富含甲和的流体迁移可能会在前弧深处的俯冲区引发地震故障
Francesco Giuntoli1, Luca Menegon2, Guillaume Siron3
1Department of Biological, Geological, and Environmental Sciences, Università degli Studi di Bologna, Bologna, Italy. francesco.giuntoli@unibo.it.
Nature communications
|January 11, 2024
概括
携带甲和的地球深层流体导致前弧区域的岩石破裂. 这种由蛇形化驱动的过程可以通过在构造区产生过高压力导致地震活动.
科学领域:
- 地质化学 地质化学
- 构造学 构造学 构造学 构造学
- 石化学 石化学是一门学科.
背景情况:
- 变态流体通过断层和剪切区域将深层碳和像 (H2) 和碳化合物这样的能源运送到较浅的水库.
- 这种深层能源迁移的确切机制和途径仍然不太清楚.
- 了解这些过程对于理解地球深层碳循环和潜在的地震触发因素至关重要.
研究的目的:
- 为了调查地质证据机械坚固的岩石由于深层液体积累的故障.
- 为了确定在深度前弧设置中减少的,富含能量流体的起源和运输机制.
- 探索流体过压,岩石破裂和地震活动之间的联系.
主要方法:
- 地质现场观测在深前弧深处岩石断层的情况.
- 分析流体组成,特别是富含甲 (CH4) - (H2) 的流体.
- 流体生成和过压发展的热力学建模.
主要成果:
- 地质证据表明,由于积累了CH4-H2丰富的液体,机械强的岩石失败,达到超静态孔液压.
- 这些液体源于碳酸盐减少由H2丰富的液体在化过程中在eclogite-to-blueschist-facies条件下产生.
- 热力学建模证实,富含CH4-H2的液体比富含CO2的液体更有效地产生过压.
结论:
- 地球深层的能源沿着前弧区域的构造学不连续性迁移.
- 富含CH4-H2的液体的积累导致硬岩类型的脆性失败.
- 这一过程可能是前弧深处地震活动的因果因素.
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