Small Grant for Exploratory Research - Paleomagnetic and Mineral Magnetic Studies in Anticipation of the Cape Roberts Project

该奖项支持一个项目，该项目为开发可靠的磁地层记录奠定基础，这些记录来自国际罗伯茨角项目（CRP）收集的钻芯。可靠的年代地层格架是正确解释气候和构造事件的先决条件，而气候和构造事件是CRP研究的重点。磁地层学可能在该框架的发展中发挥重要作用，但之前对南极洲沉积序列的古地磁研究表明，从CRP岩心中提取可靠的磁地层学可能并不容易，并且可能需要对样品进行复杂的处理。本项目将对1984/85年在麦克默多湾西部采集的CIROS-1岩心下部（始新世和/或渐新世）进行古地磁和矿物地磁调查。除了可以从该岩心中提取有关古环境的有用信息外，这项工作还提供了一个机会，可以获得有关罗伯茨角地区岩性的古地磁经验，并解决以前尝试恢复古地磁记录时遇到的问题。该项目还将利用来自新西兰附近大南盆地的白垩纪至古新世钻井岩屑。在时间和资源都非常有限的情况下，这项工作的结果将允许确定在CRP的钻孔和基本表征阶段处理样品的最适当策略。这样，将大大提高支持岩心基本表征工作的现场古地磁调查的效率。

Abstract This award supports a project to lay the groundwork for development of a reliable magnetostratigraphic record from drill core collected by the international Cape Roberts Project (CRP). A reliable chronostratigraphic framework is a prerequisite for proper interpretation of the climatic and tectonic events that are the focus of the CRP. Magnetostratigraphy could play a major role in development of that framework, but previous paleomagnetic studies of sedimentary sequences from Antarctica have shown that extracting a reliable magnetostratigraphy from the CRP cores may not be easy and that sophisticated treatment of samples may be necessary. This project will undertake paleomagnetic and mineral magnetic investigations of the lower part (Eocene and/or Oligocene) of the CIROS-1 core, which was collected in 1984/85 from western McMurdo Sound. In addition to useful information bearing on paleoenvironments that can be extracted from this core, this work provides an opportunity to gain paleomagnetic experience with the lithologies present in the Cape Roberts region and to address problems encountered in previous attempts to recover paleomagnetic records. This project will also utilize Cretaceous to Paleocene drill cuttings from the Great South Basin near New Zealand. The results of this work will allow determination of the most appropriate strategy for dealing with samples during the drilling and basic characterization phase of the CRP, when time and resources will be very limited. In this way, the efficiency of on site paleomagnetic investigations in support of the basic characterization work on the core should be greatly enhanced.