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ductile shear zones
These rocks occur exclusively in high-temperature ductile shear zones, which can develop either during the primary exhumation of rock complexes or during the overprinting by high-temperature dynamometamorphism.
      
Ductile shear zones developed in Archean granulite gneisses simultaneously with their exhumation, and, hence, their P-T trajectories are segments of decompression and/or isobaric cooling paths.
      
Straight gneisses in Proterozoic polymetamorphic complexes commonly compose high-temperature ductile shear zones overprinted on Archean granulite complexes, and the P-T paths of these rocks are Z-shaped.
      
Such ductile shear zones commonly have a strike-slip morphology and can be easily seen in aerial photographs and discerned during structural geological surveying.
      
The control of ductile shear zones over gold mineralization could be explained in view of pressure solution of gold-bearing miner als under shearing stress and the resultant mobilization of this metal.
      
The shape and distribution of orebodies are controlled by brittle-ductile shear zones; (3) Multistage wall-rock alteration.
      
This style and degree of deformation are not developed elsewhere in the immediate area which suggests that ductile shear zones in the Gairloch Schist Belt were preferentially initiated near and localized around the meta-exhalative horizons.
      
Gold deposits in the province are mostly hosted in brittle-ductile shear zones, and were formed at a late stage in the history of metamorphism, deformation and granitoid emplacement.
      
The development of high-sulphidation hydrothermal systems synchronous with deformation along brittle-ductile shear zones is a predictable consequence of intrusive activity during deformation in areas characterised by a high geothermal gradient.
      
Brittle-ductile shear zones are shallow-dipping, NW to NE striking, or are steep-dipping to the south and west.
      
It is located in a 500-m-wide, N-S trending, structural corridor consisting of an anastomosing set of brittle-ductile shear zones and is chiefly hosted by tholeiitic basalts, which are metamorphosed at mid- to upper-greenschist facies.
      
Within the Deakin South open cut, gold mineralization is hosted in brittle-ductile shear zones primarily developed within the dacitic Mitchell Porphyry.
      
Mineralization took place during brittle reactivation (D3) of pre-existing D2 ductile shear zones.
      
Calcite texture development in experimentally induced ductile shear zones
      
Based on lithological, structural and geophysical characteristics, the Proterozoic Grenville Orogen of southern Ontario and New York has been divided into domains that are separated from each other by ductile shear zones.
      
700°C, 7-8 kbar) is related to recrystallization in narrow ductile shear zones and secondary growth on M2 minerals.
      
External introduction of oxidising aqueous solutions along a system of interconnected ductile shear zones adequately explains the dramatic increase in the fO2.
      
Younger deformations with a top-to-the-N sense of movement have affected Nevado-Filábride (ductile shear zones), Alpujárride (ductile and brittle shear zones) and Maláguide rocks (normal faults).
      
Electronically conducting brittle-ductile shear zones in the crystalline basement of Rittsteig (Bohemian Massif, Germany): Evide
      
The magmatic foliation, ductile shear zones and granite-pegmatite filled fractures were mapped as well as the metamorphic foliation and extension lineation in the metamorphic host rocks.
      
 

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