山东胶莱盆地构造变形及形成演化——以王氏群和大盛群变形分析为例
Tectonic deformation and formation and evolution of the Jiao-Lai basin,Shandong:A case study of a deformation analysis of the Wangshi and Dasheng Groups
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摘要: 胶莱盆地是形成于中生代晚侏罗世的陆相盆地，构造变形较为复杂。在野外断裂构造变形观测的基础上，结合年代学数据和地层沉积序列，确立了胶莱盆地白垩纪的变形演化历史。总体上，胶莱盆地在形成和演化过程中沉积了3套地层，经历了多个构造变形阶段。其中，发生在白垩纪的变形阶段主要有：(1)早白垩世早期，鲁东地区受区域近E—W向引张应力场控制，胶莱盆地发生大规模的火山喷发，喷发间歇期沉积了大盛群；早白垩世晚期，受强烈的区域性NW—SE向挤压，胶莱盆地褶皱回返。(2)晚白垩世早期，在区域近S—N向引张应力作用下，诸城断陷盆地发育，王氏群沉积；晚白垩世晚期，胶莱盆地受区域性NE—SW向挤压，导致王氏群褶皱变形。Abstract: The Jiao-Lai basin is a Late Cretaceous continental basin,which experienced complex tectonic deformation.Based on field observations of faults,combined with chronological age data and sedimentary sequences,the authors have established the Cretaceous history of formation and evolution of the Jiao-Lai basin.Generally,the formation and evolution of the basin experienced several tectonic deformation stages,of which two major deformation stages occurred in the Cretaceous :(1)During the early part of the Early Cretaceous ,the eastern Shandong area was controlled by the regional nearly E-W extensional stress field and extensive volcanic eruption took place in Jiao-Lai basin;the Dasheng Group was deposited in the intermittence of eruption.In the late part of the Early Cretaceous ,the Jiao-Lai basin experienced in-version of folding under the strong regional NW-SE compression.(2)In the early Late Cretaceous ,un-der the regional nearly N-S tensional stress,the Zhucheng down-faulted basin was developed,in which the Wangshi Group was deposited.In the late part of the Late Cretaceous ,the Jiao-Lai basin underwent regional NE-SW compression,resulting in folding of the Wangshi Group.
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Keywords:
- Jiao-Lai basin /
- Yi-Shu rift /
- tectonic stress field /
- Cretaceous /
- Shandong
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