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test - Scioly.org
... 70. Earth’s lithosphere is broken into about ________ plates a. 20 b. 22 c. 34 d. 18 e. 41 71. Every year Earth’s magnetic declination changes by about ____________ degrees. a. 0.7-1.0 b. 0.2-0.5 c. 0.1-1.0 d. 1.2-1.5 e. 2.0-2.3 72. Earth’s last magnetic reversal occurred about ______________ ago. ...
... 70. Earth’s lithosphere is broken into about ________ plates a. 20 b. 22 c. 34 d. 18 e. 41 71. Every year Earth’s magnetic declination changes by about ____________ degrees. a. 0.7-1.0 b. 0.2-0.5 c. 0.1-1.0 d. 1.2-1.5 e. 2.0-2.3 72. Earth’s last magnetic reversal occurred about ______________ ago. ...
FELDSPAR EQUILIBRIA AND THEIR IMPLICATION I A. Feldspar in
... abiy in equilibrium with each other at the time of crystallization are connected with lines. The diagram clearly demonstrates that calcic plagioclase is in equilibrium with potassic sanidine, and sodic plagio clase with sodic sanidine. It thus follo ws from the diagram that the alcali feldspars for ...
... abiy in equilibrium with each other at the time of crystallization are connected with lines. The diagram clearly demonstrates that calcic plagioclase is in equilibrium with potassic sanidine, and sodic plagio clase with sodic sanidine. It thus follo ws from the diagram that the alcali feldspars for ...
Geologic Map of the Phoenix Mountains, Central Arizona
... Shaw Butte: Shaw Butte, located in the northwestern end of the range, consists of Proterozoic granodiorite and tonalite (Shaw Butte Granodiorite) overlain by two basalt flows similar to those at Moon Hill. An older basalt has been dated at approximately 20 Ma, whereas the younger basalt caps the but ...
... Shaw Butte: Shaw Butte, located in the northwestern end of the range, consists of Proterozoic granodiorite and tonalite (Shaw Butte Granodiorite) overlain by two basalt flows similar to those at Moon Hill. An older basalt has been dated at approximately 20 Ma, whereas the younger basalt caps the but ...
Chapter 9 Volcanoes
... Most explosive eruptions do not produce lava flows. Instead of flowing calmly over the Earth’s surface, magma sprays into the air in tiny droplets. The droplets harden to form particles called ash. The ash from an explosive eruption can reach the upper parts of the Earth’s atmosphere. It can stay th ...
... Most explosive eruptions do not produce lava flows. Instead of flowing calmly over the Earth’s surface, magma sprays into the air in tiny droplets. The droplets harden to form particles called ash. The ash from an explosive eruption can reach the upper parts of the Earth’s atmosphere. It can stay th ...
COMPOSITION OF PALAEOGENE VOLCANITES OF THE REGION
... On the basis of the modal and normative composition, as well as of the petrochemical characteristics of the volcanic rocks from UAG, they can be referred to the normal to subalkaline trachydacite-trachyrhyolite series (CNI, TAS) or to the high-K dacite-rhyolite series (K-Si diagram) (Fig. 1). The ro ...
... On the basis of the modal and normative composition, as well as of the petrochemical characteristics of the volcanic rocks from UAG, they can be referred to the normal to subalkaline trachydacite-trachyrhyolite series (CNI, TAS) or to the high-K dacite-rhyolite series (K-Si diagram) (Fig. 1). The ro ...
Chapter 7 Lecture PowerPoint Handout
... Agents of Metamorphism • The importance of parent rock– Most metamorphic rocks have the same overall chemical composition as the parent rock from which they formed – Mineral makeup determines, to a large extent, the degree to which each metamorphic agent will cause change ...
... Agents of Metamorphism • The importance of parent rock– Most metamorphic rocks have the same overall chemical composition as the parent rock from which they formed – Mineral makeup determines, to a large extent, the degree to which each metamorphic agent will cause change ...
K-Fsp can be classified as Sanidine on the basis of low
... rock is given a particular name. Your knowledge will be tested in the next Lab, which starts with an independent assignment on a thin section of a volatile-rich rock. Introduction: This lab introduces exotic, rare magmatic rocks rich in volatiles. Kimberlites are potassic ultramafic, CO2-rich rocks ...
