Large-scale transpressive shear zone patterns and displacements within magmatic arcs: The Coast Plutonic Complex, British Columbia

Article Abstract:

The Coast Pluton Complex, British Columbia is a major magmatic arc of the North American Cordilera, where large scale plutonism has occurred since the Jurassic. The large-scale shear zone pattern of the batholith has been characterized and interpreted, using structural and geochronological published data, combined with new observations. The western area is shown to have undergone regional sinistral transpression and displacements, which could be linked to the southern displacement of transpressional terranes throughout the western margins of North America from the Jurassic to the Early Late Cretaceous.

Mesozoic Era

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Tectonic setting and U/Pb zircon dating of the plutonic Socorro Complex in the Transpressive Rio Paraiba do Sul Shear Belt, SE Brazil

Article Abstract:

The plutonic Socorro Complex of the Precambrian Rio Paraiba do Sul Shear Belt displays magmatic, metamorphic and tectonic features that unmask crosscutting relationships between emplacement and the regional ductile shear zones. U/Pb zircon analysis disclose the temporal overlap in magmatic and tectonic processes. Main igneous activity occurred between 650 and 595 million years ago. The origin of calc-alkaline granites of the Ribeira Belt is attributed to partial melting of the lower crust and a bit of the lithospheric mantle during thickening of the transpressional plate margins.

Origin, Granite

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Zircon U-Pb geochronology of plutonic rocks from the Antarctic Peninsula: confirmation of the presence of unexposed Paleozoic crust

Article Abstract:

Geochronologic investigations, involving zircon U-Pb ages, on a suite of calk-alkaline granitoids from Graham Land, northern Antarctic Peninsula, yield rock ages ranging from 117.0 plus or minus 0.8 Ma to 73.6 plus or minus 0.4 Ma. Inheritance characteristics due to entrainment of older crustal materials are indicated by discordant zircon populations from peraluminous granites. The late Paleozoic sediments of the Trinity Peninsula Group may be a possible source for the inherited components. The early Paleozoic age of the Antarctic Peninsula basement is confirmed by the study.

Paleozoic Era, Rocks, Igneous, Igneous rocks

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