摘要
白银地区火山—沉积岩系为大陆裂谷火山作用的产物。震旦系火山喷发旋回划分为13个喷发韵律和3个喷发亚旋回,成岩环境为半深海相沉积环境,具古陆壳陆内初始裂谷阶段背景;寒武系火山喷发旋回划分为13个喷发韵律和两个喷发亚旋回,黑茨沟组的成岩环境为半深海相沉积环境,是继震旦纪白银岩群后陆壳进一步拉张裂解的产物,代表了裂谷的发展阶段,香毛山组具海底扩张阶段的大陆边缘裂谷沉积背景。
The volcanic . sedimentary rocks in Baiyin area is the product of mainland rift＇s volcanism. The Sinian volcanic eruption cycle is divided into 13 eruption rhythm and three-eruption cycle, whose diagenetic environment is the semi-deep-sea sediments environment, and is in the initial rift stage background of ancient continental crust; The Cambrian volcanic eruption cycle is divided into 13 eruption of rhythm and two-eruption cycle, and the diagenetic environment of Heicigou group is the semi-deep-sea sediments environment, which is the product of the continental crust cracking further extension after the Sinian Baiyin rock group, and is on behalf of the rift development stage. The sedimentary background of Xiangmaoshan group is in the seafloor spreading rift stage of the continental margin.
出处
《甘肃地质》
2009年第1期12-20,共9页
Gansu Geology
基金
<兰州市>幅1:25万区域地质调查项目成果(项目编号:J6.2.7)
关键词
白银地区
火山—沉积岩系
岩相学
成岩环境
Baiyin area
vocanic-sedimentary framework
petrography
diagenesis environment
