李锦轶, 和政军, 莫申国, Andrey A. Sorokin. 大兴安岭北部绣峰组下部砾岩的形成时代及其大地构造意义[J]. 地质通报, 2004, 23(2): 120-129.
    引用本文: 李锦轶, 和政军, 莫申国, Andrey A. Sorokin. 大兴安岭北部绣峰组下部砾岩的形成时代及其大地构造意义[J]. 地质通报, 2004, 23(2): 120-129.
    LI Jinyi, HE Zhengjun, MO Shenguo, Andrey A. Sorokin. The age of conglomerates in the lower part of the Xiufeng Formation in the northern Da Hinggan Mountains, NE China, and their tectonic implications[J]. Geological Bulletin of China, 2004, 23(2): 120-129.
    Citation: LI Jinyi, HE Zhengjun, MO Shenguo, Andrey A. Sorokin. The age of conglomerates in the lower part of the Xiufeng Formation in the northern Da Hinggan Mountains, NE China, and their tectonic implications[J]. Geological Bulletin of China, 2004, 23(2): 120-129.

    大兴安岭北部绣峰组下部砾岩的形成时代及其大地构造意义

    The age of conglomerates in the lower part of the Xiufeng Formation in the northern Da Hinggan Mountains, NE China, and their tectonic implications

    • 摘要: 对漠河盆地南缘绣峰组下部砾岩的野外观察,发现其碎屑物除了主要来源于被前人置于新元古代的花岗岩外,还含有火山岩砾石;与上部砂岩之间被断层分隔而不是连续沉积。作为该砾岩主要源岩的花岗岩中的锆石蒸发法年龄为354~164Ma,锆石SHRIMP定年揭示其最后一次岩浆活动可能发生在早侏罗世(180~190Ma);全岩-长石-黑云母内部Rb-Sr等时线年龄为177~191Ma,黑云母Ar-Ar年龄为171~175Ma,表明该岩基在中侏罗世还深埋地下没有出露地表。其中的火山岩砾石的岩石学和岩石化学特征与区域上晚侏罗世塔木兰沟组火山岩类似。结合区域地质资料,推测该砾岩的形成时代不是中侏罗世,而可能是早白垩世;漠河盆地是与蒙古-鄂霍茨克造山带有关的前陆盆地,而不是侏罗纪陆内断陷盆地。

       

      Abstract: Field investigations into conglomerate in the lower part of the Xiufeng Formation on the southern margin of the Mohe basin have revealed that clastic materials in conglomerate also include volcanic pebbles in addition to granitic pebbles reported previous

       

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