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Porphyroblast inclusion‐trail orientation data: eppure non son girate * !
Author(s) -
BELL T. H.,
JOHNSON S. E.,
DAVIS B.,
FORDE A.,
HAYWARD N.,
WILKINS C.
Publication year - 1992
Publication title -
journal of metamorphic geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.639
H-Index - 114
eISSN - 1525-1314
pISSN - 0263-4929
DOI - 10.1111/j.1525-1314.1992.tb00084.x
Subject(s) - geology , lineation , metamorphic rock , tectonics , deformation (meteorology) , shear zone , overprinting , shear (geology) , seismology , paleontology , oceanography
Extensive examination of large numbers of spatially orientated thin sections of orientated samples from orogens of all ages around the world has demonstrated that porphyroblasts do not rotate relative to geographical coordinates during highly non‐coaxial ductile deformation of the matrix subsequent to their growth. This has been demonstrated for all tectonic environments so far investigated. The work also has provided new insights and data on metamorphic, structural and tectonic processes including: (1) the intimate control of deformation partitioning on metamorphic reactions; (2) solutions to the lack of correlation between lineations that indicate the direction of movement within thrusts and shear zones, and relative plate motion; and (3) a possible technique for determining the direction of relative plate motion that caused orogenesis in ancient orogens.