广东文光岭铅锌铜多金属矿花岗闪长岩LA-ICP-MS锆石U-Pb定年、地球化学特征及其成因 |
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引用本文: | 欧阳志侠,楚克磊,陈友良,吴晓东,杨胜虎,汪汝澎,刘东宏,汪礼明. 广东文光岭铅锌铜多金属矿花岗闪长岩LA-ICP-MS锆石U-Pb定年、地球化学特征及其成因[J]. 地球科学, 2019, 44(4): 1327-1337. DOI: 10.3799/dqkx.2017.591 |
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作者姓名: | 欧阳志侠 楚克磊 陈友良 吴晓东 杨胜虎 汪汝澎 刘东宏 汪礼明 |
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作者单位: | 1.广东省有色金属地质局, 广东广州 510080 |
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基金项目: | 中国地质调查局地质调查工作项目12120114015801中国地质调查局地质调查工作项目1212011120826 |
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摘 要: | 广东省文光岭矿床是云开地区近年来新发现的铅锌铜多金属矿.以文光岭花岗闪长岩作为研究对象,对其开展了LA-ICP-MS锆石U-Pb同位素定年和地球化学特征研究.获得其锆石206Pb/238U同位素加权平均年龄为165.7±1.9 Ma(n=18,MSWD=3.1).花岗闪长岩属于准铝质Ⅰ型花岗岩,SiO2含量在64.11%~66.64%之间,Al2O3含量为14.9%~15.57%,MgO含量在1.39%~1.61%之间,K2O+Na2O含量介于6.5%~7.21%,K2O/Na2O=1.25~2.74,铝饱和指数A/CNK=0.93~1.11.轻、重稀土元素分馏作用明显,(La/Yb)N=13.03~17.83,具有弱的负铕异常(δEu为0.70~0.88),HFSE和LILE分异明显,富集Rb、Th、U、K等元素,亏损Nb、Ta、P和Ti等元素.结合区内已有资料,认为文光岭铅锌铜多金属矿床的形成与古太平洋板块的俯冲作用密切相关.
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关 键 词: | 文光岭铅锌铜多金属矿 LA-ICP-MS锆石U-Pb定年 地球化学 云开地区 |
收稿时间: | 2017-12-05 |
Zircon U-Pb Dating,Geochemistry and Petrogenesis of Granodiorite from Wenguangling Pb-Zn-Cu Polymetallic Deposit in Guangdong Province |
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Abstract: | The recently discovered Wenguangling deposit is a Pb-Zn-Cu polymetallic deposit, located in the Yunkai area. It was firstly investigated of the granodiorites from the Wenguangling deposit by integrating in situ zircon U-Pb dating and geochemical analysis. Eighteen zircons from sample WGL-02 yield excellently concordant results with a weighted mean 206Pb/238U age of 165.7±1.9 Ma (n=18, MSWD=3.1). The Wenguangling granodiorites belong to metaluminous Ⅰ-type granite. Their SiO2 and Al2O3 contents are 64.11%-66.64% and 14.9%-15.57%, respectively. The MgO contents are between 1.39% and 1.61%. The alkali (K2O+Na2O) contents range from 6.5% to 7.21%, with K2O/Na2O ratios from 1.25 to 2.74. Their aluminum indexes (A/CNK ratios) are 0.93-1.11. The granodiorites are also characterized by noteworthy fractionation between LREE and HREE ((La/Yb)N=13.03-17.83), with weak negative Eu anomalies (δEu=0.70-0.88). The trace element analyses show clear fractionation between HFSE and LILE, and the granodiorites are strongly enriched in Rb, Th, U and K but depleted in Nb, Ta, P and Ti. Based on the geochemistry, zircon U-Pb dating of the Wenguangling granodiorite and regional tectonic evolution, it is infered that the formation of the Wenguangling Pb-Zn-Cu polymetallic deposit is closely associated with the subduction of the Paleo-Pacific plate. |
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