黄河下游环境变迁在巨野钻孔沉积特征上的响应  

ENVIRONMENT CHANGES OF THE BACKWARD POSITION IN THE YELLOW RIVER RESPONDS TO JUYE DEPOSIT CHARACTERISTIC

作　　者：要吉花[1] 谭利华[1] 魏全伟[1] 萧凌波[1] 

机构地区：[1]北京师范大学地理学与遥感科学学院,北京100875

出　　处：《北京师范大学学报（自然科学版）》2005年第2期199-203,共5页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学青年基金资助项目(40001003)

摘　　要：通过对巨野国庄钻孔剖面的粒度特征的分析,结合历史文献资料,揭示了巨野泽环境变迁的历史以及黄河决溢改道对其的影响.剖面以10.6 m为界分2部分,下部对应公元2000年以前,当时巨野泽面积广大,汶水注入其间,沉积环境既有洪水期的河床沉积环境,又有平水期的湖滨浅水沉积环境.10.6 m以上受黄河泛滥影响,湖泽逐渐减小至消失,沉积物既包括河流沉积物,也包括湖泊沉积物.其中5.75～2.66～0.75～0.6 m对应年代约为公元944年-公元1374年公元1850年-1950年,平均沉积速率逐渐减小,分别为7.1,4.1,1.5 mm·a-1.According to the grain-size characteristic of Juye drill profile and historic literature, the environment change of this area is analyzed. The profile is divided into two sections by depth 10.6 m, The lower section represents a period about 2000 years ago, in which this area was mainly affected by Wen River and Juye Lake which was large at that time, the deposit environment was interlaced by riverbed with flood and shoaling lake side. Because the Yellow River changed its course, the upper section was affected, and Juye Lake became smaller and smaller, finally disappeared and the sediment involves both fluvial sediment and lake sediment. The period of 5.75 2.66 0.75 0.60 m is AD 944—AD 1374—AD 1850—AD 1950, the mean deposit rate minished, that is 7.1 4.1 1.5 mm·a -1 .

关 键 词：沉积特征 概率累积曲线 环境变迁 

分 类 号：P512.2[天文地球—地质学]