Reaction-assisted hierarchical fracturing during serpentinization

摘要: Abstract Hierarchical fracture patterns are the result of a fracturing process that successively divides rocks into smaller domains. In 2D (outcrop) section such characterized by four sided domains, and T-junctions where new fractures stop growing at right angles to pre-existing fractures. Here, we describe mm dm thick serpentinized orthopyroxenite dykes in dunite matrix from Leka Ophiolite Complex Nord-Trondelag, Norway. The is driven volume changes associated with serpentinization dunites. During this extended expanding undergo considerable fracturing. resulting hierarchical. cumulative distributions lengths show scaling behavior lies between log–normal power law (fractal) distribution. This consistent simple fragmentation model which domains divided according ‘top hat’ distribution positions within unfractured Reaction-assisted hierarchical also likely be responsible for other structures commonly observed ultramafic rocks, including mesh-textures individual olivine grains, high abundance rectangular wide range scales. mechanism may provide first-order controls on fluid migration rates variety geological settings.