Collaborative International Research: Investigation of Structures, Structural Fabrics and Metamorphic Associations in Northern Victoria Land

国际合作研究：维多利亚州北部土地的结构、结构织物和变质关联的调查

• 批准号: 9702161
• 负责人: Christine Siddoway
• 金额: $ 1.8万
• 依托单位: Colorado College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-02-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9702161&HistoricalAwards=false
• 关键词: Collaborative; International; Research; Investigation; Structures

9702161 Siddoway Abstract This award allows a US investigator to join an Italian Antarctic Program geological field team in northern Victoria Land, Antarctica. The overall goal of the field program is to obtain detailed structural, petrographic, isotopic, and geochronological information that bears on the history of early Paleozoic magmatism in northern Victoria Land (NVL), and to relate this information to plate convergence during the Ross Orogeny. The group will test the hypothesis that high temperature-low pressure metamorphism in NVL occurred within the regional contact metamorphic aureole of fundamentally arc-related plutons, within a structural regime related to convergence. Detailed structural studies by the PI are expected to help characterize the dynamic setting in which the plutons were emplaced and correlate structural fabrics in host rock with changes in pressure- temperature conditions of metamorphic recrystallization in host rocks. The work will be used to verify the polarity of the magmatic arc during plutonism and establish the relationships with early Paleozoic plutons to the south. The results of this work will be used to infer the configuration of AntarcticaOs early Paleozoic active margin in NVL, for comparison with models developed in other parts of the Transantarctic Mountains. Interpretations developed in the course of this work will be integrated with tectonic and structural interpretations for other parts of the proto-Pacific margin of Gondwana. Methods used in the study will include structural mapping, structural and metamorphic petrology, and fluid inclusion analysis. The field program in \centered on the Deep Freeze Range, with an additional possibility of examining sites in the vicinity of the Lanterman Range. The specific contribution supported by this award will be study and interpretation of the relations between deformation, magmatic pulses, and high temperature-low pressure metamorphic recrystallization.

9702161 Siddoway摘要该奖项允许美国调查员加入南极北维多利亚州北部的意大利南极计划地质田地团队。 该现场计划的总体目标是获得详细的结构，岩石学，同位素和年代学信息，这些信息涉及维多利亚州北部（NVL）早期古生代岩浆症的历史，并将这些信息与plate造口造口期间的板块收敛相关联。 该组将检验以下假设：NVL中的高温压力变质发生在与收敛有关的结构性状态内的基本弧相关岩体的区域接触变质元素内发生。预计通过PI进行的详细结构研究有助于表征岩体中岩体的动态设置，并将宿主岩石中的结构织物与宿主岩石变质重结晶的压力温度条件的变化相关联。 这项工作将用于验证岩石弧菌期间岩浆弧的极性，并建立与早期古生素岩石的关系。 这项工作的结果将用于推断NVL中南极早期活性缘的构型，以与在跨北极山脉其他地区开发的模型进行比较。 在这项工作过程中开发的解释将与冈瓦纳原始太平洋边缘其他部分的构造和结构解释集成。 研究中使用的方法将包括结构图，结构和变质岩石学以及流体包容分析。 \中心的现场程序以深度冻结范围为中心，还有一些可能在兰特曼范围附近检查地点的可能性。 该奖项支持的具体贡献将是研究和解释变形，岩浆脉冲和高温压力变质的重结晶之间的关系。