Plate Tectonics - The Web site cannot be found
... The cycle of oceanic lithosphere begins at mid-ocean ridge (MOR), continues with the thickening, cooling, and moving along the earth’s surface, then subduction and sinking into the mantle, and ends with the decomposition either at the 670km boundary layer between the upper and lower mantle or at the ...
... The cycle of oceanic lithosphere begins at mid-ocean ridge (MOR), continues with the thickening, cooling, and moving along the earth’s surface, then subduction and sinking into the mantle, and ends with the decomposition either at the 670km boundary layer between the upper and lower mantle or at the ...
Orogens and slabs vs. their direction of subduction
... mechanisms with down-dip compression parallel to the slab ŽFrepoli et al., 1996.. This contrasts with a negative buoyancy of the supposed slab pull effect which is invoked also for the detachment of the slab into the mantle: the slab pull should generate extension along the down-dip direction of the ...
... mechanisms with down-dip compression parallel to the slab ŽFrepoli et al., 1996.. This contrasts with a negative buoyancy of the supposed slab pull effect which is invoked also for the detachment of the slab into the mantle: the slab pull should generate extension along the down-dip direction of the ...
Imaging the lithosphere‐asthenosphere boundary
... conductive cooling models, this relatively simple realization of the tectonic plates is not completely understood. Old (>70 Ma) ocean depths are shallower than predicted. Furthermore, precise imaging of the lower boundary of the oceanic lithosphere has proven challenging. Here we directly map the de ...
... conductive cooling models, this relatively simple realization of the tectonic plates is not completely understood. Old (>70 Ma) ocean depths are shallower than predicted. Furthermore, precise imaging of the lower boundary of the oceanic lithosphere has proven challenging. Here we directly map the de ...
Structure and evolution of the northern Oman margin: gravity and
... The obduction process in Oman during Late Cretaceous time, and continental-to-oceanic subduction along the ZagrosMakran region during the Tertiary are consequences of the Arabian-Eurasian collision, resulting in construction of complex structures composed of the Oman ophiolite belt, the Zagros conti ...
... The obduction process in Oman during Late Cretaceous time, and continental-to-oceanic subduction along the ZagrosMakran region during the Tertiary are consequences of the Arabian-Eurasian collision, resulting in construction of complex structures composed of the Oman ophiolite belt, the Zagros conti ...
A continuous plate-tectonic model using geophysical data to
... duced finite margin widths into a global model of plate to be 1 within the plate, and 0 outside the plate. For has a discontinuous transimotions. In particular, we use analytically continuous the standard plate model, (i.e., infinitely differentiable) functions to describe both tion from 1 to 0, whe ...
... duced finite margin widths into a global model of plate to be 1 within the plate, and 0 outside the plate. For has a discontinuous transimotions. In particular, we use analytically continuous the standard plate model, (i.e., infinitely differentiable) functions to describe both tion from 1 to 0, whe ...
S-Velocity Structure of the Upper Mantle
... have been available to test this hypothesis. Here, we use high-resolution seismic images across northern and southern Greece to investigate differences in the subducted crust along the strike of the western Hellenic subduction zone. We deployed 40 broadband seismometers from the IRIS Passcal pool ac ...
... have been available to test this hypothesis. Here, we use high-resolution seismic images across northern and southern Greece to investigate differences in the subducted crust along the strike of the western Hellenic subduction zone. We deployed 40 broadband seismometers from the IRIS Passcal pool ac ...
Review of Late Jurassic-early Miocene sedimentation and plate
... 2008). Scattered sialic igneous activity characterized the Late Triassic margin of California, but most lithologic sections of late Paleozoic-early Mesozoic age are oceanic in their genesis. However, a major Andean-type arc began to form in the Sierra Nevada and Klamath Mountains by *175 Ma attendin ...
... 2008). Scattered sialic igneous activity characterized the Late Triassic margin of California, but most lithologic sections of late Paleozoic-early Mesozoic age are oceanic in their genesis. However, a major Andean-type arc began to form in the Sierra Nevada and Klamath Mountains by *175 Ma attendin ...
petrology of subducted slabs - School of Ocean and Earth Science
... ■ Abstract The subducted lithosphere is composed of a complex pattern of chemical systems that undergo continuous and discontinuous phase transformation, through pressure and temperature variations. Volatile recycling plays a major geodynamic role in triggering mass transfer, melting, and volcanism. ...
... ■ Abstract The subducted lithosphere is composed of a complex pattern of chemical systems that undergo continuous and discontinuous phase transformation, through pressure and temperature variations. Volatile recycling plays a major geodynamic role in triggering mass transfer, melting, and volcanism. ...
Terrigenous Sediments - Lamont
... Petrography studies allow identification of major lithological components in the sand fraction, as well as potentially diagnostic minerals and/or rock types. This approach has been particularly useful for identifying sources of IRD in the ocean. For example, it was the first line of evidence used to ...
