西南地区三叠系盐矿床类型及分布规律  

THE SALINE DEPOSIT TYPE OF THE TRIAS AND ITS DISTRIBUTIONAL REGULARITY IN THE WESTSOUTHERN OF CHINA

作　　者：蔡本俊[1] 

机构地区：[1]中国地质科学院地质力学研究所

出　　处：《地质力学学报》1991年第1期75-91,共17页Journal of Geomechanics

基　　金：国家自然科学基金85029项目

摘　　要：本文阐述了我国西南地区三叠系的含盐层位、盐矿床类型,分布规律,同时结合中新生代构造-岩浆演化特点、成盐条件及找矿标志,探讨了该区三叠系找钾方向和前景。The triassic is the major period of the formation of salt deposits in south China.The Triassic salt-bearing horizons consist of.the second mere- her of the lower triassic Jialingjiang formation (T_1j^2),the fourth-fifth mem- ber of the lower triassic Jialingjiang formation to the first member of the middle triassio Leikoupo formation (T_1j^(4-5)—T_2L^1),the third member of the middle triassic Leikoupo formation (T_2L^3),the fourth member of the middle triassic Leikoupo formation (T_2L^4),the middle triassic Baishan formation (T_2b),and the Jiapeila formation (T_3j),the Bolila formation (T_3b)and the Sanhetong formation (T_3s) of upper Triassic. Among the above-mentioned salt-bearing horizons,the fourth-fifth mem- ber of the Jialingjiag formation to the first member of the Leikoupo forma- tion (T_1j^(4-5)—T_2L^1)and the fourth member of the Lelkoupo formation (T_2L^4) are the most developed.The salinity of the ancient seawater might have then evolved to sedimentation of potassium-magnesium salts.All other horizon,s contain only gypsums and halites. The triassic saline sediments have the following characterstics: 1.Most of the saline horizons are closely associated with carbonates,a few with red beds.The salt-bearing sediments attain a thickness of about one kilometre,covering an area of about one million square kilometres.Their sedimentation is polycyclic. 2.There are a good variety of the Triassic salt deposit types,including dolomites,gypsums,anhydrites,barites,celestines,halites,polyhalites and salt brine (B,K,Li—),with associated limestones,oil and natural gas. 3.There is a general trend of increasingly higher horizon of the saline sediments from east to west.T_1j^2 for those in western Hubei province, T_1j^(4-5)—T_2L^1,T_2L^3,T_2L^4 for those in the Sichuan basin,northern Guizhou province and southern Shanxi province,T_2b in southwestern Sichuan provin- ce and northwestern Yunnan province,T_3j,T_3b and T_3s in eastern Tibet and northwestern Yunnan province. 4.The triassic saline sediments are characte

关 键 词：矿床类型 分布规律 雷口坡组 杂卤石矿床 嘉陵江组 找矿标志 中三叠统 新生代构造 层位 碳酸盐岩 

分 类 号：P55[天文地球—构造地质学]