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西藏泽当地区晚白垩世埃达克岩的发现及其成矿意义

赵珍 胡道功 陆露 吴珍汉

赵珍, 胡道功, 陆露, 等, 2013. 西藏泽当地区晚白垩世埃达克岩的发现及其成矿意义. 地质力学学报, 19 (1): 45-52, 112.
引用本文: 赵珍, 胡道功, 陆露, 等, 2013. 西藏泽当地区晚白垩世埃达克岩的发现及其成矿意义. 地质力学学报, 19 (1): 45-52, 112.
ZHAO Zhen, HU Dao-gong, LU Lu, et al., 2013. DISCOVERY AND METALLOGENIC SIGNIFICANCE OF THE LATE CRETACOUS ADAKITES FROM ZETANG, TIBET. Journal of Geomechanics, 19 (1): 45-52, 112.
Citation: ZHAO Zhen, HU Dao-gong, LU Lu, et al., 2013. DISCOVERY AND METALLOGENIC SIGNIFICANCE OF THE LATE CRETACOUS ADAKITES FROM ZETANG, TIBET. Journal of Geomechanics, 19 (1): 45-52, 112.

西藏泽当地区晚白垩世埃达克岩的发现及其成矿意义

基金项目: 

中国地质调查局项目 编号:1212011120185

详细信息
    作者简介:

    赵珍(1987-), 女, 硕士研究生, 构造地质学专业。E-mail:zhaozhen03@126.com

  • 中图分类号: P584

DISCOVERY AND METALLOGENIC SIGNIFICANCE OF THE LATE CRETACOUS ADAKITES FROM ZETANG, TIBET

  • 摘要: 埃达克岩对造山带深部构造和热体制具有指示意义,与Cu、Au等成矿关系密切。冈底斯成矿带东段南缘泽当地区桑布加拉矽卡岩型铜矿成矿母岩花岗闪长岩的主量元素测量结果显示高SiO2(>56%)、高Al2O3(>15%)、低MgO( < 3%),Na2O含量≥ 3.5%,K2O含量>2%,Na2O/K2O为1.03~1.43,平均1.22;稀土元素和微量元素测量结果显示高Sr(>400×10-6),低Yb( < 1.9×10-6)、低Y( < 15×10-6),高Sr/Y(86.88~132.22,>20)、高La/Yb(>10),LREE富集,HREE亏损,无负Eu异常,为埃达克岩地球化学特征。结合地质特征分析认为其是由俯冲洋壳板片部分熔融后与地幔橄榄岩发生相互作用形成的O型埃达克岩,说明冈底斯南缘存在O型埃达克岩成矿。

     

  • 图  1  泽当地区地质略图

    (据1:250000泽当幅改编)

    Figure  1.  Simplified geological map of Zetang

    图  2  石TAS图解

    Figure  2.  TAS classification of the granitoid rocks

    图  3  K2O-SiO2图解

    Figure  3.  K2O-SiO2 diagram

    图  4  稀土元素配分曲线

    Figure  4.  REE distribution patterns

    图  5  微量元素蛛网图

    Figure  5.  Trace element spider diagrams

    图  6  埃达克岩Sr/Y-Y和(La/Yb)N-YbN图解

    Figure  6.  Sr/Y vs. Y diagram and(La/Yb)N vs. YbN diagram for the adakite

    图  7  埃达克成因判别图

    Figure  7.  Discrimination diagrams of the adakites sources

    表  1  样品主量元素和微量元素分析结果

    Table  1.   Major elements and trace elements of the samples

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  • 收稿日期:  2012-09-23
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