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Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
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深层大陆的根和坑

D Graham Pearson1, James M Scott2, Jingao Liu3

  • 1Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada. gdpearso@ualberta.ca.

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概括

克拉顿是地球的古老大陆核心,由厚厚的地幔根形成,通过低压融化和随后的深层运输. 这些稳定的岩层根形成的关键在于地质变厚过程,使得大陆的出现成为可能.

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科学领域:

  • 地质学
  • 地质学
  • 构造学

背景情况:

  • 对于理解地球历史至关重要.
  • 它们的形成和保存,特别是它们的地幔根,仍然是一个重大的地质挑战.
  • 中古时代和古原生态时代对于组装长寿石坑至关重要.

研究的目的:

  • 调查岩层根的形成和演变.
  • 了解对 Kratons 的长期稳定负责的过程.
  • 改进克拉顿的定义,包括中原生态时期的稳定地区域.

主要方法:

  • 对矿化残留物的分析.
  • 通过横向积累和压缩对石灰岩厚度的建模.
  • 在特定的前坎布里亚时代的地质重建.

主要成果:

  • 岩石层的根源来自于被运往更深处的低压融化残留物.
  • 在中古和古原生态时期形成的厚厚,稳定的地幔根 (150-250公里) 对于 Kraton 的保存至关重要.
  • 有可能在多个循环中发生的岩层变厚是产生广泛,强大的岩层层的基础.

结论:

  • 厚厚的岩层根的发展与形形成和长寿密切相关.
  • 克拉顿的定义可以扩展到包括具有厚厚的岩层支的稳定中原生态地区.
  • 了解岩进化为稳定的大陆群体的出现提供了洞察力.