Plate Tectonics: GL209 Prof. John Tarney Lecture 5: Subduction
... These are characteristic of very primitive oceanic island arcs, and are not usually erupted on continents or in the later stages of arc development. IAT have similarities with mid-ocean ridge basalts (MORB), in having depleted rare-earth element (REE) patterns, but are usually more Fe-rich and with ...
... These are characteristic of very primitive oceanic island arcs, and are not usually erupted on continents or in the later stages of arc development. IAT have similarities with mid-ocean ridge basalts (MORB), in having depleted rare-earth element (REE) patterns, but are usually more Fe-rich and with ...
JDFfaulting
... embrittlement is an important mechanism for triggering intermediate-depth earthquakes ...
... embrittlement is an important mechanism for triggering intermediate-depth earthquakes ...
Insight into collision zone dynamics from topography
... collision zone (Lei and Zhao, 2007), which shows low velocity regions where the slab would be expected. These low velocity regions can be interpreted as areas where the slab is no longer present and has been replaced by hot mantle material. Neo-Tethys opened in the Permian (Şengör et al., 1988) ma ...
... collision zone (Lei and Zhao, 2007), which shows low velocity regions where the slab would be expected. These low velocity regions can be interpreted as areas where the slab is no longer present and has been replaced by hot mantle material. Neo-Tethys opened in the Permian (Şengör et al., 1988) ma ...
Redalyc.Long-term evolution of subduction zones and the
... 1969; Atwater, 1970, 1989). The magmatism covers a zone more than 1000 km wide. An eastward shift of igneous activity (Lindgren, 1915) took place during Late Mesozoic to Early Cenozoic times (Lipman et al., 1971; Snyder et al., 1976). These features were interpreted in terms of two subparallel subdu ...
... 1969; Atwater, 1970, 1989). The magmatism covers a zone more than 1000 km wide. An eastward shift of igneous activity (Lindgren, 1915) took place during Late Mesozoic to Early Cenozoic times (Lipman et al., 1971; Snyder et al., 1976). These features were interpreted in terms of two subparallel subdu ...
occurrence of the ocean and its evolution toward an
... basaltic magmas erupting along the fault systems engendered flood basalt occurrences, which may extend over large areas, like those from Deccan that occupy one-third of the Indian territory (Hatch et al., 1961), or the Karroo basalt complex in South Africa, which extends over an area of up to 5,000 ...
... basaltic magmas erupting along the fault systems engendered flood basalt occurrences, which may extend over large areas, like those from Deccan that occupy one-third of the Indian territory (Hatch et al., 1961), or the Karroo basalt complex in South Africa, which extends over an area of up to 5,000 ...
Episodic Tremor and Slip
... the GPS unit measured a short-term reversal in the direction of plate motion at this geographical location, representing slow slip on the boundary E The tremor activity, although seen throughout each year, spikes at regular intervals. F.F Each episode of slip occurs at the between the plates. E. sam ...
... the GPS unit measured a short-term reversal in the direction of plate motion at this geographical location, representing slow slip on the boundary E The tremor activity, although seen throughout each year, spikes at regular intervals. F.F Each episode of slip occurs at the between the plates. E. sam ...
Negredo et al. Pamir subduction, EPSL, 259, 2007
... oceanic crust in the region since at least the Late Cretaceous (e.g. Burtman and Molnar, 1993; Hildebrand et al., 2001; Guillot et al., 2003). Concerning the location and timing of initiation of present-day Indian continental subduction beneath the Hindu Kush, a first scenario consists of assuming t ...
... oceanic crust in the region since at least the Late Cretaceous (e.g. Burtman and Molnar, 1993; Hildebrand et al., 2001; Guillot et al., 2003). Concerning the location and timing of initiation of present-day Indian continental subduction beneath the Hindu Kush, a first scenario consists of assuming t ...
the palaeozoic sedimentary rocks of peninsular malaysia
... Originally the nue •Kubang pasu formation• was used to refer to a sequence of red and grey Upper Palaeozoic rocks cropping out in central and south Perlis and north Kedah. Ti\ey are the stratigraphic equivalent of lithologically siad.lar, red and grey to black rocks occurring in north Perl1s and Lan ...
