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

小行星9702161 摘要 该奖项允许一名美国调查员加入意大利南极计划地质实地考察队在南极洲北方维多利亚地。 野外项目的总体目标是获得详细的构造、岩相学、同位素和年代学信息，这些信息与北方维多利亚地（NVL）早古生代岩浆活动的历史有关，并将这些信息与罗斯造山运动期间的板块会聚联系起来。 该小组将检验以下假设，即NVL的高温低压变质作用发生在与会聚有关的结构范围内，基本上与弧有关的岩体的区域接触变质晕内。PI的详细结构研究预计将有助于描述岩体侵位的动力学背景，并将寄主岩石中的结构组构与寄主岩石中变质重结晶的压力-温度条件变化相关联。 这项工作将用于验证岩浆弧的极性在深圳湾和建立与早古生代岩体南部的关系。 本文的研究结果将用于推断NVL地区早古生代活动边缘的形态，并与跨南极山脉其他地区的模式进行比较。 在这项工作的过程中开发的解释将与冈瓦纳古太平洋边缘的其他部分的构造和结构解释相结合。 研究中使用的方法包括构造制图、构造和变质岩石学以及流体包裹体分析。 实地项目以深冻山脉为中心，并有可能对兰特曼山脉附近的地点进行检查。 该奖项支持的具体贡献将是研究和解释变形，岩浆脉冲和高温低压变质重结晶之间的关系。

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.