吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (5): 1429-1441.doi: 10.13278/j.cnki.jjuese.201705108

• 地质与资源 • 上一篇    下一篇

辽宁盘岭矿集区花岗岩锆石SHRIMP U-Pb年龄、Hf同位素组成及地质意义

杨凤超1,2, 宋运红1, 赵玉岩3   

  1. 1. 中国地质调查局沈阳地质调查中心, 沈阳 110034;
    2. 吉林大学地球科学学院, 长春 130061;
    3. 吉林大学地球探测科学与技术学院, 长春 130026
  • 收稿日期:2016-12-13 出版日期:2017-09-26 发布日期:2017-09-26
  • 作者简介:杨凤超(1982-),男,博士研究生,高级工程师,主要从事矿产地质调查及研究工作,E-mail:yangfc123@163.com
  • 基金资助:
    中国地质调查局国土资源大调查项目(12120113058800,1212011085280,DD20160049)

Zircon SHRIMP U-Pb Age and Hf Isotope of Granite in Panling Ore Concentration Area in Liaoning and Its Geological Significance

Yang Fengchao1,2, Song Yunhong1, Zhao Yuyan3   

  1. 1. Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, China;
    2. College of Earth Sciences, Jilin University, Changchun 130061, China;
    3. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2016-12-13 Online:2017-09-26 Published:2017-09-26
  • Supported by:
    Supported by Land and Resources Survey Project of China Geological Survey Bureau (12120113058800,1212011085280,DD20160049)

摘要: 辽宁盘岭矿集区产出在辽吉裂谷中段的草河口—草河城—黑峪一带,是一处典型的古元古代沉积盆地和多金属矿集区。矿区内发育有早白垩世的北大砬子岩体和古元古代高丽墩台岩体,与本区的矿化作用密切相关。北大砬子岩体锆石SHRIMP U-Pb年龄加权平均值为(123.9±2.2)Ma,高丽墩台岩体锆石SHRIMP U-Pb年龄加权平均值为(1 872±13)Ma。北大砬子岩体εHf(0)为负值,εHft)为负值(-16.86~-10.95),说明北大砬子岩体形成时壳源物质成分占主导地位,单阶段Hf模式年龄(TDM)平均为1 339 Ma,两阶段Hf模式年龄(TDMC)平均为2 043 Ma;高丽墩台岩体εHf(0)为负值,εHft)为正值(0.29~4.64),说明高丽墩台岩体形成时壳源物质成分占主导地位,并有地幔物质混染,单阶段Hf模式年龄(TDM)平均为2 171 Ma,两阶段Hf模式年龄(TDMC)平均为2 355 Ma。结合岩石地球化学特征得出:北大砬子岩体具有高钾钙碱性岩浆岩特征,为较高分异的过铝质I型花岗岩,是底侵岩浆提供热动力使下地壳物质部分熔融的产物,属于晚中生代大陆边缘岩浆弧环境,其与进入早白垩世古太平洋板块俯冲作用密切相关,岩浆活动直接影响盘岭矿集区内一期铜、铅、锌、钼等矿化作用;高丽墩台岩体具有低钾(拉斑)岩浆岩特征,为较高分异的过铝质I型花岗岩,是热的玄武质熔体加热下地壳使之熔融的产物,且可能有地幔物质贡献,岩体侵入诱发的一系列断裂(包括层间断裂)控制着矿集区内矿脉及岩脉的空间分布。

关键词: 辽宁盘岭矿集区, 花岗岩, 锆石SHRIMP U-Pb年龄, Hf同位素, 早白垩世, 古元古代

Abstract: The Panling ore concentration area is a typical paleoproterozoic sedimentary basin and a multi-metal ore-concentrated area, located in the zone of Caohekou-Caohecheng-Heiyu, also in the middle section of Liaoning-Jilin rift. The Beidalazi rock developed in the Early Cretaceous and the Gaoliduntai rock developed in Paleoproterozoic are closely related with the mineralization in this ore-concentrated area. The weighted average of the zircon SHRIMP U-Pb age of the Beidalazi rock is (123.9±2.2) Ma, and the weighted average of the zircon SHRIMP U-Pb age of the Gaoliduntai rock is (1 872±13) Ma. The εHf(0) value of the Beidalazi rock is negative, and the εHf (t) is (-16.86——10.95), that indicate its shell material domination when the Beidalazi rock formed. The single stage Hf model age (TDM) is 1 339 Ma, and the two-stage Hf model age (TDMC) is 2 043 Ma. The εHf(0) value of Gaoliduntai rock is negative, and the εHf(t) is 0.29-4.64, that indicate the shell material domination when the Gaoliduntai rock formed. The single stage Hf model age (TDM) is 2 171 Ma, and the two-stage Hf model age (TDMC) is 2 355 Ma. The geochemical results show that:The Beidalazi rock is of high-K calc-alkaline series and highly differentiated aluminous I-type granite, and it is a thickened and molten product of the lower crust with a serious magma contamination in the Late Mesozoic continental margin magmatic arc environment resulted from the Early Cretaceous subduction of the paleo Pacific plate; The magmatic activity directly led to the mineralization of copper, lead, zinc and molybdenum etc. in Panling area. While the Gaoliduntai rock is a kind of low potassium magmatite (tholeiitic) and highly differentiated aluminous I-type granite caused by the melting of the basaltic melt to heat the crust to melt, and it may have the contribution of mantle material invasion induced by a series of faults (including inter-layer fractures) to control the mineralization and distribution of the ore veins.

Key words: Liaoning Panling ore concentration area, granite, zircon SHRIMP U-Pb age, Hf isotope, Early Cretaceous, Paleoproterozoic

中图分类号: 

  • P588.121
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