Boundary Nature of the DUPAL Anomaly in the South Atlantic

两个主要地球化学省之间的边界 地幔位于南极洲全省 位于印度洋上空的异常称为DUPAL异常。 这种异常可能是由于污染的结果 无论是次大陆的拆沉， 冈瓦纳大陆解体和分散过程中的岩石圈 从更深起源的地幔柱的扩散， 地球本项目将进行Nd-Sr-Pb同位素和示踪 从南大西洋海底到大西洋海底的玄武岩元素研究 在时间和空间上确定了 位于南大西洋的杜帕尔省。校长 调查人员将进一步分析他收集的南 大西洋玄武岩在同一玻璃上获得Nd同位素比值 Pb、Sr和He同位素数据已经 同一玻璃上的母/子浓度比 样品和Nd-Sr-Pb系统学，以便 记录了地幔的时空变化

The boundary between two major geochemical provinces in the earth's mantle lies in the South Atantic. The province centered over the Indian Ocean is referred as the DUPAL anomaly. This anomaly may be the result of contamination of the asthemosphere either by delamination of sub-continental lithosphere during the breakup and scatter of Gondwanaland or from the dispersal of mantle plumes of deeper origin within the Earth. This project will undertake a Nd-Sr-Pb isotope and trace element study of asalts from the South Atlantic seafloor to define in time and space the isotopic and geochemical nature of the DUPAL province in the South Atlantic. The principal investigator will further analyze his collection of South Atlantic basalts to obtain: Nd isotopic ratios on the same glass samples on which Pb,Sr, and He isotope data are already available, parent/daughter concentration ratios on the same glass samples, and Nd-Sr-Pb systematics on older basalts in order to document temporal mantle variations.