干旱区生态环境知识资源中心(Arid): 山西晚新生代古地理环境变迁与新构造运动响应

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	山西晚新生代古地理环境变迁与新构造运动响应
其他题名	Evolution of Late Cenozoic Geography and Environment in Shanxi Province and the Neotectonic Response
	闫小兵 1; 李自红 1; 郭瑾 2; 赵晋泉 1; 陈文 1; 扈桂让 1; 苏宗正 1
来源期刊	地震工程学报
ISSN	1000-0844
出版年	2014
卷号	36 期号:2 页码:338-346,352
中文摘要	系统解读了山西晚新生代古地理古环境特征,结合近年来笔者的研究给出了各时代古地理分布图。上新世的构造运动和地理环境演化奠定了现今地理环境的基础,尤其是奠定了现今地貌、水系的轮廓。早更新世地理环境最突出的事件是各断陷盆地中的湖泊广泛发育,出现淹没整个盆地的大湖景观;黄土广泛发育,但主要堆积于吕梁山分水岭以西;黄河在早更新世已经发育,并形成5级阶地。中更新世古地理的主要事件是湖泊的衰退,黄土堆积范围几乎遍布全省,厚可达200m左右,表明气候较早更新世进一步明显变干。晚更新世古地理的主要特征是湖泊消亡,其地理环境更加接近现代。最后,笔者预测未来山西断陷盆地将持续断陷,各盆地内水系不再外流,形成贯通的大湖景观,类似现今的贝加尔湖。
英文摘要	The Late Cenozoic paleogeography of Shanxi was affected by geomorphology,rivers, sedimentary environment,animals,plants,climate,loess,and ancient human activities during the Pliocene and Pleistocene epochs,from about 5.5 million to 12 thousand years ago.The evolution of the paleogeography formed the basis of the modern geography and environment,particularly the modern landscape and water systems.Understanding the ancient environment is also of great importance for effective environmental protection and for predicting future climate.Using information from our recent field investigations conducted throughout Shanxi Province,this paper systematically gives explanatory notes on the paleogeographical and paleoenvironmental characteristics for all epochs of the late Cenozoic in Shanxi Province.During tectonic movements in the early Pliocene,the Shanxi rift zone began to subside.In the Datong,Xinding,Taiyuan,and Linfen areas a rift basin began to form,with the corresponding emergence of small lakes.In the middle and late Pliocene,these basins formed large-scale rift lake because of the intense tectonic movement.The neighboring mountains were uplifted significantly.From then on,the basic geomorphological pattern was consistent with that of the current basin.In the late Pliocene,the rift basin subsided significantly, the climate became cooler,and large lakes began to appear in the rift basin.The early Pleistocene is characterized by wide-spread lakes in rift basins.In general,the climate at this time was a temperate forest and grassland monsoon climate alternating between wet and dry.It was moister and cooler than the Pliocene period,warm and humid in the earlier part,and cool and humid later.Loess deposition began,but mainly in the west of the Luliang Mountain watershed;the Yellow River developed in the early Pleistocene,during which five terraces formed.In the middle Pleistocene the lakes in the first basins began to recede,and loess deposits up to 200 mthick were deposited throughout the province,indicating a fairly arid climate.During this time,large-scale basalt flooding and eruptions occurred in the Datong Basin,caused by Himalayan orogenic movements. In the middle Pleistocene the climate was temperate humid and semi-arid forest steppe, warm and humid in the early part of this interval,cold and drought-prone later,and in general colder and drier than the early Pleistocene.Middle Pleistocene hominid cultural sites have been found at the He River in Ruicheng,containing mainly stone and also burned bones.In the Middle Pleistocene, loess was deposited almost throughout the province which formed the thickest deposits are still preserved today.The most prominent event in the late Pleistocene was the demise of the lakes,and the geography became much closer to its current form.During this time,the mountains were being uplifted and undergoing erosion and sedimentation occurred in the rift basin,with accumulation of thick lacustrine,fluvial-lacustrine and fluvial-alluvial deposits,which formed the present-day plain and became the main sites of ancient and modern human activity.During this interval, the humid,semi-arid forest steppe climate gradually became a steppe climate.Finally,we predict that the Shanxi basin will continuously subside,and,ultimately,the rivers in the basin will not drain,forming agreat-lake landscape,similar to modern Lake Baikal.
中文关键词	晚新生代 ; 古地理 ; 沉积环境 ; 新构造运动
英文关键词	Late Cenozoic paleogeographic sedimentary environment Neotectonics
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:5197426
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230990
作者单位	1.山西省地震局, 太原, 山西 030021, 中国; 2.成都理工大学, 成都, 四川 610059, 中国
推荐引用方式 GB/T 7714	闫小兵,李自红,郭瑾,等. 山西晚新生代古地理环境变迁与新构造运动响应[J],2014,36(2):338-346,352.
APA	闫小兵.,李自红.,郭瑾.,赵晋泉.,陈文.,...&苏宗正.(2014).山西晚新生代古地理环境变迁与新构造运动响应.地震工程学报,36(2),338-346,352.
MLA	闫小兵,et al."山西晚新生代古地理环境变迁与新构造运动响应".地震工程学报 36.2(2014):338-346,352.