National Park: The predominant type of rock in Rocky Mountain National Park is granite‚ which is an igneous rock. There are two types of granite present in the park; Pikes Peak granite and silver plume granite. Pikes Peak granite is easily identified by its salmon pink color‚ created by an abundance of orthoclase feldspar. There are also whitish clear quartz crystals and pieces of dark‚ flaky‚ shiny mica. Silver plume granite which is more of a mottled black and white coloration due to the presence of
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Curling is a sport in which players slide stones on a sheet of ice towards a target area which is segmented into four concentric rings. It is related to bowls‚ boules and shuffleboard. Two teams‚ each of four players‚ take turns sliding heavy‚ polished granite stones‚ also called rocks‚ across the ice curling sheet towards the house‚ a circular target marked on the ice.[2] Each team has eight stones. The purpose is to accumulate the highest score for a game; points are scored for the stones resting closest
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form intrusions originate as either granitic or basaltic magma. Granitic magmas are low density and small quantities‚ just a few kilometers wide‚ rise slowly through the earth’s upper crust‚ pushing existing country rock aside. However‚ very large granite masses‚ which can be up to 1‚000 times larger‚ are formed when magma incorporates heated country rock. An intrusive igneous rock is called a pluton. Major plutons include batholiths and stocks. Minor plutons include dykes‚ sills and laccoliths. A
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__________________________________ Last Name First Name PRINT GEOL 1330‚ - Dr. Lapen _______________________________ Signature Exam I February 20‚ 2012 Multiple Choice (1 point each) Questions 1-6 refer to the figure below: #2 #3 #4 1) What type of plate boundary is depicted? a) b) c) d) e) convergent subduction transform divergent volcanic 2) What component of the plate boundary is represented here? a) b) c) d) e) continental crust melting
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and index minerals such as Siliminite and Garnet. Since the mineral composition indicates granulite facies‚ then its protolithic content is pelitic‚ meaning shale/mudrock. Also‚ a series of magmatic intrusions were shown the form of Lamprophyre‚ Granite‚ Pegmatite‚ and Diorite. Introduction Located within the Hudson Highlands proto-continents collided giving rise to a major crustal thickening event called the Grenville Orogeny. It is important to study it because‚ it provides the geologic history
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Igneous Textures Cooling rates influence igneous rock textures. Rapid cooling at the earth’s surface results in tiny mineral crystals that can only be seen under a microscope. The resulting extrusive igneous rocks have an aphanitic texture. Rocks that form as magma cools slowly underground (intrusive igneous rocks) develop phaneritic textures‚ in which individual mineral crystals can be seen without a microscope. Some igneous rocks exhibit visible crystals (phenocrysts) in a matrix of tiny
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Mineral: K-Feldspar K-Feldspar‚ also known as Potassium Feldspar or orthoclase‚ is the most common rock-forming mineral. It covers up about 60% of the Earth’s crust (Feldspar). Feldspar crystalizes from magma which is found in both extrusive and intrusive igneous rocks as well as metamorphic rocks (wisconsingeologicalsurvey.org). They form at medium to high temperature and at certain depths. They may also be found in some sedimentary rocks. This mineral is widespread and can mostly be found
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Handout Differentiation of Magmas By Fractional Crystallization Karl R. Wirth Geology Department Macalester College St. Paul‚ MN 55105 wirth@macalester.edu Purpose: * improve understanding of fractional crystallization and magmatic differentiation * utilize mineralogy concepts (e.g.‚ stoichiometry) * utilizeclassification and chemical variation diagrams * provide practical experience designing and using spreadsheets * provide appreciation of the historical origins
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A-CN-K (Al2O3- (CaO*+Na2O)-K2O) diagram A–CN–K ternary plot is useful tool to evaluate weathering trends in the source rock and to estimate K-metasomatism [Nesbitt and Young (1982‚ 1984); Fedo et al.‚ 1995]. The ideal weathering lines are parallel to A-CN boundary because the removal rates of Na and Ca from plagioclase are greater than the removal rate of K from k-feldspars. On the A–CN–K ternary plot (Fig.6.16) the samples are plotted more or less close to A - K boundary indicating that removal
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Hornfels DEFINITION Hornfels is a very fine-grained metamorphosed shale rock‚ usually gray to black in color. Mineral composition in variable but is usually made up of some combination of equidimensional mosaic of quartz or calcite along with inequidimensional sheet silicates in random orientation or sometimes containing andalusite porphyroblasts. OCCURANCE Hornfels forms when shale rocks come into contact with a hot igneous intrusion body at lower pressures and at the equilibrium temperature
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