宁夏贺兰山地区石炭纪沉积环境演化规律探讨  

Environmental evolution rules of Carboniferous strata in Helan Mountains area in Ningxia

作　　者：李红霞[1] 白生明[1] 金学强[1] 胡志瑞[1] 

机构地区：[1]宁夏回族自治区国土资源调查监测院,宁夏银川750004

出　　处：《宁夏工程技术》2012年第3期201-205,共5页Ningxia Engineering Technology

摘　　要：通过对石炭纪地层单元的岩石特征、沉积特征和层序结构分析,认为宁夏贺兰山地区石炭纪地层发育良好,层序连续,其岩石地层序列自下而上可划分为土坡组和太原组;岩石组合以陆源碎屑岩、泥质岩和碳酸盐岩沉积为主;贺兰山地区石炭系沉积相演化序列总体呈后退型浅水三角洲沉积层序;在晚石炭世到早二叠世,三角洲体系的沉积构成样式发生了明显变化,反映出早期受波浪作用较强、中期潮汐作用明显、晚期河流作用迅速增强的沉积演化规律.Analysis of characteristics of the rocks of Carboniferous strata unit, the structure of sedimentary features and sequence shows that Carboniferous strata developed well and sequence continuously in Helan Mountains area, and litbostratigraphic sequences from bottom to up can be divided into the Tupo Fm and the Taiyuan Fm. The rock association mainly consists of terrigenous clastic rock, argillaceous rock and carbonate rock sedimentary. As to the rock characteristics, stratigraphic sequence, facies and environment evolution characteristics, Helan Mountains area of carboniferous sedimentary evolution of the sequence is a retreat-type shallow water delta sedimentary sequence in the genera]. In the late carboniferous to the early Permian, constituent style of deposition has changed significantly in the delta system, it shows a rule that there is strong wave action in early stage, tidal effects become obvious in middle stage, and fluvial sedimentary evolution increases rapidly in late stage.

关 键 词：贺兰山地区 石炭纪 岩石特征 地层层序 沉积环境 演化规律 

分 类 号：P534.45[天文地球—古生物学与地层学]