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对黑河中游酒东盆地大洼井(DWJ)和新开九队(XKJD)两个钻孔以及现代黑河干流和支流进行重矿物采集与分析。分析结果发现:DWJ钻孔下部(140~69.7 m)沉积物重矿物特征同摆浪河与马营河的相似性较高;DWJ钻孔上部(69.7~0 m)和XKJD钻孔(65.6~0 m)的沉积物重矿物特征与现代黑河干流、梨园河和山丹河两个支流比较吻合。重矿物组合特征的变化指示了沉积物的源区发生明显变化。DWJ钻孔上部与下部的岩性和沉积相均发生明显变化,重矿物组合特征所反映的源区变化指示了黑河中游水系发生重要调整。对比钻孔岩芯和走廊区第四系岩相剖面特征,推测此次黑河中游沉积环境与水系格局发生变化的时间大致为早-中更新世之交。
Heavy minerals collection and analysis were carried out on two boreholes in Daojing well (DWJ) and XKJD (XKJD) and the modern mainstream and tributaries of the Heihe River in the middle reaches of the Heihe River. The results show that the features of heavy minerals in the lower part of DWJ (140 ~ 69.7 m) are similar to those of the Huyinghe and Yingyinghe. The upper part of the DWJ borehole (69.7 ~ 0 m) and the XKJD borehole (65.6 ~ 0 m) sediment heavy mineral characteristics and modern Heihe mainstream, Liyuan River and Shandan two tributaries more in line. Changes in heavy mineral assemblages indicate significant changes in source areas of the sediments. The lithology and sedimentary facies of the upper and lower parts of DWJ borehole obviously changed, and the change of source area reflected by heavy mineral assemblage signified the important adjustment of the water system in the middle reaches of Heihe River. Comparing the characteristics of Quaternary facies lithofacies in boreholes and corridors, it is presumed that the time of sedimentary environment and water system changes in the middle reaches of Heihe is roughly at the turn of Early-Middle Pleistocene.