Sea Floor Spreading
... Mid-Ocean Ridge – the longest chain of mountains in the world---these are divergent plate boundaries (seafloor moves apart. ...
... Mid-Ocean Ridge – the longest chain of mountains in the world---these are divergent plate boundaries (seafloor moves apart. ...
File
... Section 11.4 Technology: Before Pangaea, Rodinia Scientists studying rock types and structures in Antarctica use computer models to show how new evidence supports the formation of a super-continent long before Pangaea Super-continent called Rodinia, formed more than 750 million years ago In th ...
... Section 11.4 Technology: Before Pangaea, Rodinia Scientists studying rock types and structures in Antarctica use computer models to show how new evidence supports the formation of a super-continent long before Pangaea Super-continent called Rodinia, formed more than 750 million years ago In th ...
Pressure, Temperature, Fluid Pressure Conditions of
... where deep crustal and/or mantle rocks are slowly exhumed to the surface. On the other hand, metamorphism can be the result of local-scale processes such as development of kilometer-large contact aureoles around plutons intruded at high crustal levels in cool country rocks, or frictional heating alo ...
... where deep crustal and/or mantle rocks are slowly exhumed to the surface. On the other hand, metamorphism can be the result of local-scale processes such as development of kilometer-large contact aureoles around plutons intruded at high crustal levels in cool country rocks, or frictional heating alo ...
Emplacement mechanism of the Middle
... petrographic facies, namely: i) Bt + Qtz + Fsd + Amp, ii) Bt + Qtz + Fsd + (Amp) , iii) Bt + Qtz + Fsd. Zircon U-Pb dating indicate the age peak of these different facies at 161Ma, 157-156Ma and 149Ma, respectively. The field observation shows that: 1) the granite is isotropic without visible prefer ...
... petrographic facies, namely: i) Bt + Qtz + Fsd + Amp, ii) Bt + Qtz + Fsd + (Amp) , iii) Bt + Qtz + Fsd. Zircon U-Pb dating indicate the age peak of these different facies at 161Ma, 157-156Ma and 149Ma, respectively. The field observation shows that: 1) the granite is isotropic without visible prefer ...
The evolution of the southern Cordilleran foreland thrust and fold
... the front of the belt it rises, across thrust ramps, into one or more higher, laterally extensive detachments that occur within Devonian, Mississippian, Jurassic and Upper Cretaceous strata. The largest and most conspicuous ramps in the thrust and fold belt formed along structures in the crystalline ...
... the front of the belt it rises, across thrust ramps, into one or more higher, laterally extensive detachments that occur within Devonian, Mississippian, Jurassic and Upper Cretaceous strata. The largest and most conspicuous ramps in the thrust and fold belt formed along structures in the crystalline ...
Making Oceans and Continents
... moving conveyor-belt. Conveyor belt formed by convection currents in the asthenosphere below Newly created crust at the ridge is elevated because it is heated and therefore occupies more volume than the cooler rocks of the deepocean basin Area also seems to be pushed up by mantle upwelling ...
... moving conveyor-belt. Conveyor belt formed by convection currents in the asthenosphere below Newly created crust at the ridge is elevated because it is heated and therefore occupies more volume than the cooler rocks of the deepocean basin Area also seems to be pushed up by mantle upwelling ...
Practice 2. Structure and composition of geospheres Geosphere
... Fig. 1. The structure of the lithosphere and earth interiors The mantle makes up the largest volume of the Earth's interior. The region beneath the mantle is called the core, and consists of two parts, a liquid outer core that is around 2250 km thick and a solid inner core 1220 km thick. The core i ...
... Fig. 1. The structure of the lithosphere and earth interiors The mantle makes up the largest volume of the Earth's interior. The region beneath the mantle is called the core, and consists of two parts, a liquid outer core that is around 2250 km thick and a solid inner core 1220 km thick. The core i ...
Introduction and project objectives
... possible with available time, finances and access to property all playing a constraining role. Large areas without measurable outcrops, as well as areas with structureless outcrops (usually post tectonic) were also unfortunately encountered. At each location with measurable structures, a waypoi ...
... possible with available time, finances and access to property all playing a constraining role. Large areas without measurable outcrops, as well as areas with structureless outcrops (usually post tectonic) were also unfortunately encountered. At each location with measurable structures, a waypoi ...
Name: _________________________ Period: ______ Date
... 47. A. Explain the movement of the plates in the above diagram. (D12-D14) The oceanic and continental plates are colliding and the more dense oceanic plate is being subducted underneath the continental plate. B. Why are volcanoes and earthquakes found along these type of plate boundaries? Volcanoes ...
