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敦煌伊塘湖沉积物有机碳同位素揭示的末次盛冰期以来湖面变化

DOI: 10.11928/j.issn.1001-7410.2015.01.16, PP. 172-179

Keywords: 敦煌伊塘湖,总有机碳含量,稳定碳同位素,末次盛冰期,全新世大暖期

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Abstract:

对甘肃敦煌伊塘湖沉积物进行了野外钻探采样,采用光释光测年技术确定了沉积物的年代,测定了总有机碳含量(TOC)、碳氮比(TOC/TN)和有机质稳定碳同位素组成(δ13Corg.)等环境代用指标。结果表明,23ka至今,湖区沉积物δ13Corg.在-27.84‰~-22.86‰之间变化,可与TOC对比。干旱气候条件下湖泊沉积物的δ13Corg.变化主要受到沉水植物和挺水植物含量变化的控制,生长于较深水的沉水植物δ13Corg.值偏正,而生长于较浅水的挺水植物δ13Corg.值偏负;另外,部分时期有外源陆生植物产生的有机质输入,影响沉积物的碳同位素值。总体上,干旱区湖相沉积物δ13Corg.值可指示湖水面的变化、间接指示气候干湿变化。δ13Corg.变化的时间序列显示出明显的冰期-间冰期变化,从末次盛冰期到全新世暖期可将伊塘湖的环境演化分为4个阶段:23~13ka是一个气候不稳定时期,整体呈冷干并且湖面水位偏低,但后期有转暖的趋势;13~9ka为冰期向全新世暖期的过渡阶段;9~5ka整体湖面水位偏高、气候暖湿,含有短时间的干事件;5ka至今有变干的趋势。23ka以来,伊塘湖区的湖泊环境演化受全球大气环流与水汽输送路径控制。

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