晚冰期以来大柴旦盐湖沉积记录的古气候演变及其尘暴事件
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摘要
选择大柴旦盐湖DCD03沉积剖面柱硼镁石矿层下伏土黄色淤泥质粉砂层为研究对象,基于AMS ~(14)C年代学、岩性地层学、矿物学以及地球化学等研究方法,旨在探讨土黄色湖相淤泥质粉砂沉积记录的尘暴事件,以及重建晚冰期以来西风环流显著影响区的水文气候变化。研究结果表明,DCD03沉积剖面的淤泥质粉砂样品粒度频率曲线呈现为双峰态,主峰(均值10μm)反映了河流作用携带入湖的细粒组分,次峰(>32μm)则反映了风力作用以及河流作用等携带入湖的粗粉砂粒组分。大于64μm的砂砾组分可能代表外源风尘物质的输入,由尘暴天气携带入湖。大柴旦地区晚冰期以来依次出现了博令和阿勒罗德暖期(12.94～12.17 cal.ka BP)、新仙女木冷期(12.17～11.37 cal.ka BP)、不稳定的早全新世气候(11.37～8.64 cal.ka BP)以及趋于偏冷干的中全新世早期(8.64～7.39 cal.ka BP)。
The paper focused on the study of muddy silt from sediment profile DCD03 of Da Qaidam Salt Lake,based on AMS ~(14)C chronologic,lithostratigraphic,mineralogical and geochemical methods,aimed to discuss the dust storm event recorded by earthy yellow muddy silt,and reconstruct the hydro-climate changes of Da Qaidam region since Late Glacial period.The results showed that the grain-size distribution curve appeared double kurtosis,the main peak(10 μm) reflected fine-grained component by fluvial action,and the secondary peak(>32 μm) reflected coarse-grained component by aeolian and fluvial action.The gravel component(>64 μm)may record the dust storm event.Da Qaidam region underwent B?lling/Aller?d warm period(12.94-12.17 cal.ka BP),Younger Dryas cold period(12.17-11.37 cal.ka BP),unstable early Holocene period(11.37-8.64 cal.ka BP) and relatively cold-dry early mid-Holocene period(8.64-7.39 cal.ka BP) in sequence since Late Glacial period.
The paper focused on the study of muddy silt from sediment profile DCD03 of Da Qaidam Salt Lake,based on AMS ~(14)C chronologic,lithostratigraphic,mineralogical and geochemical methods,aimed to discuss the dust storm event recorded by earthy yellow muddy silt,and reconstruct the hydro-climate changes of Da Qaidam region since Late Glacial period.The results showed that the grain-size distribution curve appeared double kurtosis,the main peak(10 μm) reflected fine-grained component by fluvial action,and the secondary peak(>32 μm) reflected coarse-grained component by aeolian and fluvial action.The gravel component(>64 μm)may record the dust storm event.Da Qaidam region underwent B?lling/Aller?d warm period(12.94-12.17 cal.ka BP),Younger Dryas cold period(12.17-11.37 cal.ka BP),unstable early Holocene period(11.37-8.64 cal.ka BP) and relatively cold-dry early mid-Holocene period(8.64-7.39 cal.ka BP) in sequence since Late Glacial period.
引文
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[31] 张丽莎,余俊清,刘子亭,等.黄旗海沉积岩芯烧失量变化曲线:冰后期环境演变的有效代用指标[J].盐湖研究,2007,15(1):12-15.
[32] 刘子亭,余俊清,张保华,等.烧失量分析在湖泊沉积与环境变化研究中的应用[J].盐湖研究,2006,14(2):67-72.
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[34] Qiu S F,Zhu Z Y,Yang T,et al.Chemical weathering of monsoonal eastern China:implications from major elements of topsoil [J].Journal of Asian Earth Sciences,2014,81:77-90.
[35] 曾方明,刘向军,叶秀深,等.青海湖种羊场风成沉积的常量元素组成及其化学风化指示[J].盐湖研究,2015,23(1):1-7.
[36] 陈忠,马海州,曹广超,等.尕海地区晚冰期以来沉积记录的气候环境演变[J].2007,27(1):131-138.
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[38] 郑绵平,向军,魏新俊,等.青藏高原盐湖[M].北京:北京科学技术出版社,1989:1-431.
[39] 邱盛南,李衍霖.青海某地硼酸盐矿床控制因素的初步探讨[J].青海地质,1979,(1):55-64.
[40] Sun D H,Bloemendal J,Rea D K,et al.Grain-size distribution function of polymodal sediments in hydraulic and aeolian environments,and numerical partitioning of the sedimentary components [J].Sedimentary Geology,2002,152(3):263-277.
[41] Liu X Q,Dong H L,Yang X D,et al.Late Holocene forcing of the Asian winter and summer monsoon as evidenced by proxy records from the northern Qinghai-Tibetan Plateau [J].Earth and Planetary Science Letters,2009,280(1):276-284.
[42] 刘兴起,姚波,杨波.青藏高原北部可可西里库赛湖沉积物及风成物的粒度特征[J].第四纪研究,2010,30(6):1193-1198.
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