干旱区生态环境知识资源中心(Arid): 塔里木盆地南缘新生代沉积:对青藏高原北缘隆升和塔克拉玛干沙漠演化的指示

Arid

	塔里木盆地南缘新生代沉积:对青藏高原北缘隆升和塔克拉玛干沙漠演化的指示
其他题名	Cenozoic sedimentation in the southern Tarim Basin: Implications for the uplift of northern Tibet and evolution of the Taklimakan Desert
	郑洪波 1; 贾军涛 2; 王可 1
ISSN	1005-2321
出版年	2009
卷号	16 期号:6 页码:154-161
中文摘要	塔里木盆地南缘新生代沉积地层厚达万米以上.研究的叶城和阿尔塔什两个剖面分别厚4 500 m和7 000 m,基本代表了塔里木南部的新生代沉积.叶城剖面的底界年龄根据磁性地层测定约为8 Ma.阿尔塔什剖面的底界年龄根据海相碳酸盐岩~(87)Sr/~(86)Sr的比值与全球Sr同位素曲线对比,约为30～35 Ma.从岩性地层分析,剖面的下部为中新统乌恰群,主要由泥岩和粉砂岩组成,沉积相为低能环境的辫状河和曲流河.剖面的中部是上新统阿图什组,由红色泥岩、砂岩夹薄层砾岩以及埋藏风成黄土构成,沉积环境为冲-洪积扇的中远端.剖面的上部是上新统-下更新统西域组,由中粗砾岩夹块状粉砂岩透镜体(埋藏风成黄土)组成,主要是近源洪积扇沉积和风成沉积,以上地层层序可以进行很好的区域对比.塔里木盆地南缘新生代沉积由新近纪红层向上变化为逆粒序砾岩和碎屑流沉积,记录了青藏高原北缘隆升造成的沉积环境的变化,尤其是干旱化气候的阶段性演化.在约8 Ma时,叶城和阿尔塔什两个剖面都发育了风成沙丘沉积.而在阿尔塔什剖面,沙丘沉积之下还发育了一套厚层的膏盐沉积,指示了塔里木盆地南缘在此前后已经相当干旱,只是仅凭这些证据还难以判断沙漠发育的规模.而上新世-更新世阿图什组和西域组中发育的埋藏风成黄土沉积,则指示了塔克拉玛干沙漠在此时已经发育到了相当规模,极度干旱的气候条件(可能类似于现在)已经形成.
英文摘要	The Yecheng and Aertashi sections comprise ～4.5 km and ～7.0 km of Cenozoic sedimentary successions, respectively. The age control of the two sections is based on magnetostratigraphy,~(87)Sr/~(86)Sr measurement and regional stratigraphic correlation. The lower part of the sections is mainly composed of fine-grained mudstone and fine sandstone, which makes up the Wuqian Group (Miocene). The palaeoenvironment is low-energy, meandering and braided streams. The middle part is composed of red mudstone, sandstone with thin conglomerate beds, which makes up the Artux Formation (Pliocene). The paleoenvironment is distal-to mid-fan environment. The uppermost part of the section, known as the Xiyu Formation (Plio-Pleistocene), consists of cobble and boulder conglomerate intercalated with massive siltstone lenses, which formed as proximal alluvial fan and eolian deposits. The formation of eolian dunes at ～8 Ma and underlying playa lake deposits (as at Aertashi) may indicate an arid, enclosed basin in the southern Tarim at that time. Eolian loess deposition as represented by the siltstone bands in the Xiyu and Artux Formations indicates that the Taklimakan Desert and the regional climate regime may have been fully developed by the Early Pliocene. The onset of eolian sedimentation in the southern Tarim Basin coincided with the uplift of the northern Tibetan Plateau. The Tibetan Plateau uplift resulted in the shift of sedimentary environments northwards into the southern Tarim Basin, and could well have triggered the onset of full aridity in the Taklimakan region.
中文关键词	塔里木盆地南缘 ; 青藏高原北缘 ; 塔克拉玛干沙漠 ; 晚新生代沉积环境
英文关键词	Southern Tarim Basin Northern Tibet Plateau Taklimakan Desert Late Cenozoic sedimentary Environment
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:3751592
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223432
作者单位	1.南京大学,地球科学与工程学院, 南京, 江苏 210093, 中国; 2.同济大学, 海洋地质国家重点实验室, 上海 200092, 中国
推荐引用方式 GB/T 7714	郑洪波,贾军涛,王可. 塔里木盆地南缘新生代沉积:对青藏高原北缘隆升和塔克拉玛干沙漠演化的指示[J],2009,16(6):154-161.
APA	郑洪波,贾军涛,&王可.(2009).塔里木盆地南缘新生代沉积:对青藏高原北缘隆升和塔克拉玛干沙漠演化的指示.,16(6),154-161.
MLA	郑洪波,et al."塔里木盆地南缘新生代沉积:对青藏高原北缘隆升和塔克拉玛干沙漠演化的指示".16.6(2009):154-161.