The life cycle of suprasubduction zone ophiolites
... Figure 2. Idealized life cycle of a suprasubduction zone ophiolite, based on the example of the Coast Range ophiolite in California. (a) Stage 1: Birth. Flow of MORB-source asthenosphere into the wedge beneath the extending lithosphere, which is fluxed with fluids from the sinking slab. Melting occu ...
... Figure 2. Idealized life cycle of a suprasubduction zone ophiolite, based on the example of the Coast Range ophiolite in California. (a) Stage 1: Birth. Flow of MORB-source asthenosphere into the wedge beneath the extending lithosphere, which is fluxed with fluids from the sinking slab. Melting occu ...
Shervais, J.W., 2001, Birth, Death, and Resurrection: The Life Cycle
... Figure 2. Idealized life cycle of a suprasubduction zone ophiolite, based on the example of the Coast Range ophiolite in California. (a) Stage 1: Birth. Flow of MORB-source asthenosphere into the wedge beneath the extending lithosphere, which is fluxed with fluids from the sinking slab. Melting occu ...
... Figure 2. Idealized life cycle of a suprasubduction zone ophiolite, based on the example of the Coast Range ophiolite in California. (a) Stage 1: Birth. Flow of MORB-source asthenosphere into the wedge beneath the extending lithosphere, which is fluxed with fluids from the sinking slab. Melting occu ...
1 MELT VISCOSITY, TEMPERATURE AND TRANSPORT
... Baragar et al. [10] observe that the high- and low-Ti dikes in the Troodos sheeted complex and in CCSP Hole CY-4 have no preferred age relationship so that both types of dikes were injected penecontemporaneously and in close proximity along the spreading center. The chemical stratification of the Tr ...
... Baragar et al. [10] observe that the high- and low-Ti dikes in the Troodos sheeted complex and in CCSP Hole CY-4 have no preferred age relationship so that both types of dikes were injected penecontemporaneously and in close proximity along the spreading center. The chemical stratification of the Tr ...
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... cone complex that was active between 2·76 and 1·34 Ma. Basalts were erupted at more than 14 centers scattered over a region 40 km in diameter. Alkali basalt was erupted first, followed by sub-alkaline basalt. Quasi-concentric expansion of eruption centers coinciding with uplift and with decreasing a ...
... cone complex that was active between 2·76 and 1·34 Ma. Basalts were erupted at more than 14 centers scattered over a region 40 km in diameter. Alkali basalt was erupted first, followed by sub-alkaline basalt. Quasi-concentric expansion of eruption centers coinciding with uplift and with decreasing a ...
ABSTRACT Callovian to early Kimmeridgian (Unitary Keywords: ophiolite, age, CRO, cordillera,
... The Mesozoic geology of California south of the Klamath Mountains comprises three main provinces, from east to west: The Sierra Nevada magmatic arc province, the Great Valley forearc province, and the Franciscan accretionary complex (Fig. 1). The Sierra Nevada province consists of island arc volcani ...
... The Mesozoic geology of California south of the Klamath Mountains comprises three main provinces, from east to west: The Sierra Nevada magmatic arc province, the Great Valley forearc province, and the Franciscan accretionary complex (Fig. 1). The Sierra Nevada province consists of island arc volcani ...
to the PDF file. - CURVE
... Figure 12: Dacitic-rhyolitic cone of sample 10-BV-48 from the Shoshone range which appeared to have lava tunnels up the side determined possibly to be weathered out Campbell Creek Tuff with a near-vertical flow attitude (enclosed in border)....................37 Figure 13: Outcrop (A) and hand sampl ...
... Figure 12: Dacitic-rhyolitic cone of sample 10-BV-48 from the Shoshone range which appeared to have lava tunnels up the side determined possibly to be weathered out Campbell Creek Tuff with a near-vertical flow attitude (enclosed in border)....................37 Figure 13: Outcrop (A) and hand sampl ...
The Architecture, Chemistry, and Evolution of - Cin
... subduction they are found significantly inland compared with the average distance from the trench; such is the case with the belt of arc-related magmatism that formed during the Laramide orogeny (75–35 Ma) in the interior of the North American Cordillera due to shallow subduction (Barton 1996). This ...
