| 博格达山白杨河地区中基性岩墙地球化学特征及其地质意义 |
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| 引用本文： | 欧阳征健,周鼎武,林晋炎,冯娟萍.博格达山白杨河地区中基性岩墙地球化学特征及其地质意义[J].大地构造与成矿学,2006,30(4):495-503. |
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| 作者姓名： | 欧阳征健 周鼎武 林晋炎 冯娟萍 |
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| 作者单位： | 1. 大陆动力学国家重点实验室,西北大学地质学系,陕西,西安,710069
2. 大陆动力学国家重点实验室,西北大学地质学系,陕西,西安,710069;山东科技大学,地球信息科学与工程学院,山东,青岛,266510 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | 白杨河地区中基性岩墙地球化学研究显示,该岩墙属于亚碱性系列,为岩浆高度演化的产物,轻稀土元素适度富集,轻重稀土分异中等,Nb、Ta强烈亏损,Ti、Zr和Hf适度亏损,不相容元素(K、Rb、Ba、Sr、LREE)与Pb富集,说明该岩墙源自与俯冲作用有关的交代地幔,且在侵位过程中受到地壳物质的混染。该岩墙侵位时期可能为270~250Ma左右,为造山期后伸展环境下的产物,是中亚造山带后碰撞阶段陆壳垂向生长的重要标志。
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| 关 键 词： | 博格达 白杨河 中基性岩墙 地球化学 交代 |
| 文章编号： | 1001-1552(2006)04-0495-09 |
| 收稿时间： | 2006-02-27 |
| 修稿时间： | 2006-03-20 |
GEOCHEMISTRY AND GEOLOGICAL IMPLICATIONS OF THE BAIYANGHE BASIC-INTERMEDIATE DYKE SWARM IN THE BOGDA OROGENIC BELT IN XINJIANG, CHINA |
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| OUYANG Zhengjian,ZHOU Dingwu,LIN Jinyan,FENG Juanping.GEOCHEMISTRY AND GEOLOGICAL IMPLICATIONS OF THE BAIYANGHE BASIC-INTERMEDIATE DYKE SWARM IN THE BOGDA OROGENIC BELT IN XINJIANG, CHINA[J].Geotectonica et Metallogenia,2006,30(4):495-503. |
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| Authors: | OUYANG Zhengjian ZHOU Dingwu LIN Jinyan FENG Juanping |
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| Abstract: | Geochemical characteristics of the Baiyanghe basic-intermediate dyke swarm show that the dyke swarm belongs to the subalkaline series and the magma for the dykes was highly evolutionary as it is enriched in LREE, LILE (K, Rb, Ba, Sr), Pb, and depleted moderately in Nb, Ta, Ti, Zr, Hf. All these suggest that it has been metasomatised by the fluid in subduction zone, and contaminated by materials derived from the earth's crust. During late Paleozoic, Northern Xinjiang was in a postcollisional setting and characterized by significant addition of mantle-derived magmas and their differentiation in the crust. The Baiyanghe dyke swarm was intruded in the range of 270~250Ma possibly, and is indicative of the vertical growth of continental crust. |
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| Keywords: | Bogda Mountains Baiyanghe basic-intermediate dyke geochemistry metasomatism |
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