【摘要】 本文根据堆积物具有的多方面共同特点,确认黑龙江省东部河谷地区(河床、河漫滩和一级阶地)堆积物为流水成因。又根据岩石地层、年代地层、磁性地层及孢粉资料综合分析与评价该地区发育的冰缘现象的形成时代,特别是对嘉荫县团结沟大青剖面同时发育的四层冰缘层内卷划分为四个形成期:第一形成期称中团结沟冰缘阶,时代47400±2800—22000±250年;第二形成期称晚团结沟早冰缘阶,时代14800±740—13000年;第三形成期称晚团结沟晚冰缘阶,时代11370±100—10000年;第四形成期称大青冰缘期,时代约6500年。更多还原

【Abstract】 In the valleys of the eastern mountainous area of Heilongjiang province from Mohe in the north to Dongning in the south, the Quaternary strata of first-order bench are mainly fluvial origin. The fossil periglacial phenomena are widely and well developed in over twenty sections of quaternary and exposed in Xinlonggou district of Huma county, Wudaogou district of Aihei county and Tuanjiegou district of Jiaying county. A group of samples have been collected for 14C dating,thermoluminescence, paleomagnetic and palynologic determinations. The corresponding test results from the samples are obtained. In the Daqing section, which is in Tuanjiegou district by the southern limit of permafrost and 8 m in thickness, four freezing-melting involution layers were recognized. Based on the isptopic datings and paleomagnetic data, the ages of periglacial action may be separated into four stages: the Middle Tuanjiegou periglacial stage (47 400 ± 2800-22 000± 250 B.P.); the early Late Tuanjiegou periglacial stage (14 800 ± 740-13 000 B.P.); the late Late Tuanjiegou periglacial stage (11 370± 110-10 000 B.P.) and the Daqing periglacial stage (about 6500 B. P.).更多还原