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引用本文:蒋庆丰,钱鹏,周侗,洪佳,范华,刘静峰.MIS-3晚期以来乌伦古湖古湖相沉积记录的初步研究.湖泊科学,2016,28(2):444-454. DOI:10.18307/2016.0225
JIANG Qingfeng,QIAN Peng,ZHOU Tong,HONG Jia,FAN Hua,LIU Jingfeng.Preliminary research on ancient lacustrine sediments in Lake Ulungur in arid Central Asia since late MIS-3. J. Lake Sci.2016,28(2):444-454. DOI:10.18307/2016.0225
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MIS-3晚期以来乌伦古湖古湖相沉积记录的初步研究
蒋庆丰1,2, 钱鹏1,2, 周侗1,2, 洪佳1, 范华1, 刘静峰1
1.南通大学地理科学学院, 南通 226007;2.南通大学地理与工程技术研究所, 南通 226007
摘要:
通过对现代乌伦古湖附近出露的古湖相沉积剖面的AMS14C测年,粒度、总有机碳、总有机氮以及碳酸盐等环境代用指标的分析及其与全新世钻孔沉积记录的对比研究,结果发现:乌伦古湖在MIS-3晚期的33600-22500 cal a BP以及冰后期至早中全新世的16500-6500 cal a BP期间,维持着湖相沉积环境,湖面约比现在湖面高40 m.33600-22500 cal a BP的MIS-3晚期,气候相对温暖,乌伦古湖呈现高湖面特征,湖泊沉积物来源以流水搬运为主;22500-16500 cal a BP的末次冰期冰盛期,气候寒冷干燥,湖泊沉积物来源以风力搬运为主;16500-6500 cal a BP的冰后期以及早、中全新世期间,气候回暖,湖泊沉积物主要来源于河流径流作用.6500-5500 cal a BP,受高温干旱事件的影响,湖面收缩、水位剧降,除沉积中心外的其它钻孔位置出现沉积中断.5500 cal a BP后气候转冷变湿,湖泊重新恢复到现在的状态.乌伦古湖MIS-3晚期以来的古湖相沉积环境变化及其反映的古气候万年尺度上的干湿变化与周边区域气候环境变化记录有很好的一致性,响应了区域环境变化和全球气候突变事件.季风和西风的强度消长变化及其引起的环流条件改变以及温度变化引起的蒸发效应可能是区域气候环境变化的主要原因.这一古湖相沉积记录的研究可为MIS-3晚期以来北疆地区的古湖泊演化以及长时间尺度上西风和季风环流相互关系及其影响区的气候环境演化提供地质证据.
关键词:  乌伦古湖  古湖相沉积  MIS-3晚期  干旱事件  古气候  西风
DOI:10.18307/2016.0225
分类号:
基金项目:国家自然科学基金项目(40802084)和南通大学自然科学类科研基金前期预研项目(12ZY014)联合资助.
Preliminary research on ancient lacustrine sediments in Lake Ulungur in arid Central Asia since late MIS-3
JIANG Qingfeng1,2, QIAN Peng1,2, ZHOU Tong1,2, HONG Jia1, FAN Hua1, LIU Jingfeng1
1.School of Geography Sciences, Nantong University, Nantong 226007, P. R. China;2.Institute of Geographic Engineering Technology, Nantong University, Nantong 226007, P. R. China
Abstract:
Ancient Lake Ulungur lasted from 33600 cal a BP to 22500 cal a BP and from 16500 cal a BP to 6500 cal a BP with lake level 40 m higher than that of current Lake Ulungur through analysis of AMS14C dating, grain-size, total carbon and total nitrogen, carbonate content sampled from Ulungur ancient lacustrine sediment profiles around the current Lake Ulungur and through comparison to previous Holocene core lake sediment research results.During late MIS-3 (33600-22500 cal a BP) stage, the climate was relatively warm, ancient Lake Ulungur was in high lake levels and lake sediments transported mainly by river runoff.During Last Glacial Maximum (LGM, 22500-16500 cal a BP), the climate was cold and dry and sources of lake sediments transported by winds.During Postglacial and early to middle Holocene (16500-6500 cal a BP), the climate returned to warm and lake sediments were mainly from runoff again.During the period between 6500-5500 cal a BP, ancient Lake Ulungur shrinked, lake level sharply declined and cores lacked deposits except for the core in the central depression under the influence of high temperature and drought events.And it restored to current status since 5500 cal a BP when the climate turned cold and wet.The records of climatic and environmental evolution of ancient Lake Ulungur were in good accordance with those of adjacent areas.It responded to regional environmental change and global abrupt climate events.Strength and circulation conditions changes between Monsoon and the Westerly and the evaporation effects caused by temperature could be the main causes of regional climate and environmental variation.The study of the sedimentary records from ancient Lake Ulungur can provide geological evidence to ancient large lake evolution in northern Xinjiang and interrelationships between monsoon and the westerly and climate change in their domain areas on long time scales since late MIS-3.
Key words:  Lake Ulungur  ancient lacustrine sediments  late MIS-3  drought events  paleoclimatic evolution  the westerly
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