| 藏北若拉岗日C-P1裂谷带的发现及构造意义 |
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| 引用本文： | 穆利修,王宏运,罗宏伟.藏北若拉岗日C-P1裂谷带的发现及构造意义[J].新疆地质,2006,24(1):16-23. |
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| 作者姓名： | 穆利修 王宏运 罗宏伟 |
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| 作者单位： | 1. 新疆维吾尔自治区地质调查院一所,新疆,乌鲁木齐,830011
2. 河南省有色金属地质矿产局第六地质大队,河南,洛阳,471002 |
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| 摘 要： | 若拉岗日裂谷带位于拉竹龙-西金乌兰-金沙江结合带的中段,该带作为一条重要的大地构造分界线已被地学界所注目.在西金乌兰地区发现了蛇绿混杂岩带,在金沙江、甘孜理塘等地保留有较完整的洋壳残片(蛇绿混杂岩套)和岛弧火山岩建造,其西延的若拉岗日一带,没有见到这些地质体.基性岩(脉)和少量超基性岩脉是三叠纪热侵位的产物,地球化学等特征表明,它们不是MORB型基性岩,更多地体现板内裂谷特征;石炭系—下二叠统基性火山岩以碱性系列玄武岩为主,具裂谷型双峰式特征,岩石地球化学等特征表明,它们形成于板内或板内裂谷;酸性花岗岩类侵入岩极不发育,构造岩浆带不发育.
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| 关 键 词： | 藏北高原 裂谷带 岩石化学 地球化学 |
| 文章编号： | 1000-8845(2006)01-016-08 |
| 收稿时间： | 09 23 2005 12:00AM |
| 修稿时间： | 11 8 2005 12:00AM |
THE C-P1 RUOLAGANGRI RIFT VALLEY IN NORTHERN TIBETAND IT'S STRUCTURAL SIGNIFICANCE |
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| MU Li-xiu,WANG Hong-yun,LUO Hong-wei.THE C-P1 RUOLAGANGRI RIFT VALLEY IN NORTHERN TIBETAND IT''''S STRUCTURAL SIGNIFICANCE[J].Xinjiang Geology,2006,24(1):16-23. |
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| Authors: | MU Li-xiu WANG Hong-yun LUO Hong-wei |
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| Institution: | 1.No. 1 Institute of Geology Investigation Research, BGMRED of Xinjiang, Urumqi, Xinjiang, 830011, China; 2. No. 6 Geological Team, Geological division of the Bureau of Henan Nonferrous-metal, Luo Yang, Henan, 471002, China |
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| Abstract: | The Ruolagangri rift valley is located in the middle part of jointed belt,defined by the Lazhulong,Xijinwulan and Jinshajiang Rivers.This belt is considered to be an important tectonic boundary.Extensive geological studies from southeast of Xijinwulan Lake to the first part of Jinshajiang River have been conducted.An ophiolite complex was found in the Xijinwulan region that with island arc volcanics are well preserved in the Jinshajiang River and Ganzilitang areas.These geological bodies are not found in the western extension of the Ruolagangri area.Basic rocks and some ultra-basic rock were formed from the production of heat in the Triassic Period.According to their geochemical characteristics,they are not MORB type basic rocks,but instead show the characteristics of block rift valley.Basic volcanic rocks in the Carboniferous Period and Lower-Permian Period are mainly alkaline basalts with rift-valley double-peak style characteristics.The geochemical characteristics show that the rocks were formed in the plate or rift-valley plate.Acidic granite intrusive rocks are not developed suggesting the tectonic magmatic belt was not well developed. |
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| Keywords: | Tibetan plateau rift valley belt petrochemistry geochemical |
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