... Petrography studies allow identification of major lithological components in the sand fraction, as well as potentially diagnostic minerals and/or rock types. This approach has been particularly useful for identifying sources of IRD in the ocean. For example, it was the first line of evidence used to ...
Plate Tectonics - The Open University
... considerable amount of data in a concerted exposition of his theory, and suggested that during the late Permian all the continents were once assembled into a supercontinent that he named Pangaea, meaning 'all Earth'. He drew maps showing how the continents have since moved to today's positions. He p ...
... considerable amount of data in a concerted exposition of his theory, and suggested that during the late Permian all the continents were once assembled into a supercontinent that he named Pangaea, meaning 'all Earth'. He drew maps showing how the continents have since moved to today's positions. He p ...
Influence of continental roots and asthenosphere on plate
... 5. Discussion and Conclusions [11] We have shown that the rheology of the lower lithosphere and asthenosphere exerts a primary control on the magnitude, but not the direction, of tractions that mantle flow exerts on the Earth’s plates. However, we find that the thickness of the lithospheric layer, a ...
... 5. Discussion and Conclusions [11] We have shown that the rheology of the lower lithosphere and asthenosphere exerts a primary control on the magnitude, but not the direction, of tractions that mantle flow exerts on the Earth’s plates. However, we find that the thickness of the lithospheric layer, a ...
India-Asia collision and the Cenozoic slowdown of the Indian plate
... Figure 2. The plate circuit used to derive the velocity of India relative to Asia shown in Figure 1. The dotted area shows a region of diffuse deformation in the northeast Indian Ocean [e.g., Gordon et al., 1998]. Plate boundaries are from Bird [2003]. Abbreviations are I, India; C, Capricorn; S, So ...
... Figure 2. The plate circuit used to derive the velocity of India relative to Asia shown in Figure 1. The dotted area shows a region of diffuse deformation in the northeast Indian Ocean [e.g., Gordon et al., 1998]. Plate boundaries are from Bird [2003]. Abbreviations are I, India; C, Capricorn; S, So ...
A Geochemical Study of Crustal Plutonic Rocks from the Southern
... Two suites of intermediate-felsic plutonic rocks were recovered by dredges RD63 and RD64 (R/V KK81-06-26) from the northern wall of the Mariana trench near Guam, which is located in the southern part of the Izu-Bonin-Mariana (IBM) island arc system. The locations of the dredges are significant as th ...
... Two suites of intermediate-felsic plutonic rocks were recovered by dredges RD63 and RD64 (R/V KK81-06-26) from the northern wall of the Mariana trench near Guam, which is located in the southern part of the Izu-Bonin-Mariana (IBM) island arc system. The locations of the dredges are significant as th ...
The Yellowstone `hot spot` track results from migrating basin range
... fissures, the two oppositely-propagating time-progressive chains of rhyolitic central volcanoes, and the widespread basaltic volcanism and basin range extension throughout an ~ 800-km-wide province. Models proposed previously fall into three broad classes: 1. A mantle plume; 2. Upper-mantle-convecti ...
... fissures, the two oppositely-propagating time-progressive chains of rhyolitic central volcanoes, and the widespread basaltic volcanism and basin range extension throughout an ~ 800-km-wide province. Models proposed previously fall into three broad classes: 1. A mantle plume; 2. Upper-mantle-convecti ...
Convergence of tectonic reconstructions and mantle - HAL-Insu
... involving changes in ridge length and global tectonic reorganisations. Although independent, both convection models and kinematic reconstructions suggest that changes in ridge length are at least as significant as spreading rate fluctuations in driving changes in the seafloor area-age distribution t ...
... involving changes in ridge length and global tectonic reorganisations. Although independent, both convection models and kinematic reconstructions suggest that changes in ridge length are at least as significant as spreading rate fluctuations in driving changes in the seafloor area-age distribution t ...
Volledig proefschrift
... One explanation for shallow low-angle subduction of young slabs is active motion of the overriding plate towards the subducting plate by some external force, or ‘lithospheric doubling’ (Vlaar, 1983). This process may provide a means to subduct buoyant material and may result in shallow subduction wi ...
... One explanation for shallow low-angle subduction of young slabs is active motion of the overriding plate towards the subducting plate by some external force, or ‘lithospheric doubling’ (Vlaar, 1983). This process may provide a means to subduct buoyant material and may result in shallow subduction wi ...
global tectonic cycles Temporal relations between mineral deposits
... mineral provinces provides fundamental information essential for successful long-term exploration and discovery. Critical data that can be gleaned from regional studies include stratigraphic, structural and tectonic controls and geophysical, geochemical and isotopic data, all of which constrain the ...
