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宁夏香山—青龙山地区奥陶纪地层格架分析
引用本文:吕昌国,白生明,张玲燕,李红霞.宁夏香山—青龙山地区奥陶纪地层格架分析[J].西北地质,2009,42(4):76-83.
作者姓名:吕昌国  白生明  张玲燕  李红霞
作者单位:宁夏回族自治区地质环境监测总站,宁夏,银川,750021
基金项目:25万吴忠市幅(J48 C 003 003)区域地质调查;项目编号 
摘    要:区域资料表明,早奥陶世宁夏香山—青龙山地区为开阔的浅海台地,接受了台地相碳酸盐岩沉积。至早奥陶世晚期,由于贺兰拗拉槽重新裂陷,该区古地理面貌及沉积环境发生了显著变化,西部香山地区转化为大陆斜坡—次深海、深海盆地,而东部青龙山地区虽海水深度较前期有明显加大,但仍继承了早期台地性质。通过对香山、米钵山、牛首山、罗山及青龙山等地奥陶纪沉积地层特征、沉积相及生物群时代的对比分析,依据地层结构及关键界面鉴定,将奥陶纪地层划分为早期高水位体系域(HST1)、低水位楔(LSW)、海侵体系域(TST)和晚期高水位体系域(HST2)4个沉积体系域。其中,HST1与LSW之间被I型不整合面(SBI)分开;TST与HST2之间被饥饿段(SS)分开。

关 键 词:宁夏香山—青龙山地区  奥陶纪  沉积相  地层格架

Analysis on Ordovician Period Stratigraphic Framework in Xiangshan-Qinglongshan Area,Ningxia
LU Chang-guo,BAI Sheng-ming,ZHANG Ling-yan,LI Hong-xia.Analysis on Ordovician Period Stratigraphic Framework in Xiangshan-Qinglongshan Area,Ningxia[J].Northwestern Geology,2009,42(4):76-83.
Authors:LU Chang-guo  BAI Sheng-ming  ZHANG Ling-yan  LI Hong-xia
Institution:(General Station of Geological and Environmental monitoring of Ningxia Hui Autonomous Region, Yinchuan 750021, Ningxia , China)
Abstract:Regional data indicate that Xiangshan-Qinglongshan area was a shallow open mesa in the early Ordovician Period, and they accepted the platform facies carbonate deposition. To early Ordovician later period, because the Helan aulacogen crack fell again, the ancient geography appearance and the environment of deposition in this area had the remarkable change, the western Xiangshan region turned into continental slope-times of deep-sea, deep-sea basin, and the water depth of the eastern (Qinglongshan region) had more significantly increased than previous period, but it still inherited nature of the early platform. By comparating and analyzing the characteristics of Ordovician sedimentary strata, sedimentary facies and biota period of Xiangshan, Miboshan, Niushou Hill, Luoshan and Qinglongshan etc. , and based on stratigraphic structure and identification of key interface, we divide the Ordovician period stratum into four depositional system domains: the early highstand systems tract (HST1), lowstand wedge (LSW), the transgressive systems tract (TST), and the late highstand systems tract (HST2), of which, HST1 and LSW are separated by I type unconformity (SB1); TST and HST2 are separated by hunger paragraph (SS).
Keywords:Ningxia Xiangshan-Qinglongshan region  Ordovician period  sedimentary facies  stratigraphic framework
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