青海省兴海县日龙沟—赛什塘一带地质构造格架及其意义
Geologic Space Planes and Their Significance of Rilonggou-Saishitang Region, Xinghai County, Qinghai Province
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摘要: 青海省兴海县日龙沟—赛什塘一带,位于东昆仑布青山—阿尼玛卿洋北侧呈北北东向展布的华力西期苦海—赛什塘分支洋的中段.在该分支洋盆的扩张、俯冲消减以至闭合阶段,形成了一系列呈北北西向及北东东向展布并以断裂构造为主的地质构造.这些地质构造的影响波及该分支洋中一系列次级沉积盆地的发育与展布,控制着发生于其中的早二叠世火山-沉积矿床的形成与分布.印支期受这些地质构造脆弱地带控制而分布的中酸性侵入岩的产出,印证了上述地质构造的存在及展布特点.为该区地质构造格架的研究和该区的进一步找矿提供了启示.Abstract: Rilonggou-Saishitang region in Xinghai county,Qinghai province,lies in the north of Buqingshan-Animaqing ocean and is connected to the middle region of Hercynian Kuhai-Saishitang branch ocean through the NNE spreading.In the expansion,subduction and closure stage of the branch oceanic basin,a series of NNW and NEE distribution,main tectonic faults were formed.The effects of the geological structures spread to the development of a series of sedimentary basin and the distribution in the branch oceanic basin controling the formation and distribution of the Early Permian volcanic-formation sedimentary deposits.The existence and distribution characteristics of the above geological structure were confirmed by the acidity intrusive rock out put from the Indo-Chinese time fragile geological structure.It provids further inspiration for the sTructural framework and geological research in this area.
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Key words:
- Rilonggou-Saishitang /
- basic structural framework /
- sedimentary basin
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