MARGINS: Collaborative Research: A 21st Century Reconnaissance of Aleutian Arc Inception

边缘:合作研究:21 世纪阿留申岛弧起始点勘察

基本信息

  • 批准号:
    1144494
  • 负责人:
  • 金额:
    $ 19.78万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2012
  • 资助国家:
    美国
  • 起止时间:
    2012-04-01 至 2015-03-31
  • 项目状态:
    已结题

项目摘要

The Alaska/Aleutian Arc is the most geologically active region in North America with abundant large earthquakes and eruptions from more than 50 active volcanoes. Determining precisely how and when the Aleutian Arc began to form is one of the key elements for understanding the origin of the Bering Sea-Alaska-North Pacific region as well as how several circum-Pacific volcanic zones are related to one another. Our understanding of how volcanism initiated in the Aleutian Arc is clouded due in large part to the scarcity of data that bear on the ages of the earliest volcanic rocks in the Aleutian Islands. The proposed reconnaissance investigation of Aleutian Arc inception involves sampling and determining the ages of the oldest records of volcanism. The aim is to define when Aleutian arc volcanism started and highlight potential linkages with the initiation of volcanism elsewhere in the Pacific and the rapid change in the relative motions of oceanic plates that occurred 52 million years ago. In addition, the proposed research will generate basic information regarding how and why the Aleutian arc poses significant volcanic and earthquake hazards to the population in Alaska and around the Pacific Rim.The proposed research will employ state-of-the-art 40Ar/39Ar and U-Pb geochronology, along with geochemical, and isotopic analysis of the dated rocks. The focus is on subaerial outcrops on Amatignak, Ulak, and Kiska islands, which hold the greatest potential for exploration into the early history of the Aleutians. New geochronologic and geochemical data will precisely constrain when the Aleutian arc inception began, what the compositions of the eruptive products were, and how they evolved through the earliest history of the arc. This information will also be used to evaluate the existing tectonic models of Aleutian arc inception and Pacific Plate motion during the middle Eocene. This project will forge a new collaboration between scientists at UW-Madison, Cornell University, and the University of Alaska-Fairbanks/USGS that may benefit the GeoPRISMS program for its duration. Our findings will be used immediately to determine where future efforts to examine the Aleutian Arc and its fore-arc structures via submersible ROVs, dredging, and geophysical imaging should concentrate to best address questions of subduction zone initiation.
阿拉斯加/阿留申弧是北美地质活动最活跃的地区,大地震频发,50多座活火山喷发。精确地确定阿留申弧是如何以及何时开始形成的,是了解白令海-阿拉斯加-北太平洋地区起源的关键因素之一,也是了解几个环太平洋火山带如何相互联系的关键因素之一。我们对阿留申岛弧的火山活动是如何开始的理解是模糊的,这在很大程度上是由于缺乏有关阿留申群岛最早火山岩年龄的数据。拟议的阿留申弧初始侦察调查包括取样和确定最古老的火山活动记录的年龄。其目的是确定阿留申弧火山活动何时开始,并强调与太平洋其他地方火山活动开始的潜在联系,以及5200万年前发生的海洋板块相对运动的快速变化。此外,拟议的研究将产生关于阿留申弧如何以及为什么对阿拉斯加和环太平洋地区的人口构成重大火山和地震危险的基本信息。拟议的研究将采用最先进的40Ar/39Ar和U-Pb地质年代学,以及地球化学和同位素分析的年代岩石。重点是阿马提尼亚克岛、乌拉克岛和基斯卡岛上的地面裸露物,这些地方最有可能探索阿留申群岛的早期历史。新的地质年代学和地球化学数据将精确地限制阿留申弧何时开始,喷发产物的成分是什么,以及它们在弧的早期历史中是如何演变的。这些信息也将用于评估中始新世阿留申弧起始和太平洋板块运动的现有构造模型。这个项目将在威斯康星大学麦迪逊分校、康奈尔大学和阿拉斯加费尔班克斯大学/美国地质勘探局的科学家之间建立一个新的合作关系,这可能会使地质系统项目在其持续期间受益。我们的发现将立即用于确定未来通过潜水rov、疏浚和地球物理成像来检查阿留申弧及其弧前结构的工作,以最好地解决俯冲带起始的问题。

