Presentation top top theme: "Warm up 11/18 The broad, contempt dome-shaped volcanoes of Hawaii room ____. A. Cinder cone volcanoesc. Pyroclastic volcanoes b. Composite cone volcanoesd."— Presentation transcript:




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1 warmth Up 11/18 The broad, contempt dome-shaped volcanoes of Hawaii room ____. A. Cinder cone volcanoesc. Pyroclastic volcanoes b. Composite cone volcanoesd. Shield volcanoes The many violent volcanic eruptions are linked with what kind of volcano? a. Composite conesc. Fissure eruptions b. Shield volcanoesd. Cinder cap A magma’s viscosity is directly related come its ____. A. Agec. Silica contents b. Depthd. Shade Answers: 1) d. 2) a.

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3) c.

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2 Intrusive Igneous ActivityChapter 10, ar 2

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3 Plutons Plutons – frameworks that result from the cooling and also hardening the magma at depth They have the right to only be learned after uplift and also erosion have actually exposed them to the surface ar Intrusive igneous bodies, or plutons, are typically classified follow to their shape, size, and also relationship to the neighboring rock layers

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4 Sills and also Laccoliths Sills and also laccoliths space plutons that type when magma is coercion close to the surface Sill – develops when magma is injected along sedimentary bedding surfaces, parallel to the bedding planes because that a sill come form, the sedimentary rock need to be lifted to a height equal come the thickness the the sill Laccoliths – forms when magma intrudes right into sedimentary bedding surfaces, collects together a lens-shaped mass the pushes the overlying strata upwards

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5 Sills

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6 Laccoliths

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7 Concept check How room sills and also laccoliths alike?They space both plutons formed by magma intrusions close to the surface just how are sills and laccoliths different? They different in shape and also usually ingredient

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8 Dikes and also Batholiths Dikes – plutons that type when magma is injected right into fractures, cutting throughout preexisting absent layers plenty of dikes type when magma indigenous a big magma chamber invades fractures in the bordering rocks Batholiths – the largest intrusive bodies, must have a surface ar exposure higher than 100 square kilometers Batholiths may type the core of mountain ranges

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9 Dikes

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10 Batholiths

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11 Basic Igneous Structures

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12 origin of Magma earth’s crust and also mantle room composed primarily of solid, no molten, rock, and also the fluid iron in the external core is too thick to travel all the means to the surface ar Geologists conclude that magma originates when basically solid rock, located in the crust and upper mantle, partly melts The many obvious means to create magma indigenous solid rock is come raise the temperature above the level at which the rock starts to melt

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13 The duty of heat The price of change of temperature together you move down into the top crust is ~20-30º per kilometre Geothermal Gradient – the readjust in temperature through depth at a depth that ~100 km, temperature arrays from 1400ºC and 1600ºC, almost the melting suggest of rock Subduction zones include friction (another way to develop heat) and also water (which lowers the melting temperature the rock) to offer the included heat required to melt the crustal rocks name is mantle rocks deserve to rise and also intrude into crustal rocks, melt them

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14 Geothermal Gradient

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15 Concept check What is a geothermal gradient?The adjust in temperature through depth

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16 Magma development at Subduction Zones

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17 The function of pressure Pressure likewise increases with depthMelting occurs at higher temperatures together you go deeper into Earth, because rise in the confining pressure causes rise in the rock’s melt temperature Reducing the confining pressure lowers a rock’s melt temperature Decompression melting – triggered once the confining pressure drops sufficient to melt the rock

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