Collaborative Research: Paleomagnetic and Mineral Magnetic Characterization of Drill-Cores from the Cape Roberts Project (OSU Component)

Verosub 9526889 Wilson 9527343 摘要 罗伯茨角计划（CRP）的目标是阐明从白垩纪到渐新世的冈瓦纳大陆太平洋边缘的碎裂历史和南极冰川的历史。 CRP将根据一项综合科学计划运作，其中所有岩心的初步科学定性将在连续两年的两个钻探季节在南极的麦默多站进行。 每个钻探季节将持续两个月，其运作方式与大洋钻探计划的两个月巡航大致相同。 与岩心表征有关的科学活动将包括磁性地层学、生物地层学、岩石学、矿物学和沉积学。 在这样一个项目中，年龄测定是最重要的，因为时间框架是获得气候和构造事件历史所必需的。 该奖项支持一项研究计划，该计划将通过适当的矿物磁性研究确定高质量的古地磁地层学，以支持CRP。 对于现场磁性研究，该奖项将：对整个岩心磁化率进行测井，这将有助于在CRP期间将回收的几个重叠岩心进行对比;确定用于岩心定年的磁性地层框架;进行矿物磁性和环境磁性研究，以评估古地磁信号的可靠性;并确定环境磁性是否能提供有关构造、沉积、成岩或气候变化对罗伯茨角沉积记录影响的信息。 详细的环境和矿物磁性研究也将有助于对作为地磁场记录器的沉积物进行评价。 罗伯茨角的记录提供了获得罕见的高南纬度对地磁场行为的限制的可能性。 古地磁研究还应提供有关罗斯海部分地壳运动和裂谷发展的重要数据。

Verosub OPP 9526889 Wilson OPP 9527343 Abstract The goals of the Cape Roberts Project (CRP) are to elucidate the history of fragmentation of the Pacific margin of Gondwana and the history of Antarctic glaciation from Cretaceous through Oligocene time. The CRP will operate with an integrated science plan in which all of the initial scientific characterization of the cores will be done at McMurdo Station in the Antarctic during two drilling seasons over two successive years. The drilling seasons will each be of two months duration and will operate in much the same manner as two month cruises of the Ocean Drilling Program. The scientific activities associated with characterization of the cores will include magnetostratigraphy, biostratigraphy, petrography, mineralogy, and sedimentology. Age determination is of principal importance in such a project because a temporal framework is necessary to obtain a history of climatic and tectonic events. This award supports a program of research which will enable determination of a high-quality paleomagnetic stratigraphy, with the appropriate mineral magnetic studies, in support of the CRP. For the on-site magnetic studies this award will: undertake logging of the whole-core magnetic susceptibility which will assist in correlation of the several overlapping cores to be recovered during the CRP; determine a magnetostratigraphic framework for dating of the cores; undertake mineral magnetic and environmental magnetic studies to assess the reliability of the paleomagnetic signal; and determine if environmental magnetic properties yield information concerning changes in the tectonic, sedimentologic, diagenetic or climatic influences on the sedimentary record at Cape Roberts. Detailed environmental and mineral magnetic studies will also enable evaluation of the sediments as recorders of the geomagnetic field. The Cape Roberts records provide the potential to obtain rare high southern latitude constraints on geomagne tic field behavior. Paleomagnetic studies should also provide important data concerning crustal movements and rift development in the Ross Sea sector.