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Showing 1 to 6 of 6 for “"Volcanic Stratigraphy"”.
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Volcanic stratigraphy and lithochemistry of the lower Jurassic Hazelton group, host to the Eskay Creek precious and base metal volcanogenic deposit
… zone. Outer dome facies displays vapor phase volcanic features, devitrification, and enrichment in K, Sb, Ag, Hg. Intense K-silicate, sericitic, and silicic alteration, with precious and base metal mineralization, occurs in the feeder dikes to the rhyolite flow domes. The 21 Zone deposit is …
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High-resolution temporal records of magmatism, sedimentation, and faulting at evolving plate boundaries
… western Washington. Chapter 1 creates a regional stratigraphy for nonmarine sedimentary and volcanic rocks throughout central and western Washington and demonstrates that the depositional history of these rocks is consistent with accretion of over thickened oceanic crust (Siletzia terrane) and …
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An unconformity in the Carolina slate belt of central North Carolina: new evidence for the areal extent of the ca. 600 Ma Virgilina deformation
… can be extended into central North Carolina. The volcanic stratigraphy is composed of the Hyco, Aaron and Uwharrie Formations, all of which have been subjected to greenschist facies metamorphism. The oldest map unit, the Hyco Formation, consists of intermediate(?) lava flows, pyroclastic and …
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Understanding the evolution of compositional zoning in San Juan Volcanic Field ignimbrites using iron isotope ratios
The San Juan Volcanic Field (SJVF) of southwestern Colorado is an erosional remnant of a large Tertiary aged calc-alkaline ignimbrite flare up. Previous work has led to detailed characterization of the volcanic stratigraphy and temporal evolution of many large calderas. Ignimbrites include both …
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Volcanic, structural, and hydrothermal controls on coincident Archean Low and High Sulfidation VMS Systems within the Onaman Assemblage, Onaman-Tashota Greenstone Belt, Northern Ontario, Canada
… traditional “low sulfidation” VMS systems. The stratigraphy of the Onaman assemblage consists of pillowed mafic volcanic flows, volcaniclastic rocks, and felsic flows and domes. The assemblage hosts a metamorphosed alteration system defined by kyanite and chloritoid-bearing mineral associations …