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色日绒地区冰海杂砾岩产于砂泥质为主的陆缘碎屑岩段中,累计出露厚度约325 m。岩石学及沉积学特征指示其沉积于滨海—上部浅海环境;顶部的化石生物组合指示此段岩层沉积于晚石炭世—早二叠世的冷水型海洋环境。岩层中的坠石结构、压裂面以及与其同层位产出的冷水型生物群为冰海杂砾岩的成因提供了有力的证据,指示其形成于冰川作用下,是由冰筏搬运的海相沉积。通过资料综合收集、对比,确定了冰海杂砾岩形成的古构造及古地理、古气候控制条件。根据古构造位置及古地理特征,大致总结出了以该地区为代表的冈瓦纳相冰海杂砾岩的沉积及成因模式。
The ice-sea conglomerate in the Xishilong area is mainly produced in sandy mudstone-dominated continental clastic rocks with a cumulative exposure of about 325 m. Petrology and sedimentology indicate that it was deposited in the coastal-upper shallow marine environment. The fossil assemblage on the top indicates that the rock was deposited in the Late Carboniferous-Early Permian cold-water marine environment. The pendant structures, fractured surfaces and the cold-water biota from the same formation in the strata provide strong evidence for the genesis of glacial conglomerates, indicating that they were formed by glaciers and transported by ice rafts Marine deposition. Through the comprehensive collection and comparison of data, the ancient tectonic, palaeogeographical and paleoclimate control conditions of the ice-sea conglomerate are determined. According to paleocontinental tectonic location and palaeogeographical features, the deposition and genesis pattern of Gondwanian ice-sea conglomerate represented by this area are summarized.