”(编号:200699105)资助.

作者简介: 王玉往(1965-),男,河北深县人,研究员,主要从事矿床学与矿床地球化学、火成岩岩石学研究.E-mail:wyw@cnncm.com
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引用本文:

王玉往,王京彬,唐萍芝,赵路通,石 煜,陈言飞. 新疆科克森套蛇绿岩套玄武岩的地质地球化学[J]. 地球科学进展, 10.11867/j.issn.1001-8166.2012.10.1100.

Wang Yuwang,Wang Jingbin, Tang Pingzhi, Zhao Lutong, Shi Yu, Chen Yanfei. Geology and Geochemistry of Basalt in the Kekesentao Ophiolite, Xinjiang. Advances in Earth Science, 10.11867/j.issn.1001-8166.2012.10.1100.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2012.10.1100        http://www.adearth.ac.cn/CN/Y2012/V27/I10/1100

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