Walter - Department of Earth Sciences
... Composed of a mixture of coarse reddish potassium feldspar and quartz crystals, these paving stones are granite blocks from the St. Cloud area. They originally formed from the slow cooling of a silica-rich magma, as a convergent collision boundary built a mountain range across Minnesota. Millions of ...
... Composed of a mixture of coarse reddish potassium feldspar and quartz crystals, these paving stones are granite blocks from the St. Cloud area. They originally formed from the slow cooling of a silica-rich magma, as a convergent collision boundary built a mountain range across Minnesota. Millions of ...
Midterm Review Answers
... 36. Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole? A) granite C) gabbro ...
... 36. Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole? A) granite C) gabbro ...
Magmas and Igneous Rocks
... lower pressure or depth, carrying its heat with it. If the raised geothermal gradient becomes higher than the initial melting temperature at any pressure, then a partial melt will form. Liquid from this partial melt can be separated from the remaining crystals because, in general, liquids have a low ...
... lower pressure or depth, carrying its heat with it. If the raised geothermal gradient becomes higher than the initial melting temperature at any pressure, then a partial melt will form. Liquid from this partial melt can be separated from the remaining crystals because, in general, liquids have a low ...
8th Science
... Use of examples of rock samples of sedimentary, metamorphic, & igneous rocks TTW have students make a 15 square foldable. There will 5 squares for each type of rock, Sedimentary, metamorphic, and igneous. Each table will write characterisitcs of each type of rock in there classification. Students sh ...
... Use of examples of rock samples of sedimentary, metamorphic, & igneous rocks TTW have students make a 15 square foldable. There will 5 squares for each type of rock, Sedimentary, metamorphic, and igneous. Each table will write characterisitcs of each type of rock in there classification. Students sh ...
DaVince Tools Generated PDF File
... increasingly Paleozoic- and Proterozoic-rich sediments. Basalt flows locally were erupted across the sediments during sedimentation. High-angle normal faulting commenced in the middle Miocene and produced mutually offsetting NNE-trending. down-to-the-west, and WNW-trending. generally down-to-the-sou ...
... increasingly Paleozoic- and Proterozoic-rich sediments. Basalt flows locally were erupted across the sediments during sedimentation. High-angle normal faulting commenced in the middle Miocene and produced mutually offsetting NNE-trending. down-to-the-west, and WNW-trending. generally down-to-the-sou ...
Rocks and Minerals
... By definition, minerals must have a definite chemical and crystal structure. There are a huge variety of minerals, many of which are very common. In order to understand minerals, it is helpful to understand basic chemistry and the periodic table. I won't attempt to go over all of that here, just lo ...
... By definition, minerals must have a definite chemical and crystal structure. There are a huge variety of minerals, many of which are very common. In order to understand minerals, it is helpful to understand basic chemistry and the periodic table. I won't attempt to go over all of that here, just lo ...
Sorting - HCC Learning Web
... • Craton – the stable interior of a continent. Shields - Large areas of exposed crystalline rocks. Platforms - Ancient crystalline rocks covered by flat-lying or gently warped sedimentary rocks. ...
... • Craton – the stable interior of a continent. Shields - Large areas of exposed crystalline rocks. Platforms - Ancient crystalline rocks covered by flat-lying or gently warped sedimentary rocks. ...
The Process of Erosion and Deposition of Sediments Power Point
... • Melting glaciers leave materials behind. • Includes huge boulders (erratics), piles of smaller rocks (moraines), glacial lakes, clay, and sand (till) ...
... • Melting glaciers leave materials behind. • Includes huge boulders (erratics), piles of smaller rocks (moraines), glacial lakes, clay, and sand (till) ...
G6 U9 Erosion and Deposition Cscope ppt
... • Melting glaciers leave materials behind. • Includes huge boulders (erratics), piles of smaller rocks (moraines), glacial lakes, clay, and sand (till) ...
... • Melting glaciers leave materials behind. • Includes huge boulders (erratics), piles of smaller rocks (moraines), glacial lakes, clay, and sand (till) ...
