塔里木盆地小海子剖面沉积特征及演化

塔里木盆地巴楚地区小海子剖面是盆地石炭系出露最全最好的地区,对该剖面的研究将有助于解析该套地层.根据野外观察、室内分析,认为小海子剖面上泥盆统-石炭系主要为一套浅海相沉积体,下部主要发育浪控碎屑滨岸,中部为开阔台地、潟湖、局限台地等混积环境,上部为一套厚层的蒸发台地环境膏岩,顶部则呈现出混积的局限台地特征.结合盆地地层展布和构造演化,认为小海子剖面上泥盆系-上石炭统沉积自下而上可分为碎屑岩、混积、膏岩、混积四个演化阶段.

Sedimentary Characteristics and Evolution of the Xiaohaizi Section in Tarim Basin

The Xiaohaizi section in Bachu area of Tarim basin is one of the most complete and best exposed areas of Carboniferous in the basin, and the study of this section will help to understand this stratum. According to field observation and analysis, it is considered that the Upper Devonian - Carboniferous of the Xiaohaizi section is mainly a set of shallow sea facies sedimentary bodies. The lower part is mainly developed with wave-controlled clastic shore deposits; the middle part is dominated by open platform, lagoon and restricted platform environment; the upper part is mainly composed of thick-bedded of evaporation platform gypsum; the top part shows the restricted platform characteristics of mixed carbonate and siliciclastic sediments. Combined with the stratigraphic distribution and tectonic evolution of the basin, it is considered that the Upper Devonian - Carboniferous sediments in the Xiaohaizi section can be divided into four stages from bottom to top: clastic rock, mixed deposit, gypsum rock and mixed deposit.