... mineral provinces provides fundamental information essential for successful long-term exploration and discovery. Critical data that can be gleaned from regional studies include stratigraphic, structural and tectonic controls and geophysical, geochemical and isotopic data, all of which constrain the ...
Panza-Pontevivo p. 38 - Accademia Nazionale delle Scienze detta
... crust, about 20 km thick in periphery [72, 108], and its thickness reduces progressively to less than 10 km, going towards the basin centre. The central crust, that is younger than 6 Ma and even younger (less than 1.9 Ma) in its eastern part, in correspondence of the Marsili Basin [43, 64], is ocean ...
... crust, about 20 km thick in periphery [72, 108], and its thickness reduces progressively to less than 10 km, going towards the basin centre. The central crust, that is younger than 6 Ma and even younger (less than 1.9 Ma) in its eastern part, in correspondence of the Marsili Basin [43, 64], is ocean ...
Sample
... Essent'l Concept: 2.4 Summarize some of the applications of plate tectonics 25) Mantle plumes are columnar areas of hot molten rock that arise from within the lithosphere. Answer: FALSE Diff: 2 Skill: Comprehension Section: 2.4 Testing the Model: What Are Some Applications of Plate Tectonics? Essent ...
... Essent'l Concept: 2.4 Summarize some of the applications of plate tectonics 25) Mantle plumes are columnar areas of hot molten rock that arise from within the lithosphere. Answer: FALSE Diff: 2 Skill: Comprehension Section: 2.4 Testing the Model: What Are Some Applications of Plate Tectonics? Essent ...
India-Asia collision and the Cenozoic slowdown of the Indian plate
... Figure 2. The plate circuit used to derive the velocity of India relative to Asia shown in Figure 1. The dotted area shows a region of diffuse deformation in the northeast Indian Ocean [e.g., Gordon et al., 1998]. Plate boundaries are from Bird [2003]. Abbreviations are I, India; C, Capricorn; S, So ...
... Figure 2. The plate circuit used to derive the velocity of India relative to Asia shown in Figure 1. The dotted area shows a region of diffuse deformation in the northeast Indian Ocean [e.g., Gordon et al., 1998]. Plate boundaries are from Bird [2003]. Abbreviations are I, India; C, Capricorn; S, So ...
Evolution of the Kurile-Kamchatkan Volcanic Arcs and Dynamics of
... The Cenozoic tectonic evolution of the Kurile-Kamchatkan arc system has been reconstructed based on the spatial-tectonic setting of the volcanic-rock formations and their petrologic-geochemical characteristics, using gravity and seismic data. Three volcanic arc trench systems of different ages that ...
... The Cenozoic tectonic evolution of the Kurile-Kamchatkan arc system has been reconstructed based on the spatial-tectonic setting of the volcanic-rock formations and their petrologic-geochemical characteristics, using gravity and seismic data. Three volcanic arc trench systems of different ages that ...
Temporal relations between mineral deposits and global tectonic
... mineral provinces provides fundamental information essential for successful long-term exploration and discovery. Critical data that can be gleaned from regional studies include stratigraphic, structural and tectonic controls and geophysical, geochemical and isotopic data, all of which constrain the ...
... mineral provinces provides fundamental information essential for successful long-term exploration and discovery. Critical data that can be gleaned from regional studies include stratigraphic, structural and tectonic controls and geophysical, geochemical and isotopic data, all of which constrain the ...
- White Rose Research Online
... The latest major tectonic events in the late Cenozoic geologic evolution of Anatolia are the development of the North Anatolian fault, the East Anatolian fault and the Dead Sea fault. The resulting northward relative differential plate motion between Arabia and Africa has accelerated the convergence ...
... The latest major tectonic events in the late Cenozoic geologic evolution of Anatolia are the development of the North Anatolian fault, the East Anatolian fault and the Dead Sea fault. The resulting northward relative differential plate motion between Arabia and Africa has accelerated the convergence ...
The lithosphere under stress
... for the entropy change on melting: use of a higher value causes a decrease in the calculated amount of melt generated from mantle at a given temperature. In the original calculations they also allowed the mantle to decompress to the surface, and thus to continue generating melt: restricting the shal ...
... for the entropy change on melting: use of a higher value causes a decrease in the calculated amount of melt generated from mantle at a given temperature. In the original calculations they also allowed the mantle to decompress to the surface, and thus to continue generating melt: restricting the shal ...
Oceanic trench
The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor. Oceanic trenches are a distinctive morphological feature of convergent plate boundaries, along which lithospheric plates move towards each other at rates that vary from a few mm to over ten cm per year. A trench marks the position at which the flexed, subducting slab begins to descend beneath another lithospheric slab. Trenches are generally parallel to a volcanic island arc, and about 200 km (120 mi) from a volcanic arc. Oceanic trenches typically extend 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor. The greatest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench, at a depth of 11,034 m (36,201 ft) below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km2/yr.