摘要
通过对位于干旱－半干旱区的内蒙古盐湖中沉积物提供的环境和气候条件之相关讯息，能解读出最近２３ｋａＢ．Ｐ．以来详细的气候变化：据今２０～２３ｋａＢ．Ｐ．期间，气候呈温干特征；之后，气候变冷进入末次冰期的极盛期。在１４．５～２０ｋａＢ．Ｐ．期间，降水量大幅度减小，夏季风萎缩，而冬季风更加强劲。自１４．５ｋａＢ．Ｐ．开始，全球进入冰消期。约在１１ｋａＢ．Ｐ．左右，出现异常降温的新仙女木（ＹｏｕｎｇｅｒＤｒｙａｓ）突变事件。自２．３ｋａＢ．Ｐ．以来，夏季风乃处于衰退减弱之趋势，其中仍有明显的气候波动。台湾的撤退池和嘉明湖沉积物，则记录着最近数千年来的气候变动，其中的冷暖变化竟也大多与内蒙古盐湖的记录相对应。似能说明２０～２３ｋａＢ．Ｐ．以来较大范围的气候变化。
Chinese Lanping Simao basin and Thai Ale basin are common in geotectonic location, mineralizing age and level, and characters of brine. Paragenesis of salt minerals and compotion of primary brine in the former are the same as those in the latter largely due to northward feeding of the latter brine, as is proven by the tendency of the former brine gradually, from north to south, becoming inspissated. In the Ale basin, upper , middle and lower salt formation may be referred as three salt forming phases, and the middle has been identified in the Lanping Simao down-warped zone while the lower in the Simao basin. By inference, the Simao basin's lower salt formation is inferior in inspissation degree and superior in ore type to the Ale basin's. Thus, the formation, called lower muddy gravel formation in China, should be regarded as a potential stratigraphic level for potassium resouurce hunting.
出处
《化工矿产地质》
CAS
1997年第2期73-80,共8页
Geology of Chemical Minerals
关键词
内蒙古
盐湖
湖泊
盐类沉积物
古气候
Lanping Simao basin , Ale basin , potassium bearing level, mineral paragenesis, brine affinity, potassium hunting direction
