Isotopic composition of the fine fraction of ODP Site 114-704

Ocean Drilling Program Site 704 in the subantarctic South Atlantic was drilled to investigate the response of the Southern Ocean to climatic and Oceanographic developments during the late Neogene.
Stable oxygen and carbon isotopes of fine-fraction (<63 µm) carbonate were analyzed to supplement similar analyses of benthic and planktonic foraminifers. The fine fraction is generally composed primarily of coccoliths, and isotopic analyses of the fine fraction were made to complement the foraminiferal analyses. The isotopic curves thus generated suggest paleoceanographic changes not recognizable by the use of benthic and planktonic foraminifers alone. […]

为探究晚新近纪时期南大洋对气候及海洋学演变的响应，科研人员在亚南极南大西洋海域实施了海洋钻探计划（Ocean Drilling Program）704站位的钻井作业。
研究人员对细组分（<63微米）碳酸盐的稳定氧、碳同位素展开分析，以补充针对底栖有孔虫（benthic foraminifers）与浮游有孔虫（planktonic foraminifers）的同类分析工作。该细组分通常主要由颗石（coccoliths）构成，开展细组分同位素分析的目的在于补充有孔虫类的相关分析。由此生成的同位素曲线可揭示仅通过底栖有孔虫与浮游有孔虫分析无法识别的古海洋学变化。[…]