摘要
偏岭地区大石桥组三段自下而上分为6个岩性层,每层都有不同的岩性组合特征.碳酸盐岩的CaO/MgO比值具有指示沉积环境的作用.通过分析该段地层的岩性组合特征,并结合不同层位的CaO/MgO比值,推断出偏岭地区在晚大石桥期的沉积环境演变过程为干旱湖、封闭海湾→开阔浅海→滨海→干旱湖、封闭海湾→浅海(偶为潮间或滨岸)→滨海、浅海交互环境.
The 3rd member of Paleoproterozoic Dashiqiao formation in Pianling, Xiuyan County, Eastern Liaoning can be subdivided into 6 lithologic layers, each of which has different characters of lithologic assemblage. The CaO / MgO ratio of carbonate rock is an indicator for sedimentary environment. With analysis on the characters of lithologic assemblage and the CaO/MgO ratio of each layer, it is inferred that the sedimentary environment of Late Dashiqiao age in Pianling area was evolved in the process of arid lagoon and closed bay - open shallow sea - shore - arid lagoon and close bay - shallow sea （occasionally intertidal zone or shore） - alternative of shore and shallow sea.
出处
《地质与资源》
CAS
2008年第3期166-169,共4页
Geology and Resources
关键词
大石桥组三段
沉积环境
构造古地理
辽宁
the 3rd member of Dashiqiaoformation
sedimentaryenvironment
tectono-paleogeography
LiaoningProvince
