Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 118, Issue 10, Pages 5236-5251Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013JB010540
Keywords
fractures; veins; crack-seal; discrete element method; DEM; vein networks
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Funding
- ExxonMobil Production Deutschland GmbH
- GDF SUEZ E&P Deutschland GmbH
- RWE Dea AG
- Wintershall Holding GmbH
- WEG Wirtschaftsverband Erdol- und Erdgasgewinnung e.V.
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We investigate how existing veins interact with extension fractures in rocks using 3-D Discrete Element Method models with a geometry inspired by tension tests with notched samples. In a sensitivity study, we varied (a) the angle between the vein and the bulk extension direction and (b) the strength ratio between host rock and vein material. Results show a range of vein-fracture interactions, which fall into different, robust, structural styles. Veins, which are weaker than the host rock, tend to localize fracturing into the vein, even at high-misorientation angles. Veins, which are stronger than the host rock, cause deflection of the fracture tip along the vein-host rock interface. Fractures are arrested at the interface from weak to stronger material. When propagating from a stronger to a weaker material, macroscopic bifurcation of the fracture is common. Complex interactions are favored by a low angle between the vein and the fracture and by high-strength contrast. The structural styles in the models show good agreement with microstructures and mesostructures of crack-seal veins found in natural systems. We propose that these structural styles form the basis for criteria to recognize strength contrasts and stress of crack-seal systems in nature.
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