吉泰盆地构造沉积特征及演化分析

吉泰盆地为江西省内一白垩系陆相红色盆地,本文结合以往地震、钻井及地质等资料,开展研究区构造、沉积相等研究,将吉泰盆地划分出1个一级、4个二级、6个三级、9个四级构造单元。在盆地构造演化上,盆地北部的吉安坳陷最先形成,之后受引张作用,盆地继续下沉,凹陷成湖,泰和坳陷、早禾坳陷迅速扩大,沉积中心由北往南迁移,盆地相对较深,白垩世晚期受古太平洋板块俯冲影响,盆地全面抬升,趋于封闭。通过对盆内周田组进行沉积相分析,识别出冲积扇—河流相、三角洲相和湖泊相3种沉积相类型；通过岩相古地理分析,认为周田期沉积中心位于梅岗南东新圩以西一带,为区内富锂卤水矿的勘查提供了地质依据。

Tectono-sedimentary characteristics and analysis of evolution of the Jitai Basin

Jitai Basin is a Cretaceous continental red basin in Jiangxi Province. By studying seismic, drilling and geological data, and conducting structural and sediment research, it is divided into one primary, four secondary, six tertiary and nine four-level tectonic units.On the basin structural evolution, northern basin gian depression the first formed, after the lead, the basin continues to sink, depression into a lake, Taihe depression, depression expanded rapidly, deposition center from north to south, the late Cretaceous, basin is relatively deep, late Cretaceous affected by the ancient Pacific plate subduction, the basin comprehensive uplift, tend to be closed.Sedimentary phase analysis of the Zhoutian group in the basin identified the alluvial fan-river, delta and lake phases. Through the paleogeographic analysis, the Zhoutian phase deposition center is located in the west of Meigang, providing a geological basis for the exploration of lithium-rich brine ore in the area.