Collaborative Research: Initial Palynological Characterization of Cape Roberts Drill Cores

合作研究：罗伯茨角钻芯的初步孢粉学特征

• 批准号: 9527013
• 负责人: Rosemary Askin
• 金额: $ 6.59万
• 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: 1996-05-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527013&HistoricalAwards=false
• 关键词: Collaborative; Research; Initial; Palynological; Characterization

Wrenn OPP 9527075 Askin OPP 9527013 Abstract The Cape Roberts Project (CRP) is designed to core submarine deposits in the western Ross Sea that range in age from middle Late Cretaceous-early Miocene. Four, 500m long drillcores will be taken from a platform of annual sea ice floating in water depths ranging from 100 to 500m. The cores will sample a composite stratigraphic section 1500m thick during two, 45-day-long drilling seasons (October-November 1996 and 1997). Shipboard geophysical surveys have identified a package of dipping sedimentary strata interpreted to be Cretaceous-Miocene in age. A thin blanket of younger sediments overlies these beds. Rocks of this age range are not known from the Ross Sea, the Transantarctic Mountains or elsewhere in East Antarctica. Thus, recovered sediments of this age have prime importance for interpreting Antarctic geologic, biologic, climatic and tectonic history during the Cretaceous-Cenozoic. Objectives of CRP include obtaining a late Cretaceous-Cenozoic paleoclimatic record, studying glacial-deglacial and eustasy cycles, and determining the Gondwana breakup and rifting history of the Ross Sea embayment. Core description and downhole experiments will be conducted at each drill site. An international team of biostratigraphers, sedimentologists, magnetostratigraphers, petrologists, etc. will conduct initial characterization of the cores and their constituents during and immediately following drilling at the fully equipped Crary Science and Engineering Center (CSEC), McMurdo Station, Ross Island, Antarctica. Palynomorphs have proven to be invaluable tools for biostratigraphic and paleoenvironmental interpretation of younger Ross Sea sequences drilled in the Ross Sea Embayment. They include both marine (dinocysts) and nonmarine (spores, pollen) types, record extensive and diverse geologic information, and are preserved in a wide variety of lithofacies formed in various paleoenvironments. This award suppor ts initial palynological characterization of the CRP drillcores, in collaboration with New Zealand palynologists. All samples will be processed in the CSEC using a focused mircowave digestion unit for maximum safety and effieciency. Analyses will focus on providing palynological input for an integrated biostratigraphic and paleoenvironmental framework based on all microfossils groups present. This critical framework is of fundamental importance to all future geologic, geophysical and paleontologic studies conducted on the cores and in the drilling area. Palynology will also provide vital data for prime CRP objectives: climate change, eustasy, and thermal and tectonic history. Future palynologic studies of the cores include such topics as paleoenvironments, vegetational and climatic change, taxonomy, evolution of southern marine and terrestrial floras, endemism, dispersal and paleobiogeography, and extinction events.

Wrenn OPP 9527075 Askin OPP 9527013 摘要 罗伯茨角项目 (CRP) 旨在对罗斯海西部的海底矿床进行取芯，这些矿床的年龄范围为晚白垩世中期至中新世早期。将从漂浮在水深 100 至 500 m 的年度海冰平台上采集四个 500 m 长的钻芯。 岩心将在两个为期 45 天的钻探季节（1996 年 10 月至 11 月和 1997 年）对 1500m 厚的复合地层剖面进行取样。 船上地球物理调查发现了一组倾斜沉积地层，其年龄被解释为白垩纪-中新世。 这些床上覆盖着一层薄薄的较年轻的沉积物。 在罗斯海、横贯南极山脉或东南极洲的其他地方，尚未发现这个年龄范围的岩石。 因此，恢复的这个时代的沉积物对于解释白垩纪-新生代南极地质、生物、气候和构造历史至关重要。 CRP 的目标包括获得白垩纪晚期-新生代古气候记录、研究冰期-冰消期和海平面循环以及确定冈瓦纳大陆的分裂和罗斯海海湾的裂谷历史。 将在每个钻探地点进行岩心描述和井下实验。 由生物地层学家、沉积学家、磁力地层学家、岩石学家等组成的国际团队将在南极洲罗斯岛麦克默多站设备齐全的克雷科学与工程中心 (CSEC) 钻探期间和钻探后立即对岩心及其成分进行初步表征。 孢粉形态已被证明是对在罗斯海海湾钻探的年轻罗斯海层序进行生物地层学和古环境解释的宝贵工具。 它们包括海洋（双囊）和非海洋（孢子、花粉）类型，记录了广泛多样的地质信息，并保存在各种古环境中形成的各种岩相中。 该奖项支持与新西兰孢粉学家合作对 CRP 钻芯进行初步孢粉学表征。 所有样品都将在 CSEC 中使用聚焦微波消解装置进行处理，以实现最大的安全性和效率。 分析将侧重于为基于所有现有微化石群的综合生物地层和古环境框架提供孢粉学输入。 这一关键框架对于未来在岩心和钻探区域进行的所有地质、地球物理和古生物学研究都至关重要。 孢粉学还将为 CRP 的主要目标提供重要数据：气候变化、安稳以及热和构造历史。 未来对岩心的孢粉学研究包括古环境、植被和气候变化、分类学、南部海洋和陆地植物群的演化、特有现象、扩散和古生物地理学以及灭绝事件等主题。