香山群的解体及地层时代的重新厘定DISINTEGRATION OF THE XIANGSHAN GROUP AND ITS AGE DETERMINATION
谢从瑞,校培喜,由伟丰,曹宣铎,胡云绪,周志强,高晓峰
摘要(Abstract)：
宁夏一带的香山群,由于各种原因,其时代和地层的划分自建立以来一直处于争论不休的状态。产生这种问题的原因最终聚集在两个问题上的分歧:香山群的地层构造和化石产出部位的沉积构造环境分析上。根据野外的实际观察及前人资料的综合分析,香山群的构造并非成简单的单斜排列,各个单元的沉积也各具特征。其中第一和第三亚群(包括徐家圈组第四段)为秦—祁—贺裂陷槽裂陷初期的产物,分布于盆地的东缘,时代为中寒武—晚寒武世;第二亚群(不含徐家圈组第四段)和第四亚群为裂陷槽裂陷中晚期的产物,主要分布于盆地的西北缘,时代为奥陶纪。结合区域地层的综合分析,提出了早古生代贺兰裂陷盆地的沉积充填模式及地层格架。
关键词(KeyWords)： 年代地层;香山群;米钵山组;贺兰裂陷盆地;寒武纪;奥陶纪;秦—祁—贺裂陷槽;宁夏
基金项目(Foundation): 中国石油化工股份有限公司石油勘探开发研究院资助项目
作者(Author): 谢从瑞,校培喜,由伟丰,曹宣铎,胡云绪,周志强,高晓峰
DOI: 10.19839/j.cnki.dcxzz.2010.04.010
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