Lecture 6: Igneous classification, mid-ocean ridges
... – Initiation of continental margin subduction with trench in today’s western Sierra foothills (Triassic-Jurassic); – Interruption of subduction by Late Jurassic Nevadan orogeny (accretion of another island arc terrane), initiation of mature Andean trench-gap-arc system at Franciscan-Great Valley-Sie ...
... – Initiation of continental margin subduction with trench in today’s western Sierra foothills (Triassic-Jurassic); – Interruption of subduction by Late Jurassic Nevadan orogeny (accretion of another island arc terrane), initiation of mature Andean trench-gap-arc system at Franciscan-Great Valley-Sie ...
Plate Tectonics – The Lecture Notes
... a) Continental Rocks date the Earth at about 5 billion years old. Since the ocean floor is lower in the lithosphere, scientists expected to find older rocks at those depths. Continental geology’s law of Superposition states that oldest rocks are laid down first and should be found horizontally lowes ...
... a) Continental Rocks date the Earth at about 5 billion years old. Since the ocean floor is lower in the lithosphere, scientists expected to find older rocks at those depths. Continental geology’s law of Superposition states that oldest rocks are laid down first and should be found horizontally lowes ...
Lecture 18.
... cooler, denser crust slips beneath less dense crust; strong quakes, deep trench forms in arc shape; subducted plate heats in upper mantle; magma rises to form curving chains of volcanic islands. Deep marine trenches are typically associated with subduction zones, and the basins that develop along th ...
... cooler, denser crust slips beneath less dense crust; strong quakes, deep trench forms in arc shape; subducted plate heats in upper mantle; magma rises to form curving chains of volcanic islands. Deep marine trenches are typically associated with subduction zones, and the basins that develop along th ...
Plate Tectonics Lecture Notes Page
... 3. Pacific Ring of Fire (1935-1940): Earthquakes & volcanoes in Pacific associated with C. Drift Pacific Basin: Zone of frequent earthquakes & volcanic eruptions, oceanic trenches Patterns of 10,000 earthquakes = Earth is divided into sectionsEcho Soundings revealed a submerged, mid-oceanic mountain ...
... 3. Pacific Ring of Fire (1935-1940): Earthquakes & volcanoes in Pacific associated with C. Drift Pacific Basin: Zone of frequent earthquakes & volcanic eruptions, oceanic trenches Patterns of 10,000 earthquakes = Earth is divided into sectionsEcho Soundings revealed a submerged, mid-oceanic mountain ...
Pachamama Geography Consultants
... from MT. Rainer National Park. Sections of the town are composed of solidified mud flows that originated on Mt.Ranier. ...
... from MT. Rainer National Park. Sections of the town are composed of solidified mud flows that originated on Mt.Ranier. ...
Lecture Chapter 7 Part 2
... Normal (+) and reversed (-) magnetization of the seafloor about the mid-ocean ridge. Note the symmetry on either side of the ridge. ...
... Normal (+) and reversed (-) magnetization of the seafloor about the mid-ocean ridge. Note the symmetry on either side of the ridge. ...
Plate Boundary
... A couple of cinder cones and a lava flow in New Mexico •This type of volcanic cone is often found associated with other volcanoes, and commonly where plates have been completely subducted and the melted material is in its last gasps. ...
... A couple of cinder cones and a lava flow in New Mexico •This type of volcanic cone is often found associated with other volcanoes, and commonly where plates have been completely subducted and the melted material is in its last gasps. ...
Seafloor Spreading
... 2. The magma erupts as lava and forms new seafloor. Magnetic polarity is set when rock cools. 3. The newly-formed rock is pushed away from the ridge axis as more lava erupts. 4. If the oceanic crust reaches a deep sea trench, it sinks into the trench and is lost into the mantle. ...
... 2. The magma erupts as lava and forms new seafloor. Magnetic polarity is set when rock cools. 3. The newly-formed rock is pushed away from the ridge axis as more lava erupts. 4. If the oceanic crust reaches a deep sea trench, it sinks into the trench and is lost into the mantle. ...
Plate Tectonics Revolution: how it came about
... The evidence for continental drift was compelling and well established during the first half of the 20th Century but it was not accepted by many geologists (almost all U.S. geologists) until the advent of plate tectonics in the late 1960’s-early 1970’s! ...
... The evidence for continental drift was compelling and well established during the first half of the 20th Century but it was not accepted by many geologists (almost all U.S. geologists) until the advent of plate tectonics in the late 1960’s-early 1970’s! ...
Plate Tectonics 1
... • Currently, the Pacific Ocean basin is shrinking as other ocean basins expand. • Seismicity is the frequency, magnitude and distribution of earthquakes. Earthquakes are concentrated along oceanic ridges, transform faults, trenches and island arcs. • Tectonism refers to the deformation of Earth’s cr ...
