| 青海喀雅克登锌多金属矿床二长花岗岩锆石U-Pb定年及其地质意义 |
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| 引用本文： | 张勇,赵永亮,李恒恒,张胜,周青禄,熊宇玲.青海喀雅克登锌多金属矿床二长花岗岩锆石U-Pb定年及其地质意义[J].地质找矿论丛,2016,31(1):47-54. |
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| 作者姓名： | 张勇 赵永亮 李恒恒 张胜 周青禄 熊宇玲 |
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| 作者单位： | 1. 青海省第三地质矿产勘查院,西宁,810029;2. 青海省第六地质矿产勘查院,西宁,810008 |
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| 基金项目： | 中国地质调查局矿产调查评价项目(1212011221047) |
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| 摘 要： | 青海喀雅克登锌多金属矿床与成矿关系密切的二长花岗岩通过LA-MC-ICP-MS锆石U-Pb测年,年龄为(403.1±1.2)Ma,MSWD=0.46,属于早泥盆世;矿区的锌多金属矿体主要产于二长花岗岩与古元古代金水口岩群白沙河岩组大理岩岩段接触部位的夕卡岩中,表明喀雅克登锌多金属矿床形成于(或晚于)(403.1±1.2)Ma。二长花岗岩中w(MgO)=0.21%~0.87%,w(FeO_t)=0.93%~3.93%,Mg~#=25.5~34.66,K_2O/Na_2O=1.0~1.72,A/CNK=0.89~1.17,属高钾钙碱性、准铝质花岗岩系列,为壳源岩浆。喀雅克登锌多金属矿床形成于后碰撞阶段,受幔源岩浆底侵改造。
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| 关 键 词： | 喀雅克登锌多金属矿床 二长花岗岩 锆石U-Pb年龄 地球化学特征 青海省 |
| 收稿时间： | 2015/1/9 0:00:00 |
Zircon U-Pb dating and geological significance of monzonitic granite of Kayakedeng zinc polymetallic deposit in Qinghai |
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| ZHANG Yong,ZHAO Yongliang,LI Hengheng,ZHANG Sheng,ZHOU Qinglu and XIONG Yuling.Zircon U-Pb dating and geological significance of monzonitic granite of Kayakedeng zinc polymetallic deposit in Qinghai[J].Contributions to Geology and Mineral Resources Research,2016,31(1):47-54. |
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| Authors: | ZHANG Yong ZHAO Yongliang LI Hengheng ZHANG Sheng ZHOU Qinglu and XIONG Yuling |
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| Institution: | The Third Geological and Mineral Exploration Institnte of Qinghai Province, Xining 810029, China;The Third Geological and Mineral Exploration Institnte of Qinghai Province, Xining 810029, China;The Third Geological and Mineral Exploration Institnte of Qinghai Province, Xining 810029, China;The Third Geological and Mineral Exploration Institnte of Qinghai Province, Xining 810029, China;The Third Geological and Mineral Exploration Institnte of Qinghai Province, Xining 810029, China;The Sixth Geological and Mineral Exploration Institnte of Qinghai Province, Xining 810008, China |
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| Abstract: | A monzonitic granite is genetically closely related to Kayakedeng zinc polymetallic deposit whose zircon U-Pb age dating by LA-MC-ICP-MS is (403.1±1.2) Ma (MSWD=0.46) belonging to Early Devonian Epoch. Ore bodies mainly occur in the skarn at contact between the monzonitic granite and the marble member of Baishahe formation of Paleoproterozoic Jinshuikou thus we assume that Kayakedeng zinc polymetallic deposit is formed at or later than (403.1±1.2) Ma. w(MgO)=0.21%-0.87%,w(FeOt)=0.93%-3.93%,Mg#=25.5-34.66,K2O/Na2O=1.0-1.72,A/CNK=0.89-1.17 of the granite indicate that it belongs to high potassium calc-alkaline and metaluminous rock series derived from crustal magma. We consider that the Kayakedeng zinc polymetallic deposit was formed in the post-orogenic stage and reworked by diaper of mantle materials. |
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| Keywords: | Kayakedeng zinc polymetallic deposit monzonitic granite zircon U-Pb age geochemical characteristics Qinghai province |
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