松辽盆地南缘四平-双辽地区第四系全新统地层划分

QUATERNARY HOLOCENE STRATIGRAPHY IN SIPING-SHUANGLIAO AREA IN THE SOUTH MARGIN OF SONG-LIAO BASIN

松辽盆地南缘大面积被多种成因类型的第四系地层覆盖.按其成因类型,四平-双辽地区可划分的全新统地层单位有:早-中期冲积成因温泉河组;中期湖沼堆积成因坦途组;晚期冲积成因大辽河组;风积成因科尔沁组;湖沼堆积成因协日嘎组.全新世早-中期是一种比较温湿疏林草原—干早的草甸草原植被环境,晚期是一种温湿疏林草原—比较干旱的草甸草原植被环境.

The south margin of Song-Liao basin is mostly covered by Quaternary strata with various types of origin. Based on their origin types, the Holocene strata distributed in Siping-Shuangliao area can be divided into following units： 1） the Wenquanhe formation of alluvial origin in early-middle epoch; 2） the Tantu formation of limnetic accumulation origin in the middle epoch; 3） the Daliaohe formation of alluvial origin in late epoch; 4） the Horqin formation of eolian accumulation origin; and 5） the Xieriga formation of limnetic accumulation origin. The early and middle Holocene epoch was in an environment of relative warm and humid veld to arid meadow vegetation; while the late epoch was in warm and humid veld to relative arid meadow vegetation environment.