Thermal Structure due to Solid-State Flow in the Mantle
... the Talkeetna arc section in Alaska, and then presents thermal models that are consistent with these PT estimates. We show that, with a temperaturedependent rheology, cooling of material in the mantle wedge causes this material to adhere to the subducting plate, advectively removing part of the ther ...
... the Talkeetna arc section in Alaska, and then presents thermal models that are consistent with these PT estimates. We show that, with a temperaturedependent rheology, cooling of material in the mantle wedge causes this material to adhere to the subducting plate, advectively removing part of the ther ...
here - W. Steven Holbrook
... These differences in internal structure and bulk composition indicate that, if island arcs serve as building blocks of continental crust, their properties are significantly altered during or after accretion to a continental margin. Two processes must occur in order to transform Aleutian island-arc c ...
... These differences in internal structure and bulk composition indicate that, if island arcs serve as building blocks of continental crust, their properties are significantly altered during or after accretion to a continental margin. Two processes must occur in order to transform Aleutian island-arc c ...
Tectonic controls on the nature of large silicic calderas in volcanic arcs
... convergence rate except in arcs with backarc spreading, which have few or no calderas. Calderas located on oceanic and young continental crust are predominantly dacitic, whereas rhyolitic calderas are mainly located on Mesozoic or older continental crust under extension. Occurrence does not increase ...
... convergence rate except in arcs with backarc spreading, which have few or no calderas. Calderas located on oceanic and young continental crust are predominantly dacitic, whereas rhyolitic calderas are mainly located on Mesozoic or older continental crust under extension. Occurrence does not increase ...
Geophysical assessment of migration and storage conditions of
... zones (see Unsworth and Rondenay 2013). Among the different seismic observables, a reduction in seismic velocities and quality factor Q can be used to infer fluidbearing regions at depth and define fluid pathways (e.g., Syracuse et al. 2008; Rychert et al. 2008). In particular, seismic wave attenuat ...
... zones (see Unsworth and Rondenay 2013). Among the different seismic observables, a reduction in seismic velocities and quality factor Q can be used to infer fluidbearing regions at depth and define fluid pathways (e.g., Syracuse et al. 2008; Rychert et al. 2008). In particular, seismic wave attenuat ...
Ultrahigh-pressure metamorphism: tracing continental crust into the
... More and more evidence is being discovered in Phanerozoic collision belts of the burial of crustal rocks to previously unsuspected (and ever increasing) depths, presently on the order of 150^200 km, and of exhumation from such depths. This extends by almost one order of magnitude the depth classical ...
... More and more evidence is being discovered in Phanerozoic collision belts of the burial of crustal rocks to previously unsuspected (and ever increasing) depths, presently on the order of 150^200 km, and of exhumation from such depths. This extends by almost one order of magnitude the depth classical ...
Eduard Suess` conception of the Alpine orogeny related to
... In his treatise „Die Entstehung der Alpen“, Eduard Suess presents a wealth of geological observations and a fascinating conception of the orogeny of the Alps and mountain chains in general. It is an inspiring task to review the state of the Physics of the Earth at the time when Suess worked on this ...
... In his treatise „Die Entstehung der Alpen“, Eduard Suess presents a wealth of geological observations and a fascinating conception of the orogeny of the Alps and mountain chains in general. It is an inspiring task to review the state of the Physics of the Earth at the time when Suess worked on this ...
Origin and evolution of the lower crust in magmatic
... Moho. Dynamic calculations indicate that foundering is an episodic process that occurs in most arcs with a periodicity of half a million to five million years. Because foundering will continue after arc magmatism ceases, this process ultimately results in formation of the continental Moho. Jagoutz & ...
... Moho. Dynamic calculations indicate that foundering is an episodic process that occurs in most arcs with a periodicity of half a million to five million years. Because foundering will continue after arc magmatism ceases, this process ultimately results in formation of the continental Moho. Jagoutz & ...
PPT - nsf margins
... California extending to depths of ~150 km that are still attached to the unsubducted Guadalupe and Magdalena microplates The Isabella or Great Valley or Central Valley anomaly in southern California is probably a slab remnant still attached to the Monterrey unsubducted microplate rather than sinking ...
... California extending to depths of ~150 km that are still attached to the unsubducted Guadalupe and Magdalena microplates The Isabella or Great Valley or Central Valley anomaly in southern California is probably a slab remnant still attached to the Monterrey unsubducted microplate rather than sinking ...
Slide 1 - Global Heat Flow Database
... The transect across the Cascades between latitudes 45 N to 49 N shows a narrow band of high HFD over the volcanic arc followed by a gradual increase in HFD from 60 mW m-2 to 80 mW m-2 over a distance of about 800 km. In the region of the Idaho Batholith, between 800 km and 1150 km, HFD is about 80 ...
