Understanding how tectonic inheritance controls the evolution of mountain belts

了解构造继承如何控制山带的演化

基本信息

  • 批准号:
    RGPIN-2022-05360
  • 负责人:
  • 金额:
    $ 1.89万
  • 依托单位:
  • 依托单位国家:
    加拿大
  • 项目类别:
    Discovery Grants Program - Individual
  • 财政年份:
    2022
  • 资助国家:
    加拿大
  • 起止时间:
    2022-01-01 至 2023-12-31
  • 项目状态:
    已结题

项目摘要

The proposed research will aim to determine the control that tectonic inheritance, defined by pre-existing structures (e.g. faults) and heterogeneity of the Earth's crust, has on mountain building processes and fault reactivation (movement) at the frontal parts of mountain belts (orogens). During mountain building, pre-existing basement structures are critical, relatively weak zones prone to reactivation and provide necessary pathways for the migration of magma, heat, and basement-sourced metals. The research program will focus on the Northern Appalachians (in Canada and the US) where tectonic inheritance has been invoked as having major orogen-scale impacts on mountain building processes; however, evidence showing pre-orogenic fault geometry is speculative and significant reactivation of pre-orogenic faults is largely unrecognized. My recent work in the NL Appalachians demonstrates that tectonic inheritance is significant and that deep-basement rooted faults have been reactivated multiple times during Appalachian Mountain building. I hypothesize that analogous basement structures, generated prior to mountain building and reactivated multiple times, also occur in both Quebec and New England, the southern extension of the Northern Appalachian orogen. The proposed research will test this hypothesis through a multidisciplinary research program requiring detailed geological mapping, stratigraphic and structural analyses, geochronology, and geophysical interpretation. If tectonic inheritance is shown along the Northern Appalachians, traditional models that explain how the Appalachian Mountains were formed will be significantly revised to show that basement-faults are associated with a significant amount of transport and that these faults have a complex history of motion. From an economic perspective, results will allow for the identification of critical geologic structures typically formed during basement fault reactivation, which are often associated with petroleum traps or potential injection sites. Reactivation of basement faults is also directly associated with fluid flow episodes, which are critical to transport metals and heat from deep in the Earth's crust upwards to shallower depths to form sedimentary-hosted mineral systems and provide geothermal energy resources. From a geohazard perspective, these results will allow us to better understand the link between inherited structure and seismic events, which occur in the foreland of orogen's worldwide.
拟议的研究将旨在确定由预先存在的结构(如断层)和地壳的异质性界定的构造继承对造山过程和造山带(造山带)前部断层复活(运动)的控制。在造山过程中,预先存在的基底结构是关键的,相对脆弱的区域容易重新激活,并为岩浆,热量和基底来源的金属的迁移提供必要的途径。该研究计划将集中在北方阿巴拉契亚山脉(在加拿大和美国)的构造继承已被调用作为有重大的造山规模的影响造山过程,然而,证据表明前造山断层几何形状是推测性的,并显着的前造山断层的再活化在很大程度上是不被认可的。我最近在NL阿巴拉契亚山脉的工作表明,构造继承是重要的,深基底根深蒂固的断层在阿巴拉契亚山脉建设期间多次被重新激活。我假设,类似的基底结构,在造山运动和重新激活多次之前产生,也发生在魁北克和新英格兰,北方阿巴拉契亚造山带的南部延伸。拟议的研究将通过一个多学科的研究计划来测试这一假设,该计划需要详细的地质测绘、地层和结构分析、地质年代学和地球物理解释。如果沿着北方阿巴拉契亚山脉显示出沿着的构造继承性,那么解释阿巴拉契亚山脉如何形成的传统模型将被显著修正,以显示基底断层与大量的运输相关,并且这些断层具有复杂的运动历史。从经济的角度来看,结果将允许识别关键的地质结构,通常形成在基底断层复活,这往往是与石油圈闭或潜在的注入点。基底断层的重新活化也与流体流动事件直接相关,这对于将金属和热量从地壳深处向上输送到较浅的深度以形成沉积物承载的矿物系统并提供地热能资源至关重要。从地质灾害的角度来看,这些结果将使我们更好地了解继承性构造和地震事件之间的联系,发生在造山带的前陆世界各地。

项目成果

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White, Shawna其他文献

White, Shawna的其他文献

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{{ truncateString('White, Shawna', 18)}}的其他基金

Understanding how tectonic inheritance controls the evolution of mountain belts
了解构造继承如何控制山带的演化
  • 批准号:
    DGECR-2022-00162
  • 财政年份:
    2022
  • 资助金额:
    $ 1.89万
  • 项目类别:
    Discovery Launch Supplement

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Understanding how tectonic inheritance controls the evolution of mountain belts
了解构造继承如何控制山带的演化
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    Discovery Launch Supplement
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