5A_Plate Tectonics Lecture
... Oceanic - Oceanic Convergence When two oceanic plates converge, one descends beneath the other initiating volcanic activity (similar to the oceanic - continental case), but the volcanoes form on the ocean floor rather than on continents. ...
... Oceanic - Oceanic Convergence When two oceanic plates converge, one descends beneath the other initiating volcanic activity (similar to the oceanic - continental case), but the volcanoes form on the ocean floor rather than on continents. ...
Mantle Flow at a Subduction
... rheology is a composite dislocation-diffusion creep viscosity with a depth-dependent plastic yield stress. Plate boundaries are modeled as low viscosity shear zones. We compare the mantle flow and surface deformation for two end-member slab shapes to observations of shear-wave splitting in the mantl ...
... rheology is a composite dislocation-diffusion creep viscosity with a depth-dependent plastic yield stress. Plate boundaries are modeled as low viscosity shear zones. We compare the mantle flow and surface deformation for two end-member slab shapes to observations of shear-wave splitting in the mantl ...
Document
... During the past decade, it has become recognized that plate bending near a trench before subduction can be associated with significant chemical hydration-linked reactions in cold lithospheric mantle and overlying ocean crust. Bend-faults appear to play a key role by providing high-permeability pathw ...
... During the past decade, it has become recognized that plate bending near a trench before subduction can be associated with significant chemical hydration-linked reactions in cold lithospheric mantle and overlying ocean crust. Bend-faults appear to play a key role by providing high-permeability pathw ...
1. List the 3 main layers of Earth from the most dense to the least
... 17. Draw arrows showing which direction convergent plates move relative to each other. ...
... 17. Draw arrows showing which direction convergent plates move relative to each other. ...
pygplates – a GPlates Python library for data analysis
... When do porphyry copper/gold deposits form? N ...
... When do porphyry copper/gold deposits form? N ...
Plate Tectonics - Johnston County Schools
... Major features: trench, biggest EQs, explosive volcanoes ...
... Major features: trench, biggest EQs, explosive volcanoes ...
Geology Lecture 8 Plate Tectonics and Hotspots
... divergent boundary, thus colder, thus denser) plate under the younger plate, even though they are made of the same rock (basalt) ...
... divergent boundary, thus colder, thus denser) plate under the younger plate, even though they are made of the same rock (basalt) ...
Plate Tectonics
... This newly formed land consists of an arc-shaped chain of small volcanic islands is called a volcanic island arc. ...
... This newly formed land consists of an arc-shaped chain of small volcanic islands is called a volcanic island arc. ...
Plate tectonics and the distribution of volcanoes| sample
... above to move away from each other. The movement causes faults (cracks) in the crust, this weak points are then attacked by the magma forcing its way up from the mantle. As this process continues, it results in magma reaching the surface and cooling, causing the formation of new crust. In the underw ...
... above to move away from each other. The movement causes faults (cracks) in the crust, this weak points are then attacked by the magma forcing its way up from the mantle. As this process continues, it results in magma reaching the surface and cooling, causing the formation of new crust. In the underw ...
Dynamic Earth
... As the crust widens and thins, ____________ form in and around the area, as do ________________. Early in the rift formation, ______________ and ______________ flow into the low valleys and long, narrow ______________ can be created. Eventually, the widening crust along the boundary may become thin ...
... As the crust widens and thins, ____________ form in and around the area, as do ________________. Early in the rift formation, ______________ and ______________ flow into the low valleys and long, narrow ______________ can be created. Eventually, the widening crust along the boundary may become thin ...
Seismic evidence for tearing in the subducting Indian slab beneath
... fracture zones, and seamount chains [Kodaira et al., 2000], the major structures abutting the over-riding plate [Ryan and Scholl, 1993] and large-scale variations in the buoyancy of the subducting plate related to its thermal age [Yáñez and Cembrano, 2004]. Wilson [1965] opined that tearing is inevi ...
