STABLE CARBON ISOTOPE RECORD OF BULK ORGANIC MATTER FROM THE SIHAILONGWAN MAAR LAKE, NORTHEAST CHINA DURING THE PAST 18.5ka
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摘要: 结合含水量、TOC含量和TOC/TN比值变化曲线,18·5kaB·P·以来的四海龙湾玛珥湖沉积物全岩有机碳同位素组成（δ13CTOC）记录可划分为3个阶段:1)末次冰期晚期（18·5～14·7kaB·P·）,δ13CTOC值偏正,变化范围为-29·50‰～-26·18‰,平均值约为-28·10‰;2)末次冰消期（14·7～11·7kaB·P·）,δ13CTOC值显著偏负,变化范围为-33·92‰～-28·40‰,平均值约为-31·75‰,在δ13CTOC值变化曲线上表现为一个低谷,但在类似YoungerDryas的冷干事件期间（12·7～11·7kaB·P·）,δ13CTOC值再次显著偏正,最高可达-28·4‰;3)全新世以来（11·7kaB·P.至今）,δ13CTOC值变化幅度不大（-30·85‰～-27·37‰）,基本上都在平均值-29·1‰左右。研究表明,大气CO2浓度变化是影响18·5kaB·P·以来四海龙湾玛珥湖δ13CTOC值变化的主导因素。Abstract: Sihailongwan Maar Lake is one of the eight Maar lakes in Longgang Volcanic Field, Northeast China. Three Sino-Germany cooperational drilling campaigns were conducted from August 1998 to July 2001, and three composite profiles of lake sediments have been constructed. Correlated with analytic results of water contents, TOC concentrations and TOC/TN ratios of composite profile Ⅱ, the stable carbon isotope record of bulk organic matter （δ13CTOC） can be divided into three stages during the past 18.5ka: （1） the late stage of the Last Glacial （18.5～14.7kaB.P.）. The δ13CTOC values were less negative, within the range of -29.50‰～-26.18‰ and with the average of -28.10‰. （2） the last deglaciation （14.7～11.7kaB.P.）. The δ13CTOC values became much more negative, which changed from -33.92‰ to -28.40‰, with the average of -31.75‰. There generally appears a valley on the δ13CTOC curve, with the exception that during the period of a Younger Dryas-like cold event （12.7～11.7kaB.P.）, the δ13CTOC values reach a peak of -28.4‰. （3） the Holocene （11.7kaB.P.～present）. The δ13CTOC values remained relatively stable （-30.85‰～-27.37‰） around the average of -29.1‰.
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