段阜涛^1,,
安成邦^1,,,
赵永涛^1,2,
张晓楠^1,3,
周爱锋¹,
黄小忠¹,
李国强¹,
夏敦胜¹,
陈发虎^1,4
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

基金项目: 国家自然科学基金项目（批注号：41671189）资助


详细信息

作者简介: 段阜涛, 女, 26岁, 博士研究生, 湖泊沉积与环境变化研究, E-mail:duanft16@lzu.edu.cn

通讯作者: 安成邦, E-mail:cban@lzu.edu.cn

中图分类号: P941.78;P597⁺.2;P534.63;P532

收稿日期:2018-05-21
修回日期:2018-07-29
刊出日期:2018-09-30

A preliminary study on the climate change since the last interglaciation based on lake sediments from Xinjiang, Northwest China

Duan Futao^1,,
An Chengbang^1,,,
Zhao Yongtao^1,2,
Zhang Xiaonan^1,3,
Zhou Aifeng¹,
Huang Xiaozhong¹,
Li Guoqiang¹,
Xia Dunsheng¹,
Chen Fahu^1,4
1. Key Laboratory of Western China's Environmental Systems(Ministry of Education), College of Earth Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu
2. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu
3. School of Resource Environment and Earth Science, Yunnan University, Kunming 650504, Yunnan
4. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101


More Information

Corresponding author: An Chengbang,E-mail:cban@lzu.edu.cn

MSC: P941.78;P597⁺.2;P534.63;P532

--> Received Date: 21 May 2018
Revised Date: 29 July 2018
Publish Date: 30 September 2018


摘要
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。
关键词: 新疆/
西风区/
湖泊/
气候记录/
末次间冰期

Abstract: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 the last glacial-interglacial interval, thus is beneficial for the reconstruction of the past climate change in arid areas of China; while the other two lakes are characteristic of haitus due to erosion. (2) After comparisons with these three records, we get the conclusion that:an optimum climate prevailed the most areas of Western China during MIS 5, and this humid condition made clay-dominated sedimentation in most lakes; a continuous and gradually drying climate was found during MIS 3, leading to an increase in coarse particles in Balikun and Wulungu lakes. Hiatus occurred during LGM, accompanying with elevated grain size that indicated a degraded environment. The Holocene deposits were featured by clay and/or silty-clay, which suggested a gradual trend towards a wetter environment with high lake level.
Key words:Xinjiang/
western wind regions/
lake/
climate change/
the last interglaciation



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