内蒙古阿巴嘎旗那仁宝拉格地区通古尔组特征及时代

通古尔组是我国中新世的典型沉积,主要分布于内蒙古阿巴嘎旗。由于地形平坦,覆盖严重,地层产状平缓,地表露头有限,对通古尔组系统研究带来了一定的难度。笔者在阿巴嘎旗那仁宝拉格地区开展1:5万区域地质调査工作时利用路线调查、钻探手段系统研究了通古尔组特征。发现本区通古尔组层序齐全、孢粉丰富、划分标志明显,系统采集孢粉样品,分析当时形成气候从干燥到温暖湿润转变,后期又逐渐到寒冷干燥变化。

Characteristic and Date of Tongguer Formation of Abagaqi Area,Abga Banner,Inner Mongolia

Tongguer formation depositions which mainly distributes in Abaga qi ,Inner Mongolia region is the typical sedimentary of middle Miocene in China.This formation in the study zone is characteristic of flat terrain, covered outcrop, gently attitude of stratum and limited outcrop, and then all of which make the study of the Tongguer formation difficult.We have made the areas geology investigation of the scale of 1:50000 in the Chaganaobao, meanwhile made the systematic research for the Tongguer formation by the method route detect and drilling.Finally, we find that the Tongguer formation depositions have full sequences, abundant sporopollen and apparent divisions, the current climate changed from dry to warm and wet in the former, and later changed to cold and dry.