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

知识优势：除了对埃里伯斯火山层状火山进行了深入研究外，罗斯岛火山中心的现有岩石学和地球化学数据很少，而且已经过时。因此，对罗斯岛碱性岩浆作用的成因、演化及构造背景的认识极为有限。PIs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作用。本研究将提供Nd、Sr、Hf和Pb的最新同位素丰度；熔体包裹体研究确定的喷发前挥发性浓度；对Terror山、bird山和Hut Point半岛样品的岩石学和矿物学资料以及主要和微量元素浓度进行了分析。当这些数据与埃里伯斯火山公布的成分和同位素数据以及罗斯岛公布的Ar-Ar年龄相结合时，这些数据将为地幔源的性质以及罗斯岛岩浆形成的过程和原因提供重要信息。更广泛的影响：该提案将培养两名博士生，扩大代表性不足群体的参与，促进和加强正式课堂环境中的中学教育经验，并鼓励新的研究人员参与USAP。拟议的研究包括与法国里昂的ENS合作。这项研究还将为其他研究人员提供一套描述良好、地球化学特征良好的样品。

Intellectual Merit: Existing petrologic and geochemical data for Ross Island volcanic centers are sparse and outdated, with the exception of the well-studied Mt.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.