- ERA - University of Alberta
... lithosphere; crustal flow in a lower-crust channel can cause the surface to invert to become a topographic high. Magmatism caused by lithosphere removal depends on the removal style and the initial thermal structure of lithosphere. During a Rayleigh-Taylor instability (drip), three types of magmas a ...
... lithosphere; crustal flow in a lower-crust channel can cause the surface to invert to become a topographic high. Magmatism caused by lithosphere removal depends on the removal style and the initial thermal structure of lithosphere. During a Rayleigh-Taylor instability (drip), three types of magmas a ...
- Free Documents
... boundary and partitioned the lithosphere into structural domains Keep et al.. Contrasting with that. the geology of Timor. . . .. Sumba became detached and rotated clockwise AudleyCharles . SoeriaAtmadja et al. rifting began some Ma ago. Fortuin et al. The main objection to Australian provenance for ...
... boundary and partitioned the lithosphere into structural domains Keep et al.. Contrasting with that. the geology of Timor. . . .. Sumba became detached and rotated clockwise AudleyCharles . SoeriaAtmadja et al. rifting began some Ma ago. Fortuin et al. The main objection to Australian provenance for ...
Thematic Article A bathymetric overview of the Mariana forearc
... Abstract Bathymetric data at a 200-m contour interval for the entire Mariana forearc, from south of 13°N to 25°N, permits the ®rst comprehensive overview of this feature. The Mariana forearc represents a sediment-starved end-member. The forearc in its southern and central sections is divisible into ...
... Abstract Bathymetric data at a 200-m contour interval for the entire Mariana forearc, from south of 13°N to 25°N, permits the ®rst comprehensive overview of this feature. The Mariana forearc represents a sediment-starved end-member. The forearc in its southern and central sections is divisible into ...
Ascent of the ultrahigh-pressure Western Gneiss Region, Norway.
... separated by high-pressure rocks. Disparate eclogite ages suggest that the northern UHP domain and the two southern UHP domains are separate crustal blocks that experienced and were exhumed from UHP conditions at different times. The UHP rocks underwent isothermal decompression to <20 km depth in ~5 ...
... separated by high-pressure rocks. Disparate eclogite ages suggest that the northern UHP domain and the two southern UHP domains are separate crustal blocks that experienced and were exhumed from UHP conditions at different times. The UHP rocks underwent isothermal decompression to <20 km depth in ~5 ...
Depth distribution of Moho and tectonic framework in eastern Asian
... From west to east, the main part of this region includes the southern margin of the west Siberia plain, the Kazakhstan hill and its southern neighboring regions (such as Balkhash Lake, Isaac Lake and Baykal Lake), the Junggar Basin in China, the northern area of the Mongolia Plateau, and the belt of ...
... From west to east, the main part of this region includes the southern margin of the west Siberia plain, the Kazakhstan hill and its southern neighboring regions (such as Balkhash Lake, Isaac Lake and Baykal Lake), the Junggar Basin in China, the northern area of the Mongolia Plateau, and the belt of ...
Plate dynamics, mantle structure and tectonic evolution of the
... 1.1 Short overview of the tectonic history of the Caribbean plate The Caribbean plate (Figure 1.1) is an actively deforming region between two major subduction zones: the Lesser Antilles subduction zone in the east and the Central America subduction zone in the west. The northern boundary with the N ...
... 1.1 Short overview of the tectonic history of the Caribbean plate The Caribbean plate (Figure 1.1) is an actively deforming region between two major subduction zones: the Lesser Antilles subduction zone in the east and the Central America subduction zone in the west. The northern boundary with the N ...
3.20 Trace Element and Isotopic Fluxes
... and metamorphism along the subduction pathway. The focus in this contribution is largely on the chemical and isotopic tracers commonly employed to elucidate chemical cycling in subduction zones based on study of arc lavas, and on discussion of metamorphic suites for which it is possible to evaluate ...
... and metamorphism along the subduction pathway. The focus in this contribution is largely on the chemical and isotopic tracers commonly employed to elucidate chemical cycling in subduction zones based on study of arc lavas, and on discussion of metamorphic suites for which it is possible to evaluate ...
Serpentinization of the forearc mantle
... sediments with increasing pressure and temperature. Estimated £uid production rates of V0.1 mm/yr or 100 m/Myr (Fig. 5) suggest that over several tens of Myr enough water is released from the subducting oceanic crust and sediments to hydrate the entire forearc mantle [4,29]. The main factors control ...
