Geology and geodynamics of Iceland
... continental rifting and break-up (Saunders et al. 1997). The accumulation of such a plume head is normally ascribed to the uppermost mantle arrival of a starting plume, but could also result from an existing plume channel by increased plume flux. An extended period of continental lithospheric cappin ...
... continental rifting and break-up (Saunders et al. 1997). The accumulation of such a plume head is normally ascribed to the uppermost mantle arrival of a starting plume, but could also result from an existing plume channel by increased plume flux. An extended period of continental lithospheric cappin ...
Faulting and hydration of the Juan de Fuca plate system
... largely restricted to crustal levels. If dehydration embrittlement is an important mechanism for triggering intermediate-depth earthquakes within the subducting slab, then the limited occurrence rate and magnitude of intraslab seismicity at the Cascadia margin may in part be explained by the limited ...
... largely restricted to crustal levels. If dehydration embrittlement is an important mechanism for triggering intermediate-depth earthquakes within the subducting slab, then the limited occurrence rate and magnitude of intraslab seismicity at the Cascadia margin may in part be explained by the limited ...
Faulting and hydration of the Juan de Fuca plate system
... largely restricted to crustal levels. If dehydration embrittlement is an important mechanism for triggering intermediate-depth earthquakes within the subducting slab, then the limited occurrence rate and magnitude of intraslab seismicity at the Cascadia margin may in part be explained by the limited ...
... largely restricted to crustal levels. If dehydration embrittlement is an important mechanism for triggering intermediate-depth earthquakes within the subducting slab, then the limited occurrence rate and magnitude of intraslab seismicity at the Cascadia margin may in part be explained by the limited ...
Why is subduction on the Earth one-sided?
... Subduction of the lithosphere at convergent-plate boundaries takes place asymmetrically— the subducted slab sinks downward, while the overriding plate moves horizontally (one-sided subduction). In contrast, global mantle convection models generally predict downwelling of both plates at convergent ma ...
... Subduction of the lithosphere at convergent-plate boundaries takes place asymmetrically— the subducted slab sinks downward, while the overriding plate moves horizontally (one-sided subduction). In contrast, global mantle convection models generally predict downwelling of both plates at convergent ma ...
SiphonPaper_TextOnly_141124 - UC Santa Cruz
... Abstract: Most seafloor hydrothermal circulation occurs far from the magmatic influence of mid-ocean ridges, driving large flows of water, heat and solutes through volcanic rock outcrops on ridge flanks. We created three-dimensional simulations of ridge-flank hydrothermal circulation, flowing betwee ...
... Abstract: Most seafloor hydrothermal circulation occurs far from the magmatic influence of mid-ocean ridges, driving large flows of water, heat and solutes through volcanic rock outcrops on ridge flanks. We created three-dimensional simulations of ridge-flank hydrothermal circulation, flowing betwee ...
Subduction of oceanic lithosphere
... Stevenson [1992] and Stern [1998]). Water is carried in the descending slab (A), and dense aqueous fluids are continuously released from subducted sediments, crust, and serpentinites (B). These fluids rise into the overlying mantle to form hydrous phases in mantle peridotite (C). Amphiboles are show ...
... Stevenson [1992] and Stern [1998]). Water is carried in the descending slab (A), and dense aqueous fluids are continuously released from subducted sediments, crust, and serpentinites (B). These fluids rise into the overlying mantle to form hydrous phases in mantle peridotite (C). Amphiboles are show ...
Tectonic evolution of a continental collision zone
... conditions must be satisfied to allow for continental subduction in nature. In particular, the competing deformation modes, such as RT instability, folding or pure shear should be relatively slow, and the upward drag due to the positively buoyant crust and viscous shear should not negate the downwar ...
... conditions must be satisfied to allow for continental subduction in nature. In particular, the competing deformation modes, such as RT instability, folding or pure shear should be relatively slow, and the upward drag due to the positively buoyant crust and viscous shear should not negate the downwar ...
PACRIM 2015 Congress, Hong Kong, China, 18
... intrusions and by substantial hydrothermal magnetite as veins and disseminations in association with chalcopyrite and lesser bornite in sheeted and stockwork veins. Drilling has intersected high-grade porphyry Cu-Au mineralisation along the transition zone between an inner potassic assemblage and a ...
... intrusions and by substantial hydrothermal magnetite as veins and disseminations in association with chalcopyrite and lesser bornite in sheeted and stockwork veins. Drilling has intersected high-grade porphyry Cu-Au mineralisation along the transition zone between an inner potassic assemblage and a ...
