摘要
在全面了解陆相层序地层学研究现状的基础上，认为陆相层序及体系域发育仍受湖平面相对变化控制，构造、气候及沉积物供给的控制作用最终通过湖平面变化表现出来。而湖平面的变化可分为完整旋回与不完整旋回两种情况，进而提出了所形成的层序及体系域模式：在完整旋回中形成了湖泊充填、湖泊扩张、湖泛和湖泊萎缩４个体系域，对应层序为Ⅰ型层序；在不完整旋回中形成了湖泊充填、湖泊扩张、湖泛３个体系域，或者湖泊扩张、湖泛、湖泊萎缩３个体系域，对应层序为Ⅱ型层序。以松辽盆地西部斜坡实际工作为例，提出了中生代层序及体系域划分方案。
Though sequence stratigraphic analysis of terrestrial basin differs greatly from that of shelf marginal basins,the authers think that sequence strata of terrestrial basins are also controlled by the changes of relative lake level.The changes of relative lake level is the synthetic reflection of many factors that are the tectonic movement,sediment supplies and climate changes.The present paper suggests the models and the alternative terminology about sequence stratigraphy suited for terrestrial basins.Sequence formed in complete cycle is called Ⅰ type sequence,including lacustrine filling system tract (LFST),lacustrine extension system tract (LEST),lacustrine inundating system tract (LIST),and lacustrine contraction system tract (LCST);sequence formed in incomplete cycle is called Ⅱ type sequence,including lacustrine filling system tract (LFST),lacustrine extension system tract (LEST) and lacustrine inundating system tract (LIST),or LEST,LIST and LCST.Exemplified by the western clinoform of Songliao Basin,three supersequences are divided by the regional unconformities that are syn rift subsidence supersequence,post rift subsidence supersequence and post rift shrink supersequence,and a series of sequences are subdivided into supersequences by local unconformitis.
出处
《地质科技情报》
EI
CAS
CSCD
北大核心
1998年第4期37-42,共6页
Geological Science and Technology Information
