Metamorphic chemical geodynamics of subduction zones
... Fig. 3. P–T diagram showing regions of peak metamorphism and exhumation paths (lines indicating P–T history of rocks during their transit toward the surface) for selected HP and UHP metamorphic suites discussed in the text (see Table 2) and for which data are presented in Figs. 4, 5 and 7 (modified ...
... Fig. 3. P–T diagram showing regions of peak metamorphism and exhumation paths (lines indicating P–T history of rocks during their transit toward the surface) for selected HP and UHP metamorphic suites discussed in the text (see Table 2) and for which data are presented in Figs. 4, 5 and 7 (modified ...
Bebout Metamorphic chemical geodynamics of subduction zones
... Fig. 3. P–T diagram showing regions of peak metamorphism and exhumation paths (lines indicating P–T history of rocks during their transit toward the surface) for selected HP and UHP metamorphic suites discussed in the text (see Table 2) and for which data are presented in Figs. 4, 5 and 7 (modified ...
... Fig. 3. P–T diagram showing regions of peak metamorphism and exhumation paths (lines indicating P–T history of rocks during their transit toward the surface) for selected HP and UHP metamorphic suites discussed in the text (see Table 2) and for which data are presented in Figs. 4, 5 and 7 (modified ...
I. Archaean specificities
... therefore, heat production decreases exponentially. In the Archaean, possibly 2-4 times more heat produced than now. Effects of higher heat production? Two end-members: - “uniform” increase of the heat fluxes: all parts of the Earth are hotter. This can result in hotter intra-plate situations, and m ...
... therefore, heat production decreases exponentially. In the Archaean, possibly 2-4 times more heat produced than now. Effects of higher heat production? Two end-members: - “uniform” increase of the heat fluxes: all parts of the Earth are hotter. This can result in hotter intra-plate situations, and m ...
Numerical modeling of geochemical variations caused by crustal
... starting from 100 C. Colors indicate materials (i.e., rock type or melt), which appear in subsequent figures. To illustrate deformation, two layers with the same physical properties are distinguished using different colors for sediments, crust (upper and lower crust), and mantle (asthenosphere and l ...
... starting from 100 C. Colors indicate materials (i.e., rock type or melt), which appear in subsequent figures. To illustrate deformation, two layers with the same physical properties are distinguished using different colors for sediments, crust (upper and lower crust), and mantle (asthenosphere and l ...
unit 2-tectonic landscapes-flash cards
... EMS Geography GCSE Revision: Question(s) TECTONIC LANDSCAPES Outline the social reasons for people continuing to live in areas prone to earthquake activity. Exam tip: You must know a range of placespecific examples ...
... EMS Geography GCSE Revision: Question(s) TECTONIC LANDSCAPES Outline the social reasons for people continuing to live in areas prone to earthquake activity. Exam tip: You must know a range of placespecific examples ...
Geochemical reservoirs and whole
... they tap the asthenosphere lying directly beneath the plates. In contrast, hotspots or plumes, whether they are stationary of not, are strongly decoupled from plate movements. The common-sense inference is therefore that they are derived from deeper levels. In any case, it should be remembered that ...
... they tap the asthenosphere lying directly beneath the plates. In contrast, hotspots or plumes, whether they are stationary of not, are strongly decoupled from plate movements. The common-sense inference is therefore that they are derived from deeper levels. In any case, it should be remembered that ...
Precambrian Research Geochemical and numerical constraints
... contents of magmas are controlled by garnet stability in the source, which requires high-pressure conditions. The degree of melting exerts relatively little influence, because garnet is generated in the melting process (Moyen and Stevens, 2006). The more melt is produced, the greater proportion of ga ...
... contents of magmas are controlled by garnet stability in the source, which requires high-pressure conditions. The degree of melting exerts relatively little influence, because garnet is generated in the melting process (Moyen and Stevens, 2006). The more melt is produced, the greater proportion of ga ...
SIXTH GRADE PLATE TECTONICS
... One of the first observations used to suggest that the outer portion of the Earth is mobile is the fit of the continents, particularly the west coast of Africa against the east coast of South America. This observation predates plate tectonics. It was first noticed in the 18th century, and proposed b ...
... One of the first observations used to suggest that the outer portion of the Earth is mobile is the fit of the continents, particularly the west coast of Africa against the east coast of South America. This observation predates plate tectonics. It was first noticed in the 18th century, and proposed b ...
