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现代地质 ›› 2014, Vol. 28 ›› Issue (5): 884-892.

• 岩石学与矿床学 • 上一篇    下一篇

浙西闲林岩体的锆石SHRIMP U-Pb定年及其地质意义

唐增才1,2,董学发1,3,胡文杰1,2,孟祥随1,2,荣一萍2   

  1. (1.浙江省地质调查院,浙江 杭州311203; 2.中国地质大学(武汉)地球科学学院,湖北 武汉430074; 3.中国地质大学(北京)地球科学与资源学院,北京100083)
  • 出版日期:2014-10-25 发布日期:2014-12-29
  • 作者简介:唐增才,男,高级工程师,1980年出生,地质矿产勘查专业,长期从事基础地质及找矿工作。 Email: zjgstzc@163.com。
  • 基金资助:

    中国地质调查局项目“浙江1∶5万临安镇、余杭镇、万市、富阳县幅区调”(1212011120834);浙江省国土资源厅项目“浙西地区中生代岩浆侵入活动及其成矿作用研究”(2014004)。

SHRIMP Zircon U-Pb Dating of Xianlin Granodiorite Rock in Western Zhejiang and Their Geological Significance

TANG Zeng-cai1,2, DONG Xue-fa1,3,HU Wen-jie1,2, MENG Xiang-sui1,2, RONG Yi-ping2   

  1. (1.Zhejiang Institute of Geological Survey, Hangzhou, Zhejiang311203, China; 2.School of Earth Sciences,China University of Geosciences, Wuhan, Hubei430074, China; 3.School of Earth Sciences and Resources,China University of Geosciences, Beijing100083, China)
  • Online:2014-10-25 Published:2014-12-29

摘要:

浙西闲林铁钼矿床地质特征表明,矿床为岩浆期后热液接触交代矽卡岩型,根据岩石蚀变、矿石结构构造和矿物组合,划分了4个成矿阶段。研究表明:闲林矽卡岩型铁钼矿与中生代侵入岩成岩期岩浆热液作用关系密切。运用SHRIMP锆石U-Pb定年方法对闲林花岗闪长岩体的成岩时代进行测定,为(151.8±2.2) Ma,认为与磁铁矿成矿密切相关;结合辉钼矿Re-Os同位素年龄(132.05± 0.47) Ma,与早白垩世花岗岩成岩时代相耦合,进一步限定了闲林地区成岩→成矿活动的时间轨迹,铁钼矿床是晚侏罗世和早白垩世两期成矿形成的。

关键词: 闲林铁钼矿, 锆石SHRIMP U-Pb定年, 花岗闪长岩, 浙西

Abstract:

Geological characteristics show that the Xianlin iron-molybdenum ore deposit belongs to the skarn type and it is formed from the contact replacement of the postmagmatic hydrothermal solutions. There are closely relationships between the formation of the deposit and granodiorite magmatic hydrotherm. According to the altered rocks, ore structure and mineral assemblage, the deposit formation is divided into 4 mineralization stages. The zircon SHRIMP U-Pb dating results indicate that the Xianlin granodiorite were emplaced at (151.8±2.2) Ma, and the Re-Os isotopic age of molybdenite shows that the mineralization took place at (132.05±0.47) Ma. The two ages prove that mineralization events occurred in Late Jurassic and Early Cretaceous, and constraint the time of the rock- formation→mineralization, which represents the time domain of mineralization process of skarn iron-molybdenum ore-forming system in the Xianlin of Western Zhejiang.

Key words: Xianlin iron-molybdenum ore deposit, SHRIMP U-Pb dating of zircon, granodiorite, Western Zhejiang

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