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Unconformity in the Lower Triassic of Micangshan Area,northern Sichuan Province:Its discovery and significance
Author(s): SHEN Zhongyan, XIAO Ancheng, WANG Liang, guo , WEI Guoqi, ZHANG Lin
Pages: 1313-
1321
Year: 2010
Issue:
4
Journal: Acta Petrologica Sinica
Keyword: 秦岭; 米仓山; 早三叠世; 铜街子组; 上扬子; 碰撞;
Abstract: 前人认为四川北部米仓山地区下三叠统内部各组地层之间是整合接触,然而通过构造和沉积学的研究发现下三叠统内部(奥伦尼阶)存在一个区域不整合面.在沉积上表现为环米仓山地区广泛发育的陆相和海相碎屑岩,与下伏地层呈不整合接触.地震剖面上表现为不整合面上下的变形特征不一致、不整合面下部地层被削截、古构造的存在等等,通过对古褶皱和古断裂的平面投影,发现古构造走向为东-西向,与勉略构造带走向一致.综合区域大地构造...
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