Mountain building and mantle dynamics
... of South American upper crust and by intrusion of igneous material, reaching a maximum crustal thickness of ~70 km in the Bolivian orocline [e.g., Beck et al., 1996]. From a kinematic point of view, shortening is related to the westward advancement of South America toward the stationary/slowly retre ...
... of South American upper crust and by intrusion of igneous material, reaching a maximum crustal thickness of ~70 km in the Bolivian orocline [e.g., Beck et al., 1996]. From a kinematic point of view, shortening is related to the westward advancement of South America toward the stationary/slowly retre ...
Mountain building and mantle dynamics
... of South American upper crust and by intrusion of igneous material, reaching a maximum crustal thickness of ~70 km in the Bolivian orocline [e.g., Beck et al., 1996]. From a kinematic point of view, shortening is related to the westward advancement of South America toward the stationary/slowly retre ...
... of South American upper crust and by intrusion of igneous material, reaching a maximum crustal thickness of ~70 km in the Bolivian orocline [e.g., Beck et al., 1996]. From a kinematic point of view, shortening is related to the westward advancement of South America toward the stationary/slowly retre ...
A tide loading driving for plate motion Yongfeng Yang Bureau of
... if there is no vanishing of old crusts, the transferring crusts will pile up in the road. The crowding may block and eventually terminate the transferring. The subduction of Nazca Plate into South American Plate may be a representative of such vanishing, but the majority of the moving plates (like N ...
... if there is no vanishing of old crusts, the transferring crusts will pile up in the road. The crowding may block and eventually terminate the transferring. The subduction of Nazca Plate into South American Plate may be a representative of such vanishing, but the majority of the moving plates (like N ...
Indonesian Landforms and Plate Tectonics
... gradually disappearing. The greatest relief amplitudes occur near the plate boundaries: deep ocean trenches are associated with subduction zones and mountain ranges with collision belts. The landforms of the more stable areas of the plates date back to a more remote past and, where emerged, have a m ...
... gradually disappearing. The greatest relief amplitudes occur near the plate boundaries: deep ocean trenches are associated with subduction zones and mountain ranges with collision belts. The landforms of the more stable areas of the plates date back to a more remote past and, where emerged, have a m ...
The anatomy and ontogeny of modern intra
... wide. Finally, bricks cemented into a wall are inert and immutable, whereas juvenile crust composed of accreted IOASs continues to deform as well as interact with and generate melts long after these are accreted. These melts, continuing deformation, and attendant metamorphism serve as the cement tha ...
... wide. Finally, bricks cemented into a wall are inert and immutable, whereas juvenile crust composed of accreted IOASs continues to deform as well as interact with and generate melts long after these are accreted. These melts, continuing deformation, and attendant metamorphism serve as the cement tha ...
Lecture 10: MORB and OIB petrogenesis
... Adiabatic rise of mantle material with no heat loss – decompression melting ...
... Adiabatic rise of mantle material with no heat loss – decompression melting ...
Tectonics of the Aegean/Anatolian region
... the NAF is almost entirely defined by a series of strike-slip earthquakes. Figure 4 shows a line of earthquakes that define the NAF from its junction with the EAF to its western termination. Focal mechanisms (see figure 3) show predominant strike-slip faulting with most slip vectors aligned approxim ...
... the NAF is almost entirely defined by a series of strike-slip earthquakes. Figure 4 shows a line of earthquakes that define the NAF from its junction with the EAF to its western termination. Focal mechanisms (see figure 3) show predominant strike-slip faulting with most slip vectors aligned approxim ...
a layman`s guide to the geological history of Mount Mee
... Because they are silica-rich, continental rocks are less dense than oceanic crust or the mantle. Hence, even though continents are 30 km or more in thickness, they remain buoyant, supported by the lithosphere below. The colder and denser oceanic lithosphere sinks beneath the buoyant continental lith ...
... Because they are silica-rich, continental rocks are less dense than oceanic crust or the mantle. Hence, even though continents are 30 km or more in thickness, they remain buoyant, supported by the lithosphere below. The colder and denser oceanic lithosphere sinks beneath the buoyant continental lith ...
Ophiolites and Their Origins
... and proposed, based on geochemical interpretations, that Ophiolites are the remnants of ancient oceanic crust the Troodos oceanic crust on Cyprus was a product of and upper mantle that were tectonically emplaced into island arc magmatism. This was a revolutionary but controcontinental margins. They ...
