Ultra high-temperature and subsolidus shear zones: examples from the Poe Mountain anorthosite, Wyoming
作者： Bruno Lafrance , Barbara E John , B.Ronald Frost
DOI: 10.1016/S0191-8141(98)00021-2
关键词: Geology 、 Perpendicular 、 Shear zone 、 Shear (geology) 、 Microstructure 、 Mineralogy 、 Anorthosite 、 Plagioclase 、 Grain boundary 、 Dynamic recrystallization 、 Petrology
摘要: Abstract Ultra high-temperature shear zones formed with interstitial melts present during the emplacement of Poe Mountain anorthosite, Wyoming. The are characterized by coarse-grained plagioclase flat extinction and rare deformation microstructures. Dissected grain microstructures suggest that underwent recrystallization ‘fast’ boundary migration. Orthopyroxene crystallized from as strain-free, foliation-parallel tablet grains. Plagioclase has a magmatic petrofabric, poles to (010) normal foliation, [100] parallel foliation movement direction. Poles (001) have broad distribution point maximum roughly petrofabrics result oriented growth foliation. defines perpendicular [010] [001] great circle distributions approximately Microstructures ultra contrast those granulite-grade cutting across intrusion. initiated fractures, which evolved into dynamic recrystallization. Deformed primary orthopyroxene recrystallized rotation smaller polygonal
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