Geology :: 7. Plate interiors
... metamorphic rocks. Between the cratons, there are metamorphosed greenstone belts, which are interpreted as old collision zones. The metamorphic rock masses were intruded by granite plutons. Parts of the cratons are covered by old sedimentary sequences, which – despite their old age – remained unmeta ...
... metamorphic rocks. Between the cratons, there are metamorphosed greenstone belts, which are interpreted as old collision zones. The metamorphic rock masses were intruded by granite plutons. Parts of the cratons are covered by old sedimentary sequences, which – despite their old age – remained unmeta ...
Plate Tectonics
... Plate Tectonics : A Continuous Process We live on the Earth's outermost part, the crust. This layer of solid rock is actually divided into several 'pieces', which we term 'plates', as they seem to 'hold‘ and contain the land or sea above them, just as normal plates carry food. These plates lie abo ...
... Plate Tectonics : A Continuous Process We live on the Earth's outermost part, the crust. This layer of solid rock is actually divided into several 'pieces', which we term 'plates', as they seem to 'hold‘ and contain the land or sea above them, just as normal plates carry food. These plates lie abo ...
Read an excerpt from the book
... sing all the tools available, geologists have now identified most of the terranes that make up North America. The next step is to construct a terrane accretion diagram. The notional continent (Leaflandia) is made up of four superterranes (Oileria, Ottavia, Habsia, and Canuckia). Ottavia and Habsia a ...
... sing all the tools available, geologists have now identified most of the terranes that make up North America. The next step is to construct a terrane accretion diagram. The notional continent (Leaflandia) is made up of four superterranes (Oileria, Ottavia, Habsia, and Canuckia). Ottavia and Habsia a ...
earthquake
... • Scientists don’t yet understand enough about how and where earthquakes will occur to make accurate long-term predictions. • A seismic gap is an area along a fault where there has not been any earthquake activity for a long period of time. ...
... • Scientists don’t yet understand enough about how and where earthquakes will occur to make accurate long-term predictions. • A seismic gap is an area along a fault where there has not been any earthquake activity for a long period of time. ...
Plate tectonics
... • When mantle rocks near the radioactive core are heated, they become less dense than the cooler, upper mantle rocks. These warmer rocks rise while the cooler rocks sink, creating slow, vertical currents within the mantle (these convection currents move mantle rocks only a few centimeters a year). T ...
... • When mantle rocks near the radioactive core are heated, they become less dense than the cooler, upper mantle rocks. These warmer rocks rise while the cooler rocks sink, creating slow, vertical currents within the mantle (these convection currents move mantle rocks only a few centimeters a year). T ...
Earthquakes Study Guide
... Be able to name and describe the 3 types of stresses in the Earth’s crust (tension, compression and shearing) ...
... Be able to name and describe the 3 types of stresses in the Earth’s crust (tension, compression and shearing) ...
6.01 Earth Science Intro - Plate Tectonics - California K
... several layers: a cold, brittle lithosphere, a hot, convecting mantle; and a dense, metallic core. These layers have different densities, compositions and temperatures (energy). Lithospheric plates the size of continents and oceans move at rates of centimeters per year responding to convection curre ...
... several layers: a cold, brittle lithosphere, a hot, convecting mantle; and a dense, metallic core. These layers have different densities, compositions and temperatures (energy). Lithospheric plates the size of continents and oceans move at rates of centimeters per year responding to convection curre ...
Document
... Because seismic waves travel much faster (km/s) than tsunamis, rapid analysis of seismograms can identify earthquakes likely to cause major tsunamis and predict when waves will arrive ...
... Because seismic waves travel much faster (km/s) than tsunamis, rapid analysis of seismograms can identify earthquakes likely to cause major tsunamis and predict when waves will arrive ...
www.kenston.k12.oh.us
... Historical Information The theory of plate tectonics is based upon global observations of earthquakes and volcanoes, which are concentrated in narrow bands on Earth, and rocks and fossils that are very similar, but are now separated by vast distances. It is widely accepted that the surface of the E ...
... Historical Information The theory of plate tectonics is based upon global observations of earthquakes and volcanoes, which are concentrated in narrow bands on Earth, and rocks and fossils that are very similar, but are now separated by vast distances. It is widely accepted that the surface of the E ...
