东天山土屋-延东斑岩铜矿带埃达克岩及其与成矿作用的关系

张连昌 秦克章 英基丰 夏斌 舒建生. 东天山土屋-延东斑岩铜矿带埃达克岩及其与成矿作用的关系[J]. 岩石学报, 2004, 20(2): 259-268.
引用本文: 张连昌 秦克章 英基丰 夏斌 舒建生. 东天山土屋-延东斑岩铜矿带埃达克岩及其与成矿作用的关系[J]. 岩石学报, 2004, 20(2): 259-268.
ZHANG LianChang,QIN KeZhang,YING JiFeng,XIA Bin and SHU JianSheng Key Lab. of Mineral Resourcews,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China Resources College of Chang an University,Xi''an 710054,China. The relationship between ore-forming processes and adakitic rock in Tuwu-Yandong porphyry copper metallogenic belt, eastern Tianshan mountains[J]. Acta Petrologica Sinica, 2004, 20(2): 259-268.
Citation: ZHANG LianChang,QIN KeZhang,YING JiFeng,XIA Bin and SHU JianSheng Key Lab. of Mineral Resourcews,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China Resources College of Chang an University,Xi''an 710054,China. The relationship between ore-forming processes and adakitic rock in Tuwu-Yandong porphyry copper metallogenic belt, eastern Tianshan mountains[J]. Acta Petrologica Sinica, 2004, 20(2): 259-268.

东天山土屋-延东斑岩铜矿带埃达克岩及其与成矿作用的关系

  • 基金项目:

    国家重点基础研究发展规划项目(2001CB409805),中国科学院知识创新工程重要方向项目(KZCX3-SW-137)资助的项目。

  • 土屋-延东铜矿带位于东天山晚古生代大南湖增生岛弧带,各矿岩石斜长花岗疵岩侵入于岛弧火山岩区通过对容矿围岩化学组成的研究表明,主量元素SiO2、Al2O3和MgO的含量分别为64.37%~72.28%、17.77%~17.7l%和0.55%~1.35%,微量元素Y、Yb和Sr的含量分别为4.42~11.1(μg/g),0.38~0.87(μg/g)和619~738(μg/g),LREE为富集型和Eu为正异常,这些特征反映斜长花岗斑岩为埃达克质岩,本区埃达克岩与铜矿化存在密切的时空关系,铜矿形成时代与埃达克岩相近,形成于早石炭世,而火山岩形成于泥盆纪、铜矿与埃达克宕紧密共生,矿区范围埃达克岩多被蚀变并铜矿化。同位素地球化学特征反映,埃达克质岩浆为成矿提供了主要的物质和流体来源。进一步研究表明,岛弧火山岩与具埃达克岩性质的斜长花岗斑岩形成于不同的地质过程。本区中基性-中酸性的岛弧火山岩是由于大洋板块俯冲到深部,因脱水作用使板片之上的地幔楔发生部分熔融而形成的。而埃达克岩是俯冲到深处具MORB性质的板片在一定的物理化学条件下发生部分熔融后直接侵位于近地表而形成的。
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修回日期:  2003-09-08
刊出日期:  2004-03-31

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