... subduction they are found significantly inland compared with the average distance from the trench; such is the case with the belt of arc-related magmatism that formed during the Laramide orogeny (75–35 Ma) in the interior of the North American Cordillera due to shallow subduction (Barton 1996). This ...
Magma Genesis and Mantle Dynamics at the Harrat Ash
... are comparable with the crustal xenoliths occurring in the lavas (Nasir, 1992, 1995). The basement in Syria is overlain by predominantly flat-lying Phanerozoic marine and continental sediments (Sharkov et al., 1994). Seismic reflection data, as well as refraction profiling, have shown that the metam ...
... are comparable with the crustal xenoliths occurring in the lavas (Nasir, 1992, 1995). The basement in Syria is overlain by predominantly flat-lying Phanerozoic marine and continental sediments (Sharkov et al., 1994). Seismic reflection data, as well as refraction profiling, have shown that the metam ...
The Petrogenetic Evolution of Lavas from Easter
... Easter Island has a roughly triangular shape with the three volcanoes Poike, Rano Kau and Terevaka on each corner (Fig. 1b). Its surface area is ~160 km2 and it rises to 510 m above sea-level. A 50 km long submarine ridge, the Rano Kau Ridge, extends from Rano Kau volcano towards the southwest (Hage ...
... Easter Island has a roughly triangular shape with the three volcanoes Poike, Rano Kau and Terevaka on each corner (Fig. 1b). Its surface area is ~160 km2 and it rises to 510 m above sea-level. A 50 km long submarine ridge, the Rano Kau Ridge, extends from Rano Kau volcano towards the southwest (Hage ...
The Architecture, Chemistry, and Evolution of Continental Magmatic
... subduction they are found significantly inland compared with the average distance from the trench; such is the case with the belt of arc-related magmatism that formed during the Laramide orogeny (75–35 Ma) in the interior of the North American Cordillera due to shallow subduction (Barton 1996). This ...
... subduction they are found significantly inland compared with the average distance from the trench; such is the case with the belt of arc-related magmatism that formed during the Laramide orogeny (75–35 Ma) in the interior of the North American Cordillera due to shallow subduction (Barton 1996). This ...
The role of magmatically driven lithospheric thickening on arc front
... steady crustal thickness is achieved that results in a more stationary arc front with long-lived mantle melting. This appears to be the case for some island arcs. Thus, in combination with tectonic modulation of crustal thickness, magmatic thickening provides a self consistent model for volcanic arc ...
... steady crustal thickness is achieved that results in a more stationary arc front with long-lived mantle melting. This appears to be the case for some island arcs. Thus, in combination with tectonic modulation of crustal thickness, magmatic thickening provides a self consistent model for volcanic arc ...
EDS011 - GeologyOntario
... depositional sequences, which are colour-coded and number 1 through 10 on Chart D, and P1 through P10 on Tectonic Assemblages of Ontario maps 2575 to 2578. Not all of the boundaries of these sequences are marked by unequivocal unconformities (e.g., boundaries between sequences 2 and 3, and between 4 ...
... depositional sequences, which are colour-coded and number 1 through 10 on Chart D, and P1 through P10 on Tectonic Assemblages of Ontario maps 2575 to 2578. Not all of the boundaries of these sequences are marked by unequivocal unconformities (e.g., boundaries between sequences 2 and 3, and between 4 ...
Hafnium isotope evidence for slab melt contributions in the Central
... types of lavas are closely related geographically and temporally. Distinct from the high-Nb lavas, the calcalkaline lavas show trends toward higher 176Hf/177Hf and 143Nd/144Nd ratios coupled with lower Lu/Hf. The high Hf–Nd isotope ratios fingerprint contributions of subducted basaltic ocean crust, w ...
... types of lavas are closely related geographically and temporally. Distinct from the high-Nb lavas, the calcalkaline lavas show trends toward higher 176Hf/177Hf and 143Nd/144Nd ratios coupled with lower Lu/Hf. The high Hf–Nd isotope ratios fingerprint contributions of subducted basaltic ocean crust, w ...
