Luminescence age and palaeoenvironmental implications of a late Pleistocene ground wedge on the northeastern Tibetan Plateau
文献类型：期刊论文
| 作者 | Porter, SC; Singhvi, A; An, ZS; Lai, ZP |
| 刊名 | PERMAFROST AND PERIGLACIAL PROCESSES
 |
| 出版日期 | 2001 |
| 卷号 | 12期号:2页码:203-210 |
| 关键词 | ice-wedge cast Pleistocene permafrost palaeoenvironment Tibet |
| DOI | 10.1002/ppp.386 |
| 文献子类 | Article |
| 英文摘要 | A periglacial ground wedge in bajada gravel near the northern base of the Qinghai Nan Shan underlies loess of late- and postglacial age. The composition and structure of the wedge fill are consistent with an ice-wedge origin, implying former permafrost and relatively moist conditions at this locality. A luminescence date of 15,100 +/- 1600 years from the wedge fill marks the end of ice-wedge activity, which is inferred to have been during the last glaciation. The present mean annual air temperature (MAAT) (-0.7 degreesC) is too high to produce frost cracking and ice-wedge formation, but snowline depression of ca. 700-800 m in the adjacent mountains is consistent with a reduction in MAAT of at least 3.8 degreesC during the last glacial maximum. Such a temperature depression would reduce MAAT to values equivalent to Arctic regions now experiencing active ice-wedge growth. The absence of loess of full-glacial age and the presence of a weakly developed palaeosol atop the bajada gravel imply a stable, cold land surface. Qinghai Lake, although reduced in size at that time, likely raised local humidity to levels that favoured ice-wedge growth in this low-altitude sector (ca. 3000-3400 m) of the Tibetan Plateau. Copyright (C) 2001 John Wiley & Sons, Ltd. |
| 学科主题 | Physical Geography ; Geology |
| WOS关键词 | WESTERN CHINA ; QAIDAM BASIN ; LAKE ; PERMAFROST ; EVOLUTION ; QINGHAI ; LOESS |
| WOS研究方向 | Geography, Physical ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000169567400005 |
| 出版者 | JOHN WILEY & SONS LTD |
| 源URL | [http://ir.ieecas.cn/handle/361006/11926]  |
| 专题 | 黄土与第四纪地质国家重点实验室（1985-2004） |
| 推荐引用方式 GB/T 7714 | Porter, SC,Singhvi, A,An, ZS,et al. Luminescence age and palaeoenvironmental implications of a late Pleistocene ground wedge on the northeastern Tibetan Plateau[J]. PERMAFROST AND PERIGLACIAL PROCESSES,2001,12(2):203-210. |
| APA | Porter, SC,Singhvi, A,An, ZS,&Lai, ZP.(2001).Luminescence age and palaeoenvironmental implications of a late Pleistocene ground wedge on the northeastern Tibetan Plateau.PERMAFROST AND PERIGLACIAL PROCESSES,12(2),203-210. |
| MLA | Porter, SC,et al."Luminescence age and palaeoenvironmental implications of a late Pleistocene ground wedge on the northeastern Tibetan Plateau".PERMAFROST AND PERIGLACIAL PROCESSES 12.2(2001):203-210. |
入库方式： OAI收割
来源：地球环境研究所
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