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An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho
Abstract Although commonly obscured by simple shear
Although commonly obscured by simple shear, pure shear fabrics occur locally within many metamorphic core complexes. The cover rocks to the Raft River metamorphic core complex exposed within the Black Pine Mountains display an early coaxial strain history which developed prior to the formation of low-angle fault-bounded allochthons. At higher structural levels this is documented by pressure shadows with straight sutures, and oppositely-rotated antitaxial calcite veins. These rocks were sub-horizontally extended parallel to bedding, by up to 160%, in an ≈ E-W direction. The marbles of the lowest exposed levels exhibit well-developed crystallographic preferred orientation fabrics. Calcite c- and a-axis pole figures are symmetric to slightly asymmetric, with obliquities ranging from 0° to 8°, which indicate that the percent pure shear ranges between 100 and 76%. Initial constraints on the timing of this layer-parallel extension suggest that extension was occurring locally within the Sevier belt hinterland during the late Cretaceous. These data, coupled with previous studies, suggest that pure shear might be a much more common component of strain in rocks deformed in extensional environments than is generally acknowledged.
vironments than is generally acknowledged.  +
Author Wells  + , M.L.; Allmendinger  + , R.W.    +
Citation Wells, M.L.; Allmendinger, R.W.  . 1/1/19
Wells, M.L.; Allmendinger, R.W.  . 1/1/1990. [[An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho]]. Journal of Structural Geology. <span title="Missing required info" style="font-weight:bold;color:red;">(!)[[Category:Missing Required Information]]</span> .
sing Required Information]]</span> .  +
DOI http://dx.doi.org/10.1016/0191-8141(90)90059-8  +
Document type Journal Article  +
Name An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho  +
PublicationDate January 1, 1990  +
Publisher Journal of Structural Geology  +
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An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho + , An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho + , An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho + , An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho + , An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho +
Categories References , Reference Materials , Missing Required Information
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Conceptual Model At Raft River Geothermal Area (1990) + Reference material
 
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