Geological Society of America Bulletin
... mountain ranges (Burke et al., 1977). As a result of such spectacular events, the termination of subduction is widely appreciated and readily envisioned by geologists, largely because the geologic evidence for why, when, and how subduction ends is sufficiently well preserved that a detailed history ...
... mountain ranges (Burke et al., 1977). As a result of such spectacular events, the termination of subduction is widely appreciated and readily envisioned by geologists, largely because the geologic evidence for why, when, and how subduction ends is sufficiently well preserved that a detailed history ...
Geology of Galapagos
... idea of ‘hot-spots’, rooted deep in the mantle, supplying lava to and through the overlying crustal plates as they move slowly along. T h e Hawaiian Islands have been the type example of this process, with ages growing progressively older to the north-west (in the direction of plate movement) from t ...
... idea of ‘hot-spots’, rooted deep in the mantle, supplying lava to and through the overlying crustal plates as they move slowly along. T h e Hawaiian Islands have been the type example of this process, with ages growing progressively older to the north-west (in the direction of plate movement) from t ...
Mineralogy and Petrology of Tertiary
... (1970) to represent reversely magnetized basalt that is older than the flows to the southwest. Mabey and Oriel (1970) also observed negative magnetic anomalies in Lower, Wooley, and Upper Valleys and at the southern end of Enoch Valley, which were interpreted to result from reversely magnetized basa ...
... (1970) to represent reversely magnetized basalt that is older than the flows to the southwest. Mabey and Oriel (1970) also observed negative magnetic anomalies in Lower, Wooley, and Upper Valleys and at the southern end of Enoch Valley, which were interpreted to result from reversely magnetized basa ...
2. Neogene Tectonic Evolution of the New Hebrides Island Arc
... Evolution of the New Hebrides Island Arc occurred primarily during the Neogene, when, as part of the Vitiaz Arc it was ripped away from Fiji and Tonga and rotated clockwise (westward) to its present position. A combination of subduction polarity reversal, backarc spreading, and ridge-arc collision i ...
... Evolution of the New Hebrides Island Arc occurred primarily during the Neogene, when, as part of the Vitiaz Arc it was ripped away from Fiji and Tonga and rotated clockwise (westward) to its present position. A combination of subduction polarity reversal, backarc spreading, and ridge-arc collision i ...
The track of the Yellowstone hot spot
... Myers and Hamilton (1964), in their analysis of the 1959 Hebgen Lake earthquake, suggested that active, range-front faulting on the Teton and Centennial ranges is related to the SRPYellowstone trend, which they considered a rift zone. Smith and Sbar ( 1974) suggest that radial stress distribution ou ...
... Myers and Hamilton (1964), in their analysis of the 1959 Hebgen Lake earthquake, suggested that active, range-front faulting on the Teton and Centennial ranges is related to the SRPYellowstone trend, which they considered a rift zone. Smith and Sbar ( 1974) suggest that radial stress distribution ou ...
Cedar Butte and Cogenetic Quaternary Rhyolite Domes of the
... personal communication, 1994), and are also present in an uplifted block of basalt on the east side of Big Southern Butte (Fishel, 1993). These observations suggest the volcano originally extended ~20 km across its base. Cedar Butte volcano may therefore have had a total volume of well over 10 km3 - ...
... personal communication, 1994), and are also present in an uplifted block of basalt on the east side of Big Southern Butte (Fishel, 1993). These observations suggest the volcano originally extended ~20 km across its base. Cedar Butte volcano may therefore have had a total volume of well over 10 km3 - ...
The Indonesian Sedimentologists Forum (FOSI)
... called Sunda Shelf, currently separated from the mainland by a sea strait. By contrast Lombok is an oceanic island; it rises from the ocean floor in isolation and is not part of the continental shelf. Both Bali and Lombok are parts of Sunda inner volcanic arc, formed after the mid-Miocene (< 15 Ma). ...
... called Sunda Shelf, currently separated from the mainland by a sea strait. By contrast Lombok is an oceanic island; it rises from the ocean floor in isolation and is not part of the continental shelf. Both Bali and Lombok are parts of Sunda inner volcanic arc, formed after the mid-Miocene (< 15 Ma). ...
