新疆湖泊岩芯记录的未次间冰期以来气候变化初步研究  

A PRELIMINARY STUDY ON THE CLIMATE CHANGE SINCE THE LAST INTERGLACIATION BASED ON LAKE SEDIMENTS FROM XINJIANG, NORTHWEST CHINA

作　　者：段阜涛 安成邦[1] 赵永涛[1,2] 张晓楠 周爱锋[1] 黄小忠 李国强[1] 夏敦胜[1] 陈发虎[1,4] Duan Futao;An Chengbang;Zhao Yongtao;Zhang Xiaonan;Zhou Aifeng;Huang Xiaozhong;Li Guoqiang;Xia Dunsheng;Chen Fahu(Key Laboratory of Western China＇s Environmental Systems（Ministry of Education）,College of Earth Environmental Sciences Lanzhou University,Lanzhou 730000,Gansu;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences Lanzhou 730000,Gansu;School of Resource Environment and Earth Science,Yunnan University,Kunming 650504,Yunnan;Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101)

机构地区：[1]兰州大学资源环境学院,西部环境教育部重点实验室,甘肃兰州730000 [2]中国科学院西北生态环境资源研究院,甘肃兰州730000 [3]云南大学资源环境与地球科学学院,云南昆明650504 [4]中国科学院青藏高原研究所,北京100101

出　　处：《第四纪研究》2018年第5期1156-1165,共10页Quaternary Sciences

基　　金：国家自然科学基金项目（批注号：41671189）资助

摘　　要：针对目前中亚西风影响区湖泊记录研究中的难点和关键科学问题，我们选择新疆的乌伦古湖、博斯腾湖、巴里坤湖钻取了湖泊岩芯，报道它们初步的研究成果。年代测定采用了AMS 14C、光释光技术，并结合古地磁的研究，初步建立了湖泊岩芯的年代框架。巴里坤湖具有末次间冰期以来连续的沉积，是研究气候环境变化的理想载体；博斯腾湖和乌伦古湖都曾经出现过沉积间断，不利于进行高分辨率的气候环境变化重建。从现有的结果来看，末次间冰期气候较为湿润，MIS 3阶段气候的湿润程度降低，LGM时期气候干旱，全新世时期湖泊普遍发育。In the past 150 thousand years, the earth experienced a complete glacial-interglacial cycle encompassing some special periods, such as the Marine Isotope Stage（MIS） 3 and Last Glacial Maximum（LGM）. However, there have, to date, been few studies covering the full glacial-interglacial cycle, especially for the lake studies. Here we present a preliminary study from three inland lakes in Xinjiang, Northwest China, including Wulungu Lake, Bosten Lake, and Balikun Lake. A 24.11 m drilling core（WLG11E） was collected form the center of Wulungu Lake（47°14.4＇N, 87°13.1＇E; 479 m a.s.l.） in February 2011. The present study focuses on the top 9 m of the core. The age-depth model of the core was established based on seven AMS 14C dates measured by Beta Analytic Inc. USA and the Key Laboratory of Western China＇s Environmental Systems（Ministry of Education）, Lanzhou University. A 51.6 m long sediment core（BST12B） was taken from the center of Bosten Lake（42°0.7＇N, 87°9.3＇E; 1051 m a.s.l.） in 2012. In this study, we focus on the depth interval of 0~20 m to infer climate changes. And twelve luminescence dating samples were used to establish the chronology based on multi-grain quartz OSL and K-feldspar post-IRIRSL（pIRIR290） dating. A 62.53 m long sediment core（BLK11A） was retrieved from the center of Balikun Lake（43°36＇~43°45＇N, 92°42＇~92°54＇E; 1575 m a.s.l.） in June 2011. In this paper, we focus on the top 45 m of the core. The chronology framework of the core was established based on fourteen AMS 14C dates measured by Beta Analytic Inc. USA, one OSL date by the Key Laboratory of Western China＇s Environmental Systems（Ministry of Education）, Lanzhou University and existed palaeomagnetic analysis. In this paper, we use lithology characteristics and grain-size data from these three lakes mentioned above to infer climate changes of Xinjiang since the Last Interglaciation. The results show that （1） Balikun Lake has continuous Late Pleistocene deposits spanning

关 键 词：新疆 西风区 湖泊 气候记录 末次间冰期 

分 类 号：P941.78[天文地球—自然地理学] P597.2