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.

该奖项支持为横贯南极山脉中部二叠纪至三叠纪沉积岩建立孢粉地层框架的项目。 这将为南极研究提供年代地层参考。 孢粉形态数据还可以增加对二叠纪和三叠纪植物区系组成的了解，并具有重要的生物地理学和古气候意义。 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间和性质，这对于理解二叠纪末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，包括一个野外季节收集样本和两年的实验室工作。 现有的岩石收藏以及在沙克尔顿冰川地区工作的其他地质学家收集的样本也将用于获得尽可能完整的地层剖面。 将与冈瓦纳大陆的其他部分建立关联，孢粉学数据将与其他化石和岩性数据相结合，以建立一个健全的、与过程相关的地层框架。 现场工作将集中于维多利亚群（Beacon Supergroup）的冰期后沉积单元：Mackellar、Fairchild、Fremouw 和 Falla 地层及其类似地层。 除了微咸水、内海 Mackellar 层外，该层序由河流和湖泊沉积物组成。 这些岩石中的孢粉形态几乎完全是来自陆地植物的孢子和花粉，偶尔也有孢子。 该分区将以先前为维多利亚州南部土地建立的初步分区为基础，并将其正式化。 化石孢子和花粉组合可以表明它们的母体植物，从而反映至少部分本土植被。 该信息可以添加到其他植物化石（叶子、木材等）和古土壤数据中，以进行古气候解释。 某些孢子类群（和组合）具有特定的生物地理或环境影响。 此外，孢粉型的地层和地理分布模式提供了有关进化趋势和速率、植物区系的地域性和扩散途径的信息。