A Detailed Model of Cenozoic Sedimentation in the Central North Pacific

在接下来的两年里，我们计划开发、完善和测试北太平洋中部沉积历史的详细模型。有了这个模型，我们将能够描述目前知之甚少的大量微量元素和微量元素的海洋地球化学行为。该模型将基于详细的数据库，包括所有可用的活塞岩心LL44-GPC3的化学、地层、矿物学和物理数据。本研究与其他先前的远洋粘土序列研究的主要区别在于化学数据库的大小和时间分辨率，其中包括分析了代表过去70 Ma的-450个样品的39种元素。这些数据将使我们能够以更高的精度区分更多的沉积化学成分，比以往任何对远洋粘土的研究都要高得多的地层分辨率。由此产生的沉积模型将提供一个详细的、内部一致的、可测试的构造、气候、海洋和成岩过程的图像，这些过程在过去70万年中影响了北太平洋中部。我们相信，最终的地球化学模型与大量可用的岩心辅助数据相结合，也将使沉积学家在理解远洋粘土序列的化学、矿物学、岩石磁性和物理性质之间的关系方面取得巨大飞跃。

During the next two years we propose to develop, refine and test a detailed model of the sedimentation history of the central North Pacific. With this model we will be able to characterize the marine geochemical behavior of a large number of minor and trace elements which are presently poorly understood. The model will be based on a detailed data base including all available chemical, stratigraphic, mineralogic and physical data for piston core LL44-GPC3. The primary difference between this study and other previous studies of pelagic clay sequences, is the size and temporal resolution of the chemical database which includes analyses of 39 elements of -450 samples representing the last 70 Ma. These data will allow distinction of more sedimentary chemical components with greater precision and much greater stratigraphic resolution than any previous study of pelagic clays. The resulting sedimentation model will provide a detailed, internally consistent, and testable picture of the tectonic, climatic, oceanic, and diagenetic processes which have affected the central North Pacific over the last 70 Ma. We believe that the final geochemical model when combined with the extraordinary amount of ancillary data available for the core will also allow sedimentologists to make a quantum leap in the understanding the relationships between the chemistry of pelagic clay sequences, their mineralogy, their rock magnetic properties, and their physical properties.