| 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 |
| 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 |
| Zircon U-Pb dating and geological significance of monzonitic granite of Kayakedeng zinc polymetallic deposit in Qinghai |
| 投稿时间：2015-01-09 |
| DOI：10.6053/j.issn.1001-1412.2016.01.006 |
| 中文关键词: 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 |
| 英文关键词:Kayakedeng zinc polymetallic deposit monzonitic granite zircon U-Pb age geochemical characteristics Qinghai province |
| 基金项目:中国地质调查局矿产调查评价项目(编号:1212011221047)资助。 |
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| 中文摘要: |
| 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(FeOt)=0.93%~3.93%,Mg#=25.5~34.66,K2O/Na2O=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。 |
| 英文摘要: |
| 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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