宁夏贺兰山—固原地区寒武系地层格架特征  

Characteristic of Cambrian stratigraphic framework in Helan mountain and Guyuan area in Ningxia

作　　者：毛自力 马学东 

机构地区：[1]宁夏回族自治区地质调查院,宁夏银川750021

出　　处：《宁夏工程技术》2012年第3期197-200,共4页Ningxia Engineering Technology

基　　金：1:50000迎盘水幅;甘塘幅;白墩子幅;白疙瘩幅区域地质调查项目(1212010510409)

摘　　要：区域资料研究表明,早寒武世,宁夏贺兰山地区经历了前寒武纪长期隆起后开始下降,接受滨海浅滩相、碳酸岩盐潮坪相沉积.至中晚寒武世,鄂尔多斯西缘海侵不断扩大,呈现为开阔陆棚海,沉积环境由滨海浅滩相向潮坪相、台地边缘浅滩相、陆棚内缘斜坡相过渡,沉积中心转移至贺兰中段.通过对贺兰山地区寒武纪沉积地层特征、沉积相及古生物群时代分析对比,将寒武纪地层划分为早期海侵体系域(TST1)、中期海侵体系域(TST2)和高水位体系域(HST),其中,TST2与HST被饥饿段(SS)开分.Studies of regional geology material show that Helan mountain area has experienced long-term uplift in Preeambrian, and then, has began to decline and has deposited the sediments of littoral shoal facies and carbonate tidal flat facies since the Early Cambrian period. To the Middle and Late of Cambrian, the transgressive area of Ordos western margin expanded continually, and rendered as an extensive continental shelf sea. At the same time, depositional environment changed from littoral shoal facies to tidal flat facies, shoal facies on edge of platform and slope facies of the continental shelf inner edge, the center of the deposition transferred to the middle of the Helan mountain. By contrast of the characteristics of sedimentary strata, sedimentary facies and palaeobiota of Cambrian in Helan mountain area, Cambrian strata can be divided into early transgressive system tract （TST1）, medium transgressive system tract （TST2） and high-stand system tract （HST）. Early transgressive system tract and medium transgressive system tract was separated by starved section（SS）.

关 键 词：宁夏 贺兰山地区 寒武纪 地层格架 

分 类 号：P535[天文地球—古生物学与地层学]