Collaborative Research: A Geochemical Study of the Nature and Evolution of Mantle Upwelling Beneath Ross Island and its Relationship to Tectonics in the West Antarctica Rift System

智力优势：罗斯岛火山中心现有的岩石学和地球化学数据是稀疏和过时的，除了经过充分研究的山。埃里伯斯成层火山。因此，对罗斯岛碱性岩浆作用的成因、演化和构造背景的认识极为有限。PI建议进行实地和实验室的地球化学，同位素和岩石学研究，以调查整个罗斯岛的碱性火山活动。这项研究将提供：国家的最先进的Nd，Sr，Hf和Pb同位素丰度;喷发前的挥发性浓度，在熔融包裹体研究确定;岩石学和矿物学信息，以及主要和微量元素浓度的样品从山。恐怖，鸟山和小屋点半岛。当结合已发表的埃里伯斯山的成分和同位素数据以及已发表的罗斯岛的Ar-Ar年龄数据时，这些数据将提供有关罗斯岛下地幔源的性质以及岩浆成因的过程和原因的重要信息。该提案将培养两名博士生，扩大代表性不足群体的参与，促进和加强中学教育经验在一个正式的教室设置，并鼓励新的调查人员成为参与USAP。拟议的研究包括与法国里昂ENS的合作。这项研究还将建立一套良好的描述和地球化学特征良好的样品提供给其他研究人员。

Intellectual Merit: Existing petrologic and geochemical data for Ross Island volcanic centers are sparse and outdated, with the exception of the well-studied Mt. Erebus stratovolcano. Therefore, understanding of the genesis, evolution and tectonic context of alkaline magmatism on Ross Island is extremely limited. The PIs propose to conduct a field and laboratory based geochemical, isotopic, and petrologic study to investigate alkaline volcanism across the entirety of Ross Island. This study will provide: state-of-the-art isotopic abundances of Nd, Sr, Hf and Pb; pre-eruptive volatile concentrations as determined in melt inclusion studies; petrological and mineralogical information, and major and trace element concentrations for samples from Mt. Terror, Mt.Bird and Hut Point Peninsula. When combined with the published compositional and isotopic data from Mount Erebus, and the published Ar-Ar ages from Ross Island, these data will provide essential information on the nature of the mantle source and the processes and causes of magma genesis beneath Ross Island.Broader impacts: This proposal will train two PhD students, broaden the participation of underrepresented groups, promote and enhance secondary educational experiences in a formal class room setting, and encourage new investigators to become involved in USAP. The proposed research includes a collaboration with ENS, Lyon, France. This study will also establish a suite of well-described and geochemically well-characterized samples available to other researchers.