项目成果

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Brian Jicha其他文献

<sup>40</sup>Ar/<sup>39</sup>Ar age and petrology of magmatic rocks from East Balkan (Bulgaria) constrain the initiation of regional subduction in SE Europe
  • DOI:
    10.1016/j.lithos.2021.106302
  • 发表时间:
    2021-10-01
  • 期刊:
  • 影响因子:
  • 作者:
    Svetoslav Georgiev;Peter Marchev;Brian Jicha;Banush Banushev;Raya Raicheva;Irena Peytcheva;Albrecht von Quadt
  • 通讯作者:
    Albrecht von Quadt
Shift from arc to within-plate magmatism at 635 Ma as recorded by Neoproterozoic dikes, southern Midyan terrane, NW Arabian Shield
阿拉伯地盾西北部 Midyan 地体南部的新元古代岩脉记录了 635 Ma 从弧形岩浆活动到板内岩浆活动的转变
  • DOI:
  • 发表时间:
    2024
  • 期刊:
  • 影响因子:
    3.8
  • 作者:
    Scott A. Whattam;Robert J. Stern;Hossein Azizi;Keewook Yi;Haitham M. Baggazi;Abdullah Alquabalee;Fatemeh Nouri;Brian Jicha;Yanick Brice Lemdjou;A. El Fakharani
  • 通讯作者:
    A. El Fakharani
The large Rupelian Rhodope Massif eruptions as the source of airfall tuffs in SE, S and Central Europe: 40Ar/39Ar and U–Pb age constraints
  • DOI:
    10.1007/s00531-024-02457-z
  • 发表时间:
    2024-09-09
  • 期刊:
  • 影响因子:
    2.000
  • 作者:
    Peter Marchev;Raya Raicheva;Brian Jicha;Marcel Guillong;Rositsa Ivanova;Olivier Bachmann;Richard Spikings;Aral Okay;Péter Ozsvárt
  • 通讯作者:
    Péter Ozsvárt
A Bayesian age from dispersed plagioclase and zircon dates in the Los Chocoyos ash, Central America
  • DOI:
    10.1016/j.epsl.2024.118826
  • 发表时间:
    2024-10-01
  • 期刊:
  • 影响因子:
  • 作者:
    Alec Baudry;Brad S. Singer;Brian Jicha;Christine E. Jilly-Rehak;Jorge A. Vazquez;C. Brenhin Keller
  • 通讯作者:
    C. Brenhin Keller
Fault and basin depocentre migration over the last 2 Ma in the L'Aquila 2009 earthquake region, central Italian Apennines
  • DOI:
    10.1016/j.quascirev.2012.08.016
  • 发表时间:
    2012-11-21
  • 期刊:
  • 影响因子:
  • 作者:
    Biagio Giaccio;Paolo Galli;Paolo Messina;Edoardo Peronace;Giancarlo Scardia;Gianluca Sottili;Andrea Sposato;Edi Chiarini;Brian Jicha;Stefania Silvestri
  • 通讯作者:
    Stefania Silvestri

Brian Jicha的其他文献

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{{ truncateString('Brian Jicha', 18)}}的其他基金

Collaborative Research: Early Evolution of the Hawaiian Plume from the Geochemistry and Geochronology of Basalts Spanning the Entire Emperor Seamount Chain
合作研究:横跨整个皇帝海山链的玄武岩地球化学和地质年代学夏威夷羽流的早期演化
  • 批准号:
    2135694
  • 财政年份:
    2022
  • 资助金额:
    $ 19.78万
  • 项目类别:
    Standard Grant
Collaborative Research: Beyond the big ones: Petrochronologic investigation of Quaternary small-volume volcanism in the Black Rock Desert, Utah
合作研究:超越大火山:犹他州黑岩沙漠第四纪小体积火山活动的岩石年代学研究
  • 批准号:
    1940266
  • 财政年份:
    2020
  • 资助金额:
    $ 19.78万
  • 项目类别:
    Standard Grant
Collaborative Research: Investigating Initiation and History of the Aleutian Arc and Composition and Significance of North Pacific Seafloor via Dredge Samples from the R/V Sonne
合作研究:通过 R/V Sonne 的挖泥船样本调查阿留申岛弧的起源和历史以及北太平洋海底的组成和意义
  • 批准号:
    1753492
  • 财政年份:
    2018
  • 资助金额:
    $ 19.78万
  • 项目类别:
    Standard Grant
Collaborative research: Taking the pulse of the Northwest Hawaiian Ridge: Implications for Flux Variations and mid-Cenozoic Pacific Plate Motions
合作研究:把握西北夏威夷海脊的脉搏:对通量变化和中新生代太平洋板块运动的影响
  • 批准号:
    1834723
  • 财政年份:
    2018
  • 资助金额:
    $ 19.78万
  • 项目类别:
    Standard Grant
Collaborative Research: Building an International Partnership for GeoPRISMS Research in the Aleutian-Primary Site through US Participation in Cruises of the German R/V Sonne
合作研究:通过美国参与德国 R/V Sonne 号的巡航,为阿留申群岛主遗址的 GeoPRISMS 研究建立国际合作伙伴关系
  • 批准号:
    1551657
  • 财政年份:
    2016
  • 资助金额:
    $ 19.78万
  • 项目类别:
    Standard Grant
Collaborative Research: Paleogeographic Record of Contractional to Extensional Tectonics in the Cordilleran Hinterland, Nevada
合作研究:内华达州科迪勒拉腹地收缩到伸展构造的古地理记录
  • 批准号:
    1321939
  • 财政年份:
    2013
  • 资助金额:
    $ 19.78万
  • 项目类别:
    Standard Grant

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