[1]卜国民,李华启,李文铅.2005.新疆塔克札勒蛇绿混杂岩中玄武质熔岩地球化学特征及其成因讨论.大地构造与成矿学,29(2):252-261.
 BU Guomin,LI Huaqi,LI Wenqian.2005.GEOCHEMICAL CHARACTERISTICS AND TECTONIC SETTINGS FOR BASALTS IN TAKEZHALE OPHIOLITE IN EAST JUNGGAR, XINJIANG.Geotectonica et Metallogenia,29(2):252-261.
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新疆塔克札勒蛇绿混杂岩中玄武质熔岩地球化学特征及其成因讨论
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2005年29卷02期
页码:
252-261
栏目:
出版日期:
2005-05-25

文章信息/Info

Title:
GEOCHEMICAL CHARACTERISTICS AND TECTONIC SETTINGS FOR BASALTS IN TAKEZHALE OPHIOLITE IN EAST JUNGGAR, XINJIANG
作者:
卜国民1李华启1李文铅1俞亨祥2金辉3
1.中国科学院广州地球化学研究所与南海海洋研究所 边缘海地质重点实验室,广东 广州510640 ;2.桂林工学院,广西 桂林 510004; 3.河南省地质矿产勘查与开发局第二地质勘查院,河南 许昌 416000
Author(s):
BU Guomin1 LI Huaqi1 LI Wenqian1 YU Hengxiang2 and JIN Hui3
1. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry and South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, GD 510640, China; 2. Guilin Institute of Technology, Guilin, GX 510004, China; 3.The 2th Exploration Institute of Henan Provincial Bureau of Geominerals Exploration and Development, Henan 416000, China
关键词:
蛇绿混杂岩 地球化学 弧前环境 塔克札勒
Keywords:
ophiolite geochemistry fore-arc tectono-environment Takezhale
分类号:
P595;P588.14+5
文献标志码:
A
摘要:
塔克札勒蛇绿混杂岩玄武岩的SiO2和MgO高,同时较富集Cr、Ni及Co等过渡族元素,具有玻安岩特征;微量元素以富集LILE(Ba,Rb,Sr 等)而亏损HFSE (Nb、Ta、Zr、Hf 等)为特征;该玄武岩具LREE平坦或弱亏损、HREE亏损的分配型式;构造环境判别图解指示该玄武岩形成于弧前环境。地球化学特征与其它地质特征表明该蛇绿岩代表了古亚洲洋消亡过程中的洋壳残片。
Abstract:
The basalts in Takezhale ophiolitic mélange show the characteristics of boninite, i.e., being characterized by high SiO2, MgO and enrichment in transition elements such as Cr, Ni and Co etc. The spider diagram for trace elements indicates that they are enriched in LILE (Ba, Rb, Sr etc.) but are depleted in HFSE (Nb, Ta, Zr, Hf etc.). The REE distributions show flat LREE trends but HREE-depleted patterns. Discrimination diagrams demonstrate that the basalts were formed in forearc in terms of tectono-environment. Geochemical and other geological features suggest that the ophiolitic mélange represents the ocean crust tags resulted from the withering away of the Palaeo-Asian ocean.

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备注/Memo

备注/Memo:
收稿日期:2004-03-01;改回日期:2004-11-04基金项目:国家重点基础研究发展规划项目(2001CB409805)和中科院创新重要方向性项目(KZCX3-SW-137)共同资助.作者简介:卜国民(1978-),男,硕士研究生,构造地球化学专业. E-mail:bgming@163.com
更新日期/Last Update: 2005-05-15