富含火山的上层地提供了用于浅层巨型推力和缓慢滑动的流体
Andrew C Gase1, Nathan L Bangs1, Demian M Saffer1
1Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, USA.
Science advances
|August 16, 2023
概括
带有火山高原的俯冲区可能会经常出现浅浅的缓慢滑动事件,这是由于地上方存在一个大型,以前未知的液体储库. 这座水库在潜水过程中保留了大量的水,可能导致流体过压.
科学领域:
- 地质物理学 地质物理学
- 潜射区动力学 潜射区动力学
- 水文地质学 水文地质学
背景情况:
- 经常发生的缓慢滑动事件发生在俯冲区,但不是普遍的,流体过压涉及到,但在自然系统中了解得很少.
- 流体含量和水文地质学在推动大冲压断层缓慢滑动事件中的作用尚不清楚.
研究的目的:
- 为了研究Hikurangi平原在Hikurangi边缘的流体的来源和行为.
- 了解地水分,液体含量和缓慢滑动事件的发生之间的联系.
主要方法:
- 在Hikurangi边缘的三维地震成像.
- 海洋钻探,以分析潜入的Hikurangi高原的上层地.
主要成果:
- 在Hikurangi高原 (高达47%的H2O) 的大量水化的火山上层地内发现了一个广泛的流体储.
- 火山级的上层地在沉降过程中脱水,但在缓慢滑动的地区保留了显著的液体含量 (~50%).
- 火山高原上的富含火山的上层地作为潜水区流体预算的重要水源.
结论:
- 希库兰基高原的受水化火山级上层地是潜水带的重要流体来源.
- 这种留存的液体可能导致大推力沿线的液体过压,导致频繁的浅浅缓慢滑动事件.
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