... sediments with increasing pressure and temperature. Estimated £uid production rates of V0.1 mm/yr or 100 m/Myr (Fig. 5) suggest that over several tens of Myr enough water is released from the subducting oceanic crust and sediments to hydrate the entire forearc mantle [4,29]. The main factors control ...
pdf file - University of Victoria
... temperatures. These former subduction zones were cut off by the Queen Charlotte and San Andreas transform faults in the Cenozoic. Their high temperatures have not significantly declined because the thermal decay time after subduction stops is 300-500 m.y. (e.g., Currie and Hyndman, 2006; Sleep, 2005 ...
... temperatures. These former subduction zones were cut off by the Queen Charlotte and San Andreas transform faults in the Cenozoic. Their high temperatures have not significantly declined because the thermal decay time after subduction stops is 300-500 m.y. (e.g., Currie and Hyndman, 2006; Sleep, 2005 ...
Geodynamic models of Cordilleran orogens
... Chile: Geological Society of America Memoir 212, p. 1–22, doi:10.1130/2015.1212(01). For permission to copy, contact [email protected]. © 2014 The Geological Society of America. All rights reserved. ...
... Chile: Geological Society of America Memoir 212, p. 1–22, doi:10.1130/2015.1212(01). For permission to copy, contact [email protected]. © 2014 The Geological Society of America. All rights reserved. ...
UHP metamorphism in garnet peridotite, Cuaba unit, Rio San Juan
... garnet, clinopyroxene, spinel, and corundum suggest pressures from 2.8 Gpa (810 °C) to 3.5 Gpa (740 °C). These high-P/T (UHP) conditions are at odds with other indications (1, 2, 4, above) for low-P/T conditions. The contradiction highlights the unusual character of the rocks, but may be consistent ...
... garnet, clinopyroxene, spinel, and corundum suggest pressures from 2.8 Gpa (810 °C) to 3.5 Gpa (740 °C). These high-P/T (UHP) conditions are at odds with other indications (1, 2, 4, above) for low-P/T conditions. The contradiction highlights the unusual character of the rocks, but may be consistent ...
Geophysical Journal International - E
... and their Iberian and Moroccan forelands. Crustal thickness values show strong lateral variations in the southern Iberia peninsula, ranging from ∼19 to ∼46 km. The Variscan foreland is characterized by a relatively flat Moho at ∼31 km depth, and an average v P /v S ratio of ∼1.72, similar to other V ...
... and their Iberian and Moroccan forelands. Crustal thickness values show strong lateral variations in the southern Iberia peninsula, ranging from ∼19 to ∼46 km. The Variscan foreland is characterized by a relatively flat Moho at ∼31 km depth, and an average v P /v S ratio of ∼1.72, similar to other V ...
Mantle structure and tectonic history of SE Asia
... References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
... References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Extrapolating Oceanic Age Distributions
... global mean spreading rate, global mean ocean basin depth, and implications for global mean sea level. Subduction has already removed 50% of oceanic lithosphere younger than 55.7 Ma, making some level of extrapolation a necessary part of global plate reconstructions. An area equal in size to the Pac ...
... global mean spreading rate, global mean ocean basin depth, and implications for global mean sea level. Subduction has already removed 50% of oceanic lithosphere younger than 55.7 Ma, making some level of extrapolation a necessary part of global plate reconstructions. An area equal in size to the Pac ...
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 ...
Incipient shortening of a passive margin: the mechanical roles of
... 1 I N T RO D U C T I O N By definition, a passive margin is tectonically stable. It forms as a result of continental break-up, after prolonged rifting. During a later tectonic cycle the margin may become involved in collision or subduction; but before that, the only admissible style of deformation i ...
... 1 I N T RO D U C T I O N By definition, a passive margin is tectonically stable. It forms as a result of continental break-up, after prolonged rifting. During a later tectonic cycle the margin may become involved in collision or subduction; but before that, the only admissible style of deformation i ...
︎PDF - Fabio Crameri
... Subduction zones are one of the most prominent features on a planet that undergoes plate tectonics, not only in terms of surface morphology but also in terms of the planet’s dynamic evolution. Its importance for the dynamics is highlighted by the fact that the sinking portions of a plate (i.e., slab ...
