塔里木盆地西部博古孜河剖面记录的亚洲内陆干旱化及其成因  

Late Miocene-Pleistocene aridification of Asian inland revealed by sediments at Boguzihe section from western Tarim Basin,NW China

作　　者：张志高[1] 滕晓华[2] 韩文霞[3] 张宏亮[1] 娄延军 刘雪[1] 

机构地区：[1]安阳师范学院资源环境与旅游学院,安阳455002 [2]兰州大学资源环境学院西部环境教育部重点实验室,兰州730000 [3]中国科学院青海盐湖研究所盐湖资源与化学重点实验室,西宁810008

出　　处：《干旱区资源与环境》2017年第3期144-151,共8页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(41602366;41301222);河南省高等学校重点科研项目(16A170006);安阳师范学院大学生创新基金项目(ASCX/2016-Z131)资助

摘　　要：亚洲内陆干旱化是全球新生代大陆环境变化中最引人瞩目的重大事件,其形成与演化与青藏高原隆升和新生代全球变冷等因素密切相关。文中对塔里木盆地西部博古孜河剖面晚中新世-早更新世湖相-扇三角洲相沉积序列进行了初步的色度和地球化学测试与分析。结果表明:塔里木盆地干旱化至少始于5.7Ma,3.7-2.1Ma,干旱化逐渐增强。3.7-2.1Ma,受局地地形的影响,山体隆升截留西风水汽,发生局部水文事件。约2.1Ma后,盆地持续干旱化。我们认为晚中新世-更新世青藏高原、天山的隆升,帕米尔高原的隆升与向北推挤以及阿来依谷地的关闭是5.7Ma以来亚洲内陆干旱化的主要驱动因素。A series of significant global continental environment change events occurred in the Cenozoic which have led to enormous changes to the earth climatic and environmental system. Among them, the aridification of Asian inland is one of the most important scientific questions and has attracted worldwide attentions due to its profound effects on human beings and scientifically linking with Tibet uplift, Paratethys Sea retreat and global cooling. Here we report continuous lithologic （sedimentary color） and geochemical （CaCO3 and salt ions） re- cords from precisely dated late Miocene -early Pleistocene sedimemary sequence of Boguzihe section from west- ern Tarim Basin, NW China. They indicate that arid climate had prevailed within the basin at latest at ca. 5.7 Ma and gradually increased in degree until ca. 3.7 Ma. Between ca. 3.7 and 2.1 Ma, because of local topogra- phy, a hydrologic event occurred, which supplied more water from the Tien Shah. After ca. 2.1 Ma the climate in the basin turned to hyper arid. We attributed the stepwise drying of the Asian inland since ca. 5.7 Ma to the late Miocene - Pliocene episodic uplift of the Tibetan Plateau, Pamir and the Tien Shan and the connection of the Pamir with the Tien Shah in remote response to the collision of India with Asia.

关 键 词：塔里木盆地 晚中新世-更新世 干旱化 帕米尔高原 青藏高原 

分 类 号：P532[天文地球—古生物学与地层学]