RPG: An Investigation of U-Pb Systematics in Conodonts

RPG：牙形刺中 U-Pb 系统学的研究

• 批准号: 9526671
• 负责人: Ellen Martin
• 金额: $ 1.8万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-05-01 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526671&HistoricalAwards=false
• 关键词: RPG; Investigation; Pb; Systematics; Conodonts

Abstract: The proposed investigation of U-Pb dating of fluor-apatite conodont elements may provide a powerful geologic tool for linking biostratigraphic zones with absolute ages. The combination eliminates the need to interpolate boundary ages from absolute ages derived from sporadically distributed igneous rocks. This interpolation is one of the largest sources of error in current absolute geologic time scales. For the pilot study proposed for this planning grant, the PI will date the stage boundaries in the Early Permian, a time when the nomenclature and stratigraphic positions of stage boundaries are generally agreed upon, and for which the PI can obtain abundant conodonts. If successful, the PI will submit a major proposal to extend the approach into the Late Permian, a time when the stage boundaries and duration of stages are subject to constant debate. Resolution of the Late Permian stratigraphic controversies is of particular interest because the time period includes the most extensive Phanerozoic mass extinction, the lowest sea level stands, the end of the Kiaman Reversed Period, and very rapid apparent rates of change in a number of geochemical parameters. Success of this project will give the PI an important new tool to enhance her existing research, which focuses on the interpretation of global climate change recorded by isotopic variations preserved in marine organisms.

摘要：拟议的对氟磷灰石牙形元素的U-PB约会的研究可能提供了一种强大的地质工具，用于将具有绝对年龄的生物地层学区联系起来。 该组合消除了从零散分布的火成岩衍生的绝对年龄插值边界年龄的需求。 该插值是当前绝对地质时间尺度中最大的错误来源之一。 对于本计划赠款提出的试点研究，PI将与早期二叠纪的阶段边界约会，即通常同意阶段边界的命名法和地层位置的时期，并且PI可以获得丰富的牙齿。 如果成功，PI将提交一项重大建议，将方法扩展到晚期二叠纪，这是阶段边界和阶段持续时间持续进行辩论的时候。 晚期二叠纪地层争议的分辨率尤其令人感兴趣，因为时间段包括最广泛的phanerokoic质量灭绝，最低的海平面，凯亚曼（Kiaman）的末端，逆转时期以及许多地球化学参数的明显变化速度非常快。 该项目的成功将使PI成为增强她现有研究的重要新工具，该工具的重点是对海洋生物中的同位素变化记录的全球气候变化的解释。