期刊
MINERALS
卷 8, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/min8060241
关键词
retrograde serpentinite; slickenfibre veins; (001) sliding; pressure solution; brittle-ductile deformation; friction coefficient; weakness
资金
- Marsden Fund Council [UOO1417]
- Marie Sklodowska-Curie Fellowship (STRAIN) [748400]
- Marie Curie Actions (MSCA) [748400] Funding Source: Marie Curie Actions (MSCA)
Serpentinites play a key role in controlling fault rheology in a wide range of geodynamic settings, from oceanic and continental rift zones to subduction zones. In this paper, we provide a summary of the most common deformation mechanisms and frictional strengths of serpentine minerals and serpentinites. We focus on deformation mechanisms in retrograde serpentinites, which show a progressive evolution from undeformed mesh and bastite pseudomorphic textures to foliated, ribbon-like textures formed by lizardite with strong crystallographic and shape preferred orientations. We also discuss the possible mechanical significance of anastomosing slickenfibre veins containing ultraweak fibrous serpentines or relatively strong splintery antigorite. Our review and new observations indicate that pressure solution and frictional sliding are the most important deformation mechanisms in retrograde serpentinite, and that they are frictionally weak (mu similar to 0.3). The mineralogical and microstructural evolution of retrograde serpentinites during shearing suggests that a further reduction of the friction coefficient to mu of 0.15 or less may occur during deformation, resulting in a sort of continuous feedback weakening mechanism.
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