... and proposed, based on geochemical interpretations, that Ophiolites are the remnants of ancient oceanic crust the Troodos oceanic crust on Cyprus was a product of and upper mantle that were tectonically emplaced into island arc magmatism. This was a revolutionary but controcontinental margins. They ...
Answers to STUDY BREAK Questions Essentials 5th Chapter 5
... rivers and streams, or by winds as blowing dust, and dominate the continental margins, abyssal plains, and polar ocean floors. Biogenous sediments, the next most abundant, consist of the hard remains of onceliving marine organisms. The siliceous (silicon-containing) and calcareous (calcium carbonate ...
... rivers and streams, or by winds as blowing dust, and dominate the continental margins, abyssal plains, and polar ocean floors. Biogenous sediments, the next most abundant, consist of the hard remains of onceliving marine organisms. The siliceous (silicon-containing) and calcareous (calcium carbonate ...
Receiver function images of the Hellenic subduction zone and
... Abstract. New combined P receiver functions and seismicity data obtained from the EGELADOS network employing 65 seismological stations within the Aegean constrained new information on the geometry of the Hellenic subduction zone. The dense network and large data set enabled us to estimate the Moho d ...
... Abstract. New combined P receiver functions and seismicity data obtained from the EGELADOS network employing 65 seismological stations within the Aegean constrained new information on the geometry of the Hellenic subduction zone. The dense network and large data set enabled us to estimate the Moho d ...
Driving the Earth machine?
... tion of seismic waves with this material percorrected for adiabatic cooling (the coolcarried up in narrow plumes (4). As a result, turbs the material and further reduces the ing that results from transporting material the asthenosphere is by far the largest, most seismic wave speed (12). Density mea ...
... tion of seismic waves with this material percorrected for adiabatic cooling (the coolcarried up in narrow plumes (4). As a result, turbs the material and further reduces the ing that results from transporting material the asthenosphere is by far the largest, most seismic wave speed (12). Density mea ...
ABSTRAeT RESUMEN
... the boundary separating the volcanically quiescent zone to the north from the SVZ moved 25 km southward. These changes can be related to progressive flattening 01 the angle of subduction of oceanic lithosphere below the northern end of the SVZ. This resulted in 1. an increase in the rate of tectonic ...
... the boundary separating the volcanically quiescent zone to the north from the SVZ moved 25 km southward. These changes can be related to progressive flattening 01 the angle of subduction of oceanic lithosphere below the northern end of the SVZ. This resulted in 1. an increase in the rate of tectonic ...
Driving the Earth machine?
... tion of seismic waves with this material percorrected for adiabatic cooling (the coolcarried up in narrow plumes (4). As a result, turbs the material and further reduces the ing that results from transporting material the asthenosphere is by far the largest, most seismic wave speed (12). Density mea ...
... tion of seismic waves with this material percorrected for adiabatic cooling (the coolcarried up in narrow plumes (4). As a result, turbs the material and further reduces the ing that results from transporting material the asthenosphere is by far the largest, most seismic wave speed (12). Density mea ...
Chapter 5. The Eclogite Engine
... years. In contrast to oceanic crust one can make a case that eroded and delaminated continental material is not stored permanently or long-term or very deep in the mantle; it is re-used and must play an important role in global magmatism and shallow mantle heterogeneity. Sediments, altered oceanic c ...
... years. In contrast to oceanic crust one can make a case that eroded and delaminated continental material is not stored permanently or long-term or very deep in the mantle; it is re-used and must play an important role in global magmatism and shallow mantle heterogeneity. Sediments, altered oceanic c ...
Plate Tectonics - North Coast Distance Education
... A spectacular example of the surface expression of plate movement is dramatically shown in this shaded relief map of Central America collected by astronauts on the Space Shuttle. The map spans a distance of almost 2000 km. A long linear trench lies parallel to the shore and marks the zone where the ...
... A spectacular example of the surface expression of plate movement is dramatically shown in this shaded relief map of Central America collected by astronauts on the Space Shuttle. The map spans a distance of almost 2000 km. A long linear trench lies parallel to the shore and marks the zone where the ...
Divergent Boundaries Undersea mountains forty
... – Seamounts and volcanic islands • Submarine volcanoes are called seamounts – Over a million seamounts exist – Found in all ocean floors but most common in the Pacific – Many form near oceanic ridges or over a hot spot ...
... – Seamounts and volcanic islands • Submarine volcanoes are called seamounts – Over a million seamounts exist – Found in all ocean floors but most common in the Pacific – Many form near oceanic ridges or over a hot spot ...
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.