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.

雷恩9527075阿斯金9527013 摘要 罗伯茨角项目（CRP）旨在对罗斯海西部的海底沉积物进行取芯，其年龄范围为晚白垩世中期至中新世早期。将从一个每年漂浮在100至500米水深的海冰平台上采集4500米长的岩心。 岩心将在两个为期45天的钻探季节（1996年11月和1997年11月）内对1500米厚的复合地层剖面进行取样。 船上的地球物理测量已经确定了一个倾斜的沉积地层包，解释为在年龄上是不稳定的中新世。 一层薄薄的年轻沉积物覆盖在这些岩层上。 在罗斯海、跨南极山脉或东南极洲的其他地方，都没有发现这种年龄范围的岩石。 因此，回收的该时代沉积物对于解释白垩纪-新生代期间南极地质、生物、气候和构造历史至关重要。CRP的目标包括获得晚白垩世-新生代的古气候记录，研究冰川-冰消和真冰期旋回，确定冈瓦纳大陆的解体和罗斯海海湾的裂谷历史。 在每个钻井现场进行岩心描述和井下实验。 一个由生物地层学家、沉积学家、磁性地层学家、岩石学家等组成的国际小组将在南极罗斯岛麦默多站设备齐全的克拉里科学和工程中心（CSEC）进行钻探期间和钻探后立即对岩心及其成分进行初步表征。 已被证明是宝贵的工具，生物地层学和古环境的解释年轻的罗斯海序列钻在罗斯海海湾。 它们包括海洋（dinocytes）和非海洋（孢子，花粉）类型，记录了广泛而多样的地质信息，并保存在各种不同的岩相中，形成于各种古环境。 该奖项支持与新西兰孢粉学家合作，对CRP岩心进行初步的孢粉学表征。 所有样本将在CSEC中使用聚焦微波消化装置进行处理，以实现最大的安全性和效率。 分析将侧重于提供一个综合的生物地层学和古环境框架的基础上，所有微体化石组存在的孢粉输入。 这一关键框架对今后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具有根本重要性。 孢粉学还将为CRP的主要目标提供重要数据：气候变化、古气候、热历史和构造历史。 未来的孢粉学研究包括古环境，植被和气候变化，分类，南部海洋和陆地植物区系的演变，特有性，扩散和古生物地理学，灭绝事件等主题。