干旱区生态环境知识资源中心(Arid): 中更新世以来新疆罗布泊地区气候演化过程

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	中更新世以来新疆罗布泊地区气候演化过程
其他题名	EVOLUTIONARY PROCESS OF THE CLIMATE OF LOP NUR REGION OF XINJIANG SINCE MID-PLEISTOCENE
	王宁; 刘卫国; 常宏; 安芷生
ISSN	0256-1492
出版年	2009
卷号	29 期号:2 页码:131-137
中文摘要	综合罗布泊LS2孔的碳酸盐含量、总有机碳、总氮和碳氮比的多指标分析,重建了该地区中更新世以来的沉积环境和气候环境的演化过程.结果表明,中更新世以来罗布泊地区沉积环境经历了中更新世的浅湖相沉积(厚度为12 m)-滨湖相沉积(厚度约为46 m)-浅湖相沉积(厚度为11 m)-滨湖相沉积(厚度为28 m)-晚更新世至今的滨湖相向风成相沉积(厚度约为18 m)环境的演变过程;气候演化过程可以分为7个阶段:阶段Ⅰ(深度115～103 m)气候由暖干向冷干气候转变;阶段Ⅱ(深度103～82 m)冷湿和暖干交替变化;阶段Ⅲ(深度82～67 m)气候相对暖干;阶段Ⅳ(深度67～57 m)气候冷湿;阶段Ⅴ(深度57～46 m.)气候温暖且偏干;阶段Ⅵ(深度46～18m)气候主要在冷湿背景下夹有3次暖干的气候波动;阶段Ⅶ(深度18～0 m)气候干旱化加剧.该研究表明,中更新世时期罗布泊地区沉积环境以浅湖相-滨湖相为主,并在晚更新世发展为以风成相堆积为主;气候变化的水热组合形式主要遵循着"冷湿-暖干"的变化模式.
英文摘要	Climate variability since the mid-Pleistocene is studied from the proxies in core LS2 drilled in the Lop Nur region (N39°46’39.3", E88°23’18.2 ") in the eastern Tarim basin, Xinjiang, China. Geochemical properties, including CaCO_3 content, total organic carbon content (TOC) and total nitrogen content (TN), have been determined to reconstruct the environmental evolution of the area since the mid-Pleistocene. Change of sedimentary facies of Lop Nur region since the mid-Pleistocene is documented through the lithology of sediments. From bottom to top, the sedimentary facies of LS2 core can be classified into shallow lacustrine, shore-lacustrine, shallow lacustrine, shore-lacustrine and shore-lacustrine to aeolian deposites, with thickness of 12 m, 46 m, 11 m, 28 m and 18 m respectively. Evolutionary process of the climate can be divided into seven stages: Ⅰ ( depth of 115～103 m ), changing from warm-dry to cold-dry; Ⅱ(depth of 103～82 m), alternating between cold-wet and warm-dry; Ⅲ (depth of 82～67 m), relatively warm and dry; Ⅳ (depth of 67～57 m), relatively cold-wet; Ⅴ (depth of 57～46 m), relatively warm and dry; Ⅵ (depth of 46～18 m), three warm-dry climate fluctuations folded in the cold-wet climate background; Ⅶ (depth of 18～0 m), intensified arid. This study shows that the sedimentary environment is dominated by shallow lacustrine to shore-lacustrine facies during mid-Pleistocene, while mainly aeolian deposits since the late Pleistocene. The hydrothermal characteristics of climate mainly have been following the form of "cold wet - warm dry" in the region since mid-Pleistocene.
中文关键词	碳酸盐含量 ; 总有机碳 ; 沉积环境 ; 气候 ; 罗布泊
英文关键词	CaCO_3 content total organic carbon total nitrogen carbon/nitrogen sedimentary environment climate Lop Nur
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:3593555
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223802
作者单位	中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安, 陕西 710075, 中国
推荐引用方式 GB/T 7714	王宁,刘卫国,常宏,等. 中更新世以来新疆罗布泊地区气候演化过程[J],2009,29(2):131-137.
APA	王宁,刘卫国,常宏,&安芷生.(2009).中更新世以来新疆罗布泊地区气候演化过程.,29(2),131-137.
MLA	王宁,et al."中更新世以来新疆罗布泊地区气候演化过程".29.2(2009):131-137.