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

Krissek OPP 9527008 Powell OPP 9527481摘要一项在南极洲麦克默多海峡罗伯茨角海域采集1500米钻芯的国际倡议，旨在更好地了解晚白垩世和早新生代的南极历史。从冈瓦那冰川最终解体前到南极冰川开始这段时间内发生的事件，现有数据并不能很好地界定。罗伯茨角项目(CRP)旨在提供有关南极西部裂谷系统的发展、罗斯海的沉降史以及这一关键时间间隔内南极冰盖波动的新数据。必须更好地记录这些区域事件，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，及其对陆地和海洋的影响；2)通过冈瓦那构造对区域和全球的影响，对保存这种气候记录的影响。部分是对之前南极大陆边缘钻探工作的延伸，部分是为了更完整地记录南极和南太平洋地区罗斯海部分通过晚白垩世-早新生代的发展历史而提出的一项新倡议。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发展，并将利用新汇编的地球物理数据库。合作伙伴关系是一项合作努力，目前正得到六个参与国的支持。该奖项支持美国对钻探岩心的地层测井和初步沉积学特征的贡献。未来，对更具体研究目标的追求将通过科学家个人的提议来实现。拟议工作涉及的任务将包括地层层序的初步描述和特征；这些结果将用作其他分析的基本数据库。地层剖面还将用作模拟观测到的海洋和地球物理事件的参考剖面。层序的初步沉积学特征将允许定义相、构建相序列和解释随时间推移的沉积环境。拟议工作的最终结果将是为每个钻探季节编写一份海洋钻探计划风格的初步报告。这些报告将包括地层测井、初始相和沉积体系解释、沉积岩石学和岩石成因分析以及初步粘土矿物学分析。报告还将包括其他专家提供的信息，包括生物地层学、磁性地层学、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.