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地质论评  2011 

伊犁地区果子沟南华系塔里萨依组冰碛岩顶部花岗斑岩年龄及其意义

Keywords: 新疆,果子沟,南华系,冰碛岩,SHRIMPUPb年龄

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Abstract:

西天山东北段伊犁地区的果子沟―科古琴剖面发育了新元古代3套冰碛岩,自下而上为库鲁铁列克提组(下冰碛岩)、别西巴斯套组(中冰碛岩)和塔里萨依组(上冰碛岩)。前人研究认为塔里萨依组冰碛岩与库鲁克塔格地区的汉格尔乔克组对比。本文报道了侵入于塔里萨依组顶部的花岗斑岩中岩浆锆石?206Pb/238U?年龄为(642±5)Ma,应代表花岗斑岩的形成时代。尽管该年龄为花岗斑岩侵位年龄,但可限定果子沟剖面塔里萨依组冰碛岩的沉积上限。由于区内有库鲁铁列克提组(下冰碛岩)和别西巴斯套组(中冰碛岩),可分别对比于库鲁克塔格地区的贝义西组和阿勒通沟组冰碛岩,故推测塔里萨依组冰碛岩应与特瑞艾肯组冰碛岩对比而不是前人认为的与库鲁克塔格地区汉格尔乔克冰碛岩对比。所以,本文为西天山果子沟剖面新元古代冰期地层的时代划分及其与库鲁克塔格地区的对比提供了新的证据。

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