Subduction - Géosciences Montpellier
... is the effect of a collision like the Ontong Java Plateau with the Solomon trench that impacts the stress field over a huge area from New Guinea to New Hebrides (Mann and Taira, 2004). ...
... is the effect of a collision like the Ontong Java Plateau with the Solomon trench that impacts the stress field over a huge area from New Guinea to New Hebrides (Mann and Taira, 2004). ...
Numerical modeling
... discontinuity. Non-penetration is favored by (i) low convergence rate, (ii) faster relative movement of the overriding plate, (iii) young age of the subducting slab and (iv) up-side-down turn-over of detached slab. © 2008 Elsevier B.V. All rights reserved. ...
... discontinuity. Non-penetration is favored by (i) low convergence rate, (ii) faster relative movement of the overriding plate, (iii) young age of the subducting slab and (iv) up-side-down turn-over of detached slab. © 2008 Elsevier B.V. All rights reserved. ...
Zoned mantle convection
... as a major hindrance to whole-mantle convection on the basis that very few earthquakes seemed to originate from below this depth and, therefore, that lithospheric plates do not penetrate it. An additional justi cation of layering at this depth was that subtracting the inventory of incompatible elem ...
... as a major hindrance to whole-mantle convection on the basis that very few earthquakes seemed to originate from below this depth and, therefore, that lithospheric plates do not penetrate it. An additional justi cation of layering at this depth was that subtracting the inventory of incompatible elem ...
Delamination, Slab Break-Off, and Slab Roll-Back
... • Lithotectonic belt relationships • Mechanical properties of the crust and lithospheric mantle • Basis for series of lithospheric-scale cross sections showing collisional delamination ...
... • Lithotectonic belt relationships • Mechanical properties of the crust and lithospheric mantle • Basis for series of lithospheric-scale cross sections showing collisional delamination ...
The Farallon-Aluk ridge collision with South America: Implications
... active plates transform margins, it can be stated that once the collision of a divergent ridge enables the coupling of the divergent ocean-floor to the continental crust through a transform fault, then the subducted plate detaches (or unzips), leaving a slab window behind. This new situation should r ...
... active plates transform margins, it can be stated that once the collision of a divergent ridge enables the coupling of the divergent ocean-floor to the continental crust through a transform fault, then the subducted plate detaches (or unzips), leaving a slab window behind. This new situation should r ...
Lithospheric structure of the Rio Grande rift
... lithospheric thinning and upwelling mantle are the same for distributed versus concentrated deformation scenarios, the observed lateral distribution of lithospheric deformation over a region that is approximately four times the width of the rift’s surface expression may have resulted in less concent ...
... lithospheric thinning and upwelling mantle are the same for distributed versus concentrated deformation scenarios, the observed lateral distribution of lithospheric deformation over a region that is approximately four times the width of the rift’s surface expression may have resulted in less concent ...
The heavy noble gas composition of the depleted MORB mantle
... To characterize the heavy noble gas composition of MORBs we present new He, Ne, Ar, and Xe abundances and isotopic compositions from the equatorial Mid-Atlantic Ridge. Both depleted MORBs nominally devoid of plume influence and more enriched MORBs thought to represent the influence of a HIMU mantle pl ...
... To characterize the heavy noble gas composition of MORBs we present new He, Ne, Ar, and Xe abundances and isotopic compositions from the equatorial Mid-Atlantic Ridge. Both depleted MORBs nominally devoid of plume influence and more enriched MORBs thought to represent the influence of a HIMU mantle pl ...
Chapter F4
... Section 1 Inside the Earth Section 2 Restless Continents Section 3 The Theory of Plate Tectonics ...
... Section 1 Inside the Earth Section 2 Restless Continents Section 3 The Theory of Plate Tectonics ...
Campbell, I.H., Large Igneous Provinces and the mantle plume
... KEYWORDS: mantle plume, large igneous ...
... KEYWORDS: mantle plume, large igneous ...
- Wiley Online Library
... the styles of continental lithosphere deformation during mature collision where 1800 km of convergence has been accommodated by horizontal shortening. We conducted a suite of numerical geodynamic experiments that test the sensitivity of mature continent collision to varying mantle lithosphere densi ...
