Cruise to Detroit Seamount, NW Pacific, for Sediment Coring and ODP Site Survey

大多数关于底栖有孔虫地球化学的古海洋学研究都集中在北大西洋，因为该地区沉积物中有丰富的化石遗迹，而且该地区作为海洋深水的重要来源。微古生物学和地球化学研究表明，该地区在冰期/间冰期发生了重大的深环流变化。相比之下，人们对北太平洋的环流知之甚少，因为这些变化的微化石记录在该地区的深水沉积物中保存得很差。然而，最近对浅层沉积物的研究结果表明，在冰川条件下，北太平洋可能是中水或深水的来源。目前的拨款将支持一个实地和实验室项目，收集和分析来自最北端皇帝海底山链的沉积物。野外项目的目标是从底特律海山地区收集岩心的深度样带，并使用地球化学和古生物学技术来建立北太平洋的古水文。实验室分析将包括碳-14和Cd/Ca比率。岩芯将在华盛顿号房车的一次单独资助的巡游中收集。这个项目的结果将对制定北太平洋深海钻探计划具有重要意义。

Most paleoceanographic studies of the geochemistry of benthic foraminifera have concentrated on the North Atlantic because of the abundance of fossil remains in sediments of this region and because of the importance of the region as a source for deep water in the oceans. Micropaleontologic and geochemical studies in this area indicate major deep circulation changes during glacial/interglacial cycles. In contrast, little is known about circulation in the northern Pacific since the microfossil record of these changes is poorly preserved in the deep water sediments of the region. Recent results from shallow sediments, however, suggest that the North Pacific may have been a source of intermediate or deep water during glacial conditions. The present award will support a field and laboratory program to collect and analyze sediments from the northernmost Emperor seamount chain. The objective of the field program is to collect a depth transect of cores from the region of Detroit Seamount and use geochemical and paleontologic techniques to establish the paleohydrography of the north Pacific. Laboratory analyses will include carbon-14 and Cd/Ca ratios. Cores will be collected on a separately funded cruise of the R.V. Washington. The results of this project will be important in formulating plans for deep ocean drilling in the North Pacific.