Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4733058 | Journal of Structural Geology | 2015 | 13 Pages |
•Omphacite fabrics in eclogite record LS- to L-type fabrics that developed at high pressure.•Quartz in eclogite preserves prism
Petrofabrics and trace-element thermobarometry of deformed quartzofeldspathic gneiss and associated coesite-bearing eclogite in the Salt Mylonite Zone (Western Gneiss Region, Norway) document a pressure–temperature–deformation path from ultrahigh-pressure to amphibolite-facies conditions. The Salt mylonite zone is dominated by quartzofeldspathic gneiss with a strong foliation and lineation. Coesite-bearing eclogite within the shear zone contains a foliation and lineation (defined by elongate omphacite) consistent with that of the host gneiss, suggesting that gneiss and eclogite were deformed in the same kinematic framework. In eclogite, omphacite preserves LS- to L-type crystallographic preferred orientation, and quartz preserves prism