【摘要】 <正> 我国西北黄土高原的黄土地层中,含有多层古土壤。梭颇（Thorp.J.）早就注意到中国黄土中的古土壤。刘东生、朱显谟曾多次阐明了黄土中古土壤的成因及其地质意义,并认为中更新世离石黄土中的古土壤多属褐色土类型。近年来,唐克丽对黄土中古土壤的类型也进行了研究。黄土高原发育着多个大型的更新世黄土堆积盆地,形成黄土塬。洛川塬就是其中之一。洛川塬之黑木沟剖面较为典型,黄土地层厚约140米,黄土与古土壤在剖面中交替出现。黄土地层自上而下可分为晚更新世马兰黄土,中更新世离石黄土及早更新世午城黄土。棣属于布伦赫斯正极性世的马兰黄土及离石黄土至少发育了13层红棕色的埋藏古土壤(自上而下依次记为S₁S₂……S₁₃)马兰黄土顶部保存着一层灰褐色的残余型古更多还原

【Abstract】 The units of loess and the layers of paleosol occurred alternaely along the Heimogou profile at Luochuang in Shaanxi province. There are 13 layers of reddish-drab paleosol buried in the Middle Pleistocene Lishi Loess and the Upper Pleistocene Malan Loess. And a layer of grey-black relic paleosol situated on top of Malan Loess is well preserved. On the basis of decalcification of clay plasma and movement of sesquioxides within ar-gillic horizons of paleosol, a tentative subdivision of paleosols of the drab soil series is suggested. A preliminary pattern of the development of natural environments on the Loess Plateau during the Brunhes epoch has been established in the light of paleomagnetic ages and the stratigraphic positions of loess units and paleosol layers in the Luochuan profile, and of characteristics of bioclimatic environments recorded by each loess unit and paleosol layer.更多还原