邵阳盆地二叠纪层序地层初步研究

邵阳盆地是湘中陆表海盆的一部分，二叠纪地层发育完整，微相类型齐全，基本程序类型总体上有局限碳酸盐台地变浅旋回型、较深水台盆相硅泥质沉积的韵律式非旋回型及三角洲相碎屑岩类中的向上变粗或变细型3大类。纵向堆积结构，识别出了陆架边缘体系域、海侵体系域、凝缩段及高水位体系域，进而归并出Ⅲ级层序4个。论述了层序格架及横向变化特征，指出沉积锰矿与早期高水位体系域、煤矿与陆架边缘体系域相关联。

PRIMARY STUDY ON STRATA OF PERMAININ SHAOYANG BASIN

Shaoyang basin is a part of land-surface sea basin with fully developed strata and microfacies types. The types of basic sequence are totally divided into three big types, including gyre-type of localized carbonate table becoming shallow, non gyre-type of deeper water platform basin phase silicon-mire deposit in rhythm, and changing coarse or fine type upwards of delta phase crumb rock. From the construction of lengthways deposit, system field of land -frame skirt, transgression, condensation, and high water level may be recognized, and four layer and sequence of ,three class are mergedand trellis of layer and sequence and variety characteristic of landscape trend are discussed. Relationship between system region of forepart high water-level and sediment Mn-deposit is indicated.