Deep Origin of Hotspots— the Mantle Plume Model
... depths of the mantle carry water down in Hawaii must also be 200 to 300 K hothydrous minerals. The water, when reter than the surrounding mantle to leased by metamorphism, causes already achieve the required large melt frac1000 hot rock material beneath island arcs to tions at depths below the 80-km ...
... depths of the mantle carry water down in Hawaii must also be 200 to 300 K hothydrous minerals. The water, when reter than the surrounding mantle to leased by metamorphism, causes already achieve the required large melt frac1000 hot rock material beneath island arcs to tions at depths below the 80-km ...
Global coupling at 660 km is proposed to explain plate tectonics and
... The presence of low viscosity layers in the mantle is supported by line of geological and geophysical observations. Recent high pressure and temperature investigations indicated that partial carbonate melt should exist at the bottom of the lithosphere and at 660 km. The presence of few percent carbo ...
... The presence of low viscosity layers in the mantle is supported by line of geological and geophysical observations. Recent high pressure and temperature investigations indicated that partial carbonate melt should exist at the bottom of the lithosphere and at 660 km. The presence of few percent carbo ...
earthquake
... • Derived from the amount of displacement (movement) that occurs along the fault zone • Moment magnitude is the most widely used measurement for earthquakes because it is the only magnitude scale that estimates the energy released by earthquakes. ...
... • Derived from the amount of displacement (movement) that occurs along the fault zone • Moment magnitude is the most widely used measurement for earthquakes because it is the only magnitude scale that estimates the energy released by earthquakes. ...
Field Guide Seattle to CRB
... impressions are common here D. Renton Formation: Towards the close of the Eocene, early Oligocene (38-36 Ma), the volcanic activity that produced many of the Tukwila rocks ceased, at least temporarily. The Issaquah area was part of a flat, coastal plain almost at sea level. Over this plain, slow-mov ...
... impressions are common here D. Renton Formation: Towards the close of the Eocene, early Oligocene (38-36 Ma), the volcanic activity that produced many of the Tukwila rocks ceased, at least temporarily. The Issaquah area was part of a flat, coastal plain almost at sea level. Over this plain, slow-mov ...
PowerPoint - Cal State LA - Instructional Web Server
... stripes of normal and reverse polarity at the mid-ocean ridge. ...
... stripes of normal and reverse polarity at the mid-ocean ridge. ...
Chapter 2
... the history and behavior of the plates. Related or supporting concepts: - The sea floor is slowly moving away from the ridge (in both directions) at rates that range from 1–24 cm (0.4–9.4 in) per year but are generally between 2–10 cm (0.8–4 in) per year. The average rate is about 6 cm (2.4 in) per ...
... the history and behavior of the plates. Related or supporting concepts: - The sea floor is slowly moving away from the ridge (in both directions) at rates that range from 1–24 cm (0.4–9.4 in) per year but are generally between 2–10 cm (0.8–4 in) per year. The average rate is about 6 cm (2.4 in) per ...
File
... moving toward each other. One type of convergent boundaries is when continental crust converges and collides with another continental crust. Because continental rocks are too buoyant to be forced into the mantle, the colliding edges of the continents are crumpled and uplifted to form a ...
... moving toward each other. One type of convergent boundaries is when continental crust converges and collides with another continental crust. Because continental rocks are too buoyant to be forced into the mantle, the colliding edges of the continents are crumpled and uplifted to form a ...
Slide 1
... Florida to London than it takes today. That’s because Florida and Europe are riding on two different pieces of Earth’s crust that are moving slowly away from each other! ...
... Florida to London than it takes today. That’s because Florida and Europe are riding on two different pieces of Earth’s crust that are moving slowly away from each other! ...
Physical and chemical controls on habitats for life in the deep
... microbial productivity is unlikely to be limited by confining pressure in any natural environment, because prokaryotic cells have been shown to survive and reproduce at pressures far higher than those encountered in the Earth’s habitable crust [6]. The ultimate constraint on the depth of biological ...
... microbial productivity is unlikely to be limited by confining pressure in any natural environment, because prokaryotic cells have been shown to survive and reproduce at pressures far higher than those encountered in the Earth’s habitable crust [6]. The ultimate constraint on the depth of biological ...
Plate Tectonics 1
... with the Earth’s magnetic field when they cool down. If the Earth’s magnetic field reverses, the crystal magnets stay put -- they are frozen in place. A magnetometer towed behind a boat will pick up a weak field if the crystal magnets point the opposite direction from the Earth’s field. (They partly ...
