青藏高原龙木错-双湖板块缝合带闭合的年代学证据——来自果干加年山蛇绿岩与流纹岩Ar-Ar和SHRIMP年龄制约

李才 翟庆国 陈文 董永胜 于介江. 青藏高原龙木错-双湖板块缝合带闭合的年代学证据——来自果干加年山蛇绿岩与流纹岩Ar-Ar和SHRIMP年龄制约[J]. 岩石学报, 2007, 23(5): 911-918.
引用本文: 李才 翟庆国 陈文 董永胜 于介江. 青藏高原龙木错-双湖板块缝合带闭合的年代学证据——来自果干加年山蛇绿岩与流纹岩Ar-Ar和SHRIMP年龄制约[J]. 岩石学报, 2007, 23(5): 911-918.
LI Cai, ZHAI QingGuo , CHEN Wen , DONG YongSheng and YU JieJiang. Geochronology evidence of the closure of Longmu Co-Shuanghu suture,Qinghai-Tibet plateau: Ar-Ar and zircon SHRIMP geochronology from ophiolite and rhyolite in Guoganjianian[J]. Acta Petrologica Sinica, 2007, 23(5): 911-918.
Citation: LI Cai, ZHAI QingGuo , CHEN Wen , DONG YongSheng and YU JieJiang. Geochronology evidence of the closure of Longmu Co-Shuanghu suture,Qinghai-Tibet plateau: Ar-Ar and zircon SHRIMP geochronology from ophiolite and rhyolite in Guoganjianian[J]. Acta Petrologica Sinica, 2007, 23(5): 911-918.

青藏高原龙木错-双湖板块缝合带闭合的年代学证据——来自果干加年山蛇绿岩与流纹岩Ar-Ar和SHRIMP年龄制约

  • 基金项目:

    国家自然科学基金(40672147)与中国地质调查局(1212010561605,200313000015,)项目资助.致谢 研究工作得到北京离子探针中心刘敦一研究员、阎全人研究员、张巧大女士、苏犁博士、宋述光博士大力支持与帮助,在此表示诚挚谢意.感谢两名审稿人提出的宝贵意见.

Geochronology evidence of the closure of Longmu Co-Shuanghu suture,Qinghai-Tibet plateau: Ar-Ar and zircon SHRIMP geochronology from ophiolite and rhyolite in Guoganjianian

  • 青藏高原龙木错-双湖板块缝合带从碰撞缝合何时转为羌塘盆地的沉积基底并接受沉积,一直受到地学界密切关注.羌塘中部的果干加年山主脊首次发现未变质的沉积岩以角度不整合覆盖于蛇绿混杂岩岩之上,上覆地层底部流纹岩夹层锆石SHRIMP U-Pb年龄为214±4Ma,为沉积盖层提供了可靠的年龄依据;不整合面之下强烈变形的阳起片岩(变质玄武岩)中阳起石Ar-Ar年龄为219.7±6.5Ma,与羌塘中部龙木错-双湖高压变质带获得的榴辉岩多硅白云母、蓝闪石等Ar-Ar变质年龄一致.Ar-Ar和SHRIMP定年结果表明该角度不整合的时限为220-214Ma之间.角度不整合上下岩石的定年研究,为龙木错-双湖缝合带的闭合提供了确切的时间约束:羌塘地区冈瓦纳与欧亚(扬子)板块在214Ma以前实现了闲合,古特提斯消亡,进入陆表海演化阶段.
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修回日期:  2006-12-20
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