... The transect across the Cascades between latitudes 45 N to 49 N shows a narrow band of high HFD over the volcanic arc followed by a gradual increase in HFD from 60 mW m-2 to 80 mW m-2 over a distance of about 800 km. In the region of the Idaho Batholith, between 800 km and 1150 km, HFD is about 80 ...
evidence from Th, Sr and Pb isotope data for Tonga
... the relative contributions of subducted sediment, subducted oceanic crust, and mantle wedge to the trace element budget of Tonga-Kermadec lavas. Quantitative modelling of these data is presented elsewhere (Ewart et al., submitted). The purpose of this discussion is to demonstrate that along-arc vari ...
... the relative contributions of subducted sediment, subducted oceanic crust, and mantle wedge to the trace element budget of Tonga-Kermadec lavas. Quantitative modelling of these data is presented elsewhere (Ewart et al., submitted). The purpose of this discussion is to demonstrate that along-arc vari ...
Densities of metapelitic rocks at high to ultrahigh
... continental crust is significantly lighter than the ultrabasic upper mantle. To test this implication, we have investigated density changes of major components of continental crust, in particular metagreywacke and metapelite, as a function of pressure and temperature using a Gibbs free energy minimi ...
... continental crust is significantly lighter than the ultrabasic upper mantle. To test this implication, we have investigated density changes of major components of continental crust, in particular metagreywacke and metapelite, as a function of pressure and temperature using a Gibbs free energy minimi ...
Plateau uplift in western Canada caused by lithospheric
... increase at ∼150 km depth is required to fit our dispersion data, but is incompatible with a velocity–depth profile for a homogeneous asthenosphere under adiabatic conditions (Supplementary Information). This velocity increase was also detected by previous surface-wave tomography19 and S-receiver fu ...
... increase at ∼150 km depth is required to fit our dispersion data, but is incompatible with a velocity–depth profile for a homogeneous asthenosphere under adiabatic conditions (Supplementary Information). This velocity increase was also detected by previous surface-wave tomography19 and S-receiver fu ...
church_hall
... reason low-Ti ophiolites are .commonly considered to have formed in back-arc ocean basins. The similarity, particularly in rare-earth-element pat- tems'. of the very low Ti rocks in low-Ti ophiolites to arc boninites would, however, support the suggestion by Pearce et al- (1984) that such Ophiolites ...
... reason low-Ti ophiolites are .commonly considered to have formed in back-arc ocean basins. The similarity, particularly in rare-earth-element pat- tems'. of the very low Ti rocks in low-Ti ophiolites to arc boninites would, however, support the suggestion by Pearce et al- (1984) that such Ophiolites ...
CHAPTER 2 GEOLOGIC INVESTIGATIONS IN WESTERN SAUDI
... Observation of a volcanic eruption at Madinah in 654 AH (1256 AD) were made by AlQastalani, who reported that “a fire burst out in the direction of Al-Hijaz; it resembled a vast city with a turreted and battlemented fort, in which men appears to be drawing the flame about, as it were, while it roare ...
... Observation of a volcanic eruption at Madinah in 654 AH (1256 AD) were made by AlQastalani, who reported that “a fire burst out in the direction of Al-Hijaz; it resembled a vast city with a turreted and battlemented fort, in which men appears to be drawing the flame about, as it were, while it roare ...
A petrologic case for Eocene slab break
... 750–800 8C (Inger and Harris, 1992; Harris et al., 1993; Patiño-Douce and Harris, 1998; Fig. 1). Biotite dehydration-melting at higher temperatures is also possible (e.g., Ganguly et al., 2000). However, workers dispute how the dehydration-melting reactions were crossed and how chronologic simultan ...
... 750–800 8C (Inger and Harris, 1992; Harris et al., 1993; Patiño-Douce and Harris, 1998; Fig. 1). Biotite dehydration-melting at higher temperatures is also possible (e.g., Ganguly et al., 2000). However, workers dispute how the dehydration-melting reactions were crossed and how chronologic simultan ...
Spontaneous development of arcuate single‐sided subduction in
... Another distinctive dynamical feature of a subduction zone is its migration with respect to a “stable” reference frame like the lower mantle. It was noted early on by Elsasser [1971] that the Atlantic Ocean is opening in an east-west direction, and the opposite side of the spherical surface (i.e., t ...
... Another distinctive dynamical feature of a subduction zone is its migration with respect to a “stable” reference frame like the lower mantle. It was noted early on by Elsasser [1971] that the Atlantic Ocean is opening in an east-west direction, and the opposite side of the spherical surface (i.e., t ...
Mantle structure and tectonic history of SE Asia
... limited period of time, of the order of 10 to 25 Ma, depending on rates of subduction. A longer subduction history may be recorded in the lower mantle. Like many other workers, but not all (e.g. Anderson, 2007; Hamilton, 2007), we consider that parts, or all, of subducted slabs often enter the lower ...
... limited period of time, of the order of 10 to 25 Ma, depending on rates of subduction. A longer subduction history may be recorded in the lower mantle. Like many other workers, but not all (e.g. Anderson, 2007; Hamilton, 2007), we consider that parts, or all, of subducted slabs often enter the lower ...
