The Ostracods Assemblages and Environmental Evolution of the Qingtu Lake, Minqin County, Gansu Province since 7 ka BP
详细信息
- 责任者：Cai Yanfeng (Key Laboratory of Plateau Lake Ecology and Global Change ; Yunnan Normal University ; Kunming 650500 ; China) ; Zhang Hucai
- 刊名：Acta Micropalaeontologica Sinica
- 出版年：2013
- 卷期：30(3)
- 关键词：介形亚纲 ; Ostracoda ; 沉积演化 ; sedimentary evolution ; 甘肃 ; Gansu Province
- 页码：p.263-274
- 图表：5 illus., 64 refs.
- 分类号：1400
- issnNo：ISSN1000-0674
- isbnNo：CN32-1189/Q
摘要
Totally 11 species of ostracods belonging to 7 genera have been identified from the ZhiYun section which belongs to the terminal lake of the Shiyang River of east Hexi Corridor,Minqin county,Gansu Province and six ostracods assemblages can be distinguished.Based on the 14 C dating,ostracods ecological characters and sedimentary lithological characteristics,the present paper discussed the environmental change of the Qingtu lake since 6 620aBP.The result shows that from 6 626 to 6 137aBP climate transform from warm-dry into cold-wet,with repeated deepening and freshening water.From 6 137to 5 817aBP,the climate was cold and dry with the lake level turning to shallow.During 5 817—2 978aBP,the lake was very shallow with fresh waters;the climate was cold-dry and turned to unfavorable for ostracods gradually.It shows characteristics of the Holocene cooling event of ca.5ka.From 2 978 to1 610aBP,the environment deteriorated continuously,and water body was once retreated from the height of the profile,which indicated severe dry environment.During 1 610—1 110aBP,the climate condition was ameliorated but generally characterized by a relatively dry environment.From 1 110aBP,the lake was totally dried up and turned to the desert with warm-dry environment.
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