... Subduction zones are one of the most prominent features on a planet that undergoes plate tectonics, not only in terms of surface morphology but also in terms of the planet’s dynamic evolution. Its importance for the dynamics is highlighted by the fact that the sinking portions of a plate (i.e., slab ...
1 Imaging the transition from flat to normal subduction: Variations in
... therein for a complete discussion of the origin of the Nazca Ridge). The oceanic crustal thickness ...
... therein for a complete discussion of the origin of the Nazca Ridge). The oceanic crustal thickness ...
PDF
... represent a forearc and backarc basin sequence, respectively. These inferences are most simply resolved with a tectonic model whereby the intra-oceanic Kohistan arc evolved over a south-dipping subduction zone, implying that Kohistan and India moved northwards on the same plate, although separated, ...
... represent a forearc and backarc basin sequence, respectively. These inferences are most simply resolved with a tectonic model whereby the intra-oceanic Kohistan arc evolved over a south-dipping subduction zone, implying that Kohistan and India moved northwards on the same plate, although separated, ...
Geophysical assessment of migration and storage conditions of
... Southwest Japan, Kawano et al. 2011), suggesting a continuous hydration of the mantle wedge due to upward fluid migration along the subduction interface. In colder environments, comparable fluid and subduction velocities (e.g., approximately 10 cm/year in Northeast Japan, Kawano et al. 2011) imply t ...
... Southwest Japan, Kawano et al. 2011), suggesting a continuous hydration of the mantle wedge due to upward fluid migration along the subduction interface. In colder environments, comparable fluid and subduction velocities (e.g., approximately 10 cm/year in Northeast Japan, Kawano et al. 2011) imply t ...
The Imbert Formation of northern Hispaniola: a tectono
... 2003). These “sedimentary mélanges” are compatible with the classic principles of stratigraphic superposition, whereas other mélange occurrences in nature do not follow these principles because they are bounded by tectonic contacts. The serpentinite-matrix mélanges typical of subduction channel comp ...
... 2003). These “sedimentary mélanges” are compatible with the classic principles of stratigraphic superposition, whereas other mélange occurrences in nature do not follow these principles because they are bounded by tectonic contacts. The serpentinite-matrix mélanges typical of subduction channel comp ...
Thermal Structure due to Solid-State Flow in the Mantle
... partial melting of subducted sediment and/or basalt is common in present-day subduction zones. The main objection to the conclusion that partial melting of subducted sediment and/or basalt is common comes from the thermal models cited in the first paragraph of this section. This has led to a longsta ...
... partial melting of subducted sediment and/or basalt is common in present-day subduction zones. The main objection to the conclusion that partial melting of subducted sediment and/or basalt is common comes from the thermal models cited in the first paragraph of this section. This has led to a longsta ...
Isostasy, flexure, and dynamic topography
... Moucha and Forte, 2011; Becker et al., 2014). In this term, dynamic refers to moving mass anomalies unlike isostasy that refers to quasi-static mass anomalies. Note, however, that whether or not lithospheric-scale processes, such as small-scale convection in the thermal boundary layer and cooling of ...
... Moucha and Forte, 2011; Becker et al., 2014). In this term, dynamic refers to moving mass anomalies unlike isostasy that refers to quasi-static mass anomalies. Note, however, that whether or not lithospheric-scale processes, such as small-scale convection in the thermal boundary layer and cooling of ...
Indentation of a continent with a built
... when magmas rising from the subducting oceanic plate arc weld the accreted prism of sediments into continental crust in either island or cordilleran arcs (Mitchel and Garson, 1976). Open-ocean subduction may be punctuated by the docking of small terrains with large continents. However, large persist ...
... when magmas rising from the subducting oceanic plate arc weld the accreted prism of sediments into continental crust in either island or cordilleran arcs (Mitchel and Garson, 1976). Open-ocean subduction may be punctuated by the docking of small terrains with large continents. However, large persist ...
Baltica in the Cryogenian, 850–630 Ma
... passive margin deposition throughout the Cryogenian. In the northeast platformal and deeper-water basin deposits are preserved, whereas the eastern region was later affected by Paleozoic rifting and preserves only shelf deposits. The northeastern and eastern regions define Baltica’s Cryogenian north ...
... passive margin deposition throughout the Cryogenian. In the northeast platformal and deeper-water basin deposits are preserved, whereas the eastern region was later affected by Paleozoic rifting and preserves only shelf deposits. The northeastern and eastern regions define Baltica’s Cryogenian north ...