宁夏香山群沉积相与相模式分析  

SEDIMENTARY FACIES AND MODEL ANALYSIS OF XIANGSHAN GROUP,NINGXIA

作　　者：吕昌国[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：《地层学杂志》2012年第4期815-822,共8页Journal of Stratigraphy

基　　金：中国地质调查局1/25万<吴忠市幅>(J48C003003)区域地质调查(No.2001300004031)

摘　　要：分布于宁夏贺兰山南段至香山的香山群,为早古生代贺兰拗拉槽重要物质记录,研究其沉积相和沉积环境,对宁夏大地构造背景的恢复有重要意义。通过对香山群的岩石地层特征的详细研究,对其沉积相和沉积环境进行了分析。认为香山群为一套巨厚的以浊流为主的深海浊积扇沉积,包括三个向上厚度变薄、粒度变细的退积型(海侵)的层序,显示属贺兰拗拉槽扩展时候的沉积,相组合表明扇顶位于贺兰山南段,阿拉善地块和鄂尔多斯地块为物源供给区。It is distributed on the south of Helan Mountain to the Xiangshan Mountain in Ningxia, the Xiangshan Group is important material records of the Early Paleozoic Helan Pull-slot Bend. To study its sedimentary facies and depositional environment has important significant for recovery of Ningxia tectonic setting. This paper analyzed sedimentary facies and sedimentary environment of the Xiangshan Group by a detailed study for its rock features,got a conclusion that Xiangshan Group is a set of thick deep-sea turbidite fan deposition with turbidity-based, including three upward thinner, finer granularity regressive type （transgression） sequence, showing the deposition of Helan Pull-Slot bend expansion. The facies combinations indicade that the top fan is located in the south of Helan Mountain, Alxa Block and Ordos Block are supplying material source area.

关 键 词：宁夏贺兰山-香山地区 香山群 岩石地层 沉积相 沉积环境 

分 类 号：P534.4[天文地球—古生物学与地层学]