来凤白垩纪陆相沉积盆地特征及石膏矿成因分析  

Characteristics of Laifeng Cretaceous Continental Sedimentary Basin andGenesis of Gypsum in the Basin

作　　者：罗华 刘力 廖明芳 毛启曦 潘龙克 梅小元 Luo Hua;Liu Li;Liao Mingfang;Mao Qixi;Pan Longke;Mei Xiaoyuan(Hubei Geological Survey,Wuhan,Hubei 430034;312 Geological Team,Bureau of Geology and Mineral Exploration of Anhui Province,Bengbu,Anhui 233040)

机构地区：[1]湖北省地质调查院,湖北武汉430034 [2]安徽省地质矿产勘查局312地质队,安徽蚌埠233040

出　　处：《资源环境与工程》2023年第1期9-17,共9页Resources Environment & Engineering

基　　金：中国地质调查局项目“湖北省1∶5万丁砦幅、来凤幅、大河坝幅、龙山县幅、百福司幅区调”(DD20160029-15)。

摘　　要：来凤白垩纪陆相沉积盆地是恩施地区面积第二大的“红层”盆地。在系统梳理和消化前人资料的基础上,对该沉积盆地地层格架和沉积相进行调查研究,并对盆地内石膏矿成因进行分析。将来凤盆地沉积物划分为9种岩石相组合,提出来凤盆地经历了伸展断陷、挤压兼走滑和抬升剥蚀3个演化阶段,并指出盆地内石膏矿成矿物质主要来源于盆地红色碎屑含盐建造及周缘碳酸盐岩,在风化淋滤和地下水作用下,含膏盐流体沿盆地裂隙迁移后重结晶成矿。Laifeng Cretaceous continental sedimentary basin is the second largest‘red bed’basin in Enshi area.On the basis of systematically combing and digesting previous data,through the investigation and study of the stratigraphic framework and sedimentary facies of the sedimentary basin,as well as the analysis of the genesis of gypsum deposits in the basin.The sediments of Laifeng basin are divided into nine lithofacies assemblages,and it is proposed that Laifeng basin has experienced three evolutionary stages:extensional faulting,compression and strike slip,and uplift and denudation.It is pointed out that the ore-forming materials of gypsum in the basin mainly come from the red clastic salt formation in the basin and the surrounding carbonate rocks.Under the action of weathering,leaching and groundwater,the gypsum salt fluid migrates along the fractures of the basin and then recrystallizes.

关 键 词：白垩纪 盆地演化 石膏 来凤盆地 

分 类 号：P512.2[天文地球—地质学] P619.261