2016年12月，第22卷，第4期，598-607页
Dec 2016,Vol.22,No.4，pp.598607 DOI: 10.16108/j.issn10067493.2016022
交地质学报
高校
Geological Journal of China Universities
江西信江盆地罗塘凹陷膏盐微量元素地球化学特征
朱志军12，郭福生12，邱安庆2
1.东华理工大学省部共建核资源与环境国家重点实验室培育基地，南昌330013：
2.东华理工大学地球科学学院，南昌330013
摘要：江西信江盆地罗塘凹陷发育一套晚白垩世周田组暗色泥岩与膏盐岩互层沉积，为了解膏盐岩成因，综合利用钻井资料和地球化学分析手段进行研。结果表明，研究区膏盐岩主要发育在周田组二、三、四段，岩性为含钙石膏泥岩和泥质石膏岩，其次为（硬）石膏岩。稀土和微量元素地球化学特征揭示了膏盐岩与围岩的物源均来自陆源，而非深部岗水。膏盐岩具有早期高水位浅水区和晚期低水位深水区两种沉积模式。早期高水位浅水区沉积模式主要分布在盆地边缘，沉积了紫红色含钙质结核泥岩夹膏盐岩；晚期低水位深水区沉积模式主要分布在盆地中心，发育了膏盐岩与暗色泥岩互层沉积。
并组成多个盐的律。平面上由盆地边缘到中心依次沉积了碳酸盐岩、膏盐岩类的典型蒸发岩序列。关键词：信江盆地；罗塘凹陷；膏盐岩；微量元素
中图分类号：P595
文献标识码：A
文章编号：10067493（2016）04-059810
TraceElementGeochemicalCharacteristicsofGypsumandIts
GeologicSignificancefromtheLuotangDepression
in Xinjiang Basin, Jiangxi ZHU Zhijun'2, GUO Fusheng'2, QIU Anqing
1. State Key Laboratory Breeding Base of Nuclear Resources and Environment,
East China Institute of Technology , Nanchang 330013, China;
2. College of Geosciences, East China Institute of Technology, Nanchang 330013, China
Abstract: Dark red mudstone interbedded gypsum of late Cretaceous was developed in the Luotang depression in Xinjiang Basin, Jiangxi. Gypsum trace element geochemical characteristics provide ways to decipher the depositional environment, together with well log data. This study shows that: (1) Gypsum was mainly developed in the second, third, and fourth section in Zhoutian Formation, which consists of gypsumbearing calcium mudstone and muddy gypsum roxck and a small amount of (hand) gypsum rocks; (2) Trace normalized patterns show that gypsum and wall rocks were terrigenous rather than deep brine sourees; (3) Gypsum was developed in shallow water and deep water in early and late stage, respectively. It was probably located at the edge of basin in early stage. intercalated with purple calcareous mudstone tuberculosis gypsolith. It was mainly distributed in the central basin with gypsum rock and dark mudstone deposition in the late stage , forming rhythmic salt layers. From the edge to the center of the basin, it was deposited as typical evaporite sequence from carbonate rocks to gypsolith.
Key words: Xinjiang Basin; Luotang depression; gypsum rock; trace element First author : ZHU Zhijun, Associate Professor; E-mail: zhuxj013@163.com
收稿日期：20160212；修回日期：20160426
基金项目：国家自然科学基金项目（41362008；U0933605）：江西省教育厅科技项目（CJJ14475)；核资源与环境重点实验室开放基金项目
(NRE1506）联合资助
作者简介：朱志军，男，1976年生，博士，副教授，从事况积孚教学和研究工作：E-mail；zhuj013@163.oxm