Study on Influential Factors of Terrigenous Seguence Formation and Development in Fault-depressed Lacustrine Basin
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摘要: 以南襄盆地泌阳断陷中新生代陆相层序为例,探讨了控制断陷湖盆陆相层序形成和发育的影响因素。研究表明,基底构造沉降、物源供给、古气候波动及湖平面变化是控制断陷湖盆陆相层序发育的四大主要因素。在泌阳断陷湖盆中,区域性构造运动控制着盆地充填序列及构造层序,盆地边界断裂的脉动性控制着地震层序 (层序组 )及层序;物源供给速率与可容空间变化速率比值决定着陆相层序单元堆叠型式;古气候影响陆相层序发育的作用机理是通过影响物源及湖平面变化而产生效应,古气候周期性变迁决定着陆相层序中高频单元的发生、发展和定格;湖平面变化是研究断陷湖盆层序地层的主要内容,它直接控制着陆相层序诸多几何学方面的特征。这四大控制陆相层序发育的基本因素之间存在着一种特定的因果关系.Abstract: Mesozoi。-Neozoic terrigenous sequence of Bivang fault-depression in Nanxiang Basin is treated as a case to study influential factors of terrigenous sequence formation and development. Basement structural suhsidence, sedimentary source recharge, palaeoclimate transformation and lacustrine level change are the four factors which are very important to control terrigenous sequence development in fault-depressed lacustrince basin.In Bivang fault-depressed lacustrince hasi, regional tectonism brought about the formation of basin-fill sequence and tectonic sequence and pulsation of basin boundary faults led to the development of sequence sets/sequence.And the rate of source recharge and accommodation variation determined stacking styles of terrigenous sequence units.Palaeclimate influenced the development of terrigenous sequence by the change of sedimentary source and lacustrine level, and its cyclical transformation determined the formation and evolution of high Erequenev sequence.Lacustrine level change which is an important subject to study terrigenous sequence in fault-depressed lacustrince hasin, directly controlled the terrigenous sequence geometrical characteristics.There is a specific dialectical causality between the four factors which are basic to control terrigenous sequence development.
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