Collaborative research: Polyphase Orogenesis and Crustal Differentiation in West Antarctica

合作研究：南极洲西部的多期造山作用和地壳分异

• 批准号: 0944600
• 负责人: Christine Siddoway
• 金额: $ 14.53万
• 依托单位: Colorado College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-15 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0944600&HistoricalAwards=false
• 关键词: Collaborative; research; Polyphase; Orogenesis; Crustal

Intellectual Merit: The northern Ford ranges in Marie Byrd Land, Antarctica, record events and processes that transformed a voluminous succession of Lower Paleozoic turbidites intruded by calc-alkaline plutonic rocks into differentiated continental crust along the margin of Gondwana. In this study the Fosdick migmatite?granite complex will be used to investigate crustal evolution through an integrated program of fieldwork, structural geology, petrology, mineral equilibria modeling, geochronology and geochemistry. The PIs propose detailed traverses at four sites within the complex to investigate Paleozoic and Mesozoic orogenic cycles. They will use petrological associations, structural geometry, and microstructures of host gneisses and leucogranites to distinguish the migration and coalescence patterns for remnant melt flow networks, and carry out detailed sampling for geochronology, geochemistry and isotope research. Mafic plutonic phases will be sampled to acquire information about mantle contributions at the source. Mineral equilibria modeling of source rocks and granite products, combined with in situ mineral dating, will be employed to resolve the P?T?t trajectories arising from thickening/thinning of crust during orogenic cycles and to investigate melting and melt loss history. Broader impacts: This work involves research and educational initiatives for an early career female scientist, as well as Ph.D. and undergraduate students. Educational programs for high school audiences and undergraduate courses on interdisciplinary Antarctic science will be developed.

知识分子的优点：南极洲玛丽·伯德（Marie Byrd）的北福特（Northern Ford）范围，记录事件和过程，这些事件和过程改变了巨大的下古生代浊质属，被骨血碱性岩石侵入沿冈瓦纳（Gondwana）缘的大陆壳中。在这项研究中，Fosdick Migmatite？花岗岩复合物将用于通过综合的现场工作，结构地质学，岩石学，矿物质平衡建模，地质学和地球化学来研究地壳进化。 PI在复合物中的四个地点提出了详细的遍历，以研究古生代和中生代的造山循环。他们将使用岩石学片麻岩和叶核酸群的岩石学关联，结构性几何形状以及微观结构来区分残留熔体流动网络的迁移和聚结模式，并进行详细的抽样，以进行地质学，地球化学和同位素研究。将对镁铁质型岩石阶段进行采样，以获取有关来源地幔贡献的信息。源岩石和花岗岩产物的矿物质平衡模型，结合原位矿物约会，将用于解析造成山地循环期间外壳增厚/稀疏产生的P轨迹，并研究融化和融化和融化损失历史。更广泛的影响：这项工作涉及早期职业女科学家以及博士学位的研究和教育计划。和本科生。将开发针对高中受众和本科课程的跨学科科学课程。