Permian and Triassic Palynostratigraphy of the Central Transantarctic Mountains

横贯南极中部山脉的二叠纪和三叠纪孢粉地层学

• 批准号: 9418093
• 负责人: Rosemary Askin
• 金额: $ 14.5万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-06-01 至 1999-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418093&HistoricalAwards=false
• 关键词: Permian; Triassic; Palynostratigraphy; Central; Transantarctic

This award supports a project to establish a palynostratigraphic framework for the Permian to Triassic sedimentary rocks of the central Transantarctic Mountains. This will help provide a chronostratigraphic reference for Antarctic studies. Palynomorph data can also add to knowledge of the composition of the Permian and Triassic floras and has important biogeographic and paleoclimatic implications. This research will give a clearer picture of the timing and nature of southern high latitude biotic and climatic changes which are vital for understanding causes and effects of the end- Permian global biotic crisis and mass extinctions. This work will concentrate on the Shackleton Glacier area and includes one field season to collect samples and two years of laboratory work. Existing rock collections as well as samples collected by other geologists working in the Shackleton Glacier region will also be utilized to obtain as complete a stratigraphic section as possible. Correlations will be made with other parts of Gondwana and palynological data will be integrated with other fossil and lithologic data to establish a sound, process related stratigraphic framework. Field work will focus on the post-glacial sedimentary units of the Victoria Group (Beacon Supergroup): the Mackellar, Fairchild, Fremouw, and Falla Formations, and their equivalents. Except for marginally brackish, inland-sea Mackellar beds, the succession consists of fluvial and lacustrine deposits. Palynomorphs in these rocks are almost entirely spores and pollen from land plants, with occasional acritarchs. The zonation will build upon and formalize the preliminary zonation established previously for southern Victoria Land. Fossil spore and pollen assemblages can indicate their parent plants and thus reflect at least part of the indigenous vegetation. This information can be added to other plant fossil (leaves, wood, et cetera) and paleosol data for paleoclimatic interpretations. Certain p alynomorph taxa (and assemblages) have specific biogeographical or environmental implications. Furthermore, stratigraphic and geographic distribution patterns of the palynomorphs yield information on evolutionary trends and rates, provincialism of the floras, and dispersal pathways.

该奖项支持一个项目，为二叠纪为二叠纪的三叠纪沉积岩石建立了一个帕尔森地层学框架。 这将有助于为南极研究提供年度地层学参考。 palynomorph数据还可以增加对二叠纪和三叠纪植物园组成的知识，并具有重要的生物地理和古气候意义。 这项研究将更清楚地了解南部高纬度生物和气候变化的时机和性质，这对于理解最终二叠纪全球生物危机和大规模灭绝的原因和影响至关重要。 这项工作将集中在沙克尔顿冰川地区，包括一个野外季节，以收集样品和两年的实验室工作。 现有的岩石收集以及在沙克尔顿冰川地区工作的其他地质学家收集的样品也将用于尽可能完整的地层区域。 相关性将与冈瓦纳的其他部分建立，并将寄生数据与其他化石和岩性数据集成在一起，以建立与过程相关的地层框架。 现场工作将重点关注维多利亚集团（Beacon Supergroup）的冰川后沉积单元：麦克拉尔（Mackellar），费尔柴尔德（Fairchild），弗雷莫（Fremouw）和法拉（Falla）阵型及其同等产品。 除了微不足道的内陆麦克雷尔床外，该继承包括河流和湖泊沉积物。 这些岩石中的palynomorphs几乎完全是陆上植物的孢子和花粉，偶尔会出现Acritarch。 分区将建立在先前为维多利亚州南部土地上建立的初步分区基础上。 化石孢子和花粉组合可以表明其母植物，因此至少反映了土著植被的至少一部分。 可以将此信息添加到其他植物化石（叶子，木材等）和古气候解释的古数据中。 某些P alynomorph分类单元（和组合）具有特定的生物地理或环境影响。 此外，palynomorphs的地层和地理分布模式产生了有关进化趋势和速率，植物群的省级和分散途径的信息。