GEOL 308: Natural Hazards Quiz III
... 4. What happens to oceanic crust as it gets older, in the correct order? A) crust cools, becomes more dense, and sinks B) crust becomes more dense and sinks C) crust gets more dense, cools, and rises D) crust heats, becomes less dense, and rises ...
... 4. What happens to oceanic crust as it gets older, in the correct order? A) crust cools, becomes more dense, and sinks B) crust becomes more dense and sinks C) crust gets more dense, cools, and rises D) crust heats, becomes less dense, and rises ...
Mercian 2005 v16 p138 Charnwood excursion, Carney 483KB
... ‘metasomatism’ in the occurrence of mm-size, greygreen ‘thermal’ spots. These are restricted to certain sedimentary laminae, and in places have been slightly deformed by the regional Charnian cleavage. Evidence for a Precambrian folding event, prior to diorite intrusion, is suggested in this quarry ...
... ‘metasomatism’ in the occurrence of mm-size, greygreen ‘thermal’ spots. These are restricted to certain sedimentary laminae, and in places have been slightly deformed by the regional Charnian cleavage. Evidence for a Precambrian folding event, prior to diorite intrusion, is suggested in this quarry ...
The Solid Earth - cloudfront.net
... the plate boundary. The Cascade Range of North America and the Andes of South America are examples of volcanic ranges produced by subduction. Divergent plate boundaries occur where earth’s crust splits and moves apart, creating a rift valley. Rift valleys can occur in continental and oceanic crust. ...
... the plate boundary. The Cascade Range of North America and the Andes of South America are examples of volcanic ranges produced by subduction. Divergent plate boundaries occur where earth’s crust splits and moves apart, creating a rift valley. Rift valleys can occur in continental and oceanic crust. ...
earth sciences 3313a igneous petrology
... Volcanoes are one of the main natural hazards to mankind. It is therefore important to understand the mechanisms and processes controlling volcanic eruptions. It is also clear that the materials which constitute the Earth’s atmosphere, oceans, and crust ultimately originated from the Earth’s interio ...
... Volcanoes are one of the main natural hazards to mankind. It is therefore important to understand the mechanisms and processes controlling volcanic eruptions. It is also clear that the materials which constitute the Earth’s atmosphere, oceans, and crust ultimately originated from the Earth’s interio ...
The Oaks lies upon a broad, lengthy belt of rocks which extend in
... covered much of the southern hemisphere. It was during this time that most of the rocks that outcrop on the surface of The Oaks were formed. Compression upon the local crust continued to elevate the older crustal rocks, pushing them up into high altitudes and forming high, long mountain ranges. Volc ...
... covered much of the southern hemisphere. It was during this time that most of the rocks that outcrop on the surface of The Oaks were formed. Compression upon the local crust continued to elevate the older crustal rocks, pushing them up into high altitudes and forming high, long mountain ranges. Volc ...
Wegener - Course World
... The idea of sea-floor spreading also predicts that the rocks nearest the ridge are younger than the rocks further away, and this is just what scientists found. On either side of oceanic ridges, the age of rocks increased with increasing distance from the ridge. By the end of the 1960s, the theory of ...
... The idea of sea-floor spreading also predicts that the rocks nearest the ridge are younger than the rocks further away, and this is just what scientists found. On either side of oceanic ridges, the age of rocks increased with increasing distance from the ridge. By the end of the 1960s, the theory of ...
Lecture#4 part 2: Laramide Orogeny
... Rocky Mtn orogeny -summary• The volcanic arc associated with a subduction occurred not near the plate edges (as in the Andes, for example), but far to the east • Farallon plate dragged along the bottom of the continental crust of the N.American plate ...
... Rocky Mtn orogeny -summary• The volcanic arc associated with a subduction occurred not near the plate edges (as in the Andes, for example), but far to the east • Farallon plate dragged along the bottom of the continental crust of the N.American plate ...
