Collaborative Research: The Rosario Segment of the Cretaceous Alisitos Oceanic Arc (Baja California, Mexico): An Outstanding Field Analog to the Izu Bonin Arc

合作研究:白垩纪阿利西托斯大洋弧的罗萨里奥段(墨西哥下加利福尼亚州):与伊豆博宁弧的杰出野外模拟

基本信息

  • 批准号:
    1347794
  • 负责人:
  • 金额:
    $ 19.3万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2014
  • 资助国家:
    美国
  • 起止时间:
    2014-03-01 至 2020-03-31
  • 项目状态:
    已结题

项目摘要

This collaborative research project will interface closely with the IODP projects in the Izu-Bonin-Mariana (IBM) arc by fully characterizing what is probably its best field analog on Earth: the Rosario segment of the Alisitos arc. DeBari has been deeply involved in the IBM proposals, and Busby is co-chief scientist on IODP Expedition 350. Exhumed rocks from arc crustal sections have the unique ability to inform studies of active subduction zones by "ground-truthing" the assumptions that go into models, experiments, and interpretive geophysics and geochemistry. Some of the questions we will ask, highly complementary to the IBM work, are: How is arc middle crust constructed? What is the relationship and proportion between volcanic and plutonic rocks in juvenile arc crust? What is the tempo of constructing arc crust? How does arc crust composition change with time? Is there any older crust that makes up significant parts of the Alisitos arc? What can we learn about convergent margin mineralization by comparing the Alsitos arc to the Izu Bonin arc? How does the crustal structure of the Alisitos arc compare with seismic velocity profiles in modern arcs? Can surface and borehole heat flow measurements in modern arcs be related to features preserved in the geologic record of ancient arcs?This research furthers the careers of two female scientists (DeBari at WWU and Busby at UCSB) and their respective graduate students. Training of these graduate students is collaborative so that both students will become skilled at the integration of field geology, petrology and geochronology. Scientific interaction between US scientists at WWU and UCSB and international colleagues at UNAM in Mexico will broaden the perspectives of all participants, and enhance research and training outcomes. The proposed project is of interest to the broader science community, as it addresses some of the foremost questions in the NSF GeoPRISMS science plan on the growth and evolution of continental crust through study of island arcs (http://www.geoprisms.org/science-plan.html#science-plan), as well as research envisioned by the GeoPRISMS ExTerra initiative (http://www.geoprisms.org/scd/exterra.html). One of the main products, a web-based ?Island Arc Crust Virtual Field Model?, will be used by scientists as a reference model for IBM drilling outcomes, and in curriculum for both undergraduate and graduate students. A field workshop in the Alisitos arc, ideally held in conjunction with Expeditions 350-352 post-expedition meetings and before IBM-4 drilling begins, will provide invaluable context for IBM drilling participants.The Rosario segment of the Cretaceous Alisitos arc in Baja California is an outstanding field analog for the Izu-Bonin-Mariana (IBM) volcanic arc. The IBM arc is under intense study by the International Ocean Drilling Program (IODP) as an in-situ example of present-day formation of nascent continental crust. Earth is the only planet in the solar system with extensive felsic (Si-rich, Mg-poor) continental crust. The rocky planets and the Moon have basaltic (Mg-rich) crusts formed early in the history of the solar system. The volume of continental crust on Earth has grown over time due to plate tectonic processes, dominantly because of accretion of felsic to intermediate volcanic arcs at convergent margins. However, the processes that produce this felsic to intermediate crust are not well characterized in situ. The Rosario segment has superior three-dimensional exposures of an upper- to middle-crustal section through an extensional oceanic arc. Previous mapping of this 60-km-long segment of the Alisitos arc, done in the 1990?s (Busby et al., 2006), will provide a framework for the proposed study; however, that study focused mainly on field descriptions of the volcanic rocks, with limited geochronology, and no geochemistry. The proposed study will determine in detail the relationships between rock types at all stratigraphic levels in the arc, using field, geochemical, and geochronological data. This collaborative research project will interface closely with IODP Expeditions 350-352 (in 2014) and a fourth ambitious proposal to drill to the arc middle crust (IODP Proposal 698 at site IBM-4, awaiting scheduling. These data will be used to construct an ?Island Arc Crust Virtual Field Model? to be used by scientists as a reference model for IBM drilling outcomes.
这一合作研究项目将与Izu-Bonin-Mariana(IBM)弧的IODP项目密切配合,充分描述可能是地球上最好的现场模拟:Alisitos弧的罗萨里奥段。DeBari一直深入参与IBM的提案,而Busby是IODP Expedition 350的联合首席科学家。从弧形地壳剖面中挖出的岩石具有独特的能力,通过“地面实况”模型、实验和解释性地球物理学和地球化学中的假设,为活动俯冲带的研究提供信息。我们要问的一些问题,与IBM的工作高度互补,是:弧中地壳是如何构造的?新生弧壳中火山岩与深成岩的关系和比例如何?弧形地壳的建造克里思是怎样的?弧壳成分如何随时间变化?有没有更古老的地壳构成了阿利西托斯弧的重要部分?通过比较阿尔西托斯弧和伊豆小笠原弧,我们可以了解到会聚边缘成矿作用的哪些方面?阿利西托斯岛弧的地壳结构与现代岛弧的地震速度剖面相比如何?现代弧的地表和钻孔热流测量是否与古弧地质记录中保存的特征有关?这项研究促进了两位女科学家(WWU的DeBari和UCSB的Busby)及其各自研究生的职业生涯。这些研究生的培训是合作,使学生都将成为熟练的野外地质学,岩石学和地质年代学的整合。WWU和UCSB的美国科学家与墨西哥UNAM的国际同事之间的科学互动将拓宽所有参与者的视野,并提高研究和培训成果。拟议的项目引起了广大科学界的兴趣,因为它涉及国家科学基金会GeoPRISMS科学计划中关于通过研究岛弧来研究大陆地壳的生长和演变的一些最重要的问题(http://www.Geoprisms.org/scd/exterra.html),以及GeoPRISMS ExTerra倡议设想的研究(http://www.Geoprisms.org/scd/exterra.html)。 一个主要的产品,一个基于网络的?岛弧地壳虚拟场模型?,将被科学家用作IBM钻井结果的参考模型,并用于本科生和研究生的课程。在Alisitos弧的现场研讨会,理想情况下,与远征350-352考察后会议和IBM-4钻探开始之前举行,将提供宝贵的背景IBM钻探参与者。下加利福尼亚白垩纪Alisitos弧的罗萨里奥段是一个出色的现场模拟伊苏-博宁-马里亚纳(IBM)火山弧。国际大洋钻探计划(IODP)正在对IBM弧进行深入研究,将其作为当今新生大陆地壳形成的现场实例。地球是太阳系中唯一一个拥有广泛的长英质(富硅,贫镁)大陆地壳的行星。岩石行星和月球有玄武岩(富含镁)的地壳形成于太阳系的早期历史。 由于板块构造过程,地球上大陆地壳的体积随着时间的推移而增加,主要是因为在会聚边缘长英质到中间火山弧的增生。然而,产生这种长英质至中间地壳的过程在原地并没有得到很好的表征。罗萨里奥段具有通过伸展洋弧的上地壳至中地壳段的优越的上级三维暴露。以前的地图这60公里长的部分阿利西托斯弧,在1990年完成?s(Busby等人,2006年)将为拟议的研究提供一个框架;然而,该研究主要侧重于对火山岩的实地描述,地质年代学有限,没有地球化学。拟议中的研究将利用野外、地球化学和地质年代学数据,详细确定岛弧所有地层水平上岩石类型之间的关系。这一合作研究项目将与IODP远征350-352(2014年)和第四个雄心勃勃的提议(IODP提议698,在IBM-4站点,等待安排)密切配合。 这些数据将用于构建一个?岛弧地壳虚拟场模型?作为IBM钻探结果的参考模型。

