贺兰山中南部香山群地球化学特征及构造沉积背景  

Study on Geochemical Characteristics and Tectonic Sedimentary Background of Xiangshan Group in the Central and Southern Helan Mountain

作　　者：武向峰[1,2] 曹志敏 许淑梅[1] 王千军[2] 夏国清 崔红庄[2] WU Xiangfeng;CAO Zhimin;XU Shumei;WANG Qianjun;XIA Guoqing;CUI Hongzhuang(College of Marine Geosciences,Ocean University of China,Qingdao,Shandong 266100,China;Research Institute of Exploration and Development,Shengli Oilfield of Sinopec,Dongying,Shandong 257100,China;Research Institue of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]中石化股份有限公司胜利油田勘探开发研究院,山东东营257100 [3]成都理工大学沉积地质研究院,四川成都610059 [4]成都理工大学油气藏地质与勘探开发国家重点实验室,四川成都610059

出　　处：《西安石油大学学报（自然科学版）》2020年第2期1-12,共12页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金“东昆仑山新生代构造隆升的碎屑矿物裂变径迹记录”(41402099)。

摘　　要：为了明确贺兰山中南部地区早古生代的构造沉积背景,对香山群硅质岩和碎屑岩区域系统采样,并进行地化特征对比分析,探讨构造背景及沉积环境。研究表明,香山群硅质岩w(A1)/(w(A1)+w(Fe)+w(Mn))均值0.42,w(Fe)/w(Ti)均值33.10,受热液和生物成因的共同作用,北部偏生物成因,南部多热液成因。碎屑岩样品w(Al 2O 3)/w(MnO)均值309,w(Al 2O 3)/w(CaO)均值50.41,w(V)/(w(V)+w(Ni))均值0.74,指示处于陆源碎屑供应充足的厌氧环境。综合w(Fe 2O 3)/w(TiO 2)-w(Al 2O 3)/(w(Al 2O 3)+w(Fe 2O 3))、w(K 2O)/w(Na 2O)-w(SiO 2)/w(Al 2O 3)图解及典型沉积构造分析,认为研究区早古生代为被动大陆边缘斜坡-半深海平原环境,以中卫-青铜峡断裂为界,由北向南水体逐渐变深。In order to clarify the tectonic and sedimentary background of Early Paleozoic in the central and southern Helan Mountain,systematic sampling was carried out in the siliceous rock and clastic rock area of Xiangshan Group,and the geochemical characteristics of the samples were comparatively analyzed to discuss the tectonic background and sedimentary environment of Paleozoic in this area.It is shown that the average of w(A1)/(w(A1)+w(Fe)+w(Mn))of the siliceous rock samples is 0.42,and the average of w(Fe)/w(Ti)is 33.10.Due to the joint action of heating fluid and biogenesis,the northern part of the study area is more biogenic and the southern part is more hydrothermal.The average value of w(Al 2O 3)/w(MnO)of the clastic rock samples is 309,the average value of w(Al 2O 3)/w(CaO)is 50.41,and the average value of w(V)/(w(V)+w(Ni))is 0.74,indicating that the samples are in an anaerobic environment with sufficient supply of terrigenous debris.Based on w(Fe 2O 3)/w(TiO 2)-w(Al 2O 3)/(w(Al 2O 3)+w(Fe 2O 3)),w(K 2O)/w(Na 2O)-w(SiO 2)/w(Al 2O 3)diagrams and the analysis of typical sedimentary structure,it is held that the early Paleozoic in the study area was in a passive continental margin slope-bathyal plain environment,divided by the Zhongwei-Qingtongxia fault,and the water gradually deepens from north to south.

关 键 词：硅质岩 碎屑岩 地球化学 香山群 贺兰山中南部 

分 类 号：TE121[石油与天然气工程—油气勘探]