Collaborative Research: Lithospheric removal: The Sierra Nevada as the prototype of a fundamental process in mountain building

合作研究:岩石圈去除:内华达山脉作为造山基本过程的原型

基本信息

项目摘要

0607458ClarkThe delamination of mantle lithosphere from continental crust is a fundamental tectonic process that is difficult to study. The goal of this project is to examine the removal of mantle lithosphere from under the Sierra Nevada. The PIs assert that the Sierras are an excellent place to look because delamination appears to have happened rather recently, and may still be happening. Preliminary studies indicate possible mantle "drips" at both ends of the Sierra. The proposal(s) seeks to identify the removal process and the fate of the delaminated portion ..., i.e. the drips. Through combined magnetotelluric (MT), geochemistry, geomorphic studies and geodynamic modeling, integrated with existing and proposed passive seismic data, the PIs seek to gain understanding of how mantle lithosphere is removed, and the conditions that facilitate such removal. The hope is that this understanding can be applied elsewhere. Removal of mantle lithosphere may have played a key role in regions with histories and structures as diverse as the southern Sierra Nevada, the Alboran Sea, the Tibetan Plateau, the Apennines, the Appalachians, central Andes, the Carpathians, Precambrian South Africa, the North China Craton, and the Basin and Range. However, in many of these other regions where mantle lithosphere may have been removed, the removal is either too old or in an environment too complex, or logistically too difficult to expect a record as clear as in the Sierra. The proposed project will build on the results of two previously funded CD projects, the Southern Sierra Continental Dynamics Project (that found that the southern part of the range was supported not by thick crust, but by a hot, low-density upper mantle) and the Sierran Paradox Experiment (that discovered that eclogite had been removed from the base of the crust in the latest Miocene or Pliocene time).A strength of the project is the PI's intent to conduct a joint analysis of MT and seismic data. As stated, this joint analysis will use a more quantitative coupling of MT and seismic results based on the underlying physical properties which produce the observables (e.g. petrophysical behavior of mantle olivine and pyroxene based rocks with and without water). The PIs seek to tie seismic velocities and electrical resistivity via poisson's ratio, attenuation, and anisotropy. Such a joint inversion method, particularly if it can provide some measure of mantle hydration, would advance the ability to geophysically image the mantle lithosphere. This project is paired with a project that has been funded by EarthScope (Sierra Nevada EarthScope Project - SNEP) to conduct a seismological investigation with the FlexAray component of EarthScope in the central Sierra Nevada. The PIs of SNEP are G. Zandt, T. Owens, and C. Jones. Currently focused on the northern edge of the region where lithosphere is known to have been removed, the seismological work will place limits on the extent of lithosphere removal and delineate the seismological structures resulting from that removal. This CD project explores the variations in geological and other geophysical observations across the same region with the goal of identifying those features clearly associated with removal of the lithosphere. Although each of these studies will yield useful results without the other, the combination of them should exceed the sum of the separate parts.
地幔岩石圈与大陆地壳的拆沉作用是一个基本的构造过程,也是一个难以研究的问题。 这个项目的目标是研究从内华达州下地幔岩石圈的移动。 PI断言,塞拉山脉是一个绝佳的观察地点,因为分层似乎是最近发生的,而且可能仍在发生。 初步研究表明,在塞拉利昂的两端可能有地幔“滴”。 该提案旨在确定拆除过程和分层部分的命运.,即滴液。 通过结合大地电磁(MT),地球化学,地貌研究和地球动力学建模,与现有的和拟议的被动地震数据相结合,PI寻求了解地幔岩石圈是如何被移除的,以及促进这种移除的条件。 希望这种理解可以适用于其他地方。 地幔岩石圈的移动可能在历史和结构多样的地区发挥了关键作用,这些地区包括南部的内华达州、阿尔沃兰海、青藏高原、亚平宁山脉、阿巴拉契亚山脉、中部的安第斯山脉、喀尔巴阡山脉、前寒武纪的南非、中国北部的东昆仑山脉以及盆地和山脉。 然而,在许多其他地区,地幔岩石圈可能已经被移除,移除要么太老,要么环境太复杂,要么逻辑上太难期望像Sierra一样清晰的记录。 拟议的项目将建立在两个先前资助的CD项目的成果基础上,(发现山脉的南部不是由厚地壳支撑的,而是由热的,低密度上地幔)和Sierran Partial实验(发现榴辉岩在中新世或上新世晚期从地壳底部被移走)该项目的一个优势是PI打算对MT和地震数据进行联合分析。 如前所述,该联合分析将根据产生可观测值的基本物理性质(例如,地幔橄榄石和辉石基岩石在有水和无水情况下的岩石物理行为),对MT和地震结果进行更定量的耦合。 PI试图通过泊松比、衰减和各向异性来联系地震速度和电阻率。 这种联合反演方法,特别是如果它可以提供一些地幔水化的措施,将提高能力,地幔岩石圈的成像。 该项目与EarthScope资助的一个项目(Sierra内华达州EarthScope项目- SNEP)相结合,利用EarthScope的FlexAray组件在Sierra内华达州中部进行地震调查。 SNEP的PI为G. Zandt,T. Owens和C.琼斯 地震学工作目前集中在已知岩石圈已被移走的区域的北方边缘,将对岩石圈移走的范围加以限制,并描绘出移走所造成的地震学结构。 这个CD项目探索了同一地区地质和其他地球物理观测的变化,目的是确定那些与岩石圈移动明显相关的特征。 虽然这些研究中的每一项都将产生有用的结果,但它们的组合应该超过单独部分的总和。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
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Marin Clark其他文献

