陆相特殊沉积的研究方法及气候意义  

Climate significance of continental special deposits

作　　者：田馨[1] 向芳[1] 罗来[1] 宋见春[1] 

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059

出　　处：《地学前缘》2009年第5期71-78,共8页Earth Science Frontiers

基　　金：国家重点基础研究发展计划"973"项目(2006CB701401-03)

摘　　要：陆相沉积形成于地圈与水圈、大气圈和生物圈的交界面上,比海相地层更有效地记录了地球表层环境的信息。通过对沉积岩中沉积物的粘土矿物、气候指数、氧同位素测温等研究,获得关于气候干湿冷暖的信息。基于对这些常用方法的研究,提取出一些陆地上的特殊沉积,如:陆相红层、沙漠沉积体系、蒸发岩、煤及油页岩等所包含的丰富气候信息。沙漠代表干旱炎热气候;陆相红层的出现反映高温氧化环境,其在干旱和潮湿的热带气候下都能形成;芒硝代表干冷的气候环境;石膏则代表干热,水体盐度高,蒸发作用强的气候条件;煤层/油页岩一般形成于温暖潮湿的气候环境。对特殊沉积的研究可以用来重建古气候和恢复大陆古环境。The continental special deposits were formed on the surface of the geosphere,hydrosphere,atmosphere and biosphere,which are more effective than marine strata in recording the information of the earth surface environment.By the research of the clay mineral and climatic index of the sediment in the sedimentary rock and its temperature measured by oxygen isotope,we can get different climate information.On the basis of these research methods,we can extract from continental special deposits,such as continental red beds,desert sedimentary systems,evaporates,coal and oil shale etc.,some rich climate information as the following：the desert sedimentary systems represent hot-arid climate;the appearance of the continental red beds reflects the high temperature and oxidized environment,which can formed in both arid and humid tropical climate;the mirabilite implies the climatic conditions being arid and cold;the gypsum stands for hot-arid,high water salinity and strong evaporation condition;the coal and oil shale generally gathered in the environment with warm and humid climate.These researches on the special deposits can be used to reconstruct paleoclimatic and continental paleoenvironment.

关 键 词：陆相特殊沉积 古气候 粘土矿物 气候指数 氧同位素测温 

分 类 号：P532[天文地球—古生物学与地层学]