Constraining deformation stages in brittle-ductile shear zones from combined field mapping and 40 AR/ 39 Ar dating: The structural evolution of the Grimsel Pass area (Aar Massif, Swiss Alps)
40Ar/39Ar dating of syn-kinematic white mica (phengite) and biotite is used to constrain the age of shear zones within the granodiorites of the Grimsel Pass area (Aar Massif, Central Alps). Three sets of steeply dipping shear zones have been mapped. Stage 1 shear zones are very broad (∼200 m wide) zones of biotite-bearing rocks, with a progressive increase in intensity of ductile deformation from rim to core, and have dip-slip kinematics. Subsequent Stage 2 shear zones are narrower, contain...[Show more]
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|Source:||Journal of Structural Geology|
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