The placement of the Trans-European Suture Zone on the Romanian... electromagnetic arguments
... Running over a distance of 2000 km, the Trans-European Suture Zone (TESZ) is stratching from Denmark and the north German Lowlands, through Poland, Ukraine and Romania. It is documented by paleomagnetic data that this important geological boundary in Europe separates the mobile Phanerozoic terranes, ...
... Running over a distance of 2000 km, the Trans-European Suture Zone (TESZ) is stratching from Denmark and the north German Lowlands, through Poland, Ukraine and Romania. It is documented by paleomagnetic data that this important geological boundary in Europe separates the mobile Phanerozoic terranes, ...
hall_church_comments
... (Dion 1987; Thibault 1987; Thy; 1987) indicates that the latter is entirely related to the low-Ti series, and is characterized by the crystallization sequence 0l-Cpx-Opx-Plag-Amph or 01-Cpx-Plag-Opx-Amph (Dion 1987, p. 44; Thibault 1987, p. 28). Thy (1987), however, claims that the less fractionated ...
... (Dion 1987; Thibault 1987; Thy; 1987) indicates that the latter is entirely related to the low-Ti series, and is characterized by the crystallization sequence 0l-Cpx-Opx-Plag-Amph or 01-Cpx-Plag-Opx-Amph (Dion 1987, p. 44; Thibault 1987, p. 28). Thy (1987), however, claims that the less fractionated ...
︎PDF - Fabio Crameri
... Another distinctive dynamical feature of a subduction zone is its migration with respect to a “stable” reference frame like the lower mantle. It was noted early on by Elsasser [1971] that the Atlantic Ocean is opening in an east-west direction, and the opposite side of the spherical surface (i.e., t ...
... Another distinctive dynamical feature of a subduction zone is its migration with respect to a “stable” reference frame like the lower mantle. It was noted early on by Elsasser [1971] that the Atlantic Ocean is opening in an east-west direction, and the opposite side of the spherical surface (i.e., t ...
Earth and Planetary Science Letters
... for the bulk mantle, the model of Nizkous et al. (2006) for the uppermost mantle, and that of Shapiro et al. (2000) for the crust. We build a database of P-S conversion points beneath the central point of the three stations (lat: 160.63, lon: 55.96) relying on the TauP algorithm (Crotwell et al., 19 ...
... for the bulk mantle, the model of Nizkous et al. (2006) for the uppermost mantle, and that of Shapiro et al. (2000) for the crust. We build a database of P-S conversion points beneath the central point of the three stations (lat: 160.63, lon: 55.96) relying on the TauP algorithm (Crotwell et al., 19 ...
Late 20th Century Tests of the Continental Drift Hypothesis
... • By around 1960 a number of new observations about the seafloor made a few people re-think the idea of drift. • Characteristics of the ridges (which we’ll examine in detail after we’ve finished paleomag) and trenches (after that) and the emerging idea of magnetic field reversals recorded in oceanic ...
... • By around 1960 a number of new observations about the seafloor made a few people re-think the idea of drift. • Characteristics of the ridges (which we’ll examine in detail after we’ve finished paleomag) and trenches (after that) and the emerging idea of magnetic field reversals recorded in oceanic ...
Subduction erosion modes: Comparing finite
... have been estimated in the central Andes due to subduction erosion (Kukowski and Oncken, 2006). Elsewhere, higher rates of ca. 10 km Ma− 1 have been associated with topographic asperities on the lower plate (e.g. Clift et al., 2003). Possible mechanisms for this mode of subduction erosion include du ...
... have been estimated in the central Andes due to subduction erosion (Kukowski and Oncken, 2006). Elsewhere, higher rates of ca. 10 km Ma− 1 have been associated with topographic asperities on the lower plate (e.g. Clift et al., 2003). Possible mechanisms for this mode of subduction erosion include du ...
The global range of subduction zone thermal structures from
... Gerya et al. (2002) model a generic subduction zone and allow for self-organization of large-scale flow patterns of material within a region of relatively low viscosity that develops above the subducting slab – the subduction channel (see Fig. 1B). The configuration of this model is based on previous ...
... Gerya et al. (2002) model a generic subduction zone and allow for self-organization of large-scale flow patterns of material within a region of relatively low viscosity that develops above the subducting slab – the subduction channel (see Fig. 1B). The configuration of this model is based on previous ...
A three-component plan of drilling and monitoring around a
... of knowledge of behaviors in subduction zones, and have developed an asperity model. Large slip regions associated with great earthquakes are not changed spatially (Tokachi and Miyagi), where coupling between the slab and continental plate is strong during interseismic phase (Kanto, Tokai, Nankai, a ...
... of knowledge of behaviors in subduction zones, and have developed an asperity model. Large slip regions associated with great earthquakes are not changed spatially (Tokachi and Miyagi), where coupling between the slab and continental plate is strong during interseismic phase (Kanto, Tokai, Nankai, a ...