干旱区生态环境知识资源中心(Arid): 巴丹吉林沙漠东南缘砂楔年代及其环境意义

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	巴丹吉林沙漠东南缘砂楔年代及其环境意义
其他题名	The age of sand wedges and its environmental significance at the southeast edge of Badain Jaran Desert
	余莺潇 1; 王乃昂1 ; 隆浩 2; 宁凯 1; 孙杰 1; 张律吕 1
来源期刊	科学通报
ISSN	0023-074X
出版年	2017
卷号	62 期号:30 页码:3461-3469
中文摘要	巴丹吉林沙漠东南缘新近发现的多处砂楔群和融冻褶皱,分别形成于砂砾石层和湖相沉积地层中,楔内充填物的光释光年龄证明其是末次冰期和晚冰期的产物.巴丹吉林沙漠在末次冰期和晚冰期时处于多年冻土带,年平均气温约为-3~-6℃,较现在降温约12~15℃.其时,整个阿拉善高原与纬度多年冻土带和青藏高原冻土区相连接,沙漠腹地及周边的沙丘应处于冻土状态,沙丘的移动和风沙地貌发育均会受到影响.在冷期,巴丹吉林沙漠很有可能相当于冰冻圈气候,前人关于中国北方沙漠非冻土区的认识值得商榷.
英文摘要	Sand wedge is a product of permafrost in cold climate,and it is of great significance to restore paleoclimate and paleoenvironment. Since the early 20 th century,periglacial landforms such as sand,ice,and soil wedges and glacial mud have been intensively studied in North America,Europe,and Russia. Nevertheless,the distribution of desert areas in the permafrost regions after the last glacial period is still debated in academia. Particularly,in China,it has been argued that desert areas were not the parts of ancient permafrost regions. Moreover,the studies of ancient sand wedges are mostly limited to the last glacial period. In recent years,several groups of ancient sand wedges and glacial mud have been recognized in the Badain Jaran Desert. This filled the gap in the Chinese literature regarding ancient permafrost and proved that desert region belonged to the scope of permafrost regions during the last glacial period. The newly discovered sand wedges in the southeast Badain Jaran Desert comprise sand and gravel layers. Optically stimulated luminescence dating of the filler in the sand wedges suggests that they formed during the last glacial period and the late glacial maximum,in particular. The annual average temperatures in the Badain Jaran Desert during the last glacial period were approximately -3--6℃,and it is 12-15℃ cooler than present. The filler in sand wedges was mainly poorly sorted fine sand that was not transported from afar but from nearby sand dunes. According to the sand wedge groups of the last glacial period in the desert and seasonal frozen soil,we can infer that the Badain Jaran Desert was a part of the permafrost that may have been continuous and widespread. The extent and distribution of the Badain Jaran Desert in the last glacial period was probably different than today,reflecting the dynamic nature of sand dunes. According to the law of sand dunes’ movement in the Badain Jaran Desert,combining with the characteristics of aeolian sand of the desert’s ancient permafrost wedge can indirectly infer that three large desert areas of the Alxa Plateau were connected more than ten thousand years ago when the entire Alxa Plateau was part of the permafrost; furthermore,the desert hinterland and the surrounding sand dunes would have been frozen and the movement and development of the sand dunes would have been suppressed. Surface landscape and the kinetics of the sand and landform need to be studied further. While the Badain Jaran Desert was likely a part of the cryosphere climate zone during the last glacial period,whether the Chinese northern desert belonged to the frozen earth region is still questionable.
中文关键词	砂楔 ; 末次冰期 ; 晚冰期 ; 多年冻土 ; 巴丹吉林沙漠 ; 冰冻圈
英文关键词	sand wedges last glacial period Late Glacial Maximum permafrost Badain Jaran Desert cryosphere
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY ; GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:6145679
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236238
作者单位	1.兰州大学资源环境学院, 兰州, 甘肃 730000, 中国; 2.中国科学院南京地理与湖泊研究所, 南京, 江苏 210000, 中国
推荐引用方式 GB/T 7714	余莺潇,王乃昂,隆浩,等. 巴丹吉林沙漠东南缘砂楔年代及其环境意义[J]. 兰州大学,2017,62(30):3461-3469.
APA	余莺潇,王乃昂,隆浩,宁凯,孙杰,&张律吕.(2017).巴丹吉林沙漠东南缘砂楔年代及其环境意义.科学通报,62(30),3461-3469.
MLA	余莺潇,et al."巴丹吉林沙漠东南缘砂楔年代及其环境意义".科学通报 62.30(2017):3461-3469.