Collaborative Research: Late Wenlock-Ludlow (Silurian) Oceanic Episodes and Events, Southern Laurentia

合作研究：南劳伦西亚晚期温洛克-勒德洛（志留纪）海洋事件和事件

• 批准号: 0517976
• 负责人: James Barrick
• 金额: $ 16.61万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0517976&HistoricalAwards=false
• 关键词: Collaborative; Research; Late; Wenlock; Ludlow

Several similar models of global climate and oceanic change have been proposed since 1990 to explain lithologic, eustatic, biotic and geochemical events recorded from Silurian strata. The first, and still most prominent, of the models is that of Jeppsson, who subdivided the Silurian into a series of oceanic states separated by short-lived oceanic events, during which dramatic changes, including faunal extinctions related to drops in primary productivity, occurred. Nearly all of the detailed documentation of the models comes from the Baltic region.Testing these models requires that additional Silurian events be examined. The team will examine a span of Silurian time that includes two major events (Mulde and Lau), a minor event (Linde) and a series of shifts between oceanic episodes for which no significant 'events' have been recorded. The data will come from sections that span 3000 km across southern Laurentia, which was located distant from Baltica during the Silurian.The research will yield a reconstruction of the depositional, biotic, and geochemical history for an interval of approximately 5.0 my across the southern craton of Laurentia and extending into basins proximal to the Appalachian orogenic area. This will allow for evaluation of geographic trends in biological and geochemical factors related to water circulation from near the cratonic margin across an epeiric sea and into basins that were more or less well connected to the global ocean and were interacting with tectonic events. This will comprise the first analysis of regional expression of Silurian oceanic changes, and will also provide the detailed documentation required for in-depth comparison to sections associated with Baltica. A far better understanding of the nature of the stratigraphic record of climatic and oceanic change for the Silurian, and thereby also the Paleozoic, will result. Data will be reposited, including unprocessed samples for additional analyses (chitinozoan, palynomorphs, Sr-isotopes, etc.), and information made available for inclusion in a dynamic, interactive and time-calibrated network, such as the CHRONOS project.

自1990年以来，已经提出了几种类似的全球气候和海洋变化模型，以解释志留纪地层记录的岩性，eustatic，生物和地球化学事件。模型中的第一个也是最突出的是耶普森（Jeppsson）的模型，他将志留纪（Silurian）细分为一系列由短暂的海洋事件隔开的海洋国家，在此期间发生了巨大的变化，包括与初级生产力下降有关的动物灭绝，发生了巨大的变化。几乎所有模型的详细文档都来自波罗的海地区。测试这些模型要求检查其他志留纪事件。该团队将检查一段寿览会时期，其中包括两个重大事件（Mulde和Lau），一个小事件（Linde），以及在海洋事件之间进行的一系列转变，尚未记录重要的“事件”。数据将来自横跨劳伦蒂亚南部3000公里的部分，该区域位于志留纪期间远离波罗的海。这项研究将产生沉积，生物和地球化学历史的重建，间隔约5.0，我在5.0我的Laurentia南部craton craton of Laurentia南部，并延伸到盆地，并延伸到Appalachian oppalachian oppalachian oppalachian orenogenatic sopalical coreganic orenogen coregian。这将允许评估与循环的生物学和地球化学因子的地理趋势，从跨层次的海洋循环到循环的水循环以及与全球海洋相关的或多或少良好相关的盆地，并且正在与构造事件相互作用。这将包括对志留纪海洋变化的区域表达的首次分析，还将提供与与波罗的海相关的部分进行深入比较所需的详细文档。对志留纪的气候和海洋变化的地层记录的性质有更好的理解，从而使古生代也将产生。数据将被重新销售，包括未加工的样品进行其他分析（Chitinozoan，palynomorphs，sr-异位素等），并提供了可用于包含在动态，交互和时间校准的网络中的信息，例如Chronos Project。