important to note that the majority of these deposits are found near or at mantle plumes or subduction zones associated with back-arc volcanos. These areas may no longer be near an active mantle plume or subduction zones‚ but instead can be used to locate the ancient position of one. Porphyry deposits are most often established in areas that are zones of low-angle subduction (Crooke and Hollings‚ 2005). Subduction
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An active creep zone is one in which the most significant of displacements are likely to take place. Current absence of active creeps neither means that there is no fault creep at all‚ nor that there will not be any movement in future. A currently inactive fault could become active in future and cause an earthquake‚ so safe is not a term that one can always associate with the absence of an active creep. 3) At one time it was thought that the deep-ocean trenches at subduction zones would be a good
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this mountain has achieved this status. The three main focal points in this report revolve around tectonic plate subduction‚ uplift around the Denali fault‚ and the rock composition of the mountain. The combination of these three forces are integral reasons for why the mountain has been able to grow to its size and why it’s been able to maintain its height. To understand how subduction has affected Denali and the Alaska mountain range‚ you first need to understand how plate tectonics work. The theory
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on both the land and sea of this same significant line. The landward side of the andesite line has explosive eruption as it is located at subduction zones while the seaward side is locate at oceanic ridges. The explosiveness of the eruption has to do with the flow of the magma and for the landward side the magma originated from the subduction zone. This zone has magma that are of high viscosity‚ they are granitic-andesitic and excrude at 700-9000c‚ have thick short flows that has slaggy surface
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This event is called subduction. The subducting plate carries with it some crust sediments down into the subduction zones. The heat of the mantle melts the edges of the down-turned plate and the sediments it carried. The molten plate is called magma. The magma‚ being light‚ is pushed up against the crust. As it tries to escape to the surface‚ it sometimes creates violent explosions. As it progressed‚ belt of volcanoes were formed on above the dominant plate. When the subduction occurred underwater
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a caldera which is situated above a subduction zone where the Pacific Ocean plate is consumed beneath the South American continental crust. The volcano is composed of viscous rhyolitic lavas and pyroclastics and is typical of the magmas rising through the young fold mountains of the Andes. The eruption is said to have been triggered by a string of earthquakes that occurred on 30th April. Here is a diagram showing how Chaitén is located above a subduction zone formed where the Nazca and South American
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uranium‚ thorium. B) oxygen‚ silicon‚ uranium. C) oxygen‚ silicon‚ aluminum. D) iron‚ aluminum‚ carbon. Correct answer(s): C 5. A boundary in which crustal plates move past one another is called a: A) transform fault. B) convergent zone. C) divergent zone. D) rift valley. Correct answer(s): A 6. One cubic meter of which of these would weigh the most? A) seawater B) granite rock C) basaltic rock D) mantle Correct answer(s): D 7. The Hawaiian Islands formed as they pass over a hot
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plates slide towards one another and forms a subduction zone or a acontinental collision. Typically the deep marine trenches are associated with the subduction zones. The basins which develop along with the active boundary area are often known as the "foreland basins". • Divergent boundaries- This type of boundaries are also known as the constructive boundaries. These boundaries construct where both of the plates slide apart from one another. Active zones of the rift and mid-ocean ridges are the
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Crust: 2.7 g/cm cubed Oceanic Crust: 3.3 g/cm cubed Convergent Boundary: When the arrows are pointed towards the other direction‚ make sure to draw the subduction zone on your cross section towards the other direction as well. Convergent Boundary: When the arrows are pointed towards the other direction‚ make sure to draw the subduction zone on your cross section towards the other direction as well. What are the different types of plate boundaries? Convergent Boundary * ocean to continent
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location‚ such as Hawaii where the plate boundary is underneath a hot spot‚ which causes the Hawaiian chain islands. It is where the magma in the mantle breaks through the lithosphere to form extrusive landforms. Shield volcanoes can be formed due to subduction and they tend to start of as a submarine volcano (under water) at either an oceanic/ oceanic convergence or a hotspot. At a hotspot‚ the limited magma plumes rise and go in a circular motion due to the convection currents‚ this eventually lead to
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