TY - JOUR
T1 - Deformational styles in the Proterozoic Pinal Schist, Pinal Peak, Arizona
T2 - microstructural and quartz c-axis analyses
AU - Keep, M.
AU - Hansen, V. L.
PY - 1994
Y1 - 1994
N2 - A >5km thick, north-dipping shear zone in the Pinal Peak map area, near Globe, Arizona, reveals contact metamorphism of the Pinal Schist through intrusion of the Proterozoic Madera Diorite. In Pinal Schist, sillimanite and rare andalusite occur in the metamorphic aureole around the diorite, but not elsewhere in this or adjoining map areas, where metamorphic grade is interpreted to be low greenschist facies. Deformation was synchronous in the schist and the diorite and is recorded by a well-developed, generally N- and NW-trending elongation lineation. From microstructural and quartz c-axis analyses it is concluded that the Madera Diorite was pre-tectonic and that Pinal Schist and Madera Diorite were deformed synchronously, at relatively shallow crustal levels in a contractional shear zone. The overall character of the shear zone reflects strain partitioning at a crustal scale. -from Authors
AB - A >5km thick, north-dipping shear zone in the Pinal Peak map area, near Globe, Arizona, reveals contact metamorphism of the Pinal Schist through intrusion of the Proterozoic Madera Diorite. In Pinal Schist, sillimanite and rare andalusite occur in the metamorphic aureole around the diorite, but not elsewhere in this or adjoining map areas, where metamorphic grade is interpreted to be low greenschist facies. Deformation was synchronous in the schist and the diorite and is recorded by a well-developed, generally N- and NW-trending elongation lineation. From microstructural and quartz c-axis analyses it is concluded that the Madera Diorite was pre-tectonic and that Pinal Schist and Madera Diorite were deformed synchronously, at relatively shallow crustal levels in a contractional shear zone. The overall character of the shear zone reflects strain partitioning at a crustal scale. -from Authors
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U2 - 10.1086/629665
DO - 10.1086/629665
M3 - Article
AN - SCOPUS:0028325580
SN - 0022-1376
VL - 102
SP - 229
EP - 242
JO - Journal of Geology
JF - Journal of Geology
IS - 2
ER -