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- W83489924 abstract "Penryn pluton (Pp) and Rocklin pluton (Rp) in central Foothills terrane (Ft), Sierra Nevada have been previously considered to be post-tectonic (post-Nevada orogeny). Preliminary field work and structural analyses suggest that extensive deformation occurred during and after emplacement of the Pp, but largely prior to intrusion of the Rp. The Pp contains many features often associated with forceful emplacement: a foliated aureole with amphibole grade metamorphism superimposed on older wall rock structures and greenschist grade regional metamorphism; regional foliation and bedding are deflected around the pluton and are broadly concordant to the pluton's margin; and a well developed magmatic foliation exists in the whole pluton and is parallel to foliation in the aureole. However, evidence for widespread tectonic deformation is also present: a weak to moderate solid-state foliation superimposed on the magmatic foliation, the intensity of which increases toward the pluton's eastern margin; dikes within the western margin of the pluton contain strong solid-state foliation and lineation; and solid-state stretching lineations both in the pluton and aureole are parallel to the regional stretching direction. The authors interpret the widespread solid-state foliation in the Pp and aureole as syn- or late syn-emplacement because geometries and conditions form a continuum with themore » magmatic foliation. Deformation continued after emplacement of the Pp because the above structures are cut by a subvertical N-S striking shear zone in the wall rocks east of the Pp. The Rp, at the southern end of the Pp, is largely nonfoliated except for a locally developed magmatic foliation. The pluton cuts the regional foliation, bedding, and one strand of the Ft fault system, and thus largely postdates regional deformation. Deformation along the Ft fault system as young as 143--123 Ma also occurs after emplacement of the Pp supporting widespread fault motion of this age in the Ft.« less" @default.
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- W83489924 date "1993-04-01" @default.
- W83489924 modified "2023-09-26" @default.
- W83489924 title "Syn- and post-emplacement deformation of Penryn pluton, central Foothills terrane, Sierra Nevada" @default.
- W83489924 hasPublicationYear "1993" @default.
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