... 47. A. Explain the movement of the plates in the above diagram. (D12-D14) The oceanic and continental plates are colliding and the more dense oceanic plate is being subducted underneath the continental plate. B. Why are volcanoes and earthquakes found along these type of plate boundaries? Volcanoes ...
8H The Rock Cycle
... surface and which is made up of very small crystals. fossil – The remains or traces of a plant or animal preserved in rock, common in sedimentary rock. igneous – Rocks made from magma that has cooled and solidified. intrusive – Igneous rock that formed below the Earth’s surface and which is made ...
... surface and which is made up of very small crystals. fossil – The remains or traces of a plant or animal preserved in rock, common in sedimentary rock. igneous – Rocks made from magma that has cooled and solidified. intrusive – Igneous rock that formed below the Earth’s surface and which is made ...
Petrology and Geochemistry of Basement Complex Rocks in Okom
... The geological map of Nigeria shows that the Basement Complex can distinctively be divided into two zones: a western zone in which the N-S trending elongate schist belts are separated from one another by migmatite gneisses, granite gneisses and granites and an eastern zone in which the schist belts ...
... The geological map of Nigeria shows that the Basement Complex can distinctively be divided into two zones: a western zone in which the N-S trending elongate schist belts are separated from one another by migmatite gneisses, granite gneisses and granites and an eastern zone in which the schist belts ...
Bedrock Geology Study Guide
... plates do, what landforms are made?) Give 2 examples. What happens at an ocean/ocean convergent boundary? (What do the plates do, what landforms are made?) Give 2 examples. What happens at a continent/continent convergent boundary? (What do the plates do, what landforms are made?) Give 2 examples. W ...
... plates do, what landforms are made?) Give 2 examples. What happens at an ocean/ocean convergent boundary? (What do the plates do, what landforms are made?) Give 2 examples. What happens at a continent/continent convergent boundary? (What do the plates do, what landforms are made?) Give 2 examples. W ...
1 Lecture 25: Continental rifts, Salt and Oil November 29, 2006
... 2. Continental crust may detach from the underlying mantle and leave “seafloor” composed of exposed mantle rocks—peridotite and serpentinite. This occurs off Portugal where the block-faulted, stretched crust is all exposed mantle 3. We would expect decompression melting to form plutons and volcanic ...
... 2. Continental crust may detach from the underlying mantle and leave “seafloor” composed of exposed mantle rocks—peridotite and serpentinite. This occurs off Portugal where the block-faulted, stretched crust is all exposed mantle 3. We would expect decompression melting to form plutons and volcanic ...
Chapter 4 - Volcanoes
... (1000’s of ft. high & several miles wide at base). – Composed of lava flows alternating with large quantities of pyroclastic flow deposits. ...
... (1000’s of ft. high & several miles wide at base). – Composed of lava flows alternating with large quantities of pyroclastic flow deposits. ...
PLATE TECTONICS REVIEW SHEET Write rock or metal to indicate
... 9. The type of boundary where plates collide is called a _____Convergent_______________ boundary. 10. The type of boundary where subduction occurs is a ____Convergent_______________ boundary. 11. The type of boundary where plates pull apart is called a _____Divergent______________ boundary. 12. The ...
... 9. The type of boundary where plates collide is called a _____Convergent_______________ boundary. 10. The type of boundary where subduction occurs is a ____Convergent_______________ boundary. 11. The type of boundary where plates pull apart is called a _____Divergent______________ boundary. 12. The ...
APES_Chapter_16_Part_1_Geology_Guided_Power_Point_Notes
... 15 Earthquakes occur when ____________________________ move on an existing faults, along plate boundaries and along the mid-oceanic ridges where the sea floor is spreading. 16 The point of movement underground is called the focus of the ________________________. • From the focus- seismic waves trave ...
... 15 Earthquakes occur when ____________________________ move on an existing faults, along plate boundaries and along the mid-oceanic ridges where the sea floor is spreading. 16 The point of movement underground is called the focus of the ________________________. • From the focus- seismic waves trave ...
Exploring Inside Earth
... both dry land and the ocean floor. Oceanic crust consists mostly of rocks such as basalt. Continental crust, the crust that forms the continents, consists mainly of rocks such as granite. CRUST ...
... both dry land and the ocean floor. Oceanic crust consists mostly of rocks such as basalt. Continental crust, the crust that forms the continents, consists mainly of rocks such as granite. CRUST ...
Plate Tectonics
... that lived 270 million years ago • remains (fossils) found in South America and Africa • impossible for these reptiles to have crossed the Atlantic ...
