深海现代沉积有机质碳同位素组成变化的古气候证据  

PALAEOCLIMATE EVIDENCE FOR CARBON ISOTOPIC CHANGES OF ORGANIC MATTERS IN MODERN DEEP SEA SEDIMENTS

作　　者：段毅[1] 罗斌杰[1] 

机构地区：[1]中国科学院兰州地质研究所

出　　处：《海洋地质与第四纪地质》1998年第4期53-58,共6页Marine Geology & Quaternary Geology

基　　金：中国科学院南沙综合科学考察项目

摘　　要：分析了南沙海洋深海连续沉积岩心剖面中有机碳同位素，研究了沉积有机质碳同位素组成变化因素及其与古气候旋回的关系。各种有机地球化学指标综合判识表明，该岩心剖面沉积有机质碳同位素组成变化未受有机质性质和成岩作用的影响，主要与古气候变迁关系密切。其δ１３Ｃ低值段对应于晚第四纪末次冰期，高值段对应于末次间冰期。从而为利用深海沉积有机质碳同位素组成研究古气候变迁提供了依据。Core NS90 102 is located in 12°02′N,111°00′E of the Nansha area and at the depth of 2884m.The organic carbon isotopes in the core section have been analyzed,and the relationship between change factors of organic carbon isotopic compositions and palaeoclimate cycles has been studied.Various indexes of organic geochemistry indicate that the organic carbon isotopic compositions in the core section are not affected by nature of the organic matter and diagenesis,and their changes are closely related to palaeoclimate cycles.Our results show that the low δ 13 C values correspond to the last glacial period of late Quaternary,whereas the high δ 13 C values match with the last interglacial period.Such a study provides a basis for understanding palaeoclimate shifts by investigation of organic carbon isotopic composition in the deep sea sediments.

关 键 词：现代沉积 有机质 碳同位素 古气候 深海 沉积 

分 类 号：P532[天文地球—古生物学与地层学] P736.44[天文地球—地质学]