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东天山维南地区下石炭统火山岩地球化学特征及地质意义

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刘得文, 王根厚. 东天山维南地区下石炭统火山岩地球化学特征及地质意义[J]. 西北地质, 2014, 47(1): 71-83.
引用本文: 刘得文, 王根厚. 东天山维南地区下石炭统火山岩地球化学特征及地质意义[J]. 西北地质, 2014, 47(1): 71-83.
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LIU De-wen, WANG Gen-hou. Geochemical Characteristics and Geological Significance of the Lower Carboniferous Series Volcanic Rocks in Weinan Area, Eastern Tianshan[J]. Northwestern Geology, 2014, 47(1): 71-83.
Citation: LIU De-wen, WANG Gen-hou. Geochemical Characteristics and Geological Significance of the Lower Carboniferous Series Volcanic Rocks in Weinan Area, Eastern Tianshan[J]. Northwestern Geology, 2014, 47(1): 71-83.
shu

东天山维南地区下石炭统火山岩地球化学特征及地质意义

  • 中国地质大学(北京)地球科学与资源学院, 北京 100083

  • 基金项目: 国家自然科学基金重点项目“燕山—太行山北段中生代构造变动精细过程及其与华北克拉通破坏的关系”（90814007）

Geochemical Characteristics and Geological Significance of the Lower Carboniferous Series Volcanic Rocks in Weinan Area, Eastern Tianshan

  • School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

    摘要
  • 新疆东天山维南地区下石炭统雅满苏组第三岩性段火山岩由基性-中、酸性岩类组成，其中SiO2、K2O、Na2O含量范围分别为48.9%~81.0%、0.2%~5.7%、1.6%~7.9%，该套火山岩属低钾-高钾钙碱性系列；对微量和稀土元素分析，表明稀土元素分配型式均为略向右倾的平滑型曲线，LREE有一定富集，具明显的δEu负异常，中、酸性岩类具有明显的Nb、Sr、P、Ti负异常。综合研究表明，研究区火山岩具有成熟岛弧-陆缘弧的岩石地球化学特征。该套火山岩是研究区铜锌矿富集层位，对其开展地质和地球化学研究，对于区域找矿具有重要意义。从东天山觉罗塔格区域地球化学与成矿的关系分析看，区域矿化受到火山-沉积建造与断裂带的控制，该中、酸性岩石成矿物质富集明显，说明中酸性岩浆与构造活动在矿床的形成过程中起到了重要的作用。
    The volcanic rock of 3rd lithologic section in the Lower Carboniferous Series Yamansu Formation in Weinan area of Eastern Tianshan is consisted of the basic, neutral and acidic rocks, and is defined as the calc-alkaline volcanic rock series, with SiO2 content of 48.9%-81.0%, K2O content of 0.2%-5.7%, and Na2O content of 1.6%-7.9%. Analysis on trace and rare earth elements suggests that, the distribution patterns of rare earth elements are all smooth curves rightward, with enrichment of LREE and obvious δEu negative anomaly. There is also obvious negative anomaly of Nb, Sr, P and Ti in neutral and acidic rocks. Comprehensive analysis demonstrates that volcanic rocks in the study area have geochemical characteristics of island arc-epicontinental arc rocks. The volcanic rock series is found abundant in Cu-Zn deposits, thus it is significant in geological and geochemical research as well as prospecting of Cu-Zn deposits. The relationship between geochemistry and mineralization of Jueluotage region of East Tianshan indicates that regional mineralization is controlled by volcano-sediment formation and fault. Rich mineralization material in these neutral and acidic rocks illustrates that intermediate-acidic magma and tectonic activity play important roles in the deposit formation.
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收稿日期:  2014-01-04
修回日期:  2014-02-24
刊出日期:  2014-03-15

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