OALib Journal期刊
ISSN: 2333-9721
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漠河盆地上侏罗统物源分析及其地质意义
Keywords: 漠河盆地,上侏罗统,物源分析,前陆盆地
Abstract:
为了探讨晚侏罗世漠河盆地的构造类型,笔者等对其物源特征进行了系统分析。通过古水流分析、母岩成分分析和源区构造背景分析认为:①晚侏罗世漠河盆地的物源来自南北两个方向;②北部物源区位于西伯利亚板块南缘,为蒙古―鄂霍茨克造山带,母岩成分主要为花岗岩、变质岩、中酸性火山岩、中基性火山岩和沉积岩;③南部物源区位于大兴安岭北部,为下伏板块基底,母岩成分主要为花岗岩、变质岩和沉积岩;④北部造山带物源区的构造背景为早中生代的活动大陆边缘。晚侏罗世漠河盆地具有典型前陆盆地的双向物源特征,一方面来自北部造山带,一方面来自盆地下伏板块基底。根据物源特征、区域大地构造背景和俄罗斯上阿穆尔盆地(黑龙江在俄罗斯称为阿穆尔河)有关资料认为晚侏罗世漠河盆地可能为漠河―上阿穆尔周缘前陆盆地的南半部分,其形成和演化受蒙古―鄂霍茨克造山带制约。
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