... fracture zones, and seamount chains [Kodaira et al., 2000], the major structures abutting the over-riding plate [Ryan and Scholl, 1993] and large-scale variations in the buoyancy of the subducting plate related to its thermal age [Yáñez and Cembrano, 2004]. Wilson [1965] opined that tearing is inevi ...
Science CH 6 Lesson 4
... • During subduction, pieces of rock are scraped off the bottom plate, called accretion. • They accumulate and eventually form mountain chains called accreted terranes. • California’s coastal mountains where formed by accreted terranes. • California’s gold was collected in its rocks this way. ...
... • During subduction, pieces of rock are scraped off the bottom plate, called accretion. • They accumulate and eventually form mountain chains called accreted terranes. • California’s coastal mountains where formed by accreted terranes. • California’s gold was collected in its rocks this way. ...
Quiz 4 material 104
... 1) topography of the ocean floor, 2) age of the ocean floor, 3) heat flow, 4) volcanic activity, and 5) earthquake activity in the ocean floor. To answer this, first read about the contracting earth model on page 77. Each of the patterns are explained in the book beginning on page 80. Do these patte ...
... 1) topography of the ocean floor, 2) age of the ocean floor, 3) heat flow, 4) volcanic activity, and 5) earthquake activity in the ocean floor. To answer this, first read about the contracting earth model on page 77. Each of the patterns are explained in the book beginning on page 80. Do these patte ...
THE EARTH`S LITHOSPHERE
... The crust is not always the same. It is composed of semi-rigid plates that rest or float on a material called “tectonic plates” that can extend up to 80 km depth and divide the lithosphere in giant plates that fit like a puzzle around the globe with small movements every year. ...
... The crust is not always the same. It is composed of semi-rigid plates that rest or float on a material called “tectonic plates” that can extend up to 80 km depth and divide the lithosphere in giant plates that fit like a puzzle around the globe with small movements every year. ...
Provincial Exams - Earth Science (Unit 4)-1
... B. The Pacific plate changed direction. C. The Pacific plate developed a transform fault. D. A divergent plate boundary developed in the Pacific Plate Which of the following were used as evidence to support Continental Drift Theory? ...
... B. The Pacific plate changed direction. C. The Pacific plate developed a transform fault. D. A divergent plate boundary developed in the Pacific Plate Which of the following were used as evidence to support Continental Drift Theory? ...
pdf - University of California, Berkeley
... on their own in the middle of a tectonic plate (think Hawaii or the Galapagos). Not Yellowstone -- it pokes its way to the surface just a few hundred miles from the edge of the North America plate, where a giant trench sends the Juan de Fuca tectonic plate sliding underneath Washington, Oregon, and ...
... on their own in the middle of a tectonic plate (think Hawaii or the Galapagos). Not Yellowstone -- it pokes its way to the surface just a few hundred miles from the edge of the North America plate, where a giant trench sends the Juan de Fuca tectonic plate sliding underneath Washington, Oregon, and ...
Pdf
... The size of the Earth has not changed significantly during the past 600 million years, and very likely not since shortly after its ...
... The size of the Earth has not changed significantly during the past 600 million years, and very likely not since shortly after its ...
Study Guide
... Be able to recognize on a diagram the various parts of Earth: inner core, outer core, mantle, lower mantle, asthenosphere, lithosphere, ...
... Be able to recognize on a diagram the various parts of Earth: inner core, outer core, mantle, lower mantle, asthenosphere, lithosphere, ...
Structure of the Earth Tectonics
... (1). Continents sit atop of tectonic plates What are the plates made of? What is a continent? (2). Plates Consist of mantle and the crust (lithosphere) Plates move atop the asthenosphere (plastic) Continents move because they are embedded into the plates ...
... (1). Continents sit atop of tectonic plates What are the plates made of? What is a continent? (2). Plates Consist of mantle and the crust (lithosphere) Plates move atop the asthenosphere (plastic) Continents move because they are embedded into the plates ...
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.