... the styles of continental lithosphere deformation during mature collision where 1800 km of convergence has been accommodated by horizontal shortening. We conducted a suite of numerical geodynamic experiments that test the sensitivity of mature continent collision to varying mantle lithosphere densi ...
Cascadia subducting plate fluids channelled to fore
... released. Although the breakdown temperatures and pressures are quite well known from laboratory studies, metastability and slow release mean that the depth of fluid release is not accurately known. The water production rate from the crust has been estimated to be about 0.1 mm/yr from these sources, ...
... released. Although the breakdown temperatures and pressures are quite well known from laboratory studies, metastability and slow release mean that the depth of fluid release is not accurately known. The water production rate from the crust has been estimated to be about 0.1 mm/yr from these sources, ...
Tectonic and volcanic events at the Jan Mayen Ridge
... whereas the western flank of the ridge is downfaulted towards the Jan Mayen Basin. These faults form a listric fault complex in which individual faults can be seen to sole-out at depth. The ridges comprising the southern ridge complex (Pelton 1985) are also tilted fault blocks. The majority of the b ...
... whereas the western flank of the ridge is downfaulted towards the Jan Mayen Basin. These faults form a listric fault complex in which individual faults can be seen to sole-out at depth. The ridges comprising the southern ridge complex (Pelton 1985) are also tilted fault blocks. The majority of the b ...
Insight into collision zone dynamics from topography
... Crustal shortening and thickening at collision zones produces topographic signals, via isostasy, in addition to those caused by mantle processes. The transformation of a subduction zone to a fully formed collision zone is thought to be categorised by two important events: initial collision of the co ...
... Crustal shortening and thickening at collision zones produces topographic signals, via isostasy, in addition to those caused by mantle processes. The transformation of a subduction zone to a fully formed collision zone is thought to be categorised by two important events: initial collision of the co ...
Analogue modelling of continental collision: Influence of plate
... stemming from the advancing wall and convection related drag at the base of the lithosphere is neglected. We assume that the use of one moving wall instead of two has no significant effect on the deformation pattern, and whether the upper plate or the lower plate borders the moving wall should not in ...
... stemming from the advancing wall and convection related drag at the base of the lithosphere is neglected. We assume that the use of one moving wall instead of two has no significant effect on the deformation pattern, and whether the upper plate or the lower plate borders the moving wall should not in ...
Chapter 1- INTRODUCTION 1.1. Mantle Rocks This study is
... resolved, ranges from 200 to perhaps 400 km deep beneath the oldest continents known as cratons. Under younger continental regions or where old continents have suffered important tectonomagmatic activity, the thickness of the lithosphere generally reaches lesser depths than in cratonic areas, in som ...
... resolved, ranges from 200 to perhaps 400 km deep beneath the oldest continents known as cratons. Under younger continental regions or where old continents have suffered important tectonomagmatic activity, the thickness of the lithosphere generally reaches lesser depths than in cratonic areas, in som ...
The Armenian earthquake of 1988 December 7: faulting and folding
... scarp or a dextral pressure ridge (Fig. 4) according to the thickness of the soft sediment cover or soil. The first subsegment ends at about 2 km west from the Yerevan road at the intersection with an irrigation channel. Before the crossing with the duct, the direction of the fault changes to N050" ...
... scarp or a dextral pressure ridge (Fig. 4) according to the thickness of the soft sediment cover or soil. The first subsegment ends at about 2 km west from the Yerevan road at the intersection with an irrigation channel. Before the crossing with the duct, the direction of the fault changes to N050" ...
Pacific plate slab pull and intraplate deformation in the
... critical value (known as the von Mises yield criterion) yielding of the plate will occur (possibly expressed through volcanism in the geological record). This “likelihood” for a plate to fracture increases if an area of high σe values has preexisting weakness or is under stress from some other mecha ...
... critical value (known as the von Mises yield criterion) yielding of the plate will occur (possibly expressed through volcanism in the geological record). This “likelihood” for a plate to fracture increases if an area of high σe values has preexisting weakness or is under stress from some other mecha ...
