期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 15, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL098643
关键词
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资金
- German Research Foundation (DFG) [NE 822/34-1, UR 64/17-1]
- Helmholtz association [MTET: 38.04.04]
- state of Baden-Wurttemberg through bwHPC
- Projekt DEAL
This study investigates the mechanisms of cyclic microfracturing and epitaxial crystal growth in crack-seal veins using a phase-field model. The sealing degree is found to be a key parameter in hydrothermal systems, and multi-crack-seal veins exhibit mechanical weakness in rocks.
Cyclic microfracturing and epitaxial crystal growth have long been recognized in crack-seal veins, but an understanding of a single crack-seal cycle is still missing. Here we present a phase-field model that includes both fracture mechanics of crack propagation, and epitaxial crystal growth on the fracture walls, repeating this cycle multiple times in a polycrystalline, microporous quartz rock. Our simulations have two end members: If a vein completely seals, it is stronger than the host rock, cracking is delocalized, forming many single-seal microveins. Incomplete sealing makes the vein weaker than the host rock and localizes the new fracture inside the vein, leading to multi-crack-seal. We suggest that the sealing degree is a key parameter in hydrothermal systems and multi-crack-seal veins are long-lived, microporous sites of mechanical weakness. We generalize the phase-field approach to conduct probabilistic simulations in between these two types, and show how systems of microveins and multi-crack-seal veins emerge.
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