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青海湖地区的晚第四纪黄土记录了湖区晚第四纪以来的环境和气候变化.迄今为止,对于青海湖地区晚第四纪黄土物质来源的研究较薄弱.以青海湖东岸的种羊场晚第四纪风成沉积剖面为主要研究对象,在青海湖区及其周边采集了黄土、风成砂、湖相沉积、河流沉积等样品,结合黄土高原西部临洮黄土样品,对它们的元素组成(<75μm的硅酸盐组分)进行了对比研究.初步结果表明:(1)K_2O/Al_2O_3(摩尔比)和Zr/Ti、Zr/Nb比值显示青海湖地区的风成沉积显著区别于本区的河流沉积和湖相沉积;(2)青海湖地区的晚第四纪黄土与黄土高原西部临洮黄土的K_2O/Al_2O_3和Zr/Ti、Zr/Nb比值相一致;(3)青海湖地区的晚第四纪黄土可能来自柴达木盆地.
The late Quaternary loess in the Qinghai Lake area recorded the environmental and climate changes since the late Quaternary in the lake area, and so far, the research on the source materials of the loess in the late Quaternary in Qinghai Lake area is relatively weak. Late Quaternary Aeolian Sedimentary Profile was the main research object. Samples of loess, aeolian sand, lacustrine sediments, and river sediments were collected in and around Qinghai Lake area. Combined with the samples of Linli loess in western Loess Plateau, their elemental composition <75μm), the preliminary results show that: (1) K 2 O / Al 2 O 3 (molar ratio) and Zr / Ti and Zr / Nb ratios show that the aeolian deposition in the Qinghai Lake region is significantly different from that in this region (2) The ratios of K_2O / Al_2O_3 and Zr / Ti, Zr / Nb of Late Quaternary Loess in Qinghai Lake Area and Linli Loess in the west of Loess Plateau are the same; (3) Late Qinghai Lake area Quaternary loess may come from Qaidam Basin.