江西贵溪盆地周田组膏盐特征及成因分析  

Characteristics and Origin of Gypsum in Zhoutian Formation in Guixi basin,Jiangxi

作　　者：刘行军[1,2] 巫建华[3] 董业才[3] 

机构地区：[1]中国石油测井有限公司长庆事业部,陕西西安710201 [2]西北大学地质系,陕西西安710069 [3]东华理工大学资源与环境重点实验室,江西南昌330013

出　　处：《东华理工大学学报（自然科学版）》2015年第3期292-300 330,330,共10页Journal of East China University of Technology(Natural Science)

摘　　要：对江西贵溪盆地周田组膏盐的沉积特征、岩石学特征、地球化学特征进行了分析,研究结果表明,该盆地膏盐主要由纹层状泥质石膏、薄层泥质石膏、薄层含泥硬石膏以及石膏脉组成,沿盆地基底断裂带上涌的地层深部卤水是膏盐类物质的主要来源,纹层状泥质石膏形成于水体较深的环境;薄层泥质石膏形成于浅水环境;含泥硬石膏的形成主要受高盐度流体的控制。周田组湖相地层成岩以后,由于盆地边缘断裂的活动使地层产生了裂缝,溶解了早先沉积膏盐的地表水或表层地下水进入裂缝,形成了贵溪盆地的石膏脉。石膏脉的产状、形态表明,石膏脉是在区域张应力并伴随有不同程度剪切应力环境下形成的。Through the analysis of sedimentary,petrology,geochemistry characteristics of gypsum in Zhoutian formation in Jiangxi Guixi basin we can find that gypsum are made up of laminar clay gypsum,thin layer clay gypsum,thin layer contained clay anhydrite,and gypsum vein. The brine from the deep bottom of basin ascended through fault belt mainly was the source of the saline deposits. Laminar clay gypsum formed in the more deep water. The thin layer clay gypsum formed in shallow water. The formation of contained clay anhydrite is controlled by high saline fluid. Gypsum vein formed after the diagenesis of lacustrine stratum of Zhou Tian formation. The surface water or ground water dissolved early deposited gypsum rock,and entered the fracture that formed as the result of activity of fault,then through crystallization the gypsum vein formed. The shape and occurrence of gypsum vein show that it is formed in the environment of region open stress with some squeezed stress.

关 键 词：贵溪盆地 膏盐成因 周田组 深部卤水 

分 类 号：P619.261[天文地球—矿床学]