metamorphism associated with extensional rifting of Gondwana
... ages which post-date the stretching event (Oxburgh 1982). The resulting metamorphic fabric could be a regional extensional foliation, a localized foliation associated with deep crustal shear zones, or a combination of the two. Associated folding may occur in zones of relative displacement, such as s ...
... ages which post-date the stretching event (Oxburgh 1982). The resulting metamorphic fabric could be a regional extensional foliation, a localized foliation associated with deep crustal shear zones, or a combination of the two. Associated folding may occur in zones of relative displacement, such as s ...
The Mantle
... The crust of the Earth is broken into many pieces called plates. At the junction of these plates some interesting things occur! ...
... The crust of the Earth is broken into many pieces called plates. At the junction of these plates some interesting things occur! ...
U-Pb MINERAL AGE DETERMINATIONS FROM ARCHEAN ROCKS
... south by overthrusted Paleoproterozoic schists and in the north by the metasedimentary rocks of the Tuntsa belt. It comprises tonalitic and granitic gneisses, which locally contain metasedimentary and metavolcanic relics. The granitic gneisses may be migmatized tonalites. Mafic dykes cross-cutting t ...
... south by overthrusted Paleoproterozoic schists and in the north by the metasedimentary rocks of the Tuntsa belt. It comprises tonalitic and granitic gneisses, which locally contain metasedimentary and metavolcanic relics. The granitic gneisses may be migmatized tonalites. Mafic dykes cross-cutting t ...
Powerpoint Presentation Physical Geology, 10/e
... • Seismic wave studies indicate the mantle, like the crust, is made of solid rock with only isolated pockets of magma • Higher seismic wave velocity (8 km/sec) of mantle vs. crustal rocks indicative of denser, ultramafic composition • Crust and upper mantle together form the lithosphere, the brittle ...
... • Seismic wave studies indicate the mantle, like the crust, is made of solid rock with only isolated pockets of magma • Higher seismic wave velocity (8 km/sec) of mantle vs. crustal rocks indicative of denser, ultramafic composition • Crust and upper mantle together form the lithosphere, the brittle ...
GEOLOGY CURRICULUM Unit 1: Introduction to Geology
... What are the laws, principles, and techniques used to establish relative dates? What are the conditions that favor the preservation of organisms as fossils? How are radioactive isotopes used in radiometric dating? Why is it difficult to assign reliable numerical dates to samples of sedimentary rock? ...
... What are the laws, principles, and techniques used to establish relative dates? What are the conditions that favor the preservation of organisms as fossils? How are radioactive isotopes used in radiometric dating? Why is it difficult to assign reliable numerical dates to samples of sedimentary rock? ...
Template - 2 Round J..
... What do the oceanic and continental crust as well as the upper mantle make up? ...
... What do the oceanic and continental crust as well as the upper mantle make up? ...
a) normal fault - cloudfront.net
... In this activity, you will build a model of the earth’s crust. Using this model, you can demonstrate the action of the three types of faults we have discussed. A FAULT is a crack within the earth’s crust. A fault should not be confused with a BOUNDARY, which is the edge of an entire tectonic plate. ...
... In this activity, you will build a model of the earth’s crust. Using this model, you can demonstrate the action of the three types of faults we have discussed. A FAULT is a crack within the earth’s crust. A fault should not be confused with a BOUNDARY, which is the edge of an entire tectonic plate. ...
Ductile shear zone and brittle faults in the southwestern slope of
... The Svishtiplaz allochthone was recognised by Kouykin and Milanov (1970) and Kouykin et al. (1971), who argued that this fault was the eastern continuation of Kashana thrust. Later it was assumed to be part of the Etropole thrust (Antonov, 1976). The thrust plane is traced along the northwestern and ...
... The Svishtiplaz allochthone was recognised by Kouykin and Milanov (1970) and Kouykin et al. (1971), who argued that this fault was the eastern continuation of Kashana thrust. Later it was assumed to be part of the Etropole thrust (Antonov, 1976). The thrust plane is traced along the northwestern and ...
Lithostratigraphy
... record of every continent into discrete package, which Sloss and others, called Sequences ...
... record of every continent into discrete package, which Sloss and others, called Sequences ...
Powerpoint Presentation Physical Geology, 10/e
... channels, floodplains, lakes, deltas, beaches, dunes, shallow marine, reefs, deep marine ...
... channels, floodplains, lakes, deltas, beaches, dunes, shallow marine, reefs, deep marine ...
Chapter 5 - Volcanoes and Other Igneous Activity
... • Most volcanoes are located within or near ocean basins • Basaltic rocks = oceanic and continental settings • Granitic rocks = continental settings ...
... • Most volcanoes are located within or near ocean basins • Basaltic rocks = oceanic and continental settings • Granitic rocks = continental settings ...
IOCG and Porphyry-Cu deposits in Northern
... orogeny (1.82–1.80 Ga), orogenic collapse and stabilization of the Fennoscandian Shield took place at 1.79–1.77 Ga. The Gothian orogeny (1.73–1.55 Ga) at the southwestern margin of the shield ended the Palaeoproterozoic orogenic development. ing continental extension stage (1.86–1.84 Ga) was caused ...
... orogeny (1.82–1.80 Ga), orogenic collapse and stabilization of the Fennoscandian Shield took place at 1.79–1.77 Ga. The Gothian orogeny (1.73–1.55 Ga) at the southwestern margin of the shield ended the Palaeoproterozoic orogenic development. ing continental extension stage (1.86–1.84 Ga) was caused ...
