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.

智力优势：位于南极洲玛丽伯德地的北方福特山脉记录了一系列事件和过程，这些事件和过程将大量由钙碱性深成岩侵入的下古生代浊积岩转化为冈瓦纳沿着边缘的分异大陆地壳。在这项研究中，福斯迪克混合岩？花岗岩杂岩将通过野外工作、构造地质学、岩石学、矿物平衡模拟、地质年代学和地球化学的综合方案来研究地壳演化。PI建议在复杂的四个地点进行详细的穿越，以调查古生代和中生代造山旋回。他们将利用寄主片麻岩和浅色花岗岩的岩石学组合、结构几何学和显微结构来区分残余熔体流动网络的迁移和聚结模式，并进行详细的取样以进行地质年代学、地球化学和同位素研究。将对基性岩深成相进行取样，以获取有关源区地幔贡献的信息。矿物平衡模拟的源岩和花岗岩产品，结合原位矿物测年，将被用来解决P？T？T？测试造山旋回期间地壳增厚/变薄的轨迹，并研究熔融和熔融损失历史。更广泛的影响：这项工作涉及一名早期职业女性科学家的研究和教育举措，以及博士学位。和本科生。将为高中学生和大学生编制关于跨学科南极科学的教育方案。