5 Time Marches On - Columbus Humanities Middle School
... are the eons. Earth’s history is divided into four eons: the Hadean eon, the Archean eon, the Proterozoic eon, and the Phanerozoic eon. Most rocks and fossils on the Earth formed during the Phanerozoic eon. Scientists divide the Phanerozoic eon into three eras, which are the secondlargest divisions ...
... are the eons. Earth’s history is divided into four eons: the Hadean eon, the Archean eon, the Proterozoic eon, and the Phanerozoic eon. Most rocks and fossils on the Earth formed during the Phanerozoic eon. Scientists divide the Phanerozoic eon into three eras, which are the secondlargest divisions ...
08_chapter 2
... their original mineralogy and textures. These characters suggest that since they are not uniformly metamorphosed , the metamorphism did not take place in the continental crust, where they have been brought together ( but elsewhere, probably in the oceanic floor ( Chattopadhya et a l. ,1983). Ophioli ...
... their original mineralogy and textures. These characters suggest that since they are not uniformly metamorphosed , the metamorphism did not take place in the continental crust, where they have been brought together ( but elsewhere, probably in the oceanic floor ( Chattopadhya et a l. ,1983). Ophioli ...
Advertising - Science Outreach
... earthquakes and aftershocks for the last 1.5 years. Yet before the first earthquake happened in September 2010 any evidence that this fault existed was covered with a thick layer of gravels. Five million years ago, the rate of uplift accelerated such that the Southern Alps are now rising faster than ...
... earthquakes and aftershocks for the last 1.5 years. Yet before the first earthquake happened in September 2010 any evidence that this fault existed was covered with a thick layer of gravels. Five million years ago, the rate of uplift accelerated such that the Southern Alps are now rising faster than ...
Castle Hill Field Guide (Teacher version)
... earthquakes and aftershocks for the last 1.5 years. Yet before the first earthquake happened in September 2010 any evidence that this fault existed was covered with a thick layer of gravels. Five million years ago, the rate of uplift accelerated such that the Southern Alps are now rising faster than ...
... earthquakes and aftershocks for the last 1.5 years. Yet before the first earthquake happened in September 2010 any evidence that this fault existed was covered with a thick layer of gravels. Five million years ago, the rate of uplift accelerated such that the Southern Alps are now rising faster than ...
Seismic, Well, and Gravity Constraints on the Structure and
... Mesozoic opening of the Gulf of Mexico was strongly influenced by pre-existing tectonic structures associated with assembly of Pangea during the Paleozoic Era. The figure at right illustrates the key sequence of events. From top to bottom, formation of the Wiggins volcanic arc by south-directed subd ...
... Mesozoic opening of the Gulf of Mexico was strongly influenced by pre-existing tectonic structures associated with assembly of Pangea during the Paleozoic Era. The figure at right illustrates the key sequence of events. From top to bottom, formation of the Wiggins volcanic arc by south-directed subd ...
IgneousPet423-13Intro
... magmatic liquids. They represent aliquots of liquid that have escaped to the surface. The compositional variation observed in the liquids that the volcanic rocks represent is produced by varying degrees of crystal fractionation of a largely “gabbroic” mineral assemblage that now comprises plutonic i ...
... magmatic liquids. They represent aliquots of liquid that have escaped to the surface. The compositional variation observed in the liquids that the volcanic rocks represent is produced by varying degrees of crystal fractionation of a largely “gabbroic” mineral assemblage that now comprises plutonic i ...
Calculation of Appalachian Erosion
... Provinces, cover an area of around 123,000 mi3 (315,000 km2) between the above latitudes.9 Based on the total volume offshore, assuming that the sediments originated from these provinces, results in an average erosion of 2.7 miles (4.37 km). However, it is likely that the sediments offshore were mos ...
... Provinces, cover an area of around 123,000 mi3 (315,000 km2) between the above latitudes.9 Based on the total volume offshore, assuming that the sediments originated from these provinces, results in an average erosion of 2.7 miles (4.37 km). However, it is likely that the sediments offshore were mos ...
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.