Petrogenesis and Crustal Structure of Metamorphic Rocks in the Central Transantarctic Mountains: An Integrated Petrologic, Structural and Geochronologic Study

本研究的重点是区域变质作用， 中部前寒武纪基底岩石的变形 南极洲的横贯南极山脉。 这些岩石 重要的是，因为他们包括一些唯一的高等级 出露于横贯南极山脉的基底地形， 代表着古东南极克拉通的一部分 因此，在本发明中， 它们的岩石成因和构造演化对于 更好地了解古南极克拉通是如何演变的 以及冈瓦纳超大陆是如何形成的 的位置 这些靠近西南极洲边缘的岩石 这是一个独特的机会来研究 元古宙和元古宙地盾的元素， 地壳元素沿着会聚的南极板块形成 边界 综合研究变形前寒武纪变质作用 地形将包括：1）详细的野外地质测绘， 取样; 2）结构、显微结构、运动学和组构 变质岩石学及定量分析 包括主元素交换和 氧同位素技术; 4）同位素地质年代学。 的 拟议项目的期限为三年，包括外地 前两年的季节。

This study will focus on the regional metamorphism and deformation of Precambrian basement rocks in the central Transantarctic Mountains of Antarctica. These rocks are significant because they comprise some of the only high-grade basement terrains exposed in the Transantarctic Mountains which represent a part of the ancient East Antarctic craton. As such, their petrogenesis and tectonic evolution are important for a better understanding of how the paleo-Antarctic craton evolved and how the supercontinent Gondwana formed. The position of these rocks near the edge of cratonal West Antarctica provides a unique opportunity to study the relation between the tectonic elements of the Archaen and Proterozoic shield, and younger crustal elements formed along a convergent Antarctic plate boundary. This integrated study of deformed Precambrian metamorphic terrains will involve: 1) detailed field geologic mapping and sampling; 2) structural, microstructural, kinematic and fabric analysis; 3) metamorphic petrology and quantitative geothermobarometry involving both major element exchange and oxygen isotope techniques; and 4) isotopic geochronometry. The duration of the proposed project is three years, including field seasons during the first two years.