A Strontium, Oxygen and Carbon Isotopic Study of Cenozoic Marine Biogenic Carbonate from Antarctica

这项研究将证明生物成因碳酸盐的锶、碳和氧同位素比值在测定冰川岩环境中沉积物的年龄和解释南极大陆架的古气候条件方面的作用。该奖项将支持对从南极洲几个钻孔和露头发现的渐新世至近期沉积物中的有孔虫和双壳类进行的同位素(锶、氧和碳)研究。基于锶同位素分析的年龄估计将提供有关南极洲沉积和冰川过程的有用信息，并允许对冰川岩层序进行对比，并有助于将它们与低纬沉积序列进行对比。这项研究的目的是提供有关南极边缘海新生代气候的直接信息，目前尚缺乏这方面的信息。古海洋学将从氧和碳同位素比率中推断出来。南极双壳类和有孔虫的同位素数据将与低纬度和高纬度地区新生代地表和深水的公开记录进行比较。这将澄清世界海洋中世界底水的形成来源以及高低纬度气候之间的关系。

This study will demonstrate the usefulness of strontium, carbon, and oxygen isotopic ratios of biogenic carbonate for dating sediments from glaciomarine environments and interpreting paleoclimatic conditions in Antarctic continental shelves. The award will support an isotopic (strontium, oxygen and carbon) study of foraminifera and bivalves from sediments of Oligocene to Recent age recovered from several drillholes and outcrops on Antarctica. Age estimates based on Sr isotope analyses will provide useful information about sedimentary and glacial processes in Antarctica, as well as permit correlation of glaciomarine sequences and assist in their correlation to lower latitude sedimentary successions. It is the goal of this study to provide direct information about the Cenozoic climate of Antarctic marginal seas, which is presently lacking. Paleoceanography will be inferred from oxygen and carbon isotope ratios. Isotopic data from Antarctic bivalves and foraminifera will be compared with published records for Cenozoic surface and deep waters at low and high latitudes. This will clarify the sources of bottom water formation in the world in the world ocean and the relation between high and low latitude climates.