三峡及邻区第四纪沉积物地球化学特征及其对古气候的指示  

The geochemical characteristics of sediments in the Three Gorges of Yangtze River and its adjacent areas: Implication for Quaternary paleoclimate

作　　者：朱宏博 向芳[1] 王金元 黄恒旭 康东雅 张萌[1] ZHU Hongbo;XIANG Fang;WANG Jinyuan;HUANG Hengxu;KANG Dongya;ZHANG Meng(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Guizhou Coalfield Geological Bureau,Liupanshui 553000,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]贵州煤田地质局,贵州六盘水553000

出　　处：《成都理工大学学报（自然科学版）》2019年第6期746-753,共8页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(41572093,41072083,40602011);成都理工大学沉积地质学科研创新团队项目

摘　　要：讨论三峡和宜昌地区第四纪古气候的演化过程及青藏高原隆升对古气候演化的影响。以三峡及宜昌地区第四纪沉积物为主要研究对象,在沉积剖面研究的基础上,对低夷平面、阶地及冲积扇和湖相沉积物进行地球化学元素分析,依据地球化学元素的变化曲线及沉积特征,认为三峡及宜昌地区第四纪古气候的演化趋势相似,经历了早更新世晚期及中更新世暖湿气候到晚更新世干冷气候的转变。结合全球气候背景、青藏高原隆升过程对气候影响等方面的资料,认为150 ka B.P.之后青藏高原隆升至4 km时,青藏高原对三峡及宜昌地区的古气候产生了较大影响。The Quaternary sediments occurred in the Three Gorges and Yichang area are studied in order to discuss the evolution of the Quaternary paleoclimate and the impact of the Qinghai-Tibet Plateau uplift on the paleoclimatic evolution in the area.Sedimentary profiles have been measured the low planation surface,terraces,alluvial fans and lacustrine sediments in the Three Gorges and Yichang areas and the geochemical elements of the collected samples are analyzed.The variation curves and sedimentary characters reveal that the Quaternary paleoclimatic evolution of the Three Gorges is similar to that of Yichang area.It experienced the warm and humid climate from late Pleistocene to mid-Pleistocene,and dry and cold climate in Pleistocene.Through the comprehensive analysis of the global climate background and the impact of the Qinghai-Tibet Plateau uplift on climate,it is proposed that the 4 km uplifting of the Qinghai-Tibet Plateau after the 150 ka B.P.has a great impact on the paleoclimate of the Three Gorges and Yichang area.

关 键 词：第四纪 古气候 元素分析 三峡 宜昌 

分 类 号：P534.63[天文地球—第四纪地质学]