汾河地堑湖盆第四纪地貌—沉积特征的构造控制  

The Development of Morpho-sediment of Quaternary in Fenhe River Graben Basins and the Neotectonic Movement

作　　者：胡小猛[1] 郭家秀[1] 胡向阳[1] 

机构地区：[1]上海师范大学旅游学院地理系,上海200234

出　　处：《地理学报》2010年第1期73-81,共9页Acta Geographica Sinica

基　　金：国家自然科学基金项目(40671018);上海师范大学"自然地理学"校级重点学科项目资助(DZL809);上海师范大学科研基金项目(SK200848)~~

摘　　要：野外对临汾、太原盆地第四纪中晚期所发育的湖积地貌-沉积特征调查发现,湖盆在对应于S8、S5和S1古土壤开始发育时期(时代分别为0.77Ma BP、0.55Ma BP和0.13Ma BP)曾发生了三次强烈湖退,这三次湖退都是构造原因所致的;而在L11-S8、L8-S5、L5-S1黄土古土壤堆积发育期间(时代分别对应于0.96～0.77Ma BP、0.74～0.55Ma BP和0.47～0.13Ma BP)、以及S1古土壤发育以后的时期(时代为0.07Ma BP之后)出现的却是缓慢湖侵或盆地下沉。根据这些发现并结合地球物理学前期已获得的有关盆地深部上地幔结构及活动规律,本文提出了盆地湖侵-湖退过程的构造控制模式。在上地幔强烈上拱→减弱或渐趋稳定→再次强烈上拱的构造循环中,地表湖盆会以大幅快速湖退→缓慢湖侵→再大幅快速湖退这样的表现与之对应。盆地地表的地貌-沉积发育与地下的上地幔活动应具有因果关系。The field work found that there existed three abrupt lake regressions in the Fenhe River Graben Basins during the middle-late Quaternary, which were consistent with the development of paleosols S8, S5 and S1. This indicates that those regressions are not the results of the dry climate but due to the neotectonic movement. The basins experienced slow transgressions when the loess-paleosols between S11-S8, S8-S5 and S5-S1 developed, and sank after S1 had formed. Based on these discoveries and previously revealed data about the activities of the upper mantle in the deep earth around this region, the paper puts forward a hypothesis that can explain how the lake transgression-regression cycles took place under the control of the neotectonic movement. The morpho-sedimentary characteristics are the results and responses of the activities of the upper mantle in the deep earth.

关 键 词：汾河 第四纪 地貌 湖相沉积 湖侵—湖退 构造 

分 类 号：P931[天文地球—自然地理学]