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地质学报  2004 

西昆仑康西瓦加里东期孔兹岩系及地质意义

, PP. 733-743

Keywords: 加里东期,孔兹岩,康西瓦,西昆仑

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Abstract:

在青藏高原西昆仑地体南部的元古宙片麻岩穹窿南侧,发育一条近EW向规模巨大的康西瓦韧性走滑剪切带,韧性剪切带岩石由7km宽的糜棱岩化的孔兹岩系组成,孔兹岩原岩为富铝质泥质沉积岩夹火山岩及大理岩。孔兹岩系的MORB标准化微量元素蛛网图显示了其为富铝泥质沉积岩,具有明显的Th正异常及Ce、Zr等大离子的正异常,而变质火山岩中出现Nb、Zr正异常;稀土元素含量展示上述两类岩石均具轻稀土相对富集、重稀土相对亏损及Eu中度亏损的特性。康西瓦孔兹岩形成的温度为700℃,压力6.8GPa。锆石SHRIMP同位素年代测试表明,孔兹岩的碎屑锆石来源于644~873Ma或更老的周缘古老变质基底剥蚀区,孔兹岩形成于加里东期(428~445Ma),并遭受印支期(250~210Ma)强烈的剪切应变。康西瓦孔兹岩的原岩、微量元素与稀土元素特征、形成的温-压条件以及生成时代等与南阿尔金孔兹岩系可以类比,表明西昆仑地体与阿尔金地体可能原为同一地体。中国已发现的孔兹岩系绝大部分为太古宙及元古宙的产物,西昆仑与阿尔金加里东期孔兹岩的发现不仅显示了加里东造山带山根的存在,而且提出沿阿尔金断裂系左行平移600km的新证据。

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