... rock is given a particular name. Your knowledge will be tested in the next Lab, which starts with an independent assignment on a thin section of a volatile-rich rock. Introduction: This lab introduces exotic, rare magmatic rocks rich in volatiles. Kimberlites are potassic ultramafic, CO2-rich rocks ...
Metamorphic Rocks
... Source of Heat – Proximity to igneous intrusions • Contact metamorphism • Zones if different metamorphic grade ring the intrusion ...
... Source of Heat – Proximity to igneous intrusions • Contact metamorphism • Zones if different metamorphic grade ring the intrusion ...
Divergent Plate Boundaries - North Coast Distance Education
... basalt and is not deformed by folding. Its main structures are due to extensional forces, resulting in normal faulting and basaltic igneous activity. The midocean ridge is not one continuous fracture. It is broken into segments defined by offsets (Figure 19.3B). Many involve transform faults and the ...
... basalt and is not deformed by folding. Its main structures are due to extensional forces, resulting in normal faulting and basaltic igneous activity. The midocean ridge is not one continuous fracture. It is broken into segments defined by offsets (Figure 19.3B). Many involve transform faults and the ...
Partial melting - simple process, huge global
... Rocks are made of minerals, which all have different melting points. Minerals containing oxygen (O) and silicon (Si) have the lowest melting points, whilst minerals that contain iron (Fe) and magnesium (Mg) have the highest melting points. When rocks are heated, they often don’t melt completely – th ...
... Rocks are made of minerals, which all have different melting points. Minerals containing oxygen (O) and silicon (Si) have the lowest melting points, whilst minerals that contain iron (Fe) and magnesium (Mg) have the highest melting points. When rocks are heated, they often don’t melt completely – th ...
Earth`s+Layers+Worksheet+PowerPoint
... Inner Core Intense pressure makes the inner core a solid even though it is very hot Inner core is made up o f metals (iron & nickle) Inner core has the highest/greatest temperature, pressure and density ...
... Inner Core Intense pressure makes the inner core a solid even though it is very hot Inner core is made up o f metals (iron & nickle) Inner core has the highest/greatest temperature, pressure and density ...
Magma Composition and Igneous Rocks By Dr. James Brophy
... quite obvious when the same data are portrayed graphically on an xy data plot. Figure 2.2 shows a plot of wt. % SiO2 on the x-axis versus the Wt. % of FeO, MgO, CaO, Na2O and K2O on the y-axis for all four rocks listed in \Table 2.1. The figure clearly shows that as the SiO2 content of each successi ...
... quite obvious when the same data are portrayed graphically on an xy data plot. Figure 2.2 shows a plot of wt. % SiO2 on the x-axis versus the Wt. % of FeO, MgO, CaO, Na2O and K2O on the y-axis for all four rocks listed in \Table 2.1. The figure clearly shows that as the SiO2 content of each successi ...
VOLCANIC HAZARDS
... Pyroclastic surges are turbulent low-concentration density currents of gases, rock debris and in some cases, water, that move above the ground surface at high velocities. They overtop high topographic features and are not confined to valleys. However, this type of flow usually does not travel as far ...
... Pyroclastic surges are turbulent low-concentration density currents of gases, rock debris and in some cases, water, that move above the ground surface at high velocities. They overtop high topographic features and are not confined to valleys. However, this type of flow usually does not travel as far ...
The Farallon-Aluk ridge collision with South America: Implications
... convergence geometry and rates, ocean-floor topography, the arrival of active ocean ridges, and the fission of ocean plates. The continental counterpart in the active margin is subjected, in most cases, to compression during subduction and relaxation during transform episodes. In addition to the thick ...
... convergence geometry and rates, ocean-floor topography, the arrival of active ocean ridges, and the fission of ocean plates. The continental counterpart in the active margin is subjected, in most cases, to compression during subduction and relaxation during transform episodes. In addition to the thick ...
Chapter 18: Granitoid Rocks
... “Granitoids” (sensu lato): loosely applied to a wide range of felsic plutonic rocks Focus on non-continental arc intrusives ...
... “Granitoids” (sensu lato): loosely applied to a wide range of felsic plutonic rocks Focus on non-continental arc intrusives ...
Summary of Research Projects John W. Shervais Department of Geology Professor and Head
... overlying crust was extracted, and its mineralogy and composition reflect the processes that have affected it through time, including melt extraction, fluid phase enrichment, and subsequent interactions with melt derived from lower in the mantle tectosphere. These processes have been frozen in place ...
