试论短周期幕式构造沉降对陆相断陷盆地高频沉积旋回的控制

近年来,在构造背景稳定的海相地层中,基于米兰科维奇旋回控制下的高频旋回逐渐成为进行地层精细划分、定年和探讨盆地演化的重要手段,并被逐渐尝试着应用到陆相断陷盆地中。但陆相断陷盆地为构造盆地,断裂构造理论以及大量地表、地下的构造、沉积现象都表明,在高频旋回沉积过程中可能存在着短周期幕式构造沉降的影响,这就使得在陆相断陷盆地中应用米兰科维奇旋回理论必须要考虑和去除这种影响。

Control of Short-period Episodic Rifting to Sedimentation of High-frequence Cycle in Continental Rift-subsidence Basin

Resent years, high-frequence cycle charged by Milankovitch cycle as an important manner for stratigraphic classification, conforming age, and discussing basin evolution, is tried to used to continental rift-subsidence basin. But continental rift-subsidence basin is structure basin, fault structure theory, a lot of sedimentation and structure phenomenon which are on or under the surface show us that there is probably influence which short-period episodic rif- ting control the sedimentation of high-frequence cycle. The influence is need to eliminate before using Milankovitch cycle in continental rift-subsidence basin. In recent period, the primary research maybe be limited some sides. The first is to find out sedimentary response of short-period episodic settlement within deposit of high-frequence cycle; the second is to research sedimentary feature, lateral change and contrast of tectonic high-frequence cycle with different sedimentary location and source distance ; the third is to study accurate index and contrast of paleoclimate and paleowater depth in lacustrine high-frequence cycle. These sides are very important before to pick-up Milankovitch sedimentary cycle accurately.