| 华南南岭地区中生代花岗岩体年代学及氧逸度特征 |
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| 引用本文： | 孙占亮.华南南岭地区中生代花岗岩体年代学及氧逸度特征[J].地球科学与环境学报,2014(1):141-151. |
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| 作者姓名： | 孙占亮 |
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| 作者单位： | 山西省地质调查院,山西太原030006 |
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| 基金项目： | ：中国科学院知识创新工程重大项目（KZCX1-YW-15-1）;国家自然科学基金项目（41203028） |
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| 摘 要： | 华南南岭地区中生代花岗岩钨锡成矿活动十分剧烈。采集了南岭地区清湖岩体、姑婆山岩体(锡矿)、雪花顶岩体、骑田岭岩体(锡钨矿)和九峰岩体5处出露花岗岩锆石样品,并进行锆石UPb年代学和微量元素分析。结果表明:花岗岩年龄主要集中在146~166Ma之间,与前人所测年龄在误差范围内一致;其锆石Ce4+/Ce3+值总体偏低(低于200),EuN/Eu*N值均小于0.4,无论是与锡(钨)矿有关的花岗岩还是普通花岗岩,都显示较低的氧逸度特征,明显低于年龄较老的大宝山铜钼矿、德兴斑岩铜矿的锆石Ce、Eu异常。因此,南岭地区中生代时可能离古太平洋板块俯冲带较远,受到俯冲流体影响较弱,可能形成于古太平洋板块SW向俯冲背景下。
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| 关 键 词： | 花岗岩 氧逸度 锆石U-Pb年龄 钨锡矿 中生代 太平洋板块俯冲 南岭地区 |
Geochronology and Oxygen Fugacity of Mesozoic Granites in Nanling Area of South China |
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| SUN Zhan-liang.Geochronology and Oxygen Fugacity of Mesozoic Granites in Nanling Area of South China[J].Journal of Earth Sciences and Environment,2014(1):141-151. |
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| Authors: | SUN Zhan-liang |
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| Institution: | SUN Zhan-liang (Shanxi Institute of Geological Survey, Taiyuan 030006, Shanxi, China) |
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| Abstract: | W-Sn mineralization of Mesozoic granites in Nanling area of South China is very strong. Five granite zircon samples from Qinghu,Guposhan （Sn deposit）,Xuehuading,Qitianling （Sn-W deposit）and Jiufeng plutons in Nanling area were conducted and measured by zircon U-Pb geochronology and trace element analysis.The results show that granite ages are mainly formed at 146-166 Ma,consistent with previous measured ages within errors;all the calculated zircon Ce^4＋/Ce^3＋ values are lower than 200,the EuN/EuN^＊ values are less than 0.4,and granites related with W （Sn）deposit or barren granites have lower oxygen fuga city than that of the older Dabaoshan Mo-Cu-W deposit and Dexing porphyry Cu deposit.Therefore, Nanling area is possible far from subduction zone of Paleo-Pacific Plate in Mesozoic,is weakly influenced by subduction fluids,and is affected by SW-trending subduction of Paleo-Pacific Plate. |
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| Keywords: | granite oxygen fugacity zircon U-Pb age W-Sn deposit Mesozoic Pacific Plate subduction Nanling area |
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