Insights into the lithospheric structure and tectonic setting of the
... compilation is generally flat over large parts of the Barents Sea region (Fig. 2b). From the Atlantic continent–ocean boundary in the west to Novaya Zemlya, Moho depth varies only between 32.5 and 37.5 km. In the Western Barents Sea (32.5–35 km) the depth is slightly less than in the Eastern Barents ...
... compilation is generally flat over large parts of the Barents Sea region (Fig. 2b). From the Atlantic continent–ocean boundary in the west to Novaya Zemlya, Moho depth varies only between 32.5 and 37.5 km. In the Western Barents Sea (32.5–35 km) the depth is slightly less than in the Eastern Barents ...
Pressure, Temperature, Fluid Pressure Conditions of
... corresponds to the onset of partial melting of a given rock system: metamorphic rocks recording high-temperature recrystallization associated with partial melting display granitic melt layers and/or pockets closely associated with restitic rock volumes. The latter appear depleted in fusible componen ...
... corresponds to the onset of partial melting of a given rock system: metamorphic rocks recording high-temperature recrystallization associated with partial melting display granitic melt layers and/or pockets closely associated with restitic rock volumes. The latter appear depleted in fusible componen ...
The Moho beneath western Tibet: Shear zones and
... The Tibetan crustal structure at 80°E is sub-divided into segments delimited by the major tectonic boundaries. Beneath the southern half of the Lhasa block between 31.3°N and 32.5°N (Fig. 5, from IYS to SF), a large amplitude Ps conversion can be seen with a time delay of ~9 s relative to the P phas ...
... The Tibetan crustal structure at 80°E is sub-divided into segments delimited by the major tectonic boundaries. Beneath the southern half of the Lhasa block between 31.3°N and 32.5°N (Fig. 5, from IYS to SF), a large amplitude Ps conversion can be seen with a time delay of ~9 s relative to the P phas ...
Presentation - Copernicus.org
... 2009,2012) that cratons possess rigid mantle keels which extend well into the TZ, the rigidity being for the same fluid-content Hirth & Kohlstedt 1996 reason as I have applied here to the LVZ at MORs. So, when a craton splits or two Archaean cratons separate, as they have done in the NE Atlantic, th ...
... 2009,2012) that cratons possess rigid mantle keels which extend well into the TZ, the rigidity being for the same fluid-content Hirth & Kohlstedt 1996 reason as I have applied here to the LVZ at MORs. So, when a craton splits or two Archaean cratons separate, as they have done in the NE Atlantic, th ...
What are the FOUR (4) WAYS our Earth*s PLATES MOVE?
... When plates move, tsunamis happen. What kind of RARE plate movement is this? Ocean to Ocean plate converging! ...
... When plates move, tsunamis happen. What kind of RARE plate movement is this? Ocean to Ocean plate converging! ...
HeidiBerkenbosch - University of Washington
... underneath a tectonic plate; a similar mechanism formed the Hawaiian Islands. The hot magma rising from the mantle plume underneath the plate is lighter in density than the overlying crust. The magma pushes up against the thin oceanic crust, creating cracks, which it then leaks through until eventua ...
... underneath a tectonic plate; a similar mechanism formed the Hawaiian Islands. The hot magma rising from the mantle plume underneath the plate is lighter in density than the overlying crust. The magma pushes up against the thin oceanic crust, creating cracks, which it then leaks through until eventua ...
The cold and relatively dry nature of mantle forearcs in subduction
... the predicted water content for fully hydrated forearcs, we find that forearcs could sequester a total of 2.6 × 1010 Tg of H2O globally, or about 2% of the mass of current global ocean water. From the slab dehydration models we estimate that 0.4 × 108 Tg per million years (Myrs) of H2O is released b ...
... the predicted water content for fully hydrated forearcs, we find that forearcs could sequester a total of 2.6 × 1010 Tg of H2O globally, or about 2% of the mass of current global ocean water. From the slab dehydration models we estimate that 0.4 × 108 Tg per million years (Myrs) of H2O is released b ...
The Sulfide Minerals Deposit in the Geothermal Pipes of Dieng
... sulfidation state of the hydrothermal fluid into high-, intermediate- and low sulfidation hydrothermal fluid. Study of epithermal and porphyry types hydrothermal system shows that the sulfidation state at certain temperature will affect the type of sulfide minerals to be formed. Therefore, the sulfi ...
... sulfidation state of the hydrothermal fluid into high-, intermediate- and low sulfidation hydrothermal fluid. Study of epithermal and porphyry types hydrothermal system shows that the sulfidation state at certain temperature will affect the type of sulfide minerals to be formed. Therefore, the sulfi ...