... Originally the nue •Kubang pasu formation• was used to refer to a sequence of red and grey Upper Palaeozoic rocks cropping out in central and south Perlis and north Kedah. Ti\ey are the stratigraphic equivalent of lithologically siad.lar, red and grey to black rocks occurring in north Perl1s and Lan ...
Constraints on shallow mantle viscosity from morphology and
... values. Since the lithosphere is close to 10 km thick off axis and the diking interval is 10 yrs in our model, Vmax is set to be 104 m2. We choose the full thickness of lithosphere rather than the smallest at the spreading center because significant pressure drop can occur as deep as at the bottom o ...
... values. Since the lithosphere is close to 10 km thick off axis and the diking interval is 10 yrs in our model, Vmax is set to be 104 m2. We choose the full thickness of lithosphere rather than the smallest at the spreading center because significant pressure drop can occur as deep as at the bottom o ...
Density structure and geometry of the Costa Rican subduction zone
... the model parameters and on the observations– are independent and the theoretical relationship can be understood as a conditional density function, a complete, probabilistic solution can be expressed as an a posteriori density function (PDF) (Tarantola and Valette, 1982). The final hypocenter locati ...
... the model parameters and on the observations– are independent and the theoretical relationship can be understood as a conditional density function, a complete, probabilistic solution can be expressed as an a posteriori density function (PDF) (Tarantola and Valette, 1982). The final hypocenter locati ...
A Three-Dimensional Model of the Lithosphere Dynamics
... mentary cover and provided more detailed constraints on the Moho topography within the basin. Also confirmed were anomalously low velocities in the thick sedimentary sequence, indicating its large porosity despite the high pressures and temperatures at depths of 15–20 km. Two lower-velocity layers h ...
... mentary cover and provided more detailed constraints on the Moho topography within the basin. Also confirmed were anomalously low velocities in the thick sedimentary sequence, indicating its large porosity despite the high pressures and temperatures at depths of 15–20 km. Two lower-velocity layers h ...
E ects of Lithospheric Strength on Convection in the Earth`s Mantle
... Convection in Earth's mantle is driven largely by horizontal density gradients that form when cold, dense, mantle lithosphere descends into the mantle interior, either through subduction for plate-scale ow, or as localized convective instability beneath lithospheric plates. The deformation associat ...
... Convection in Earth's mantle is driven largely by horizontal density gradients that form when cold, dense, mantle lithosphere descends into the mantle interior, either through subduction for plate-scale ow, or as localized convective instability beneath lithospheric plates. The deformation associat ...
(2016). A joint local and teleseismic tomography study of
... region surrounding the NMSZ. Interpretations of potential field data and active source reconnaissance seismic refraction and reflection experiments suggest significant crustal heterogeneity beneath the embayment related to a long and complex geological history of rifting, uplift, and subsidence [Mooney ...
... region surrounding the NMSZ. Interpretations of potential field data and active source reconnaissance seismic refraction and reflection experiments suggest significant crustal heterogeneity beneath the embayment related to a long and complex geological history of rifting, uplift, and subsidence [Mooney ...
Tsunami threat to coastal areas of Sabah, East Malaysia
... along most coastal areas of east Sabah will, however, result in insignificant run-ups (<0.5 m) of these distant tsunami, though the narrow continental shelf fronting the coastal areas of the Dent and Semporna Peninsulas may lead to locally significant run-ups (>0.5 m high). Tsunami that have occurre ...
... along most coastal areas of east Sabah will, however, result in insignificant run-ups (<0.5 m) of these distant tsunami, though the narrow continental shelf fronting the coastal areas of the Dent and Semporna Peninsulas may lead to locally significant run-ups (>0.5 m high). Tsunami that have occurre ...
PLATE TECTONICS: Lecture 5
... agreement on the balance of forces that drives plate tectonics, the "slab-pull" force is thought to be an important one. For instance the Pacific Plate is the fastest moving plate (ca. 10 cm/yr), and this is the plate that supplies most of the Earth's subducting lithosphere, and thus where the overa ...
... agreement on the balance of forces that drives plate tectonics, the "slab-pull" force is thought to be an important one. For instance the Pacific Plate is the fastest moving plate (ca. 10 cm/yr), and this is the plate that supplies most of the Earth's subducting lithosphere, and thus where the overa ...
univERsity oF copEnhAGEn
... Iceland, although Caledonian and older ages have been reported for the recycled crust (Korenaga and Kelemen, 2000). One of two major positive geoid anomalies on Earth (+60 m) peaks over Iceland. The positive free air gravity values and the elevated surface topography indicate significant dynamic sup ...
