The Lakes’ Revolution And Environmental Change During Quaternary In Taipusi, Inner Mongolia

Tapusi County is located in Xilinhot city, the southeastern Inner Mongolia. It’s an area of less research that the Quaternary stratigraphy was not established and there are no studies on the lake brines and their revolution to understand the paleogeography and paleoclimate of this area. The paper establishes Quaternary stratigraphy and reconstitutes the lakes’revolution and environment change during Quaternary with adopting multi-disciplinary theories and methods that cross sedimentology, geology,geomorphology, etc for the first time in this area.The Quaternary stratigraphy developed well and can be divided into the Old Pleistocene, Middle Pleistocene, Epipleistocene and Holocene. It’s genetic types are alluvial, aeolian material, slope sediments, lake sediments and marsh sediments, etc. It happened too much change to the environment as the Mongolia plateau raising, and the change was recorded by the lakes in this area. There are 3-4 lakeshore terraces around the Hua Nur Lake and Wulan Nur Lake. The evolutionary tendency is gradually shrinking. The Hua Nur Lake dried up into swamp and the Wulan Nur Lake is dry now. The paleoclimate in this area go through warm and humid during Pliocene, cold-warm and dry during Pleistocene, and cold and dry during Holocene in despite of Holocene Optimum according to the Pollen analysis results. The vegetation pattern changed from sylvosteppe to steppe. There were 3 times tectonic uplifts since Epipleistocene according to the sediments in different periods and the scope of terraces.There are some favorable factors in this area to salts and gold placers such as geological structure, climate, hydrology and the gold-metallogenetic. Salt-forming prospective regionalization is the Hua Nur-Wulan Nur Lake, and three ore-forming areas are predicted based on the data of geochemical exploration around Wulan Nur Lake.