Extrusive Igneous Rocks, part 1
... • A general term for dark-colored mafic igneous rocks, commonly extrusive but locally intrusive (e.g. as dikes), composed chiefly of calcic plagioclase and clinopyroxene; the fine-grained equivalent of gabbro. Nepheline, olivine, orthopyroxene, and quartz may be present in the CIPW norm, but not all ...
... • A general term for dark-colored mafic igneous rocks, commonly extrusive but locally intrusive (e.g. as dikes), composed chiefly of calcic plagioclase and clinopyroxene; the fine-grained equivalent of gabbro. Nepheline, olivine, orthopyroxene, and quartz may be present in the CIPW norm, but not all ...
Extrusive Igneous Rocks, part 1
... • A general term for dark-colored mafic igneous rocks, commonly extrusive but locally intrusive (e.g. as dikes), composed chiefly of calcic plagioclase and clinopyroxene; the fine-grained equivalent of gabbro. Nepheline, olivine, orthopyroxene, and quartz may be present in the CIPW norm, but not all ...
... • A general term for dark-colored mafic igneous rocks, commonly extrusive but locally intrusive (e.g. as dikes), composed chiefly of calcic plagioclase and clinopyroxene; the fine-grained equivalent of gabbro. Nepheline, olivine, orthopyroxene, and quartz may be present in the CIPW norm, but not all ...
Lab 4 - Basalt, Diabase, Andesite, Dacite
... Dacite • A fine-grained extrusive rock with the same general composition as andesite but having less calcic plagioclase and more quartz • According to many, it is the extrusive equivalent of granodiorite • Syn: quartz andesite • The name, given by Stache in 1863, is from the ancient Roman province ...
... Dacite • A fine-grained extrusive rock with the same general composition as andesite but having less calcic plagioclase and more quartz • According to many, it is the extrusive equivalent of granodiorite • Syn: quartz andesite • The name, given by Stache in 1863, is from the ancient Roman province ...
File - Mr. Snelgrove
... ~540 million years ago, the convection currents shifted and subduction began. As the continents “drifted” or pushed together, the ocean floor was squeezed and then pushed upward to form the Appalachian Mountains. Subduction and abduction occurred! Volcanoes were also occurring! Once the Iapetus O ...
... ~540 million years ago, the convection currents shifted and subduction began. As the continents “drifted” or pushed together, the ocean floor was squeezed and then pushed upward to form the Appalachian Mountains. Subduction and abduction occurred! Volcanoes were also occurring! Once the Iapetus O ...
PDF File - Tulane University
... crystals with liquid during cooling of a solid solution. Often the zoning is very complex, and is sometimes oscillatory. Normal zoning would show Ca - rich cores and Na - rich rims, but reverse zoning is possible under certain conditions. In metamorphic rocks plagioclase may not show twinning making ...
... crystals with liquid during cooling of a solid solution. Often the zoning is very complex, and is sometimes oscillatory. Normal zoning would show Ca - rich cores and Na - rich rims, but reverse zoning is possible under certain conditions. In metamorphic rocks plagioclase may not show twinning making ...
UNIT 10 Plate Tectonics Study Guide
... - Radioactive age-dating of the oceanic basalt rock core was found to be youngest at the ocean’s mountainous center and no more than 200 million years old at the ocean edges near the continents. - The oldest deep oceanic sediments, called “oozes” are no more than 200 million years old. (It is estim ...
... - Radioactive age-dating of the oceanic basalt rock core was found to be youngest at the ocean’s mountainous center and no more than 200 million years old at the ocean edges near the continents. - The oldest deep oceanic sediments, called “oozes” are no more than 200 million years old. (It is estim ...
Ophiolites: Figments of Oceanic Lithosphere? Geological Society
... A discontinuous zone of ophiolites, referred to by Ricou (1971a) as the 'croissant ophiolitique' extends t h r o u g h southern T u r k e y to O m a n (Fig. 1). This is the s o u t h e r n m o s t zone of ophiolites in the Middle-Eastern sector of Tethys. The ophiolites vary in character along the b ...
... A discontinuous zone of ophiolites, referred to by Ricou (1971a) as the 'croissant ophiolitique' extends t h r o u g h southern T u r k e y to O m a n (Fig. 1). This is the s o u t h e r n m o s t zone of ophiolites in the Middle-Eastern sector of Tethys. The ophiolites vary in character along the b ...
