黔西水城—紫云地区晚古生代裂陷槽盆充填和演化

Chen M H, Shi L. Filling and evolution of the Late Paleozoic Shuicheng-Ziyun aulacogen in western Guizhou, China. Geological Bulletin of China,

研究了贵州西部古生代发育起来的北西向水城-紫云裂陷槽盆的充填序列和演化。根据地层的岩性特征、接触关系、垂向序列和形成的构造背景等,将该槽盆的充填过程划分为3个序列：深水盆地非补偿沉积到浅海陆棚沉积,是以张裂作用为主的构造作用的产物；槽盆→槽盆边缘→槽盆边缘斜坡(下斜坡)→台缘斜坡,为张裂兼走滑复合构造机制作用下的产物；台缘斜坡环境的海进序列到海退序列,受走滑作用影响明显。根据影响和控制盆地的构造、沉积和岩浆作用等多种因素,将该槽盆的发展演化分为4个阶段：隆起剥蚀阶段、地壳拉伸变薄阶段、断裂沉陷阶段和地幔柱作用阶段。

This paper discusses the filling succession and evolution of the NW-trending Paleozoic Shuicheng-Ziyun aulacogen in western Guizhou. According to the lithologic characteristics, contact relationships and vertical succession of the strata and the structural setting, the filling process of the aulacogen is divisible into three successions： starved deep-water basin to neritic deposits, which are the product of tectonism dominated by extension-fracturing; deposits of trough→trough margin→trough margin slope （lower slope）→platform-margin slope, which formed by the mechanism of combined extensional-fracturing and strike-slip motion; and deposits of transgressive to regressive sequences in a platform-margin slope environment, which were evidently affected by strike-slip motion. According to multiple factors such as structure, deposition and rnagrnatism affecting and controlling the aulacogen, four stages of evolution of the aulacogen may be distinguished： uplift-erosion stage, crustal extension and thinning stage, fracturing and subsidence stage and mantle plume stage.