三门组的内涵及其意义  

THE CONNOTATION AND SIGNIFICANCE OF SANMEN FORMATION

作　　者：王书兵[1] 蒋复初[1,2] 吴锡浩[1] 王苏民[3] 田国强[1] 

机构地区：[1]中国地质科学院地质力学研究所 [2]中国科学院南京地理与湖泊研究所湖泊沉积与环境开放研究实验室,南京210008 [3]中国科学院南京地理与湖泊研究所湖泊沉积与环境开放研究实验室

出　　处：《第四纪研究》2004年第1期116-123,共8页Quaternary Sciences

基　　金：国家自然科学基金项目 (批准号 :40 3 0 2 0 2 5 );国家重点基础发展研究规划项目 (批准号 :G19990 43 40 1);国土资源部基础研究项目 (批准号 :2 0 0 10 2 0 2 );中国科学院知识创新工程项目 (批准号 :KZCX2 -10 8);中国科学院湖泊沉积与环境开放实验室基金项

摘　　要：黄河三门峡水库北岸的山西省平陆县黄底沟剖面 ,较完整地保存着古三门湖湖相沉积记录。经磁性地层研究结果表明 ,古三门湖沉积起始于吉尔伯特负极性时中期 ,大约在 5MaB .P .;结束于布容正极性时晚期 ,结合热释光年龄 ,大约在 1 5 0kaB .P .。鉴于这套地层均属古三门湖沉积地层 ,按照岩石地层学的命名原则 ,依然称之为三门组 ,并根据岩性特征自上而下划分为三段 :上段以砂层为主 ;中段以粘土层为主 ;下段为底砾石层。黄底沟剖面是已知的记录古三门湖发育起始时间最早。The lacustrine deposits of the ancient Sanmen Lake have been preserved in good condition in the Huangdigou profile which is located at the north of Sanmenxia Reservoir in Pinglu County of Shannxi Province. From a study of the magnetostratigraphy, the deposition of the ancient Sanmen Lake is known to have started in the middle of Gilbert reversal polarity chron, about 5MaB.P., and ended in the late of Brunhes normal polarity chron, consistent with OSL age, about 150kaB.P. Since the depositions belong to the Ancient Sanmen Lake, and according to the lithostratigraphic principle, it is referred to as Sanmen Formation. Based on the lithological characters, the sequence can be subdivided into three parts, the upper part consisting dominantly of sand layers, the middle part of clay layers and the lower part of basal gravel. The series is now known to have the longest period of deposition that commenced earlier and terminated later than all others ever reported.

关 键 词：磁性地层 三门组 沉积 地层剖面 黄河 

分 类 号：P534.6[天文地球—古生物学与地层学]