Earthquake and Volcano Readings
... Most of the structures that collapsed in the North Ridge earthquake in California were not reinforced to withstand earthquakes or had a lot of open space between supports. A structure built on solid bedrock is less likely to be damaged by an earthquake than one built on loose sediments. This is beca ...
... Most of the structures that collapsed in the North Ridge earthquake in California were not reinforced to withstand earthquakes or had a lot of open space between supports. A structure built on solid bedrock is less likely to be damaged by an earthquake than one built on loose sediments. This is beca ...
Make sure you label your diagrams and use arrows to show
... the words converge and diverge, have you created a convergent or divergent plate boundary? ____________________ ...
... the words converge and diverge, have you created a convergent or divergent plate boundary? ____________________ ...
Modification of the Continental Crust by Subduction Zone
... New whole rock analyses for Uturuncu rocks were performed at Washington State University, Pullman. Major and trace element analyses on 121 samples were performed by X-ray Fluorescence Spectrometry (XRF) on a ThermoARL Advant’XP+ automated sequential wavelength spectrometer (ThermoARL, Waltham, MA, U ...
... New whole rock analyses for Uturuncu rocks were performed at Washington State University, Pullman. Major and trace element analyses on 121 samples were performed by X-ray Fluorescence Spectrometry (XRF) on a ThermoARL Advant’XP+ automated sequential wavelength spectrometer (ThermoARL, Waltham, MA, U ...
Modification of the Continental Crust by Subduction Zone
... New whole rock analyses for Uturuncu rocks were performed at Washington State University, Pullman. Major and trace element analyses on 121 samples were performed by X-ray Fluorescence Spectrometry (XRF) on a ThermoARL Advant’XP+ automated sequential wavelength spectrometer (ThermoARL, Waltham, MA, U ...
... New whole rock analyses for Uturuncu rocks were performed at Washington State University, Pullman. Major and trace element analyses on 121 samples were performed by X-ray Fluorescence Spectrometry (XRF) on a ThermoARL Advant’XP+ automated sequential wavelength spectrometer (ThermoARL, Waltham, MA, U ...
B. The Mantle
... This causes the denser mafic materials to separate downward, leaving the less dense sialic materials above…. 2. Fractional Crystallization – Mafic materials, being high in iron and magnesium, will crystallize at a higher temperature than sialic material, that is high in silica and aluminum. If the e ...
... This causes the denser mafic materials to separate downward, leaving the less dense sialic materials above…. 2. Fractional Crystallization – Mafic materials, being high in iron and magnesium, will crystallize at a higher temperature than sialic material, that is high in silica and aluminum. If the e ...
- Earthdoc
... formation in Krishna-Godavari basin. Of these Rageshwari, Ingoli and Padra are prolific producers of gas while Rajol formation produces both oil and gas. In Bombay offshore basin, Paleocene pools are elongated in N-S direction and seem to have developed due to subsidence along nearly vertical faults ...
... formation in Krishna-Godavari basin. Of these Rageshwari, Ingoli and Padra are prolific producers of gas while Rajol formation produces both oil and gas. In Bombay offshore basin, Paleocene pools are elongated in N-S direction and seem to have developed due to subsidence along nearly vertical faults ...
Program, Abstracts, and Field Guide
... We present the U-Pb isotope data obtained using the SHRIMP technique on zircon crystals from the Żeleźniak subvolcanic intrusion in the Kaczawa Mountains, West Sudetes, SW Poland. The intrusion is composed of unmetamorphosed and not deformed fine-grained subvolcanic rocks (rhyolites, rhyodacites, tr ...
... We present the U-Pb isotope data obtained using the SHRIMP technique on zircon crystals from the Żeleźniak subvolcanic intrusion in the Kaczawa Mountains, West Sudetes, SW Poland. The intrusion is composed of unmetamorphosed and not deformed fine-grained subvolcanic rocks (rhyolites, rhyodacites, tr ...
The continental jigsaw puzzle
... of comparable land animals that could not have moved. (A widely accepted explanation before the swum across an ocean; rocks of the same type 1960s was that the continents had not moved, but and age that match; fold belts which seem to stop they were formerly linked by lost continental at the coast, ...