... Iceland, although Caledonian and older ages have been reported for the recycled crust (Korenaga and Kelemen, 2000). One of two major positive geoid anomalies on Earth (+60 m) peaks over Iceland. The positive free air gravity values and the elevated surface topography indicate significant dynamic sup ...
Structural setting of the neo archean terrains in the - HAL
... described are the vertical shear zones (Stüwe and Oliver, 1981; Kleinschmidt and Talarico, 2000; Monnier, 1995; Pelletier, 2001) that are commonly considered as strike-slip limits of assembled terranes (Ménot et al., 1995; Monnier et al., 1996; Ménot et al., 1999). In Port Martin area, such shear zo ...
... described are the vertical shear zones (Stüwe and Oliver, 1981; Kleinschmidt and Talarico, 2000; Monnier, 1995; Pelletier, 2001) that are commonly considered as strike-slip limits of assembled terranes (Ménot et al., 1995; Monnier et al., 1996; Ménot et al., 1999). In Port Martin area, such shear zo ...
Asthenospheric flow and origin of volcanism in the Baikal Rift area
... 0012-821X/$ - see front matter © 2006 Elsevier B.V. All rights reserved. doi:10.1016/j.epsl.2006.07.007 ...
... 0012-821X/$ - see front matter © 2006 Elsevier B.V. All rights reserved. doi:10.1016/j.epsl.2006.07.007 ...
Geology
... 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 ...
The Moho beneath western Tibet: Shear zones and eclogitization in
... with faults observed at the surface, the equivalent structures in the lower crust would be ductile shear zones active during past deformation episodes but not necessarily indicating localization of present-day deformation rates. We note that the radius of the Fresnel zone for wavelengths of ∼5 km at ...
... with faults observed at the surface, the equivalent structures in the lower crust would be ductile shear zones active during past deformation episodes but not necessarily indicating localization of present-day deformation rates. We note that the radius of the Fresnel zone for wavelengths of ∼5 km at ...
12. Interpretation of Multichannel Seismic Reflection Data, Legs 56
... Figure 1. Map of northeastern Japan in the area of the Japan Trench Transect, showing the location of multichannel seismic reflection records andDSDP drill sites. (Records 1, 2, and A were acquired by JNOC; Records 3 and 4 were acquired by ORI [Nasu and others, 1979]; Record P-894 was acquired by Sh ...
... Figure 1. Map of northeastern Japan in the area of the Japan Trench Transect, showing the location of multichannel seismic reflection records andDSDP drill sites. (Records 1, 2, and A were acquired by JNOC; Records 3 and 4 were acquired by ORI [Nasu and others, 1979]; Record P-894 was acquired by Sh ...
Earthquake Depth-Energy Release: Thermomechanical Implications
... isobaric shearing at fractally-distributed depths likely facilitates toroidal plate rotations while minimizing ...
... isobaric shearing at fractally-distributed depths likely facilitates toroidal plate rotations while minimizing ...
Distributed deformation in the lower crust and upper mantle beneath
... amplitude and depth of ;34 km. Across the two faults, converted energy from 16–20 km depth varies with back-azimuth in a manner suggesting the presence of anisotropy in the lower crust. These observations imply that one of the tenets of plate tectonics, that faults defining plate boundaries pass thr ...
... amplitude and depth of ;34 km. Across the two faults, converted energy from 16–20 km depth varies with back-azimuth in a manner suggesting the presence of anisotropy in the lower crust. These observations imply that one of the tenets of plate tectonics, that faults defining plate boundaries pass thr ...
Geofizikai közlemények - 45. köt. 4. sz. (2011. december)
... Based on the both, the seismic and the gravity modelling, two types of crust can be defined: the Dinaridic and the Pannonian (Fig. 4). The Dinaridic crust is comprised of two parts, the lower and the upper crust, whereas the Pannonian crust is virtually unified. The Dinaridic upper crust is characte ...
... Based on the both, the seismic and the gravity modelling, two types of crust can be defined: the Dinaridic and the Pannonian (Fig. 4). The Dinaridic crust is comprised of two parts, the lower and the upper crust, whereas the Pannonian crust is virtually unified. The Dinaridic upper crust is characte ...
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 ...