Imaging continental collision and subduction in the Pamir mountain
... Subduction of continental crust is the mode of shortening in continental collision that is the least well understood. It is known to occur, as testified e.g., by now exhumed ultra-high-pressure rocks, despite the fact that continental crust is generally too buoyant to submerge into the mantle. Conti ...
... Subduction of continental crust is the mode of shortening in continental collision that is the least well understood. It is known to occur, as testified e.g., by now exhumed ultra-high-pressure rocks, despite the fact that continental crust is generally too buoyant to submerge into the mantle. Conti ...
New Geologic Mapping, Tahoe/Donner Region - Earth Science
... Tahoe/Truckee graben is bounded on east by major fault along state line. Much evidence of recent faulting on other faults (Schweickert et al., 2000). ...
... Tahoe/Truckee graben is bounded on east by major fault along state line. Much evidence of recent faulting on other faults (Schweickert et al., 2000). ...
Basin processes
... to loading of the lithosphere by sedimentary and volcanic in-fill of the rift. This type of subsidence will create wide basins without faulting. The Norwegian-Danish basin in the North Sea area also has subsided gradually during the Triassic without faulting, but only few rift structures have been i ...
... to loading of the lithosphere by sedimentary and volcanic in-fill of the rift. This type of subsidence will create wide basins without faulting. The Norwegian-Danish basin in the North Sea area also has subsided gradually during the Triassic without faulting, but only few rift structures have been i ...
Glossary of Terms - Department of Natural Resources
... ANDESITE: a fine-grained volcanic rock of intermediate composition (half-way between felsic and mafic rocks, i.e., between rhyolite and basalt), consisting largely of plagioclase and one or more mafic minerals, for example, biotite, hornblende or pyroxene. It is the volcanic or extrusive equivalent ...
... ANDESITE: a fine-grained volcanic rock of intermediate composition (half-way between felsic and mafic rocks, i.e., between rhyolite and basalt), consisting largely of plagioclase and one or more mafic minerals, for example, biotite, hornblende or pyroxene. It is the volcanic or extrusive equivalent ...
Mineral and Mechanical Characterization of Earthen Building
... these fragments defining a foliation probably produced by pressure solution. The banding consists of the alternation of biotite-rich layers and quartz-rich layers several mm thick. Subeuhedral alkali feldspar phenocrysts are frequently found in the groundmass of the earthen elements. A characteristi ...
... these fragments defining a foliation probably produced by pressure solution. The banding consists of the alternation of biotite-rich layers and quartz-rich layers several mm thick. Subeuhedral alkali feldspar phenocrysts are frequently found in the groundmass of the earthen elements. A characteristi ...
2 Regional Geological Setting
... orientation of sheath folds and the strained long axes of pre-tectonic shape fabrics. The early formed thrust structures and associated planar fabrics became subsequently deformed during the later stages of the same deformation event. This event produced fold structures that are defined by the folia ...
... orientation of sheath folds and the strained long axes of pre-tectonic shape fabrics. The early formed thrust structures and associated planar fabrics became subsequently deformed during the later stages of the same deformation event. This event produced fold structures that are defined by the folia ...
The evolution of continental crust
... 3.0 to 2.5 billion years ago, the transition between the Ar- ...
... 3.0 to 2.5 billion years ago, the transition between the Ar- ...
Chapter 10
... The Caledonian orogenic belt (which extends along the northwestern edge of Europe) is part of the same trend as the Taconic orogenic belt. The Caledonian orogeny reached its climax slightly later, in the Late Silurian to early ...
... The Caledonian orogenic belt (which extends along the northwestern edge of Europe) is part of the same trend as the Taconic orogenic belt. The Caledonian orogeny reached its climax slightly later, in the Late Silurian to early ...
R7: Taylor-Evolution of Continental Crust
... 3.0 to 2.5 billion years ago, the transition between the Ar- ...
... 3.0 to 2.5 billion years ago, the transition between the Ar- ...
Peanut Butter and Jelly Geology
... will get a chance to explore the geologic forces that have created not only the San Francisco Bay as we know it, but also a lot of the landscape we see surrounding the Bay Area, such as the Sierra Nevada mountains and the Central Valley. You will use everyday food items to represent various tectonic ...
... will get a chance to explore the geologic forces that have created not only the San Francisco Bay as we know it, but also a lot of the landscape we see surrounding the Bay Area, such as the Sierra Nevada mountains and the Central Valley. You will use everyday food items to represent various tectonic ...
Plate Tectonics Tutoiral Questions
... In the 1930s, most scientists believed that Earth’s crust and interior were solid and motionless. A small group of scientists were talking about “continental drift,” which is the idea that Earth’s crust is not stationary, but is constantly shifting and moving. From seismic data, geophysical evidence ...
... In the 1930s, most scientists believed that Earth’s crust and interior were solid and motionless. A small group of scientists were talking about “continental drift,” which is the idea that Earth’s crust is not stationary, but is constantly shifting and moving. From seismic data, geophysical evidence ...
Southwest Scotland: A landscape fashioned by geology
... Some of the rocks derived from great depth consist of minerals that are not very stable at the Earth's surface and so have been altered to 'serpentinite', so-called because of the sinuous patterns of red, green and brown that run through the rock and which were thought to be reminiscent of snake ski ...
... Some of the rocks derived from great depth consist of minerals that are not very stable at the Earth's surface and so have been altered to 'serpentinite', so-called because of the sinuous patterns of red, green and brown that run through the rock and which were thought to be reminiscent of snake ski ...
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.