西南极长城湾NG93-1沉积柱样碳、氧、锶、铅同位素地球化学研究及其古环境意义  

C,O,Sr AND Pb ISOTOPE GEOCHEMISTRY OF SEDIMENT CORE NG93-1 FROM MAXWELL BAY,WEST ANTARCTIC,AND THEIR PALEOENVIRONMENTAL IMPLICATIONS

作　　者：陈毓蔚[1,2] 桂训唐[1,2] 韦刚健 罗又郎[1,2] 

机构地区：[1]中国科学院广州地球化学研究所 [2]中国科学院南海海洋研究所

出　　处：《地球化学》1997年第3期1-11,共11页Geochimica

基　　金：中国科学院重大项目"八五南极考察研究"

摘　　要：对西南极西北海域乔治王岛和纳尔逊岛之间长城湾浅水海区柱长８３ｃｍ的沉积柱样ＮＧ９３－１进行了矿物学、Ｓｒ、Ｐｂ、Ｏ、Ｃ等同位素地球化学研究。揭示了沉积物以陆源碎屑物为主，证实南设德兰群岛火山岩是该海区沉积物的重要控制源。Ｏ、Ｃ同位素记录了早全新世以来两次冰期，一次高温的气候变动信息，并指出Ｓｒ、Ｐｂ同位素组成的剖面变化具有气候演变的示踪意义。Sediment core NG93-1,with depth of about 83 cm,was collected from Maxwell Bay,West Antarctic (62°14.74′S,58°49.91′W).According to their mineralogy and their comprehensive C,O,Sr and Pb isotopic data,the sediments are mainly derived from continental volcanic clastic debris from the nearby South Shetland Islands.The paleoclimatic change records of two glacial periods and the occurring hypsithermal period during the early Holocene can be inferred from their C and O isotopic signals.The fluctuation of Sr and Pb isotopic ratios in core NG93-1 also provide some indicative significance of paleoenvironmental evolution.

关 键 词：碳 氧 锶 同位素地球化学 古环境 古气候 

分 类 号：P597[天文地球—地球化学] P532[天文地球—地质学]