Collaborative Research: Initial Sedimentological Characterization of the Late Cretaceous-Early Cenozoic Drill Cores from Cape Roberts, Antarctica

摘要一项在南极洲麦克默多湾罗伯茨角近海收集1500米岩心的国际倡议，旨在更好地了解白垩纪晚期和新生代早期的南极历史。这一时期的事件，从冈瓦纳大陆最终解体之前一直延伸到南极冰川的开始，现有的资料对这一时期的事件定义不清。罗伯茨角项目（CRP）旨在通过这一关键时间间隔提供有关南极西部裂谷系统发育、罗斯海沉降历史和南极洲冰盖波动的新数据。这些区域性事件必须被更好地记录下来，因为它们具有区域和全球意义，包括：1)对区域和全球气候发展的影响，以及它对陆地和海洋的影响；2)通过冈瓦纳构造的区域和全球影响，对这些气候记录的保存产生影响。CRP在一定程度上是对南极大陆边缘钻探工作的延伸，在一定程度上是一项新的倡议，旨在更完整地记录南极罗斯海地区和南太平洋地区从白垩纪晚期到新生代早期的发展史。它将借鉴以往钻探工作的成功经验，以良好的空间和时间分辨率记录区域和环境的发展情况，并将利用新编制的地球物理数据库。CRP是一项合作项目，目前得到6个参与国的支持。该奖项支持美国在地层测井和钻孔岩心的初始沉积学表征方面的贡献。追求更具体的研究目标将在未来通过个别科学家的建议来完成。拟议工作所涉及的任务将包括地层演替的初步描述和特征；这些结果将作为其他分析的基础数据基础。地层剖面也将用作模拟观测到的海洋和地球物理事件的参考剖面。序列的初始沉积学特征将允许确定相，构建相序列，并解释沉积环境。拟议工作的最终结果将是每个钻井季节的海洋钻井计划式的初始报告。这些报告将包括地层测井、初始相和沉积系统解释、沉积岩石学和岩石成因分析以及初始粘土矿物学分析。报告也将包括其他专家提供的资料，包括生物地层学、磁地层学、地球物理测井和地球化学解释。这些报告将介绍对区域历史的初步解释，并强调这一历史的区域和全球影响。

Krissek OPP 9527008 Powell OPP 9527481 Abstract An international initiative to collect 1500 m of drill core from offshore of Cape Roberts, McMurdo Sound Antarctica, is intended to provide a better understanding of Antarctic history through the late Cretaceous and early Cenozoic. Events during this period, which extends from before the final breakup of Gondwana through the onset of Antarctic glaciation, are ill-defined by existing data. The Cape Roberts Project (CRP) aims to provide new data about the development of the West Antarctic rift system, the subsidence history of the Ross Sea, and ice sheet fluctuations on Antarctica through this critical time interval. These regional events must be documented better because they have ramifications of regional and global significance, including: 1) impacts on both regional and global climatic development, with its terrestrial and marine effects, and 2) impacts on the preservation of such climatic records through the regional and global influences of Gondwana tectonics. CRP is partly an extension of previous drilling efforts on the Antarctic continental margin, and is partly a new initiative to more completely document the developmental history of the Ross Sea sector of the Antarctic and southern Pacific region through the late Cretaceous - early Cenozoic. It will draw on the successes of previous drilling efforts to document regional and environmental development with good spatial and temporal resolution, and it will also draw upon newly compiled geophysical data bases. CRP is a collaborative endeavor and is currently being supported by six participating countries. This award supports the U.S. contribution to the stratigraphic logging and initial sedimentological characterization of the drill core. Pursuit of more specific research goals will be accomplished via proposals from individual scientists in the future. Tasks involved in the proposed work will include initial description and characterizatio n of the stratigraphic successions; these results will be used as the fundamental data base for other analyses. The stratigraphic sections will also be used as reference sections for modeling observed marine and geophysical events. Initial sedimentological characterization of the successions will allow the definition of facies, the construction of facies sequences, and the interpretation of depositional environments through time. The end result of the proposed work will be an Ocean Drilling Program-style initial report for each drilling season. These reports will include the stratigraphic log, initial facies and depositional system interpretations, sedimentary petrologic and petrogenetic analyses, and initial clay mineralogical analysis. Information provided by other specialists will also be included in the reports, including biostratigraphy, magnetostratigraphy, geophysical logs and geochemical interpretations. The initial interpretations of regional history will be presented in these reports, and the regional and global ramifications of this history will be highlighted.