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• W2149875950 abstract "Great Bear Magmatic Zone (l.g75-1.g# Ga)is of regional extent as suggested by Steven and Lipman a linear belt, 100 km wide by g00 km long, of little (1976)? Do ring complexes such as those found in the metamorphosed volcanic rocks and allied plutons of Coast Batholith of Peru (Bussell et al., 1976)represent calc-alkaline affinity. The entire zone was folded the roots of ash flow calderas? If ring fractures shortly after magmatism, and sections many kilometers marginal to calderas dip inward, by what mechanism is thick through several cauldron complexes are exposed. the room problem solved so that the central block is Eruptions of rhyolite led to collapse of Black Bear able to subside? These and many other problems might Cauldron in which 1.5 km of tuff ponded. The cauldron be resolved by careful study of deformed volcano- then became the locus of fluvial and lacustrine plutonic terranes. sedimentation followed by augite-plagioclase This paper describes folded cauldrons located in the porphyritic andesire volcanism, both of which also northwestern Canadian Shield. They are part of the accumulated within the cauldron. Ash flow eruptions of LaBine Group which is a diverse succession of volcanic dacite caused collapse of Clut Cauldron which was and sedimentary rocks that form part of the Great Bear accompanied by landsliding and avalanching of the Magmatic Zone, a 1.875-1.8#0 Ga continental magmatic cauldron walls. Abundant andesitic and intrusive debris arc (Hildebrand, 1982; Hildebrand and Bowring, 198#). is intercalated with the propylitized intracauldron Most of the rocks in the Great Bear Magmatic Zone are facies tuff adjacent to the walls and some blocks are as folded so that sections through the crust up to 10 km large as 1 km across. Clut Cauldron also became the thick are exposed on individual fold limbs. This makes site for flurio-lacustrine sedimentation after collapse the area excellent for studying the major features and was likely resurgent. Resurgence was probably found in calderas such as the topographic wall, related to the eraplacement of a quartz monzonite structural margin, caldera floor and internal pluton which occupies the core of the cauldron. stratigraphy, as well as the more general relationships Cornwall Cauldron, which is exposed entirely in cross of plutonism to ash flow volcanism. section, contains 1-2 km of intracauldron facies tuff overlain by a complex of dacite lava flows. The Regional Geology cauldron was intruded by a granodiorite-monzogranite pluton probably responsible for resurgence. Data from The LaBine Group is widely exposed in the western the area suggest the following: (1) the similarity of part of Wopmay Orogen, an early Proterozoic north early Proterozoic cauldrons to Cenozoic examples trending orogen that developed on the western margin indicates that cauldron collapse is a process that has of the Archean Slave Craton between 2.1 and l.g Ga occurred since 1.9 Ga; (2) batholiths beneath ash flow (Hoffman, 1973, 1980a). The orogen can be divided into tuff fields are probably composite bodies made up of three major tectonic elements whose boundaries many individual plutons; (3) most of the plutons are parallel the trend of the belt as a whole. From east to sheetlike in cross section; and (#) cauldron collapse west they are Coronation Margin, Great Bear Magmatic begins as soon as ash flow eruptions, and relief on the Zone, and Hottab Terrane. cauldron margin becomes large early in the subsidence Coronation Margin represents an early Proterozoic history. west facing passive continental margin (Grotzinger and Hoffman, 1983) and overlying foredeep that were" @default.
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• W2149875950 date "1984-01-01" @default.
• W2149875950 modified "2023-09-27" @default.
• W2149875950 title "FOLDED CAULDRONS OF THE EARLY PROTEROZOIC LABINE GROUP" @default.
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