Dynamic and geochemical evolution of the lithospheric mantle beneath the Western Ross Sea Area, Antarctica

智力优势：大陆岩石圈地幔保存了其构造历史留下的地球化学印记，包括陆壳的提取、陆壳的置换、陆壳的沉积和陆壳的沉积。幼稚？造山或裂谷过程中的软流圈，俯冲相关熔体和流体或地幔柱活动的交代再富集。现代分析技术可以通过全岩、矿物或原位微量元素和Sr-Nd-Hf-Os-He同位素分析来揭示这种地球化学演化。罗斯海西部地区特别适合进行这种研究，因为它具有多阶段构造史的特点。今天，西罗斯海地区是西南极裂谷系（WARS）的一部分，它代表了地球的一部分。最大的裂缝系统。PI建议约束动力学和地球化学演化的次大陆岩石圈地幔使用现代分析技术，使用样品从多个地点之间的山。埃里伯斯省和维多利亚地可通过与以前的探险队和美国极地岩石储存库的调查人员合作。可用的地幔捕虏体是新鲜的，范围从尖晶石二辉橄榄岩到交代的伟尔岩和稀有的镁橄榄石，并且许多携带含水相。更广泛的影响：拟议的工作将产生广泛的科学影响，并将启动国家和国际合作。该项目将构成博士学位的基础。研究生和博士后的论文将合作进行这项研究。研究结果将在国际会议上发表，并在国际同行评审期刊上发表，并将在LDEO年度开放日上重点介绍。

Intellectual Merit: The subcontinental lithospheric mantle preserves the geochemical imprint left by its tectonic history, including continental crust extraction, replacement by ?juvenile? asthenosphere during orogeny or rifting, metasomatic re-enrichment by subduction- related melts and fluids or mantle plume activity. Modern analytical techniques make it possible to unravel this geochemical evolution through whole rock, mineral, or in-situ trace element and Sr-Nd-Hf-Os-He isotope analyses. The western Ross Sea area is particularly suited for such a study, as it is characterized by a multi-stage tectonic history. Today the Western Ross Sea area is part of the West Antarctic Rift System (WARS), which represents one of Earth?s largest rift systems. The PIs propose to constrain the dynamic and geochemical evolution of the subcontinental lithospheric mantle using modern analytical techniques using samples from multiple locations between the Mt. Erebus Province and Victoria Land available through collaborations with investigators from previous expeditions and the US Polar Rock Repository. The available mantle xenoliths are fresh and range from spinel lherzolites to metasomatized wehrlites and rare websterites, and many carry hydrous phases. Broader impacts: The proposed work will have broad scientific impacts and will initiate national and international collaborations. The project will form the basis of a Ph.D. thesis for a graduate student and a postdoc will collaborate on the study. Results of the study will be presented at international meetings and published in international peer-reviewed journals and will be highlighted at the LDEO annual Open House.