根据基于3D建模的菲律宾海底沉降区下方的叠加板块脱水,脱碳和地震构造变化
Ye Zhu1,2, Yingfeng Ji3,4, Weiling Zhu1,2
1State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China.
菲律宾的降温板块几何和热演变影响地震和火山活动. 多种板块脱水和脱碳过程驱动巨型冲击地震和富含碳的岩石.
科学领域:
- 地质物理学 地质物理学
- 地质化学 地质化学
- 构造学 构造学 构造学 构造学
背景情况:
- 菲律宾经常发生火山喷发和地震,这与海洋板块的沉降有关.
- 板块变形,水-碳循环和俯冲区地震性 (巨型冲击地震和缓慢滑动事件) 之间的相互作用尚未得到充分理解.
- 了解引板的热演变对于破译这些复杂的过程至关重要.
研究的目的:
- 在菲律宾的俯冲区,调查俯冲区地震性和长期板块脱水-脱碳演变之间的关系.
- 探索板块几何和热梯度如何影响地震性和弧火山运动.
主要方法:
- 开发了一种综合热模型,包括3D板块几何和3D降温速度场.
- 利用MORVEL板块运动数据集进行高分辨率的空间和时间分析.
- 分析了热梯度和板块脱水率.
主要成果:
- 俯冲地震和弧火山活动集中在热度梯度高 (>5°C/km) 和板块显著脱水 (>0.05 wt%/km) 的地区.
- 蛇酸盐脱水和碳酸盐脱碳是产生流体和融化的关键过程,促进地震性和岩石性.
- 不同的板块几何形状促进相邻的脱水-脱碳,大大促进了前弓巨力地震.
结论:
- 岩石的几何形状和相关的脱水-脱碳过程是菲律宾潜水带地震和火山活动的关键驱动因素.
- 这些发现凸显了理解潜伏区流体和融生成对于预测地震危险和岩活动的重要性.
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