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GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Canada
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Construction, emplacement, and geochemical evolution of deep-crustal intrusions: Tenpeak and Dirtyface plutons, North Cascades, western North America
Using mineral geochemistry to decipher slab, mantle, and crustal input in the generation of high-Mg andesites and basaltic andesites from the northern Cascade Arc
Subduction erosion of the Jurassic Talkeetna-Bonanza arc and the Mesozoic accretionary tectonics of western North America
Correlation among lower to upper crustal components in an island arc: the Jurassic Bonanza arc, Vancouver Island, Canada
Evolution of magmas in continental and oceanic arcs; the role of the lower crust
High-Mg, low-Al bulk composition of the Talkeetna island arc, Alaska: Implications for primary magmas and the nature of arc crust
The deep crust of an early Paleozoic arc; The Sierra de Fiambalá, northwestern Argentina
The Sierra de Fiambalá, located in the northwestern Sierras Pampeanas, northwestern Argentina, exposes deep crustal igneous and metasedimentary rocks from the Paleozoic Gondwana margin. These rocks were affected by multiple episodes of deformation, metamorphism, and intrusion. The first phase of deformation involved the formation of a foliation (S 1 ) during greenschist-facies metamorphism. The second phase of deformation was contemporaneous with amphibolite- to granulite-facies metamorphism and involved isoclinal folding with axial planar (S 2 ) foliation. The intrusion of a granitic pluton (La Puntilla Orthogneiss) pre-dated the S 2 foliation and metamorphism. The intrusion of the Fiambalá Gabbronorite was contemporaneous with S 2 structures and high-grade metamorphism in the Early Ordovician. The final intrusions were post-trectonic granites. The trace element chemistry of the Fiambalá Gabbronorite indicates a subduction-related setting for magmatism and deformation during the Early Ordovician. Pressure estimates from metamorphic assemblages coeval with the gabbronorite are 7 to 8 kbar (~25 km). We interpret the Sierra de Fiambalá to be an exhumed exposure from the deep levels of a magmatic arc that developed along the early Paleozoic Gondwana margin. The described tectonothermal events in the Sierra de Fiambalá arc exposure are generally consistent with events that occurred in coeval deep-crustal and supracrustal exposures from other areas along the Gondwana margin. These observations allow a preliminary reconstruction of the various components from the early Paleozoic Gondwana active margin.