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

摘要 该奖项支持了一个项目，该项目为从国际罗伯茨角项目（CRP）收集的岩心中开发可靠的磁性地层记录奠定了基础。 一个可靠的年代地层框架是正确解释气候和构造事件的先决条件，这些事件是CRP的重点。 磁性地层学可以在该框架的发展中发挥重要作用，但以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性地层学可能并不容易，可能需要对样品进行复杂的处理。 该项目将对1984/85年从麦克默多海峡西部采集的CIROS-1岩心的下部（始新世和/或渐新世）进行古地磁和矿物磁性调查。 除了有用的信息，可以从这个核心提取的古环境轴承，这项工作提供了一个机会，以获得与罗伯茨角地区的岩性古地磁经验，并解决以前的尝试中遇到的问题，恢复古地磁记录。 该项目还将利用新西兰附近大南盆地的白垩纪至古新世钻屑。 这项工作的结果将有助于确定在时间和资源非常有限的CRP钻探和基本表征阶段处理样品的最适当战略。 这样，支持岩心基本特征鉴定工作的现场古地磁调查的效率将大大提高。

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.