内蒙古伊克昭盟地区盐湖生物地层与古气候研究

内蒙古伊克昭盟地区自全新世以来，湖沼发育，随气候的波动，大部分已演化成为盐湖。各类反映与气候有关的信息均保留在盐湖沉积物中。通过对其中具有代表性的4个盐湖5个钻孔剖面有关生物化石的鉴定与分析，发现介形类化石4个属种，硅藻39个属种和较多的植物种子、草茎及虫管化石。在含有抱粉层位的样品中分析出木本、草本及蕨类孢子等化石41个属种。通过对各钻孔剖面生物地层组合特征综合的分析表明，该区自全新世以来，其气候波动特点为暖湿→冷湿→温干→温凉湿润→凉干的气候波动格局。

ON BIOSTRATIGRAPHY AND PALEOCLIMATE OF SALT LAKES IN YIKEZHAO LEAGUE OF INNER MONGOLIA

Most of limnetic theies in the region of Yikezhao League of inner Mongolia have evolvted intosalt lakes since Holocenc epoch, mainly with climatic fluctuation. Obviously, the fluctuationaldetails would be recorded, more or less, in tile biostratigraphic sediments of the lakes. In the course ofanalysis and identification of the biological fossils from the five boreholes of four representative saltlakes, four species of Ostracoda, 39 species of diatom and numerous plant rhizomes and worn tubeshave so far been discovered while at the sporopollen-rich intervals of log sheets, 41 species ofligneous, herbaceous and fern plants have distinguished. These discovery and distinguish, uponreferring to assemblage aspects of the biostratigraphies for different log sheets, can bring the Yikezhaodistrict a trend of climatic fluctuation during the Holocene period from warmly wet, then coldlywet, then temperately arid, then temperately cold and wet, finally to coldly arid.