地质学报Issue(11)：2072-2083,12.
四川盆地早中三叠世成盐期岩相古地理及成盐模式
Lithofacies Paleogeography and Salt-forming Model of Lower-Middle Triassic in the Sichuan Basin
摘要
Abstract
The Low-Middle Triassic in the Sichuan basin contains several sets of the salt layers. The characteristics of the salt layers are thick, wide distribution and well-marked depositional cycles. Nowadays,the research of the sedimentary and the lithofacies palepgeography in Sichuan basin usually service for the oil and gas exploration.There is few research of the micro-phase related to the evaporation and salt-forming.On the basis of the previous studies and the information about looking for the salt, potash,oil,and gas,this paper divides the Sichuan basin into 18 secondary salt basins and 5 salt forming zones.By taking the carbonate platform as the emphasis,according to the sedimentary structure, biological characteristics and lithofacies associations,18 types rocks in the low-middle Triassic have been classified.They constitute 3 different sedimentary facies (open platform,restricted platform and evaporate platform),6 kinds of subfacies and 13 kinds of sedimentary microfacies.According to the sedimentary distribution of the salt layer,4 pieces of lithofacies paleogeographic map have been drawn in this paper, including 4 main period of the salt forming,T1 j 4-2 ,T1 j 5 -2 - T2 l 1 -1 ,T2 l 3 -2 ,T2 l 4-2 .The every sedimentary facies has the salt lake as the core and distribute as belt,with the form of the bull’s-eye type zoning.In summary,the salt-forming model of Sichuan basin in Early-Middle Triassic could be concluded as “the small playa lake with a bull's-eye type zoning in supratidal environment”.关键词
四川盆地/早中三叠世/沉积相/岩相古地理/成盐模式Key words
Sichuan Basin/Low-Middle Triassic/sedimentary facies/lithofacies paleography/salt-forming model引用本文复制引用
龚大兴,周家云,吴驰华,李萌..四川盆地早中三叠世成盐期岩相古地理及成盐模式[J].地质学报,2015,(11):2072-2083,12.基金项目
本文为国家973项目“中国陆块海相成钾规律及预测研究”（项目编号2011CB403005）资助的成果； （）