5. tectonics of cretaceous and tertiary deposits
... 3.1 The geotectonic margins of the Danish Basin The tectonics in the Danish Basin is strongly dominated by the Sorgenfrei-Tornquist Zone. This zone extends from the Baltic Sea, where it includes the island of Bornholm and the Rønne Graben, crosses the south-western corner of Sweden, from where it tr ...
... 3.1 The geotectonic margins of the Danish Basin The tectonics in the Danish Basin is strongly dominated by the Sorgenfrei-Tornquist Zone. This zone extends from the Baltic Sea, where it includes the island of Bornholm and the Rønne Graben, crosses the south-western corner of Sweden, from where it tr ...
Consulta: subjectFacets:"Crustal structure" Registros recuperados
... the trough from the continental shelf off Lewis to normal oceanic crust west of Lousy Bank in NW-SE direction. The other line ( line D) intersects with line E, crosses the Wyville-Thomson Ridge in a SW-NE direction and ends in the Faeroe-Shetland Basin. Sonobuoy data and expanding spread profiles ac ...
... the trough from the continental shelf off Lewis to normal oceanic crust west of Lousy Bank in NW-SE direction. The other line ( line D) intersects with line E, crosses the Wyville-Thomson Ridge in a SW-NE direction and ends in the Faeroe-Shetland Basin. Sonobuoy data and expanding spread profiles ac ...
Cascadia subducting plate fluids channelled to fore
... depth where the temperature reaches 200–400°C, much of this water is released from basalt porosity collapse. At greater depths where the temperature reaches 400–500°C, much of the water in crustal hydrated mineral assemblages should be released. Although the breakdown temperatures and pressures are ...
... depth where the temperature reaches 200–400°C, much of this water is released from basalt porosity collapse. At greater depths where the temperature reaches 400–500°C, much of the water in crustal hydrated mineral assemblages should be released. Although the breakdown temperatures and pressures are ...
Mass balance related to UHP metamorphism in subduction zones
... - largely immobile (done) - global deep mass balance ...
... - largely immobile (done) - global deep mass balance ...
Geodynamics of congested subduction zones
... Moresi, L., Betts, P. G., Miller, M. S., & Cayley, R. A. (2014). Dynamics of continental accretion. Nature. doi:10.1038/nature13033 ...
... Moresi, L., Betts, P. G., Miller, M. S., & Cayley, R. A. (2014). Dynamics of continental accretion. Nature. doi:10.1038/nature13033 ...
Chapter 18 18 1 Introduction 2 Geodynamic Setting 2.1 Present
... sq. km area with the multibeam echosounder Sea-Falcon. We combined these data with the existing hydrosweep resulting in a nearly continuous complete mapping of the continental slope between 62°30’ – 65°30’E & 23°–25°N (Fig. 3). During the second part of the cruise, around 1000 km of multichannel sei ...
... sq. km area with the multibeam echosounder Sea-Falcon. We combined these data with the existing hydrosweep resulting in a nearly continuous complete mapping of the continental slope between 62°30’ – 65°30’E & 23°–25°N (Fig. 3). During the second part of the cruise, around 1000 km of multichannel sei ...
Chapter 32: Plate Tectonics: A Working Model for the Earth
... southeast end of the chain. As one proceeds up the chain to the northwest, successive islands are progressively older, a fact inferred by geologists years ago from the states of erosion of the various islands and confirmed now by radiometric dating of the basalts. It appears that the same heat sourc ...
... southeast end of the chain. As one proceeds up the chain to the northwest, successive islands are progressively older, a fact inferred by geologists years ago from the states of erosion of the various islands and confirmed now by radiometric dating of the basalts. It appears that the same heat sourc ...
A Model for the Plate Tectonic Evolution of the Eastern
... environments associated with past and present plate interactions. A better understanding of present-day settings and the dynamic history of plate interactions are critical to man’s future. The Eastern Mediterranean region has had a complex tectonic history since the early Mesozoic breakup of Gondwan ...
... environments associated with past and present plate interactions. A better understanding of present-day settings and the dynamic history of plate interactions are critical to man’s future. The Eastern Mediterranean region has had a complex tectonic history since the early Mesozoic breakup of Gondwan ...
Effects of Hydrothermal Cooling and Magma Injection on Mid
... is first used to calculate axial temperature structure, and deformation is then modeled in 2-D vertical sections of lithosphere using a visco-plastic finite element model. Strain-rate softening in the brittle regime is used to simulate the rate-dependence of frictional strength observed in laborator ...
... is first used to calculate axial temperature structure, and deformation is then modeled in 2-D vertical sections of lithosphere using a visco-plastic finite element model. Strain-rate softening in the brittle regime is used to simulate the rate-dependence of frictional strength observed in laborator ...