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- W61206916 abstract "In the easternmost Tehachapi mountains a moderately SE dipping fault zone with an irregular trace juxtaposes high grade ductilely deformed footwall gneisses against a cataclastically deformed granitic hanging wall complex from Tehachapi Valley to the Garlock FZ. The fault zone exhibits evidence of both ductile and brittle deformation. Moderately SE plunging stretching lineations and sense of shear indicators in the footwall suggest normal displacement and the sole of the hanging wall consists of a chloritic breccia. The footwall consists of garnet-amphibolite grade orthogneiss, paragneiss, and marble, locally protomylonitic, folded into presently SW vergent isoclinal folds with a penetrative, NW trending, moderately NE dipping foliation. This gneiss complex hosts a 0.2 to 0.8 km wide, NW tending, shallow NE dipping ductile shear zone, called here the eastern Tehachapi shear zone (ETSZ). The ETSZ appears to post-date much of the isoclinal folding in the gneisses. The ETSZ is inferred to continue north of Tehachapi valley (Ross, 1989) where it steepens and swings to a more northerly trend into the Lake Isabella region where it has been called the proto-Kern Canyon fault zone. A post ETSZ deformation refolded the gneisses into open, upright folds with moderately NE plunging axes. Juxtaposition of the gneissesmore » and the cataclastically deformed granitic hanging wall rocks occurred during and/or after this post ETSZ folding event. In the structurally lowest levels of the gneiss complex exposed along the Garlock fault, quartz diorite orthogneiss becomes increasingly deformed downward with an NE striking, moderately NW dipping mylonitic fabric. The youngest deformation in the areas is a series of WNW trending, regional scale antiforms and synforms which exert a first order control on the topography of the region.« less" @default.
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- W61206916 date "1993-04-01" @default.
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- W61206916 title "Structure and tectonic setting of the eastern Tehachapi Range, California" @default.
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