Collaborative Research: Deep Structure of the Northeast Tibetan Collision Zone- INDEPTH IV

合作研究:青藏高原东北碰撞带的深层结构-INDEPTH IV

基本信息

  • 批准号:
    0409870
  • 负责人:
  • 金额:
    $ 75.5万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2007
  • 资助国家:
    美国
  • 起止时间:
    2007-02-15 至 2017-01-31
  • 项目状态:
    已结题

项目摘要

This project (INDEPTH IV) is a continuation of previously funded projects (INDEPTH I, II, III). The overarching goal of the INDEPTH studies is to understand the basic processes that take place in a continent-continent collision. INDEPTH I, II, and III were joint Sino-U.S. studies to understand the formation of the Tibetan Plateau and Himalayan mountains, which together comprise Earth's type example of an active continent-continent collision zone. Results from these studies have profoundly influenced prevalent theories of mountain building in such tectonic settings. The focus of INDEPTH IV is the northeastern boundary of the Tibetan Plateau. This boundary plays a central role in a contemporary debate concerning continental plateau formation as an intracontinental response to collisional orogeny. Recent geological studies and limited geophysical measurements in this region have been cited to argue that a) uplift is due to internal imbricate "stacking" of Asian crust while b) Asian continental lithosphere is being detached and "subducted" into the Tibetan mantle. Such models contrast with a competing paradigm, derived primarily from observations in the southern and eastern portions of the Plateau, that attribute plateau formation to ductile flow in the deep crust. Critical to any model of surface tectonics is the mantle dynamics beneath the plateau and adjacent regions. Upper mantle geophysical properties beneath the northern plateau have been variously attributed to delamination triggered by instability of a thickened lithosphere, mantle lid detachment and/or asthenospheric counterflow associated with subduction of Indian continental lithosphere. INDEPTH IV will test key elements in these hypotheses with an integrated, focused program of geophysical surveys across three key segments of the NE Plateau boundary zone. Geophysical surveys will consist of integrated seismic reflection, refraction and densely spaced passive seismic profiles, a detailed magnetotelluric survey, and a regional broadband seismic array. Specific features to be investigated by the surveys include: a) the existence and nature of proposed Moho offsets; b) the deep geometry of major thrust faults at the plateau boundary; c) the relationship between major thrusts and strike slip faults; d) constraints on lower crustal flow from structural continuity of crustal markers; e) the existence and nature of subducting Asian lithosphere; and f) the mode of lithospheric thickening beneath the plateau foreland.
这个项目(第四次调查)是以前资助的项目(第一、二、三次调查)的继续。纵深研究的首要目标是了解大陆与大陆碰撞时发生的基本过程。深度一、二、三是中美联合项目。这些研究结果深刻地影响了这种构造背景下流行的造山理论。这一边界在当代关于大陆高原形成是对碰撞造山运动的陆内反应的争论中起着中心作用。这种模式与一种竞争性的模式形成对比,这种模式主要来自高原南部和东部的观测,将高原的形成归因于地壳深处的韧性流动。任何地表构造模型的关键是高原及其邻近地区的地幔动力学。北部高原下的上地幔地球物理性质不同地归因于由增厚岩石圈不稳定引发的剥离、地幔盖剥离和/或与印度大陆岩石圈俯冲相关的软流圈逆流。INDEPTH IV将通过在东北高原边界带的三个关键部分进行综合的、集中的地球物理调查计划来测试这些假设中的关键要素。地球物理调查将包括综合地震反射、折射和密集间隔的被动地震剖面、详细的大地电磁调查和区域宽带地震阵列。调查要调查的具体特征包括:a)拟议的莫霍偏移的存在和性质;B)高原边界主要逆冲断层的深部几何构造;C)逆冲断层与走滑断层的关系;D)构造连续性对下地壳流动的约束;e)俯冲亚洲岩石圈的存在和性质;f)高原前陆下岩石圈增厚模式。

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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James Ni其他文献