The influence of seismic displacement models on spatial prediction of regional earthquake-induced landslides
地震位移模型对区域震源滑坡空间预测的影响
  • DOI:
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    7.4
  • 作者:
    Weibing Gong;Dimitrios Zekkos;Marin Clark
  • 通讯作者:
    Marin Clark
The 2021 Melamchi Flood: A massive erosional cascade in the Himalayan Mountains of central Nepal
2021 年梅拉姆奇洪水:尼泊尔中部喜马拉雅山脉的大规模侵蚀级联
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Chan;Marin Clark;D. Chamlagain;Sujata Bista;Anuj Siwakoti;A. J. West
  • 通讯作者:
    A. J. West

Marin Clark的其他文献

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{{ truncateString('Marin Clark', 18)}}的其他基金

RAPID: Land surface hazards under accelerating climate change: Example from 2023 Hurricane Hilary
RAPID:气候变化加速导致的地表灾害:以 2023 年希拉里飓风为例
  • 批准号:
    2344994
  • 财政年份:
    2023
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Standard Grant
Track 1 - Center Catalyst: Center for Land Surface Hazards (CLaSH)
轨道 1 - 中心催化剂:地表灾害中心 (CLaSH)
  • 批准号:
    2224871
  • 财政年份:
    2022
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Standard Grant
NSFGEO-NERC Collaborative Research: Coupling Erosion, Weathering, and Hydrologic Function in an Active Orogenic System
NSFGEO-NERC 合作研究:活跃造山系统中侵蚀、风化和水文功能的耦合
  • 批准号:
    2020970
  • 财政年份:
    2020
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Continuing Grant
Collaborative Research: Landslides related to the 2015 Mw7.8 Gorkha earthquake, from ground motion and hazard to geomorphic response
合作研究:与 2015 年 Mw7.8 廓尔喀地震相关的山体滑坡,从地面运动和灾害到地貌响应
  • 批准号:
    1640797
  • 财政年份:
    2016
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Standard Grant
RAPID: Collaborative Research: Topographic Change and Cascading Hazards Following the Mw7.8 Kaikoura (New Zealand) Earthquake
RAPID:协作研究:Mw7.8 凯库拉(新西兰)地震后的地形变化和级联灾害
  • 批准号:
    1719496
  • 财政年份:
    2016
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Standard Grant
RAPID Collaborative Research: Landslides caused by the April 2015 Nepal earthquakes, from immediate hazard to tectonic driver
RAPID 合作研究:2015 年 4 月尼泊尔地震引起的山体滑坡,从直接危害到构造驱动因素
  • 批准号:
    1546631
  • 财政年份:
    2015
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Standard Grant
Determining hillslope-scale material strength from seismically-triggered landslide events
从地震引发的滑坡事件中确定山坡尺度的材料强度
  • 批准号:
    1528576
  • 财政年份:
    2015
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Standard Grant
Collaborative Research: Growth of the Tibetan Plateau and Eastern Asia Climate: Clues to Understanding the Hydrological Cycle
合作研究:青藏高原的增长和东亚气候:了解水文循环的线索
  • 批准号:
    1211434
  • 财政年份:
    2012
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Standard Grant
Collaborative Research: Growth of the Tibetan Plateau and Eastern Asia Climate: Clues to Understanding the Hydrological Cycle
合作研究:青藏高原的增长和东亚气候:了解水文循环的线索
  • 批准号:
    0908711
  • 财政年份:
    2009
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Continuing Grant
Collaborative Research: Upward and Outward: Growth of the Tibetan Plateau and Climatic Consequences
合作研究:向上和向外:青藏高原的增长和气候后果
  • 批准号:
    0549748
  • 财政年份:
    2005
  • 资助金额:
    $ 11.18万
  • 项目类别:
    Continuing Grant

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合作研究:美国西部岩石圈变形的垂直特征
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    2045291
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