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

知识价值：罗斯岛火山中心现有的岩石学和地球化学数据稀少且过时，除了经过充分研究的Mt.埃里伯斯层状火山。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其有限。PIS建议进行现场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：最新的Nd、Sr、Hf和Pb同位素丰度；熔体包裹体研究确定的喷发前挥发分浓度；岩石学和矿物学信息；以及山上样品的常量和微量元素浓度。恐怖，伯德山和哈特角半岛。与埃里伯斯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，这些数据将提供关于地幔来源的性质以及罗斯岛下岩浆成因过程和原因的基本信息。广泛的影响：这项提议将培训两名博士生，扩大未被充分代表的群体的参与，在正式课堂环境中促进和加强中学教育经验，并鼓励新的研究人员参与USAP。这项拟议的研究包括与法国里昂的ENS合作。这项研究还将建立一套描述良好、地球化学特征良好的样本，供其他研究人员使用。

Intellectual Merit: Existing petrologic and geochemical data for Ross Island volcanic centers are sparse and outdated, with the exception of the well-studied Mt.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