... that lived 270 million years ago • remains (fossils) found in South America and Africa • impossible for these reptiles to have crossed the Atlantic ...
Plate Tectonics
... that lived 270 million years ago • remains (fossils) found in South America and Africa • impossible for these reptiles to have crossed the Atlantic ...
... that lived 270 million years ago • remains (fossils) found in South America and Africa • impossible for these reptiles to have crossed the Atlantic ...
Rocks-and-Minerals-2010-1
... have changed. All three types of rock can be changed by heat, pressure, or a combination of both. ...
... have changed. All three types of rock can be changed by heat, pressure, or a combination of both. ...
Earth Formation Powerpoint
... • As this happens, the older crust spreads apart and the oceanic crust is spread far enough till subduction happens. • Subduction is when the oceanic crust goes under the continental crust. This causes continental crust to be pushed by the oceanic crust… contributing to Plate Tectonics ...
... • As this happens, the older crust spreads apart and the oceanic crust is spread far enough till subduction happens. • Subduction is when the oceanic crust goes under the continental crust. This causes continental crust to be pushed by the oceanic crust… contributing to Plate Tectonics ...
Week 2 background reading
... A series of underwater volcanoes exists along the margin, occasionally appearing above sea-level as volcanic islands. An example of such islands is Iceland, much of which is a lava plateau up to 200m above sea-level, with none of its rocks more than 3 million years old. ...
... A series of underwater volcanoes exists along the margin, occasionally appearing above sea-level as volcanic islands. An example of such islands is Iceland, much of which is a lava plateau up to 200m above sea-level, with none of its rocks more than 3 million years old. ...
Document
... Why is the river Sr isotope value the highest? Why is the hydrothermal Sr isotope value the lowest? Why is carbonate recrystallization Sr isotope value equal to that of seawater? ...
... Why is the river Sr isotope value the highest? Why is the hydrothermal Sr isotope value the lowest? Why is carbonate recrystallization Sr isotope value equal to that of seawater? ...
Slide 1
... • Continued convergence producing the Cascade Volcanoes • subduction of the Farallon plate stratacomposite volcanoes • Sierra Nevada batholith, Idaho batholith faulted and uplifted • Mesozoic batholiths exposed to the surface • The onset of the San Andreas Fault • A portion of California (North Am ...
... • Continued convergence producing the Cascade Volcanoes • subduction of the Farallon plate stratacomposite volcanoes • Sierra Nevada batholith, Idaho batholith faulted and uplifted • Mesozoic batholiths exposed to the surface • The onset of the San Andreas Fault • A portion of California (North Am ...
10.1 Volcanoes and Plate Tectonics Lecture Outline Origin of
... Once the sinking slab reaches a depth of about 100 to 150 kilometer, this water reduces the melting point of hot mantle rock low enough for melting to begin. The magma formed slowly migrates upward, forming volcanoes. Volcanoes from as convergent boundaries where two oceanic plates meet and where t ...
... Once the sinking slab reaches a depth of about 100 to 150 kilometer, this water reduces the melting point of hot mantle rock low enough for melting to begin. The magma formed slowly migrates upward, forming volcanoes. Volcanoes from as convergent boundaries where two oceanic plates meet and where t ...
Algoman orogeny
The Algoman orogeny, known as the Kenoran orogeny in Canada, was an episode of mountain-building (orogeny) during the Late Archean Eon that involved repeated episodes of continental collisions, compressions and subductions. The Superior province and the Minnesota River Valley terrane collided about 2,700 to 2,500 million years ago. The collision folded the Earth's crust and produced enough heat and pressure to metamorphose the rock. Blocks were added to the Superior province along a 1,200 km (750 mi) boundary that stretches from present-day eastern South Dakota into the Lake Huron area. The Algoman orogeny brought the Archaen Eon to a close, about 2,500 million years ago; it lasted less than 100 million years and marks a major change in the development of the earth’s crust.The Canadian shield contains belts of metavolcanic and metasedimentary rocks formed by the action of metamorphism on volcanic and sedimentary rock. The areas between individual belts consist of granites or granitic gneisses that form fault zones. These two types of belts can be seen in the Wabigoon, Quetico and Wawa subprovinces; the Wabigoon and Wawa are of volcanic origin and the Quetico is of sedimentary origin. These three subprovinces lie linearly in southwestern- to northeastern-oriented belts about 140 km (90 mi) wide on the southern portion of the Superior Province.The Slave province and portions of the Nain province were also affected. Between about 2,000 and 1,700 million years ago these combined with the Sask and Wyoming cratons to form the first supercontinent, the Kenorland supercontinent.