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

合作研究：罗伯茨角项目（OSU 组成部分）钻芯的古地磁和矿物磁表征

• 批准号: 9527343
• 负责人: Gary Wilson
• 金额: $ 8.12万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-01 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527343&HistoricalAwards=false
• 关键词: Collaborative; Research; Paleomagnetic; Mineral; Magnetic

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.

Verosub OPP 9526889威尔逊OPP 9527343罗伯茨角项目的目标是阐明冈瓦那太平洋边缘从白垩纪到渐新世的碎裂历史和南极冰川的历史。中央气象局将按照一项综合科学计划运作，根据该计划，南极麦克默多站将在连续两年的两个钻探季节对岩芯进行所有初步科学表征。每个钻探季节将持续两个月，并将以与海洋钻探计划两个月巡航大致相同的方式运作。与岩心特征相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。年龄确定在这一项目中至关重要，因为时间框架对于获得气候和构造事件的历史是必要的。该奖项支持一项研究计划，该计划将能够确定高质量的古地磁地层学，并进行适当的矿物磁性研究，以支持CRP。对于现场磁学研究，该奖项将：对整个岩心的磁化率进行记录，这将有助于在CRP期间恢复的几个重叠岩心的对比；确定岩心测年的磁性地层框架；开展矿物磁学和环境磁学研究，以评估古地磁信号的可靠性；以及确定环境磁性是否产生关于构造、沉积学、成岩作用或气候变化对罗伯茨角沉积记录的影响的信息。详细的环境和矿物磁学研究还将使对沉积物作为地磁场记录器的评估成为可能。罗伯茨角的记录提供了获得罕见的南部高纬度对地磁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地区地壳运动和裂谷发展的重要数据。