Collaborative Research: Geochemical Transect from Oceanic Adare Basin to Adjacent Continental Adare Peninsula: Implications for the Origin of Intraplate (HIMU-like) Alkaline Magmas

合作研究：从大洋阿代尔盆地到邻近的大陆阿代尔半岛的地球化学横断面：对板内（类 HIMU）碱性岩浆起源的影响

• 批准号: 0943503
• 负责人: Paterno Castillo
• 金额: $ 19.98万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 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: 2010-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0943503&HistoricalAwards=false
• 关键词: Collaborative; Research; Geochemical; Transect; Oceanic

Intellectual Merit: This proposal is for a combined geochronologic, petrographic, geochemical, and Sr-Nd-Pb-Os-O isotopic investigation of existing lava samples from the seamounts in the Adare Basin and from the adjacent continental Hallett Volcanic Province in Northern Victoria Land. A comparative study of contemporaneous intraplate oceanic and continental alkaline volcanism will be used to evaluate sources and processes responsible for magma production and differentiation. The seamount lavas will provide an opportunity to better characterize the composition of their underlying mantle source whereas the continental lavas will provide information on any effects of contamination by continental crust on their source signatures. The cause of Cenozoic magmatism in West Antarctica has been explained by a variety of models based primarily on geochemical evidence from continental volcanism. The proposed investigation will for the first time provide detailed geochronologic and geochemical data for both continental lavas and adjacent oceanic seamount lavas, thus offering a means by which to critically assess whether Cenozoic alkaline volcanism is due to plume or plume-related activities or magmatism unrelated to mantle plumes. The classic element of this controversy is whether the geochemistry of the magmas represents melting of mantle asthenosphere or subcontinental lithosphere and whether there is a degree of contamination as they rise through relatively thick and chemically heterogeneous continental crust. Broader impacts: This project will support a PhD and MSc student. Undergraduate students will also be involved in sample preparation, analytical work and interpretation via honors/senior theses. A post-doctoral associate will be involved in the oxygen isotopic analysis of the samples. The students will be involved in a multi-institutional and international collaboration. The geochemical database generated will be made available to other researchers in the region and the results will be published in peer-reviewed journals.

智力优点：该提案是针对从Adare盆地和北部北部Vict Vict Vict vict vict的北部哈雷特省的邻近的海洋山庄中对现有熔岩样品进行现有熔岩样品的组合岩体和SR-ND-PB-OS-O同位素研究。同时板内海洋和大陆碱性火山的比较研究将用于评估负责岩浆生产和分化的来源和过程。海山熔岩将提供一个机会，以更好地表征其基本地幔来源的组成，而大陆熔岩将提供有关大陆壳污染对其来源签名的任何影响的信息。南极西部的浮游生物岩浆作用的原因已由多种模型主要基于大陆火山主义的地球化学证据。拟议的调查将首次为大陆熔岩和相邻的海洋海洋熔岩提供详细的地质学和地球化学数据，从而提供一种批判性评估的手段，以评估新生代碱性火山主义是由于羽毛或羽毛相关的活性还是与与羽毛相关的活动或磁质症无关地幔羽。这一争议的经典元素是，岩浆的地球化学是否代表地幔运动层或次大岩石圈的融化，以及当它们通过相对较厚且化学上异质性的大陆地壳上升时是否存在一定程度的污染。更广泛的影响：该项目将支持博士学位和MSC学生。本科生还将通过荣誉/高级论文参与样本准备，分析工作和解释。博后助理将参与样品的氧同位素分析。学生将参与多机构和国际合作。生成的地球化学数据库将提供给该地区的其他研究人员，结果将在同行评审的期刊上发布。