... overlying crust was extracted, and its mineralogy and composition reflect the processes that have affected it through time, including melt extraction, fluid phase enrichment, and subsequent interactions with melt derived from lower in the mantle tectosphere. These processes have been frozen in place ...
Igneous Rocks - AC Reynolds High
... involved in the formation of magma are temperature, pressure, water content, and mineral composition. Temperature generally increases with depth in Earth’s crust. This temperature increase, known as the geothermal gradient, is plotted in Figure 5-2A. Oil-well drillers and miners, such as those shown ...
... involved in the formation of magma are temperature, pressure, water content, and mineral composition. Temperature generally increases with depth in Earth’s crust. This temperature increase, known as the geothermal gradient, is plotted in Figure 5-2A. Oil-well drillers and miners, such as those shown ...
Mantle Convection and Structure
... large (10%) extent of melting at shallow depth. Depleted in incompatible elements (including K, U, Th) - probably as a result of earlier melting episodes. Isotope ratios indicate ancient depletion. ...
... large (10%) extent of melting at shallow depth. Depleted in incompatible elements (including K, U, Th) - probably as a result of earlier melting episodes. Isotope ratios indicate ancient depletion. ...
Chapter4.pdf
... rising of the hot asthenosphere. As the asthenosphere rises it melts to form magma, which, because it is more buoyant that the surrounding rock, continues to rise to fill a magma chamber located in the crust below the ridge axis. • Magma that solidifies along the chamber sides makes gabbro, a coarse ...
... rising of the hot asthenosphere. As the asthenosphere rises it melts to form magma, which, because it is more buoyant that the surrounding rock, continues to rise to fill a magma chamber located in the crust below the ridge axis. • Magma that solidifies along the chamber sides makes gabbro, a coarse ...
Chapter 4 2004.ppt
... • Two continents may approach each other and collide. • As the sea floor that lies between them is subducted, the ocean becomes narrower and narrower until the continents collide with each other. • One continent may slide a short distance beneath another, but it will not go down into a subduction zo ...
... • Two continents may approach each other and collide. • As the sea floor that lies between them is subducted, the ocean becomes narrower and narrower until the continents collide with each other. • One continent may slide a short distance beneath another, but it will not go down into a subduction zo ...
Document
... • Forms the continents, and extends a little beyond them (the continental shelf and continental slope) • Mainly GRANITIC rock type • Density 2.7g/cm3 • Formed over a long period of time • Thickness varies, up to 70km thick in ...
... • Forms the continents, and extends a little beyond them (the continental shelf and continental slope) • Mainly GRANITIC rock type • Density 2.7g/cm3 • Formed over a long period of time • Thickness varies, up to 70km thick in ...
PETROGENESIS OF THE MAGLAJ VOLCANICS, CENTRAL BOSNIA
... allotriomorphic to hypidiomorphic phenocryst, and considerably fresher than plagioclase. Quartz occurs in the form of large phenocrysts (1.5-2.5 mm), which are smaller and less abundant than plagioclase phenocrysts. Characteristically, they are all rounded quartz grains due to magmatic resorption, a ...
... allotriomorphic to hypidiomorphic phenocryst, and considerably fresher than plagioclase. Quartz occurs in the form of large phenocrysts (1.5-2.5 mm), which are smaller and less abundant than plagioclase phenocrysts. Characteristically, they are all rounded quartz grains due to magmatic resorption, a ...
petrogenesis of the maglaj volcanics, central bosnia
... allotriomorphic to hypidiomorphic phenocryst, and considerably fresher than plagioclase. Quartz occurs in the form of large phenocrysts (1.5-2.5 mm), which are smaller and less abundant than plagioclase phenocrysts. Characteristically, they are all rounded quartz grains due to magmatic resorption, a ...
... allotriomorphic to hypidiomorphic phenocryst, and considerably fresher than plagioclase. Quartz occurs in the form of large phenocrysts (1.5-2.5 mm), which are smaller and less abundant than plagioclase phenocrysts. Characteristically, they are all rounded quartz grains due to magmatic resorption, a ...
Basalt
![](https://commons.wikimedia.org/wiki/Special:FilePath/BasaltUSGOV.jpg?width=300)
Basalt (pronounced /bəˈsɔːlt/, /ˈbæsɒlt/, /ˈbæsɔːlt/, or /ˈbeɪsɔːlt/)is a common extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon. Flood basalt describes the formation in a series of lava basalt flows.