| 藏北望牲山火山岩地球化学研究及其构造意义 |
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| 引用本文： | 李保华,伊海生,黄继钧,林金辉,赵兵.藏北望牲山火山岩地球化学研究及其构造意义[J].四川地质学报,2005,25(2):75-80. |
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| 作者姓名： | 李保华 伊海生 黄继钧 林金辉 赵兵 |
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| 作者单位： | 成都理工大学,成都,610059 |
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| 摘 要： | 望牲山火山岩位于金沙江缝合带内，为一套基性—中性火山岩组合，由亚碱性玄武岩、玄武安山岩、安山岩组成。这些火山岩具有Sr、(K)、Rb、Ba、Th富集和Nb、Ta、Ti亏损特征，Nb／Th—Nb、La／Nb—La和Th—Nb—Hf非活动性微量元素组合显示出岛弧火山岩的地球化学特征，是金沙江海槽在晚三叠世期间洋壳俯冲及裂陷的岩浆作用产物。它可能是金沙江缝合带在羌塘盆地北部出露的重要岩石学证据。
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| 关 键 词： | 火山岩 岩石地球化学 大地构造 金沙江缝合带 |
| 文章编号： | 1006-0995(2005)02-0075-06 |
| 修稿时间： | 2005年1月5日 |
Geochemical Features of Volcanic Rocks in Wangshengshan, North Tibet, and Their Tectonic Significance |
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| LI Bao-hua,YIN Hai-sheng,HUANG Ji-jun,LIN Jin-hui,ZHAO Bing.Geochemical Features of Volcanic Rocks in Wangshengshan, North Tibet, and Their Tectonic Significance[J].Acta Geologica Sichuan,2005,25(2):75-80. |
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| Authors: | LI Bao-hua YIN Hai-sheng HUANG Ji-jun LIN Jin-hui ZHAO Bing |
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| Abstract: | Volcanic Rocks in Wangshengshan, North Tibet are bas ic and intermediate volcanic rocks consisting of subalkaline basalt, basaltic ande site, and andesite which are characterized by enrichment in Sr, (K), Rb, Ba, Th and depletion in Nb, Ta, Ti. The Nb/Th-Nb, La/Nb-La and inactive minor element a ssemblage Th-Nb-Hf show geochemical features characteristic of islandarc volcani c rock. They might be formed by subduction and aulacogening of the oceanic crust in the Late Triassic. They may be important petrochemical evidences for exposur e of the Jinshajiang suture zone in north Qiangtang Basin. |
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| Keywords: | volcanic rock petrogeochemistry geotectonic Jinsha jiang suture zone |
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