摘要
对滇东地区峨眉山玄武岩下伏茅口组灰岩进行地层对比表明,地幔柱上涌导致的隆升开始于茅口期,表现为茅口组同沉积过程中断层差异升降形成的水下隆升;而现今看到的茅口组的地层减薄正是水下隆升形成的沉积地层厚度差异和沉积后地表隆升剥蚀的共同结果,但沉积后隆升的规模远远小于前人估算的千米级别。会东大桥-普格-布拖一带发育的砾岩表明峨眉山玄武岩喷发的多期次性和砾岩的水下泥石流成因,根据其分布范围划定了第一期岩浆喷发之后滇东地区的抬升剥蚀以西昌-巧家断裂和普雄-普渡河断裂为东界。根据上述地质证据,总结了滇东地区二叠纪的构造-沉积演化模型。
The stratigraphic comparison of the Maokou limestone below the Emeishan basalts in the eastern Yunnan Province demonstrate that uplift caused by Emeishan mantle plume started in Maokouan, and it appeared as the underwater uplift caused by the footwall uplifting during the syn-depositional normal faulting. The thinning of the Maokou limestone was the product of the initial depositional thickness difference by the underwater uplift and the post-depositional surface uplift and erosion, but the post-depositional uplift was much smaller than the kilometers-level. The conglomerates in Daqiao-Puge-Butuo area indicate the multiple eruptions of the Emeishan basalts and the debris flow deposits of the conglomerates; according to their distribution, the eastern boundary of the erosion scope was Xichang-Qiaojia fault and Pu.xiong-Pu Duhe fault. Based on these geological evidences, we summarized the model of the Permian tectonic-sedimentary evolution related with Emeishan mantle plume in the eastern Yunnan Province.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第6期1793-1803,共11页
Acta Petrologica Sinica
基金
国家重点基础研究发展计划项目(2011CB808901)
国家自然科学基金项目(41030318
91114203)联合资助
关键词
茅口灰岩
泥石流砾岩
小江断裂
地幔柱
滇东地区
Maokou limestone
Debris flow conglomerates
Xiaojiang fault
Mantle plume
Eastern Yunnan Province
