| 羌塘沱沱河地区多才玛二长岩SHRIMP锆石U-Pb年代学及岩石地球化学 |
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| 引用本文： | 晁温馨,李碧乐,杨文龙,彭勃,宁传奇,高雄伟.羌塘沱沱河地区多才玛二长岩SHRIMP锆石U-Pb年代学及岩石地球化学[J].世界地质,2017,36(3):691-700. |
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| 作者姓名： | 晁温馨 李碧乐 杨文龙 彭勃 宁传奇 高雄伟 |
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| 作者单位： | 1. 吉林大学地球科学学院, 长春 130061;2. 吉林省核工业地质局, 长春 130062 |
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| 基金项目： | 青海沱沱河整装勘查区富铅锌矿成矿规律及富矿体找矿部署研究（12120114080901）资助. |
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| 摘 要： | 对青海省羌塘地块东北缘沱沱河多才玛铅锌矿区二长岩进行了系统的锆石U-Pb年龄和地球化学研究。结果表明二长岩属于钙碱性-高钾钙碱性,准铝质岩石,具有较高的Na_2O和较低的K_2O、MgO。样品的高Rb/Sr比值(0.21~0.47)、低Nb/Ta比值(13.25~14.02)和低Mg#值等特征显示二长岩岩浆来源于地壳。样品富集轻稀土元素(LREE)、大离子亲石元素(LILE)(Rb,Ba,K,Sr),以及活泼的不相容元素(Th、U),同时亏损高场强元素(HFSE)(Nb、Ta、P、Ti),与弧火山岩特征相似。二长岩的SHRIMP锆石U-Pb定年结果为(65.8±1.1)Ma,显示其形成于晚白垩世—早古新世。结合区域地质背景,推测多才玛二长岩形成于特提斯大洋板块的后期深俯冲阶段。
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| 关 键 词： | 二长岩 SHRIMP锆石年龄 地球化学 多才玛 羌塘 青海 |
| 收稿时间： | 2017-03-06 |
| 修稿时间： | 2017-06-11 |
SHRIMP zircon U-Pb ages and geochemistry of monzonite in Duocaima,Tuotuohe area,Qiangtang |
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| CHAO Wen-xin,LI Bi-le,YANG Wen-long,PENG Bo,NING Chuan-qi,GAO Xiong-wei.SHRIMP zircon U-Pb ages and geochemistry of monzonite in Duocaima,Tuotuohe area,Qiangtang[J].World Geology,2017,36(3):691-700. |
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| Authors: | CHAO Wen-xin LI Bi-le YANG Wen-long PENG Bo NING Chuan-qi GAO Xiong-wei |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. Jilin Bureau of Geology for Nuclear Industry, Changchun 130062, China |
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| Abstract: | The Duocaima Pb-Zn deposit is located in the northeast margin of Qiangtang block of Qinghai.The authors undertook a detailed study of zircon U-Pb dating and geochemistry of the monzonite in Tuotuohe mining area.The results indicate that the monzonite is calc-alkaline to high-K calc-alkaline and aluminous,and is characterized by relatively high Na2O,low K2O and MgO.The samples have higher Rb/Sr(0.21~0.47),lower Nb/Ta(13.25~14.02),and low Mg#, etc.,indicating that the monzonite was derived from crust.The samples are enriched in LREE,LILE (e.g.,Rb,Ba,K,Sr),and active incompatible elements (e.g.,Th,U),and depleted in HFSE(e.g.,Nb,Ta,P,Ti),similar to the characteristics of volcanic arc magmas.The SHRIMP zircon U-Pb dating of the monzonite yields Late Cretaceous to Early Paleocene ages (65.8±1.1Ma).Combined with regional geological background,it is concluded that the monzonite was probably formed during the late stage of deep subduction of Tethys Oceanic Plate. |
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| Keywords: | monzonite SHRIMP zircon U-Pb ages geochemistry Duocaima Qiangtang Qinghai |
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