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- W1803741669 abstract "Recent work suggests that the northwest- to northeast-trending foliation typical of the Northern Sierra terrane is Middle Jurassic in age. Evidence of younger, Early Cretaceous deformation related to the emplacement of the Rattlesnake Creek pluton is present in a ductile shear zone that occurs along the wester n margin of the pluton and is termed the Big Bend shear zone. The Rattlesnake Creek pluton has yielded an U/Pb zircon age of 120 ± 2 Ma and intrudes th e Middle Jurassic Emigrant Gap composite pluton as well as the Lower to Middle Jurassic Sailor Canyon and Tuttle Lake Formations. The Big Bend shear zone is up to 1 km wide, at least 15 km long, and generally parallels the margin of the Rattlesnake Creek pluton, but diverges from it to the north before disappearing under Cenozoic cover. Within the shear zone, fine-grained rocks in the uppermost part of the Sailor Canyon Formation develop a schistosity. Andesitic tuff-breccias of the overlying Tuttle Lake Formation contain intensely flattened clasts in a schistose matrix, in which the schistosit y is defined by alignment of metamorphic biotite and hornblende. A steeply plunging mineral lineation lying in the foliation parallels the long axes of elongated metavolcanic clasts. Diorite of the Emigrant Gap composite pluton also is penetratively foliated within the shear zone. The Rattlesnake Creek pluton contains a weak magmatic foliation parallel to the contact and truncates the shear zone where the contact is locally discordant. Granitic dikes become abundant in the shear zone near the contact with the Rattlesnak e Creek pluton. Some dikes are boudinaged or isoclinally folded and cut by the foliation in the host rocks, whereas others cut the foliation but are weakly folded along the same trend. These relations suggest that granitic magma was present during the ductile shearing event, but that emplacement of the pluton postdated much of the shearing. Cross-cutting relations between the Early Cretaceous ductile foliation of the shear zone and the preexisting Middle Jurassic regional slaty cleavage are absent, indicating that the two deformational events were coaxial." @default.
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- W1803741669 date "1997-01-01" @default.
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- W1803741669 title "The Big Bend Shear Zone: Early Cretaceous Ductile Deformation Associated with Pluton Emplacement in the Northern Sierra Terrane, California" @default.
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