G. Heinson, Electromagnetic studies of the lithosphere and
... To obtain velocity anomalies of 5%, an associated thermal anomaly of several hundred degrees is required, with slower velocities in hotter mantle (Lay and Wallace, 1995). The presence of partial melt will reduce the shear-wave rigiditymodulus further. Localised temperature perturbations are likely t ...
... To obtain velocity anomalies of 5%, an associated thermal anomaly of several hundred degrees is required, with slower velocities in hotter mantle (Lay and Wallace, 1995). The presence of partial melt will reduce the shear-wave rigiditymodulus further. Localised temperature perturbations are likely t ...
The evolution of the martian elastic lithosphere and implications for
... Estimates of the martian elastic lithosphere thickness imply that Te evolved from values around 20 km in the Noachian (McGovern et al., 2004; Grott et al., 2005, 2007; Kronberg et al., 2007) to around 70 km in the Amazonian period (McGovern et al., 2004; Belleguic et al., 2005) and this general tren ...
... Estimates of the martian elastic lithosphere thickness imply that Te evolved from values around 20 km in the Noachian (McGovern et al., 2004; Grott et al., 2005, 2007; Kronberg et al., 2007) to around 70 km in the Amazonian period (McGovern et al., 2004; Belleguic et al., 2005) and this general tren ...
PACRIM 2015 Congress, Hong Kong, China, 18
... Resources Inc. in NW Ecuador. The deposit lies within the Cascabel exploration concession, 48 km northnorth-west (NNW) of Ibarra in Imbabura Province. The first company to explore the region was Santa Barbara Copper and Gold S.A. in 2008, when stream silt surveys and prospecting identified widesprea ...
... Resources Inc. in NW Ecuador. The deposit lies within the Cascabel exploration concession, 48 km northnorth-west (NNW) of Ibarra in Imbabura Province. The first company to explore the region was Santa Barbara Copper and Gold S.A. in 2008, when stream silt surveys and prospecting identified widesprea ...
- Wiley Online Library
... Subandean fold-and-thrust belt [after Hindle et al., 2002]. where seismicity associated with thrust faulting is active today (Figure 1 [Suarez et al., 1983]). Modeling the twostage uplift of the Andes using a viscoplastic model, Wdowinski and Bock [1994a, 1994b] have shown that the broad uplift of A ...
... Subandean fold-and-thrust belt [after Hindle et al., 2002]. where seismicity associated with thrust faulting is active today (Figure 1 [Suarez et al., 1983]). Modeling the twostage uplift of the Andes using a viscoplastic model, Wdowinski and Bock [1994a, 1994b] have shown that the broad uplift of A ...
Where and why do large shallow intraslab earthquakes occur?
... are used. We judge whether they occurred within a slab or not mainly based on their focal mechanisms, making references to relative plate motions and focal mechanisms of nearby smaller events, and depths. We use depths from individual studies if available; if not, we use Harvard centroid depths that ...
... are used. We judge whether they occurred within a slab or not mainly based on their focal mechanisms, making references to relative plate motions and focal mechanisms of nearby smaller events, and depths. We use depths from individual studies if available; if not, we use Harvard centroid depths that ...
Geological features and geophysical signatures of continental
... continental breakups in early stages of eastern Gondwana splitting. At a later stage during the midCretaceous age (about 90 million years ago) Madagascar and at Cretaceous-Tertiary boundary (about 65 million years ago) Seychelles micro-continent have splintered and rifted away from the western side ...
... continental breakups in early stages of eastern Gondwana splitting. At a later stage during the midCretaceous age (about 90 million years ago) Madagascar and at Cretaceous-Tertiary boundary (about 65 million years ago) Seychelles micro-continent have splintered and rifted away from the western side ...
Geology
Geology (from the Greek γῆ, gē, i.e. ""earth"" and -λoγία, -logia, i.e. ""study of, discourse"") is an earth science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which they change. Geology can also refer generally to the study of the solid features of any celestial body (such as the geology of the Moon or Mars).Geology gives insight into the history of the Earth by providing the primary evidence for plate tectonics, the evolutionary history of life, and past climates. Geology is important for mineral and hydrocarbon exploration and exploitation, evaluating water resources, understanding of natural hazards, the remediation of environmental problems, and for providing insights into past climate change. Geology also plays a role in geotechnical engineering and is a major academic discipline.