... • Currently, the Pacific Ocean basin is shrinking as other ocean basins expand. • Seismicity is the frequency, magnitude and distribution of earthquakes. Earthquakes are concentrated along oceanic ridges, transform faults, trenches and island arcs. • Tectonism refers to the deformation of Earth’s cr ...
A. Identifying Tectonic Plate Boundaries B. Tectonic Plate Movement
... crust”, “continental crust”, “upper mantle”, & “magma”. Add red arrows that show what direction the Ocean Crust and magma are moving. Explain what is causing the magma to rise. ...
... crust”, “continental crust”, “upper mantle”, & “magma”. Add red arrows that show what direction the Ocean Crust and magma are moving. Explain what is causing the magma to rise. ...
A. Identifying Tectonic Plate Boundaries B. Tectonic Plate Movement
... crust”, “continental crust”, “upper mantle”, & “magma”. Add red arrows that show what direction the Ocean Crust and magma are moving. Explain what is causing the magma to rise. ...
... crust”, “continental crust”, “upper mantle”, & “magma”. Add red arrows that show what direction the Ocean Crust and magma are moving. Explain what is causing the magma to rise. ...
Mantle Convection
... slab pull may each play a role in driving plate movements. All three hypotheses may be important in identifying the cause of plate movements. To understand the hypotheses described below, it is important to remember that the asthenosphere—a layer in the upper mantle—provides the plates with a surfac ...
... slab pull may each play a role in driving plate movements. All three hypotheses may be important in identifying the cause of plate movements. To understand the hypotheses described below, it is important to remember that the asthenosphere—a layer in the upper mantle—provides the plates with a surfac ...
Seafloor Spreading
... of the crust and part of the upper mantle. Plates can move together as Convergent Boundaries. Convection Currents are the energy in the mantle that forces magma up to the crust. Volcanoes and earthquakes are a result of movement of these currents. Magma rises up and pushes old magma to the side, cau ...
... of the crust and part of the upper mantle. Plates can move together as Convergent Boundaries. Convection Currents are the energy in the mantle that forces magma up to the crust. Volcanoes and earthquakes are a result of movement of these currents. Magma rises up and pushes old magma to the side, cau ...
Mountain Building
... mountain belt B. Most mountain building occurs at convergent plate boundaries 1.Two types occur at subduction zones, related to the character of the overriding plate a. Aleutian Type—island arcs b. Andean Type—continental magmatic arcs 2.continent-continent convergence has no subduction II. Aleutian ...
... mountain belt B. Most mountain building occurs at convergent plate boundaries 1.Two types occur at subduction zones, related to the character of the overriding plate a. Aleutian Type—island arcs b. Andean Type—continental magmatic arcs 2.continent-continent convergence has no subduction II. Aleutian ...
Dynamic Ocean Floor
... • Longer and also higher then any other mountain range on any continent. • The ridges are home to Earth's highest mountains, and deepest canyons. • The shape of the mid-ocean ridge is controlled by the rate the plates move apart. ...
... • Longer and also higher then any other mountain range on any continent. • The ridges are home to Earth's highest mountains, and deepest canyons. • The shape of the mid-ocean ridge is controlled by the rate the plates move apart. ...
The Effects of Plate Boundaries
... and continental plate meet. The ocean plate is heavier and slides under the continent. Often results in volcanoes on land and mountain ranges ...
... and continental plate meet. The ocean plate is heavier and slides under the continent. Often results in volcanoes on land and mountain ranges ...
Plate Boundaries
... – Iceland* (formed right on top of MidAtlantic Ridge) – Volcanoes – Earthquakes – Mountains • Fault-block mountains (one side is dropping lower as crust spreads) ...
... – Iceland* (formed right on top of MidAtlantic Ridge) – Volcanoes – Earthquakes – Mountains • Fault-block mountains (one side is dropping lower as crust spreads) ...
1 Plate Tectonics Review w
... • Three layers in crust – Upper layer – consists of sediments over pillow lavas ...
... • Three layers in crust – Upper layer – consists of sediments over pillow lavas ...
Powerpoint presentation for Lecture 3 - e
... magnetic moment when they are cooled below the Curie Temperature ...
... magnetic moment when they are cooled below the Curie Temperature ...
PT Notes Fill in
... 1. _____________________________ and ________________________ led to this theory B. ________________________ – the _____________________________ of Earth composed of the ____________________________________________________ 1. Broken into puzzle like pieces called __________________ 2. ______________ ...
... 1. _____________________________ and ________________________ led to this theory B. ________________________ – the _____________________________ of Earth composed of the ____________________________________________________ 1. Broken into puzzle like pieces called __________________ 2. ______________ ...
PLATE TECTONICS - New Jersey City University
... – Plates move & change in size thru time Activity at plate boundaries ...
... – Plates move & change in size thru time Activity at plate boundaries ...
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.