论文部分内容阅读
新疆塔里木板块西北缘阿克苏—乌什地区寒武纪最早期玉尔吐斯组海相地层不整合超覆于埃迪卡拉纪奇格布拉克组之上,是区域海进的标志。蓬莱坝和肖尔布拉克剖面的玉尔吐斯组下部为暗色含磷硅质岩夹薄层白云质灰岩,中部为黑色碳质泥岩、页岩、粉砂岩夹白云岩,上部为瘤状白云岩夹泥岩,这一序列显示玉尔吐斯组海进沉积的早期就迅速出现了还原环境下沉积的黑色岩系,而玉尔吐斯组上部的碳酸盐岩与之上肖尔布拉克组含三叶虫碳酸盐岩具有很高的相似度,属极浅海带频繁出现的蒸发云坪环境。这个相变序列显示玉尔吐斯组早期还原条件下的黑色岩系以及之后蒸发条件下的碳酸盐岩沉积均发生在浅海区乃至极浅水区,玉尔吐斯组—肖尔布拉克组序列中的水深变化幅度有限。
The unconformity of the marine strata in the earliest Tertullian Cambrian of the Aksu-Wushi region on the northwestern margin of the Tarim plate in the Tarim plate overrides the Edicala-Quechibulak Formation and is a sign of regional sea-going. The lower part of the Yurtusi Formation in the Penglai Dam and Shoal-Bulake section is a dark dolomitic limestone with a dark phosphorous-bearing siliceous rock clip. The middle part is a black carbonaceous mudstone, shale and siltstone with dolomite in the upper part, Dolomite mudstone, this sequence shows that the early Yurtuitesu depositional sediments rapidly deposited under the reducing environment of black rock series, while the upper Yushituosi carbonate rocks and the Shoal cloth Lak group trilobite carbonate rock has a high degree of similarity, is a very shallow kelp evaporative cloud Ping environment. This phase change sequence shows that the black rock series under the early reduction conditions of the Yü Tuusi Formation and the carbonate sediments under the evaporation conditions all occurred in the shallow sea areas and even in shallow water areas. The Yurbiusi-Shorburak Formation The water depth in the sequence varies only marginally.