The anatomy and ontogeny of modern intra
... long as plate tectonics has operated. IOASs’ crustal profiles are wedge-shaped, with crust up to 20–35 km thick; a more useful definition is that IOASs occur as chains of small islands, generally just the tops of the largest volcanoes. A very small fraction of IOASs lie above sea level, but advancin ...
... long as plate tectonics has operated. IOASs’ crustal profiles are wedge-shaped, with crust up to 20–35 km thick; a more useful definition is that IOASs occur as chains of small islands, generally just the tops of the largest volcanoes. A very small fraction of IOASs lie above sea level, but advancin ...
Multi-Stage Origin of the Coast Range Ophiolite, Supra-Subduction Zone Ophiolites
... The Coast Range ophiolite of California is one of the most extensive ophiolite terranes in North America, extending over 700 km from the northernmost Sacramento Valley to the southern Transverse Ranges in central California. This ophiolite, and other ophiolite remnants with similar midJurassic ages, ...
... The Coast Range ophiolite of California is one of the most extensive ophiolite terranes in North America, extending over 700 km from the northernmost Sacramento Valley to the southern Transverse Ranges in central California. This ophiolite, and other ophiolite remnants with similar midJurassic ages, ...
Volcanic Geology and Mineralization in the Chinati Caldera
... ongoing study of the volcanic stratigraphy, caldera activity, and known and potential mineralization of the Chinati Mountains areaof Trans-Pecos Texas. Many ore deposits are spatiallyassociated with calderas andother volcanic centers. A geneticrelationshipbetween calderas and base and precious metal ...
... ongoing study of the volcanic stratigraphy, caldera activity, and known and potential mineralization of the Chinati Mountains areaof Trans-Pecos Texas. Many ore deposits are spatiallyassociated with calderas andother volcanic centers. A geneticrelationshipbetween calderas and base and precious metal ...
IODP Proposal Cover Sheet
... The spatial and temporal evolution of arc magmas within a single oceanic arc is fundamental to understanding the initiation and evolution of oceanic arcs and the genesis of continental crust, which is one key objective of the IODP ISP. The Izu-Bonin-Mariana arc has been a target for this task for ma ...
... The spatial and temporal evolution of arc magmas within a single oceanic arc is fundamental to understanding the initiation and evolution of oceanic arcs and the genesis of continental crust, which is one key objective of the IODP ISP. The Izu-Bonin-Mariana arc has been a target for this task for ma ...
Rift-Related Transition from Andesite to Rhyolite
... mushes fed by basalt with 1wt % H2O (dominated by a pyroxene^plagioclase assemblage) release andesitic melts at the extraction window. These melts then erupt at the surface to form the observed andesitic part of the arc. With a slightly higher water content (2 wt %) in the basalt, the melt composit ...
... mushes fed by basalt with 1wt % H2O (dominated by a pyroxene^plagioclase assemblage) release andesitic melts at the extraction window. These melts then erupt at the surface to form the observed andesitic part of the arc. With a slightly higher water content (2 wt %) in the basalt, the melt composit ...
Geology of the Pacific Northwest
The geology of the Pacific Northwest refers to the study of the composition (including rock, minerals, and soils), structure, physical properties and the processes that shape the Pacific Northwest region of the United States and Canada. The geology of the region produces much of the area's scenic beauty and also causes periodic catastrophes, such as volcanoes and earthquakes.There are at least five geologic provinces in the area: the Cascade Volcanoes, the Columbia Plateau, the North Cascades, the Coast Mountains, and the Insular Mountains. The Cascade Volcanoes are an active volcanic region along the western side of the Pacific Northwest. The Columbia Plateau is a region of subdued geography that is inland of the Cascade Volcanoes, and the North Cascades are a mountainous region in the northwest corner of the United States, extending into British Columbia. The Coast Mountains and Insular Mountains are a strip of mountains along the coast of British Columbia, each with its own geological history.The geology of the Pacific Northwest is vast, complex and confusing. Most of the region was formed about 200 million years ago as the North American Plate started to drift westward during the rupture of Pangaea. Since that date, the western edge of North America has grown westward as a succession of island arcs and assorted ocean-floor rocks have been added along the continental margin.