陕北奥陶纪盐盆的区域成矿地质条件分析  

Regional Ore-forming Geological Conditions of the Ordovician northern Shanxi salt basin

作　　者：陈文西[1,2,3] 袁鹤然[1,2,3] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]国土资源部盐湖资源与环境重点实验室,北京100037 [3]中国地质科学院盐湖与热水资源研究发展中心,北京100037

出　　处：《地质学报》2010年第11期1565-1575,共11页Acta Geologica Sinica

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(编号K0903);中国地质调查局项目(编号1212010918025)资助的结果

摘　　要：本文以鄂尔多斯盆地陕北奥陶纪岩盐为主要研究对象,在深入分析以往岩盐的成因机制和充分利用前人的研究资料基础上,从区域古气候、古地理、古构造和岩相古地理方面综合分析认为,奥陶纪时期,陕北盐盆能够发育巨厚岩盐,并且岩盐沉积时的卤水达到钾石盐至光卤石的阶段,是由有利于成盐的干旱古气候条件,有利于蒸发岩发育的半封闭的区域构造、地质条件,以及区域上有利于氯化物盐类迁移富集的预备盆地发育的区域岩相古地理条件共同作用的结果。In this paper,the study focuses on Ordovician halite of northern Shanxi in the Ordos basin.On the basis of an intensive analysis of the previously studied genetic mechanism of halite and the full use of previous data,an integrated regional paleoclimatic,paleogeographic,paleotectonic,and lithofacies-paleogeographic analysis shows that：during the Ordovician very thick halite could develop in the northern Shaanxi salt basin and the brine during precipitation of halite reached the sylvite to carnallite crystallization stage,which resulted from the common action of the dry paleoclimatic conditions favorable for salt formation,semi-enclosed regional tectonics favorable for evaporite development,geological conditions and regional lithofacies-paleogeographic conditions favorable for the formation of preparatory basins for migration and concentration of chloride salts.

关 键 词：陕北奥陶纪岩盐 古气候 古构造 岩相古地理 共同作用的结果 

分 类 号：P532[天文地球—古生物学与地层学] P542[天文地球—地质学]