青藏高原东北缘特提斯构造域界线的探讨

侯青叶[1,2] 赵志丹[1,2] 张本仁 张宏飞 张利 陈岳龙. 青藏高原东北缘特提斯构造域界线的探讨[J]. 岩石学报, 2006, 22(3): 567-577.
引用本文: 侯青叶[1,2] 赵志丹[1,2] 张本仁 张宏飞 张利 陈岳龙. 青藏高原东北缘特提斯构造域界线的探讨[J]. 岩石学报, 2006, 22(3): 567-577.
HOU QingYe, ZHAO ZhiDan, ZHANG BenRen, ZHANG HongFei, ZHANG Li,CHEN YueLong. On the boundary of Tethyan tectonic domain on northeastern margin of the Tibetan Plateau[J]. Acta Petrologica Sinica, 2006, 22(3): 567-577.
Citation: HOU QingYe, ZHAO ZhiDan, ZHANG BenRen, ZHANG HongFei, ZHANG Li,CHEN YueLong. On the boundary of Tethyan tectonic domain on northeastern margin of the Tibetan Plateau[J]. Acta Petrologica Sinica, 2006, 22(3): 567-577.

青藏高原东北缘特提斯构造域界线的探讨

  • 基金项目:

    国家自然科学基金项目(No.40234052)和国家重点基础发展规划项目(2002CB412603)资助.

On the boundary of Tethyan tectonic domain on northeastern margin of the Tibetan Plateau

  • 东特提斯构造域北界的确定不仅可以约束构造域的范围及演化,而且对于约束中国各陆块的原始构造归属也有着非常重要的意义.本文将从地球化学角度对这一科学问题进行探讨.祁连造山带早古生代蛇绿岩单元内枕状玄武岩的元素、Sr-Nd-Pb同位素组成系统研究表明:其地幔源区的Nd和Pb同位素组成均表现出印度洋MORB型同位素组成特征;枕状玄武岩(△^207Pb/^204Pb)t变化范围为9.1~24.3(平均值为14.7),(△^208/^204Pb)t变化范围为9.1~101.1(平均值55.3);与古特提斯和新特提斯蛇绿岩具有一致的同位素组成.因此,祁连造山带古洋幔应属于原特提斯构造域.纵观中国境内的特提斯构造域蛇绿岩的分布特征可知:该构造域表现出自北而南变年轻的时空演化规律,从而说明中央造山带的动力学过程也应纳入冈瓦纳大陆裂解和亚洲增生的总动力学系统之中.
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出版历程
收稿日期:  2005-12-01
修回日期:  2006-02-15
刊出日期:  2006-03-31

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