| 新疆库米什北超基性岩发现及大地构造意义 |
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| 引用本文： | 冯晓强,张占武,李维军,韩湘涛,李怀敏.新疆库米什北超基性岩发现及大地构造意义[J].新疆地质,2012,30(2):136-140. |
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| 作者姓名： | 冯晓强 张占武 李维军 韩湘涛 李怀敏 |
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| 作者单位： | 1. 陕西省地矿局区域地质矿产研究院,陕西 咸阳 712000;中国地质大学(北京),北京 100083
2. 陕西省地矿局区域地质矿产研究院,陕西 咸阳,712000 |
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| 摘 要： | 新疆库米什北超基性岩的发现,为中天山南缘长阿吾子-古洛沟-吾瓦门蛇绿混杂岩带东延提供了重要地质依据。该超基性岩主要为变质橄榄岩,呈构造岩块出露于韧性剪切带中。原岩以蚀变单辉橄榄岩、二辉橄榄岩、辉橄岩为主,属钙碱性岩系。岩石普遍蛇纹石化、片理化,与围岩呈构造接触关系。M/F比值平均15.1,大于7,MgO/(MgO+FeO)平均比值0.85,TiO2含量为0.03%～0.14%,小于0.22%。轻重稀土元素分异明显,具Eu正异常特征。表明出露于中天山南缘最北部古洛沟-吾瓦门-拱拜子蛇绿混杂岩带与库米什以南地区榆树沟-铜华山-硫磺山蛇绿混杂岩带并非同一条蛇绿岩带。
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| 关 键 词： | 库米什 板块构造 超基性岩 岩石地球化学特征 大地构造意义 |
Sinkiang Tuokexun County North of Kumishi the Discovery of Oltrabasic Rocks and Tectonic Significance |
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| FENG Xiao-qiang
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ZHANG Zhan-wu
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LI Wei-jun
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HAN Xiang-tao
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LI Huai-min.Sinkiang Tuokexun County North of Kumishi the Discovery of Oltrabasic Rocks and Tectonic Significance[J].Xinjiang Geology,2012,30(2):136-140. |
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| Authors: | FENG Xiao-qiang ZHANG Zhan-wu LI Wei-jun HAN Xiang-tao LI Huai-min |
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| Institution: | 1 (1.Shanxi Provincial Bureau of Geology and Mineral Resources Regional Geological and Mineral Research Institute,xianyang,shanxi,712000,China;2.China University of Geosciences,Beijing,100083,China) |
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| Abstract: | The new discovery of the oltrabasic rocks in north of Ku mishi provide the important geological evidence for the eastward extension of ophiolitic mélange zone in the southern margin of the middle Mount Tianshan Chang a wu zi-Channel gu luo-Gate wu wa.The major of these oltrabasic rocks are metamorphic olive rocks,appearing as tectonic blocks in ductile shear zone.Virgin rocks are mainly ChanHui olive rock,lherzolite and augiteperidotite and they belong to calc alkaline rock series.Rocks have generally serpentinization and foliated and all contact by structures with surrounding rocks.The average ratio of M/F is 15.3 that greater than 7 and tre average ratio of MgO/(MgO+FeO) is 0.85.The content of TiO2 is 0.03%～0.14% that less than 0.22%.Light and heavy rare-earth elements are different from each other obviously that pronounced Eu positive anomaly characteristics.All these prove that the ophiolitic mélange zone appeared in Channel gu luo-Gate a wu-Gong baizi the north of the southern margin of the middle Tianshan Mountain isn’t the same one that appear in Channel elm-Mount Tong hua-Mount brenstone southern area of Ku mishi. |
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| Keywords: | Xinjiang Kumishi Tectonic plates Ultrabasic rock Petrogeochemistry characteristic |
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