古地理学报2025，Vol.27Issue(3)：560-577,18.DOI:10.7605/gdlxb.2025.058
四川盆地中二叠世茅口期构造-沉积分异与峨眉山地幔柱活动的耦合关系
Coupling of tectonic-sedimentary differentiation and Emeishan mantle plume during the Middle Permian Maokouan in Sichuan Basin
摘要
Abstract
Recent significant breakthroughs in natural gas exploration have been achieved in the shoal-facies dolomite reservoirs of Member 2 of the Middle Permian Maokou Formation in the Sichuan Ba-sin.The distribution of these dolomite reservoirs is fundamentally controlled by the dynamic interplay be-tween sedimentary evolution and tectonic-sedimentary differentiation during the Maokouan stage under the influence of the Emeishan mantle plume.Integrating field outcrops,drilling data,well logs,and cono-dont biostratigraphy,this study establishes the correlation between lithostratigraphic and biostratigraphic frameworks in the central-northern Sichuan Basin,investigates the coupling mechanism between Emeishan plume activity and Maokouan sedimentary evolution,and precisely constrains the timing of tectonic-sedi-mentary differentiation.Key findings include:(1)Pre-eruptive crustal uplift induced by the Emeishan mantle plume established a SW-high/NE-low carbonate ramp during the deposition of Member 1 to Lower Member 2 of Maokou Formation.Subsequent plume-driven tectonic activity transformed the ramp into a dif-ferentiated platform system during Upper Member 2 deposition,forming the Mianzhu-Pengxi intraplatform depression,Guangyuan-Kaijiang shelf,and the 400 km-long Jian'ge-Fengdu platform-margin belt.(2)Tectonic-sedimentary differentiation initiated within the Jinogondolella altudaensis conodont zone(263-262 Ma),with subsequent intensification of plume activity triggering northward expansion of the Guangyuan-Kaijiang basin facies.(3)Subaqueous volcanic eruptions likely occurred in southwestern Si-chuan during the Maokouan stage,potentially developing an E-W trending intraplatform depression along the Dujiangyan-Jianyang area.(4)Prototypes of the Mianyang-Wusheng shelf and Kaijiang-Liangping intraplatform trough,characteristic of the Late Permian Changhsingian stage,were established no later than the depositional stage of the Upper Member 2 of Maokou Formation.关键词
构造-沉积分异/沉积演化/峨眉山地幔柱/茅口组/四川盆地Key words
tectonic-sedimentary differentiation/sedimentary evolution/Emeishan mantle plume/Maokou Formation/Sichuan Basin分类
天文与地球科学引用本文复制引用
袁海锋,王炳森,山述娇,李天军,袁浩,张本健,匡明志,张玺华,李文杰,彭瀚霖,陈聪,肖钦仁,王涛..四川盆地中二叠世茅口期构造-沉积分异与峨眉山地幔柱活动的耦合关系[J].古地理学报,2025,27(3):560-577,18.基金项目
国家自然科学基金项目(编号:41872130),四川省自然科学基金青年基金项目(编号:2023NSFSC0759)联合资助.Co-funded by the National Natural Science Foundation of China(No.41872130),and the Young Scientists Fund of the Natural Science Foundation of Sichuan Pro-vince(No.2023NSFSC0759) （编号:41872130）