Mantle deformation in the highly oblique indo-burma subduction system inferred from shear wave splitting measurements
  • DOI:
    10.1016/j.epsl.2024.118895
  • 发表时间:
    2024-10-01
  • 期刊:
  • 影响因子:
  • 作者:
    Md Mohimanul Islam;Shengji Wei;Patricia Persaud;Michael S. Steckler;Frederik Tilmann;James Ni;James Gaherty;Kyaw Moe Oo;Oo Than;Yin Myo Min Htwe;Eric Sandvol
  • 通讯作者:
    Eric Sandvol
3D imaging of subducting and fragmenting Indian continental lithosphere beneath southern and central Tibet using body-wave finite-frequency tomography
  • DOI:
    http://dx.doi.org/10.1016/j.epsl.2016.03.029
  • 发表时间:
    2016
  • 期刊:
  • 影响因子:
  • 作者:
    Xiaofeng Liang;Yun Chen;Xiaobo Tian;Yongshun John Chen;James Ni;Andrea Gallegos;Simon L. Klemperer;Minliang Wang;Tao Xu;Changqing Sun;Shaokun Si;Haiqiang Lan;Jiwen Teng
  • 通讯作者:
    Jiwen Teng

James Ni的其他文献

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{{ truncateString('James Ni', 18)}}的其他基金

Collaborative Research: The Burma Arc from Collision Kinematics to Subduction Tectonics as Observed from a Passive seismic experiment (BACKSTOP)
合作研究:被动地震实验观察到的从碰撞运动学到俯冲构造的缅甸弧(BACKSTOP)
  • 批准号:
    1928786
  • 财政年份:
    2019
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Continuing Grant
Collaborative Research: NorthEast China Extended seiSmic Array (NECESS Array): Deep Subduction, Mantle Dynamics, and Lithospheric Evolution beneath Northeast China
合作研究:中国东北扩展地震台阵(NECESS Array):中国东北地区深俯冲、地幔动力学和岩石圈演化
  • 批准号:
    0634903
  • 财政年份:
    2007
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Mapping the Rivera Subduction Zone
合作研究:绘制里维拉俯冲带地图
  • 批准号:
    0335802
  • 财政年份:
    2004
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Colorado Plateau/Rio Grande Rift/Great Plains Seismic Transect
合作研究:科罗拉多高原/里奥格兰德裂谷/大平原地震断面
  • 批准号:
    9706094
  • 财政年份:
    1999
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Continuing Grant
Collaborative Research: Structure of the Crust and Upper Mantle Beneath the Tibetan Plateau Interior (INDEPTH III)
合作研究:青藏高原内部地壳和上地幔的结构(INDEPTH III)
  • 批准号:
    9614616
  • 财政年份:
    1997
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Continuing Grant
Upgrade of the Computational Facilities in the Solid Earth Geophysics Program at New Mexico State University
新墨西哥州立大学固体地球物理项目计算设施升级
  • 批准号:
    9526730
  • 财政年份:
    1996
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Standard Grant
Mapping Azimuthal Anisotropy in the United States from LRSM Data
根据 LRSM 数据绘制美国的方位各向异性图
  • 批准号:
    9506607
  • 财政年份:
    1995
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Standard Grant
Auxiliary Experiment for INDEPTH-II - Uppermantle Velocity Anomaly, Shear-Wave Splitting, and Crustal/Mantle Velocity Structures in the Tethyan Himalayas and Southern Tibet
INDEPTH-II 辅助实验 - 特提斯喜马拉雅山和西藏南部的上地幔速度异常、剪切波分裂和地壳/地幔速度结构
  • 批准号:
    9316814
  • 财政年份:
    1994
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Standard Grant
Geological and Seismic Study of the Pakistan Himalayas, Visit of Two Pakistani Scientists for Collaborative Researchat New Mexico State University and Oregon State University
巴基斯坦喜马拉雅山地质与地震研究,两位巴基斯坦科学家来访新墨西哥州立大学和俄勒冈州立大学进行合作研究
  • 批准号:
    9310376
  • 财政年份:
    1993
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Standard Grant
Upgrading of Geophysics Computer System
地球物理计算机系统升级改造
  • 批准号:
    9018531
  • 财政年份:
    1990
  • 资助金额:
    $ 75.5万
  • 项目类别:
    Standard Grant

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