T2 Precambrian Geology Homework KEY
... b) It was accreted to form the Moon. c) It was unaffected by the impact. d) It sank into the Earth and combined with its core. 4) The Earth’s hotter Archean surface temperatures are indicated by the presence of: a) komatiite rocks. b) basalt rocks. c) andesite rocks. d) granite rocks. 5) Archean roc ...
... b) It was accreted to form the Moon. c) It was unaffected by the impact. d) It sank into the Earth and combined with its core. 4) The Earth’s hotter Archean surface temperatures are indicated by the presence of: a) komatiite rocks. b) basalt rocks. c) andesite rocks. d) granite rocks. 5) Archean roc ...
Book F Ch. 2 L4 NOTES
... Foliated: the texture of metamorphic rock in which the mineral grains are arranged in planes or bands Nonfoliated: the texture of metamorphic rock in which the mineral grains are not arranged in planes or bands Metamorphism: Rocks undergo the process of metamorphism when exposed to high heat (temp ...
... Foliated: the texture of metamorphic rock in which the mineral grains are arranged in planes or bands Nonfoliated: the texture of metamorphic rock in which the mineral grains are not arranged in planes or bands Metamorphism: Rocks undergo the process of metamorphism when exposed to high heat (temp ...
CENTRE FOR CRUSTAL PETROLOGY, DEPARTMENT OF
... 1. Anatectic recycling of the crust. This project will be focussed on the granulite facies metasediments and peraluminous granitic rocks of the Araçuai orogeny in eastern Brazil and will involve field work in Brazil and collaboration with several researchers at the universities of Ouro Preto and Bel ...
... 1. Anatectic recycling of the crust. This project will be focussed on the granulite facies metasediments and peraluminous granitic rocks of the Araçuai orogeny in eastern Brazil and will involve field work in Brazil and collaboration with several researchers at the universities of Ouro Preto and Bel ...
EPSC233ArcheanEarth2
... Iceland is unusual because it is a baby continent growing near a mid-ocean ridge (shown on left). Most continental crust is probably created near subduction zones (as shown below), where partial melting of oceanic crust takes place as it is subducted. Greenstone belts were probably folded during su ...
... Iceland is unusual because it is a baby continent growing near a mid-ocean ridge (shown on left). Most continental crust is probably created near subduction zones (as shown below), where partial melting of oceanic crust takes place as it is subducted. Greenstone belts were probably folded during su ...
Archean Greenstone Belts: What are they?
... and base metal mineral deposits and by association are very important to their local economies. The metallogeny of each greenstone belt is directly linked to their unique geodynamic settings and geological history. However, the geodynamic settings are more often than not poorly understood and the re ...
... and base metal mineral deposits and by association are very important to their local economies. The metallogeny of each greenstone belt is directly linked to their unique geodynamic settings and geological history. However, the geodynamic settings are more often than not poorly understood and the re ...
Geology of the Feather River
... 544 million years to 255 million years ago Western margin of North American craton was 600 – 700 miles to the east 20,000 – 30,000 feet of rock deposited in deep ocean Chert (formed from radiolaria) Volcanic ash and breccia from volcanoes caused by subduction to west. ...
... 544 million years to 255 million years ago Western margin of North American craton was 600 – 700 miles to the east 20,000 – 30,000 feet of rock deposited in deep ocean Chert (formed from radiolaria) Volcanic ash and breccia from volcanoes caused by subduction to west. ...
Department of Geology and Geological Engineering
... base metal mineral deposits and by association are very important to their local economies. The metallogeny of each greenstone belt is directly linked to their unique geodynamic settings and geological history. However, the geodynamic settings are more often than not poorly understood and the relati ...
... base metal mineral deposits and by association are very important to their local economies. The metallogeny of each greenstone belt is directly linked to their unique geodynamic settings and geological history. However, the geodynamic settings are more often than not poorly understood and the relati ...
Quiz 9: Archean Tectonics (Ch. 11) 1. Komatiites are often found in
... 1. Komatiites are often found in greenstone belts. What does this tell us about the Archean which is different from today? peridotite rocks (mantle) melted at higher temperatures near the surface ...
... 1. Komatiites are often found in greenstone belts. What does this tell us about the Archean which is different from today? peridotite rocks (mantle) melted at higher temperatures near the surface ...
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.