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沉积学报  2015 

西天山早石炭世构造环境:大哈拉军山组底部沉积地层学证据

DOI: 10.14027/j.cnki.cjxb.2015.03.004, PP. 459-469

Keywords: 西天山,大哈拉军山组,早石炭世,沉积相,后碰撞裂谷

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Abstract:

西天山伊犁地区广泛出露早石炭世大哈拉军山组火山—沉积岩系,其内赋存了金、铁、铜等重要的金属矿床。但迄今为止,关于大哈拉军山组形成构造环境还存在很大的争议。通过区域地层对比,研究区大哈拉军山组与下伏地层之间存在区域性角度不整合接触关系。其底部自下而上依次发育砾岩、粗砂岩、砂岩、粉砂岩、泥岩、碳酸盐岩、安山岩。沉积学和层序序列分析显示,该组底部的陆源碎屑岩建造组合形成于扇三角洲沉积环境,进一步可划分出扇三角洲平原、扇三角洲前缘和前扇三角洲3个亚相,向上出现的碳酸盐岩形成于浅海碳酸盐岩台地环境。这种沉积物由粗到细、水体由浅到深,沉积环境由陆相变为海相的地层充填序列,反映了一种裂陷拉伸的动力学背景。因此,西天山早石炭世大哈拉军山组火山—沉积建造形成于后碰撞裂谷环境。

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