Tectonic Overpressures in High-Strain Zones: A Quantitative Investigation

高应变区的构造超压:定量研究

基本信息

  • 批准号:
    0003315
  • 负责人:
  • 金额:
    $ 6.71万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2001
  • 资助国家:
    美国
  • 起止时间:
    2001-01-01 至 2003-12-31
  • 项目状态:
    已结题

项目摘要

0003315JiangTectonic overpressure is an old, fundamental but still controversial problem in geology. Recent work clearly demonstrates that, in non-Andersonian stress regimes, the magnitude of tectonic overpressures is not limited by the rock strength. Ductile high-strain zones are non-Andersonian stress domains. Little is known of overpressures in such important tectonic environments. This investigation uses numerical and analytical modeling techniques to address two questions: (1) Can high overpressures be generated in high-strain zones, given realistic rheology and natural deformation conditions? (2) Can high overpressures,if generated, be dynamically maintained for significant geological times to affect metamorphic reactions? Regardless of whether the answers are positive or negative, the research results will have significant scientific merit. A negative answer to either question would place the now widely-practiced pressure-depth conversion on a rigorous basis. A positive answer to both questions implies that the pressure data from high-strain zone rocks cannot be converted to depths without qualification. Current tectonic interpretation of geothermobarometric data needs to be reconsidered. Since many high-pressure and ultrahigh-pressure rocks show evidence of a high-strain zone origin, a significant overpressure would imply that these rocks may have formed at depths considerably shallower than currently believed. A higher-than-lithostatic pressure gradient as a result of overpressure buildup is a possible driving force to be considered for fluid flow, melt extraction and migration, and pluton emplacement.
0003315构造超压是地质学中一个古老而又基本但仍有争议的问题。 最近的工作清楚地表明,在非安德森应力制度,构造超压的大小不受岩石强度。 韧性高应变区是非安德森应力域。在如此重要的构造环境中,人们对超压知之甚少。 本研究使用数值和分析模拟技术来解决两个问题:(1)高超压是否可以在高应变区产生,给定现实的流变和自然变形条件? (2)高超压,如果产生,能动态地保持重要的地质时代,影响变质反应? 无论答案是肯定的还是否定的,研究结果都将具有重大的科学价值。 对这两个问题的否定回答将使现在广泛实行的压力-深度转换处于严格的基础上。 对这两个问题的肯定回答意味着,来自高应变区岩石的压力数据不能在没有资格的情况下转换为深度。 目前对地质温压数据的构造解释需要重新考虑。 由于许多高压和超高压岩石显示出高应变带起源的证据,显著的超压意味着这些岩石可能形成于比目前认为的要浅得多的深度。 由于超压的累积而产生的高于岩石静力学的压力梯度可能是流体流动、熔体提取和迁移以及岩体侵位的驱动力。

项目成果

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Dazhi Jiang其他文献

Dynamic patterns of open review process
公开审查过程的动态模式
Treatment of stage IIIA-N2 EGFR-mutant non-small cell lung adenocarcinoma.
IIIA-N2 期 EGFR 突变非小细胞肺腺癌的治疗。
  • DOI:
    10.21037/jtd.2018.12.106
  • 发表时间:
    2019
  • 期刊:
  • 影响因子:
    2.5
  • 作者:
    Jinlong Zhao;Dazhi Jiang;Jiahui Du;Peng Yang
  • 通讯作者:
    Peng Yang
Comment on “Pressure-to-Depth Conversion Models for Metamorphic Rocks: Derivation and Applications”
Mesozoic contractional deformation in central East Asia: Constraints from deformation and sedimentary record of the Helanshan fold and thrust belt, North China Craton
  • DOI:
    https://doi.org/10.1016/j.gr.2022.03.011
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    6.1
  • 作者:
    Wei Li;Dazhi Jiang;Yunpeng Dong;Zhouxu Zheng;Jinxiang Zhao;Wenbin Kang;Le Zhang
  • 通讯作者:
    Le Zhang
Evolutionary Algorithm for Identifying Discontinuous Parameters of Inverse Problems
识别反问题不连续参数的进化算法

Dazhi Jiang的其他文献

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与墨西哥深水湾异地盐层变形和溶解相关的超压、流体运移、传质和成岩作用的产生。
  • 批准号:
    9805459
  • 财政年份:
    1999
  • 资助金额:
    $ 6.71万
  • 项目类别:
    Continuing Grant
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