碎屑岩与碳酸盐岩混合沉积模式——以新疆塔西南地区上石炭统卡拉乌依组为例

Mixed sedimentary model of clastic rocks and carbonate rocks: a case study of Karawuyi Formation of Upper Carboniferous in southwest Tarim, Xinjiang

韩睿 张尚锋 罗顺社 李勇 杨芝林 巩高阳

长江大学地球科学学院，湖北 武汉 430000 2．中国石油塔里木油田分公司勘探开发研究院，新疆 库尔勒 841000

School of Geoscience, Yangtze University, Wuhan 430000, China Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China

塔西南地区阿尔塔什剖面上石炭统卡拉乌依组广泛发育碎屑岩与碳酸盐岩混合沉积，文中通过野外剖面实测和镜下薄片鉴定，对阿尔塔什剖面上石炭统卡拉乌依组的混合沉积特征进行了详细研究。研究表明：研究区混合沉积特征为碎屑岩与碳酸盐岩的层序混积以及陆源碎屑与碳酸盐岩的结构组分混积；混积层序类型主要有碎屑岩￣碳酸盐岩混积层序、碎屑岩￣混积岩混积层序、碳酸盐岩￣混积岩混积层序3种；混积岩类型主要有灰质细砂岩、灰质粉砂岩、含砂生屑鲕粒灰岩和含砂生屑灰岩4种。根据混积岩岩石学特征及混积层序特点，结合当时的沉积环境，对混合沉积成因及控制因素进行了探讨，建立了混合沉积模式。

Mixed sedimentations of clastic rocks and carbonate rocks are widely developed in the Upper Carboniferous Karawuyi Formation of Altash section in southwest Tarim. In this paper, the mixed sedimentations of the Upper Carboniferous Aarawuyi Formation in Altash section are studied in detail through field profile measurement and microscopic thin section identification. The study shows that the mixed sedimentary characteristics in the study area are sequence mixing of clastic rocks and carbonate rocks and structure component  mixing of terrigenous clastic rocks and carbonate rocks. There are three types of mixed sedimentary sequence: clastic and carbonate rocks mixed sequence, clastic rocks and migmatite mixed sequence and carbonate rocks and migmatite mixed sequence. There are four types of migmatite: calcareous fine sandstone, calcareous siltstone, sandy bioclastic oolitic limestone and sandy bioclastic limestone. According to the petrological characteristics of migmatite and the characteristics of mixed sedimentary sequence, combined with the sedimentary environment at that time, the genesis and controlling factors of mixed sedimentation are discussed, and the mixed sedimentary model is established.

10.6056/dkyqt202302012