由变形构造学驱动的碎片撕裂和细分的沉降终点
Brandon Shuck1,2, Brian Boston3, Suzanne M Carbotte2
1Louisiana State University, Baton Rouge, LA, USA.
Science advances
|September 24, 2025
概括
接近海沟的中海山脊会导致沉降的终结和板块的脱落. 这项研究揭示了变换边界如何驱动横向二次时态板块碎片化和俯冲停止.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 地质地质地质地质地质地
背景情况:
- 沉降终止发生在浮动的中海脊石层抵制沉降时,导致板块脱离和板块边界重新配置.
- 由于现代示例有限,人们对潜水终结期间板块撕裂的空间和时间动态知之甚少.
研究的目的:
- 调查卡斯卡迪亚北部山脊-海沟-断层三重交叉点的活跃碎片化的俯冲系统.
- 了解即将发生的沉降终结和相关的板块碎片化过程.
主要方法:
- 整合新的地震成像与区域地震性数据.
- 一个-沟-断层三连接系统的分析.
主要成果:
- 一个广的剪切区域始于400万年前,利用海洋石层的织物.
- 剪切区域逐渐定位为转换边界,切断海洋微板.
- 沟平行板块撕裂的成像被转换边界抵消,表明横向撕裂的传播.
结论:
- 变形边界驱动横向的二次性板块碎片化和俯冲终点.
- 卡斯卡迪亚沉降系统是即将结束的沉降系统的现代例子.
- 碎片撕裂有助于微板脱,同时允许相邻的沉降继续.
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