古地理学报2025，Vol.27Issue(4)：886-902,17.DOI:10.7605/gdlxb.2025.029
四川盆地中侏罗统凉高山组物源特征及沉积演化模式
Provenance characteristics and sedimentary evolutionary model of the Middle Jurassic Lianggaoshan Formation,Sichuan Basin
摘要
Abstract
The Middle Jurassic Lianggaoshan Formation in the Sichuan Basin is one of the key hydro-carbon-bearing strata;however,its macro-scale sedimentary systems and evolutionary processes remain poorly understood,and a comprehensive basin-scale sedimentary model is lacking.This study integrates data from heavy and light mineral analyses,core and well logs,palynology,trace elements,and field outcrops to investigate the provenance systems,paleoclimatic conditions,sedimentary microfacies types,sedimentary systems,and their temporal evolution across different depositional intervals of the Lianggao-shan Formation.The results identify six primary provenance areas active during the deposition of the Liang-gaoshan Formation:the central and northern Longmen Mountains,the Micang Mountains,the southern Qinling Mountains,the Daba Mountains,and the ancient Xuefeng Uplift.The basin experienced a clima-tic transition from hot and arid conditions in the early stage,to warm and humid in the middle stage,and a return to hot and arid conditions in the late stage.Nine types of sedimentary microfacies were recognized,including braided channels,interdistributary areas,subaqueous distributary channels and interdistributary zones,estuarine bars,sheet sands,coastal and shallow lacustrine bars,shallow lacustrine mud,and semi-deep lacustrine mud.During the Lianggaoshan depositional period,alternating uplift of surrounding mountain ranges led to flexural subsidence of the eastern and northeastern basin basement,forming a fore-land basin in front of the Daba Mountains.This process established a paleo-tectonic framework charac-terized by a steep eastern and gentle western margin,with multiple sediment source systems.In the early stage,both the depositional and subsidence centers were concentrated in eastern and northeastern Sichuan due to active tectonism,climate variation,and paleotopography.In the middle stage,increased humidity led to enhanced terrigenous input,and the depositional center shifted toward central Sichuan,resulting in a spatial offset between deposition and subsidence centers.By the late stage,the lake basin was filled and gradually contracted.关键词
沉积模式/沉积演化/沉积相/物源特征/凉高山组/中侏罗统/四川盆地Key words
depositional model/sedimentary evolution/sedimentary facies/provenance/Liang-gaoshan Formation/Middle Jurassic/Sichuan Basin分类
天文与地球科学引用本文复制引用
张釜源,祝海华,张本健,王明磊,林思臣,张芮,杨希琳,李育聪,王兴志..四川盆地中侏罗统凉高山组物源特征及沉积演化模式[J].古地理学报,2025,27(4):886-902,17.基金项目
中石油—西南石油大学创新联合体科技合作项目(编号:2020CX050103)及国家自然科学基金项目(编号:42202176)联合资助.[Co-funded by the Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance(No.2020CX050103)and National Natural Science Foundation of China(No.42202176)] （编号:2020CX050103）