... with the Earth’s magnetic field when they cool down. If the Earth’s magnetic field reverses, the crystal magnets stay put -- they are frozen in place. A magnetometer towed behind a boat will pick up a weak field if the crystal magnets point the opposite direction from the Earth’s field. (They partly ...
Mantle flow drives the subsidence of oceanic plates - HAL
... regarded as a function of its age only and, therefore, studied along trajectories following an age gradient (referred to as ‘age trajectories’). Several models have been proposed to describe the thermal subsidence of the seafloor with age (1-4), but no consensus has been reached on the origin of the ...
... regarded as a function of its age only and, therefore, studied along trajectories following an age gradient (referred to as ‘age trajectories’). Several models have been proposed to describe the thermal subsidence of the seafloor with age (1-4), but no consensus has been reached on the origin of the ...
Weathering and Erosion Study Guide
... C. Rocks falling on other rocks D. All of the above 2. Which statement best represents weathering? A. B. C. D. ...
... C. Rocks falling on other rocks D. All of the above 2. Which statement best represents weathering? A. B. C. D. ...
A case for drilling the Dufek layered mafic intrusion, Antarctica
... Nd/144Nd = 0.51213 ± 1 – 0.51233 ± 4; and 207Pb/204Pb = 15.544 – 15.873). These ratios can vary both between one mineral type in different rocks and between different mineral types in the same rock. Differences between minerals in the same rock become more pronounced toward the top of the intrusion, ...
... Nd/144Nd = 0.51213 ± 1 – 0.51233 ± 4; and 207Pb/204Pb = 15.544 – 15.873). These ratios can vary both between one mineral type in different rocks and between different mineral types in the same rock. Differences between minerals in the same rock become more pronounced toward the top of the intrusion, ...
PDF - Wiley Online Library
... presence of—in his own words—a sublithospheric sphere of weakness, or asthenosphere, that could accommodate vertical stress variations due to erosion and sedimentation [Barrell, 1914]. The advent of the theory of plate tectonics in the 1960s [e.g., Morgan, 1968] revamped the discussion on the asthen ...
... presence of—in his own words—a sublithospheric sphere of weakness, or asthenosphere, that could accommodate vertical stress variations due to erosion and sedimentation [Barrell, 1914]. The advent of the theory of plate tectonics in the 1960s [e.g., Morgan, 1968] revamped the discussion on the asthen ...
Low-Density Anomalies in the Mantle
... MORB rocks form a trend directed to the recycled component (RC) with lower values of 3He/ 4He (R/Ra = 6–8) and higher values of 87Sr/ 86Sr. Volcanic islands Tristan da Cunha and Gough are located at the end of this trend. The lavas of Samoa also stretch in this direction. The former bear signs of th ...
... MORB rocks form a trend directed to the recycled component (RC) with lower values of 3He/ 4He (R/Ra = 6–8) and higher values of 87Sr/ 86Sr. Volcanic islands Tristan da Cunha and Gough are located at the end of this trend. The lavas of Samoa also stretch in this direction. The former bear signs of th ...
Earthquakes: Movement of the Earth`s Crust
... Earthquakes: Movement of the Earth’s Crust Earthquakes are the shaking and moving of the ground when energy is released in waves. These waves are called seismic waves. These waves are similar to ocean waves, which move through water. Seismic waves, however, move through the ground. Most earthquakes ...
... Earthquakes: Movement of the Earth’s Crust Earthquakes are the shaking and moving of the ground when energy is released in waves. These waves are called seismic waves. These waves are similar to ocean waves, which move through water. Seismic waves, however, move through the ground. Most earthquakes ...
Post-glacial rebound
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Post-glacial rebound (sometimes called continental rebound) is the rise of land masses that were depressed by the huge weight of ice sheets during the last glacial period, through a process known as isostatic depression. Post-glacial rebound and isostatic depression are different parts of a process known as either glacial isostasy, glacial isostatic adjustment, or glacioisostasy. Glacioisostasy is the solid Earth deformation associated with changes in ice mass distribution. The most obvious and direct affects of post-glacial rebound are readily apparent in northern Europe (especially Scotland, Estonia, Latvia, Fennoscandia, and northern Denmark), Siberia, Canada, the Great Lakes of Canada and the United States, the coastal region of the US state of Maine, parts of Patagonia, and Antarctica. However, through processes known as ocean siphoning and continental levering, the effects of post-glacial rebound on sea-level are felt globally far from the locations of current and former ice sheets.