冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成:新特提斯洋早侏罗世俯冲作用的证据

张宏飞 徐旺春 郭建秋 宗克清 蔡宏明 袁洪林. 冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成:新特提斯洋早侏罗世俯冲作用的证据[J]. 岩石学报, 2007, 23(6): 1347-1353.
引用本文: 张宏飞 徐旺春 郭建秋 宗克清 蔡宏明 袁洪林. 冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成:新特提斯洋早侏罗世俯冲作用的证据[J]. 岩石学报, 2007, 23(6): 1347-1353.
ZHANG HongFei, XU WangChun, GUO JianQiu, ZONG KeQing, CAI HongMing, and YUAN HongLin. Zircon U-Pb and Hf isotopic composition of deformed granite in the southern margin of the Gangdise terrane, Tibet: Evidence for early Jurassic subduction of Neo-Tethyan oceanic slab[J]. Acta Petrologica Sinica, 2007, 23(6): 1347-1353.
Citation: ZHANG HongFei, XU WangChun, GUO JianQiu, ZONG KeQing, CAI HongMing, and YUAN HongLin. Zircon U-Pb and Hf isotopic composition of deformed granite in the southern margin of the Gangdise terrane, Tibet: Evidence for early Jurassic subduction of Neo-Tethyan oceanic slab[J]. Acta Petrologica Sinica, 2007, 23(6): 1347-1353.

冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成:新特提斯洋早侏罗世俯冲作用的证据

  • 基金项目:

    国家自然科学基金(40521001)、教育部长江学者和创新团队发展计划(IRT0441)和中国地质调查局西藏冲江矿调项目资助.致谢 感谢两位评审者对本文提出的宝贵意见.

Zircon U-Pb and Hf isotopic composition of deformed granite in the southern margin of the Gangdise terrane, Tibet: Evidence for early Jurassic subduction of Neo-Tethyan oceanic slab

  • 本文对产于冈底斯南缘一个变形花岗岩进行了主量元素、微量元素、原位锆石LA-ICP-MS U-Pb定年和锆石Hf同位素组成研究.结果表明,变形花岗岩为高硅(SiO2=73.38%~76.06%)钙碱性岩系,K2O/N%0=0.69.1.17.铝指数(A/CNK)=1.03~1.07,为弱过铝质岩石.变形花岗岩微量元素组成显示贫大离子亲石元素(e.g.Rb=47×10^-6~71×10^-6)和高场强元素(e.g.Nb=1.31×10^-6~-3.09×10^-6,Ta=0.23×10^-6 ~0.54×10^-6),具有岛弧型花岗岩的地球化学属性.变形花岗岩锆石U-Pb年龄为178±1Ma,该年龄代表岩浆结晶年龄.锆石Hf同位素组成显示εHf(178Ma)值变化于+14.1~+17.7,表明变形花岗岩岩浆来自初生地壳物质的部分熔融.变形花岗岩的岩石成因与新特提斯洋向欧亚板块南缘的俯冲消减作用存在联系,其岩浆结晶年龄反映了新特提斯洋发生俯冲消减的开始时代不晚于早侏罗纪,说明了新特提斯洋经历了较长时间的演化.
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修回日期:  2007-02-09
刊出日期:  2007-06-30

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