| 滇西北羊拉矿区基性岩地球化学特征及构造意义 |
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| 引用本文： | 朱俊.滇西北羊拉矿区基性岩地球化学特征及构造意义[J].地质与勘探,2010,46(5). |
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| 作者姓名： | 朱俊 |
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| 作者单位： | 昆明理工大学;云南省地质调查局;中国冶金地质总局矿产资源研究院;云南财经大学;中国地质科学院地质研究所;东华理工大学;云南迪庆矿业开发有限责任公司; |
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| 基金项目： | 国家科技支撑计划项目(编号:2006BAB01A07)资助 |
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| 摘 要： | 对滇西北金沙江带羊拉矿区的基性岩进行了系统的主量元素和微量元素研究,同时对比白茫雪山-拱卡路线上与蛇绿岩共生的玄武熔岩的地球化学性质,探讨羊拉矿区基性岩形成的地质构造背景。研究表明,矿区下石炭统贝吾组玄武岩与白茫雪山-拱卡玄武岩地球化学性质相似,具洋脊之特征,低K,Ti,轻重稀土元素分馏不明显,微量元素特征指示二者可能来自于较富集的源区,均为金沙江洋盆扩张的产物,属于缝合带的组成部分。矿区泥盆系地层内的辉绿岩脉斜交侵入围岩,晚于火山岩和洋盆沉积物的形成,辉绿岩脉稀土元素标准化曲线右倾,强不相容元素富集,Ta、Nb亏损,具大陆边缘岛弧性质,微量元素特征与大洋玄武岩和洋内岛弧玄武岩亦存在一定差异,推测辉绿岩脉可能形成于三叠纪金沙江带陆缘岛弧岩浆活动阶段,对于有的学者确定该区为洋内岛弧构造环境的认识在本次工作中没有得到验证。
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| 关 键 词： | 羊拉矿区 基性岩 地球化学 构造环境 |
| 收稿时间： | 2010/3/25 0:00:00 |
| 修稿时间： | 2010/8/10 0:00:00 |
Geochemical Characteristics and Tectonic Significance of Basic Rocks in the
Yangla Ore District,Northwestern Yunnan Province |
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| ZHU Jun.Geochemical Characteristics and Tectonic Significance of Basic Rocks in the
Yangla Ore District,Northwestern Yunnan Province[J].Geology and Prospecting,2010,46(5). |
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| Authors: | ZHU Jun |
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| Institution: | ZHU Jun1,LI Wen-chang2,ZENG Pu-sheng3,4,YIN Guang-hou2,Wang Yan-bin5,WANG Yong6,YU Hai-jun2,DONG Tao2,DENG Yun-qing7,LUO Cheng7(1. Kunming University of Science and Technology,Kunming 650093,2. Yunnan Geological Survey bureau,Kunming 650051,3. Institute of Mineral Resources Research,China Metallurgy Geological Bureau,Beijing 100025,4. Yunnan University of Finance and Economics,Kunming 650221,5. Institute of Geology Chinese Academy of Geological Science,Beijing 100037,6. East China Institute of Technology,Fu... |
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| Abstract: | In order to study the tectonic settings of the Yangla ore district in the Jinshajiang zone,western Yunnan province,this work made a systematic geochemical analysis of major elements and trace elements for basic rocks from this ore district,and compared them with the geochemical properties of basalt lava coexisting with ophiolite in the route from the Baimang snow Mountains to Gongka.The result shows that the geochemical characteristics of basalt from Beiwu Formation in Lower Carboniferous of the Yangla ore ... |
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| Keywords: | Yangla ore district basic rocks geochemistry tectonic setting |
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