Environmental Evolution of the South Margin of Qaidam Basin Reconstructed from the Holocene Loess Deposit by n-Alkane and Pollen Records

作     者：向树元 曾方明 王国灿 喻建新 

作者机构：Faculty of Earth SciencesChina University of Geosciences Geological Survey of China University of Geosciences Laboratory of Salt Lake Geology and EnvironmentQinghai Institute of Salt LakesChinese Academy of Sciences 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2013年第24卷第2期

页      面：170-178页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by China Geological Survey (Nos.1212011121261 and 1212011121224) 

主　　题：Qaidam Basin Holocene n-alkane loess environmental change. 

摘      要：This study provides the n-alkane and pollen records of the Holocene loess at Balong Town, Dulan County, Qinghai Province, and the environmental changes reconstructed from both records agreed well. Three stages of past climate change were deciphered by variations of the n-alkane and pollen proxies. Before 5 370 a BP, the climate was warm-dry but slightly humid, corresponding to the Mid-Holocene climatic optimum; 5 370-3 830 a BP, the climate changed alternatively between warm-dry slightly humid and warm-dry, indicating the transition from the Mid-Holocene climatic optimum to the Late Holocene cold period; after 3 830 a BP, the climate was mainly warm-dry. The warm cool and extremely dry climate during 3 040-2 600 a BP was recorded by both the n-alkane and pollen proxies, suggesting the environment evolved into desert or salt lake, in accordance with the cold and highly frequent natural disaster period in the Western Zhou Dynasty （ca. 2 996-2 721 a BP） in China.