项目成果

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Susan DeBari其他文献

Supporting the Professional Development of Science Teacher Educators Through Shadowing
通过跟班学习支持科学教师教育者的专业发展
  • DOI:
    10.1007/s10763-021-10154-5
  • 发表时间:
    2021-04-07
  • 期刊:
  • 影响因子:
    2.100
  • 作者:
    Deborah Hanuscin;Deborah Donovan;Alejandro Acevedo-Gutiérrez;Emily Borda;Susan DeBari;Josie Melton;Thanh Le;Whitney Morrison;Roxane Ronca
  • 通讯作者:
    Roxane Ronca

Susan DeBari的其他文献

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{{ truncateString('Susan DeBari', 18)}}的其他基金

Upgrade of LA-ICP-MS for research and education at Western Washington University
西华盛顿大学 LA-ICP-MS 升级用于研究和教育
  • 批准号:
    2138789
  • 财政年份:
    2022
  • 资助金额:
    $ 19.3万
  • 项目类别:
    Standard Grant
Collaborative Research: Phenocryst or not? Using a stratovolcano's crystal cargo to explore crustal-scale magmatic systems, Koma Kulshan (Mt. Baker), Northern Cascade Arc
合作研究:斑晶与否?
  • 批准号:
    2147954
  • 财政年份:
    2022
  • 资助金额:
    $ 19.3万
  • 项目类别:
    Standard Grant
COLLABORATIVE RESEARCH: Structural and Petrologic Studies in the TenPeak Pluton and Surrounding Area, North Cascades: A Window into Arc Processes in the Mid to Lower Crust
合作研究:北喀斯喀特 TenPeak 岩体及周边地区的结构和岩石学研究:了解中下地壳弧形过程的窗口
  • 批准号:
    9812621
  • 财政年份:
    1998
  • 资助金额:
    $ 19.3万
  • 项目类别:
    Standard Grant
Intracrustal Magma Evolution in a Jurassic Island Arc: A Case Study of the Wrangellian Crustal Section from Vancouver Island, Canada
侏罗纪岛弧的地壳内岩浆演化:加拿大温哥华岛兰格尔地壳剖面的案例研究
  • 批准号:
    9307519
  • 财政年份:
    1993
  • 资助金额:
    $ 19.3万
  • 项目类别:
    Standard Grant

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