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地质通报  2007 

吉林中部漂河川镁铁-超镁铁质杂岩带的特征:对华北东北缘构造带性质和演化的约束

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Keywords: 镁铁-超镁铁质岩锆石SHKIMPU―Pb定年造山作用大陆边缘裂谷吉林中部

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Abstract:

漂河川镍矿的辉长岩锆石SHRIMPU-Pb定年给出了222Ma±8Ma的年龄,表明其形成于晚三叠世.研究结果表明,该岩体不属于蛇绿岩的成员,而是热侵位的镁铁-超镁铁质岩,侵位时代在区域性的变质变形事件之前.结合地球化学资料、相邻地区的大地构造相及热年代学的研究结果,认为区域上的造山作用主幕很可能发生在中生代,而不是原来认为的二叠纪末.漂河川和相关地区的镁铁-超镁铁质岩应该形成于碰撞造山之前,很可能属于大陆边缘裂谷性质.

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