... of comparable land animals that could not have moved. (A widely accepted explanation before the swum across an ocean; rocks of the same type 1960s was that the continents had not moved, but and age that match; fold belts which seem to stop they were formerly linked by lost continental at the coast, ...
Determining Geologic Time
... - states that in any undisturbed sequence of sedimentary rocks, a sedimentary layer is older than the layers above it and younger than the layers below it. The youngest is always at the top. ...
... - states that in any undisturbed sequence of sedimentary rocks, a sedimentary layer is older than the layers above it and younger than the layers below it. The youngest is always at the top. ...
Metadolerites of the Vrbno Group and their origin, the
... In the deformed and retrogressively metamorphosed parts and/or on margins of thicker bodies, the metadolerites pass to greenschists of grey-green to green colour, locally sericitechlorite schists. Metadolerite bodies in borehole JR-10 are massive in the centre and intensively cleaved on the margins. ...
... In the deformed and retrogressively metamorphosed parts and/or on margins of thicker bodies, the metadolerites pass to greenschists of grey-green to green colour, locally sericitechlorite schists. Metadolerite bodies in borehole JR-10 are massive in the centre and intensively cleaved on the margins. ...
Ch 3 ppt
... moves up within the crust and eventually erupts forming a continental volcanic arc. Example: Cascades (Oregon & Washington State, U.S.) ...
... moves up within the crust and eventually erupts forming a continental volcanic arc. Example: Cascades (Oregon & Washington State, U.S.) ...
8 Multiple plate collisions and the end of the Iapetus Ocean
... compression between Eastern Avalonia and Laurentia led to the Acadian orogenic phase. The cause of this event is uncertain, but two possibilities have been put forward: either convergence of Eastern Avalonia with Laurentia continued for some time after ocean closure, or this compression was enhanced ...
... compression between Eastern Avalonia and Laurentia led to the Acadian orogenic phase. The cause of this event is uncertain, but two possibilities have been put forward: either convergence of Eastern Avalonia with Laurentia continued for some time after ocean closure, or this compression was enhanced ...
Document
... earthquakes? As an earthquake occurs, the elastically deformed rocks along the fault a . spring back to their original shape as much as possible Just after the earthquake occurs, the elastic rocks along the fault spring ...
... earthquakes? As an earthquake occurs, the elastically deformed rocks along the fault a . spring back to their original shape as much as possible Just after the earthquake occurs, the elastic rocks along the fault spring ...
Tertiary Development of the Zagros Mountains
... inner complexly deformed sub-zone. The inner belt is made up of mainly Jurassic interbedded phyllites and metavolcanics. The SSZ can be broken down into several sub-zones in order from the southwest to the northeast 1) radiolarite sub-zone, 2) Bisotun sub-zone, 3) ophiolite sub-zone, 4) marginal sub ...
... inner complexly deformed sub-zone. The inner belt is made up of mainly Jurassic interbedded phyllites and metavolcanics. The SSZ can be broken down into several sub-zones in order from the southwest to the northeast 1) radiolarite sub-zone, 2) Bisotun sub-zone, 3) ophiolite sub-zone, 4) marginal sub ...
GEOLOGY 735: Regional Tectonics
... The course will include sections on general tectonics, convergent tectonics, extensional tectonics, strike-slip settings, and methods in tectonic studies. The course will also include case-studies, where we will focus on the tectonic history of specific regions. 1-2 question quizzes will be commonly ...
... The course will include sections on general tectonics, convergent tectonics, extensional tectonics, strike-slip settings, and methods in tectonic studies. The course will also include case-studies, where we will focus on the tectonic history of specific regions. 1-2 question quizzes will be commonly ...
Geologic History of Arizona - Jan C. Rasmussen, Ph.D., Registered
... the ancestral Appalachian Mountains in the eastern U.S. This large continental assembly event caused Arizona to be above water and undergoing erosion during the most of the Ordovician and Silurian Periods, so that rocks of these ages are mostly missing in Arizona. The eastward moving North American ...
... the ancestral Appalachian Mountains in the eastern U.S. This large continental assembly event caused Arizona to be above water and undergoing erosion during the most of the Ordovician and Silurian Periods, so that rocks of these ages are mostly missing in Arizona. The eastward moving North American ...
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.