渤海湾盆地临清坳陷晚古生代古地理特征*

运用沉积学、地层学、板块构造学等学科理论，分析了临清坳陷晚古生代沉积特征，采用单因素分析多因素综合作图法进行岩相古地理编图，总结出其盆地演化特征。研究结果表明：临清坳陷晚古生代沉积类型主要包括障壁—潟湖沉积、潮坪沉积、碳酸盐岩台地沉积、河控浅水三角洲沉积及曲流河—湖泊沉积。编制5张岩相古地理图，分析发现：本溪期以潮坪相和碳酸盐岩台地相沉积为主；太原期以碳酸盐岩台地相、障壁—潟湖相以及潮坪相沉积为主；山西期以河控浅水三角洲相沉积为主；下石盒子期主要是曲流河道和泛滥平原沉积为主；上石盒子期主要以曲流河与湖泊沉积为主。研究区盆地演化可以划分为3个阶段：第1阶段为晚石炭世至早二叠的本溪期与太原期，主要是陆表海充填沉积阶段；第2阶段为过渡环境沉积充填阶段，即二叠世山西期；第3阶段为陆相环境沉积阶段，包括上石盒子和下石盒子期。

Palaeogeographic characteristics of the Late Paleozoic in Linqing Depression, Bohai Bay Basin

Theories of sedimentology,stratigraphy,plate tectonics and so on,were used to study the sedimentary characteristics of the Late Paleozoic in Linqing Depression, Bohai Bay Basin.Single factor analysis and multifactor comprehensive mapping method was used to reconstruct quantitative lithofacies palaeogeography and the evolution characteristics was concluded.The results are as follows: There are five sedimentary types in the research area,which are barrier-lagoon,tidal flat,carbonate platform,fluvial-controlled shallow-water delta and meandering fluvial-lacustrine deposits. Tidal-flat and carbonate platform deposits are the primary deposits in Benxi period. Carbonate platform,barrier-lagoon and tidal-flat deposits are the primary deposits in Taiyuan period.Fluvial-controlled shallow-water deltaic deposits are the primary deposit in Shanxi period,Meandering river and flood plains deposits are the primary deposits in Xiashihezi period,Meandering fluvial and lacustrine deposits are the primary deposits in Shangshihezi period.The basin evolution can be divided into three stages: The first stage is Benxi and Taiyuan periods of the Late Carboniferous-Early Permian and its mainly feature is the epicontinental sea sedimentary succession;the second stage is Shanxi period of the Permian and the transitional environment is the main feature;the third stage is Shihezi period of the Permian and terrestrial strata is the main sediments.