【摘要】 <正> 松辽平原的第四纪地层,过去尚缺乏磁性地层的研究资料.为了进一步修订地层表,我们用磁性地层学方法,对黑龙江省哈尔滨地区、吉林省榆树和长春地区以黄土为主的剖面,结合内蒙古自治区奈曼旗和库伦旗地区的黄土剖面(图1),做了一些初步的研究工作,并试以辽河以西地区的黄土地层,把黄土发育不够典型的松辽平原区与北方典型黄土区的第四纪地层,从磁性地层学的角度进行对比.更多还原

【Abstract】 In this paper, ten sectns exposed in the areas of the Harbin, Heilongjing Province, the Yushu and Changchun, Jilin Provice, as well as the Naiman, Inner Mongolia, are studied with the magnetostratigraphic method. The variation of geomagnetic polarity, the luminescent and 14C dating, the fossil Mammalia and others of each stratigraptic horizon are comprehensively-considered, the Quaternary magnetostratigraphic system of the Songliao Plain and the West Liaohe Mountain are established respectively and correlated with one of the Loess Region of North China (See Attached list)In the Songliao Plain, the bottom of the Baitushan formation which containes fossil Equus sanmenicesis is under the Keane event of the Gauss normal epoch, the Olduvia event of the Matuyama reversal epoch appears in its top, and the dividing line of the Lower and Upper may be determined at the Gauss/Matuyama boundary. The Jalamilla event of the late Matuyama epoch was discovered not only in the middle of the fluviolacustrine bed of the Huangshan formation (Huangshan A-A’ section, Harbin), producing Dicror/tinus kirchbergensis, but also in the lower of the Loess bed of the Dongfeng formation (Yaofenshuling section, Changchun). The Matuyama/Brunhes boundary appears in the Dongfeng formation, with a luminescent dating 203,000 yr. B. P. at its top.In the West Liaohe Mountain, the Ningcheng Loess with normal polarity and fossil Prosiphneus youngi belong to the Olduvia event of the middle Matuyama epoch, and the lower of the Chifeng Loess, hearing fossil Muospalax fontanier, represents the Matuyama/Brunhes boundary.There are three periods of the major neotectonic movements, i. e., the first one was occurred from the late Gilbert epoch to the early Gauss epoch; the second one was happened during the early Matuyama epoch, and the third was taken place after the Olduvia event and ending before Jalamillo event, which may be correlated to the Yuanmou Movement of the Southwest China, and Nihewan Movement of the North China, and the Qiangtang Movement of the Qinghai-Xizang (Tibet) Plateau.Combining the Quaternary magnetostrata with the glaciation, the fossil Mammalia and the stratigraphic features, it is proposed that the lower limit of the Quaternary can be suitably set near the Gilbert/Gauss boundary.更多还原