8.6.2.2 Facies Series 8.69 Metamorphic facies series. Metamorphic Petroogy - Geology Metamorphic Petrology with Rebecca Jamieson at Dalhousie University - StudyBlue Flashcards Metamorphic series include the Barrovian and Buchan series of metamorphic rocks. One of the first uses of these types of diagrams was by Eskola (1915) who employed a diagram known as the ACF diagram in his study of metamorphic rocks. These seem to occur at different pressure levels and are distinguished by different series of mineral assemblages. high. Margin of metabasic eclogite body against amphibolite-facies gneiss. Dashed red arrow indicates the typical PT path that subducted packages of rock follow in a long-lived subduction zone (i.e. However, most minerals are solid solutions that undergo compositional … Donna Whitney, University of Minnesota . Winter (2010) An Introduction to Igneous and Metamorphic Petrology. What is a P-T-t path? Stability boundaries of the other index minerals are … ACF Diagram. In the black diagram of a subduction zone (Fig. The three components plotted on ACF diagrams are A(Al 2 O 3), C(CaO), and F(FeO + MgO), making the … Metamorphic grade is an informal indication of the amount or degree of metamorphism. In order to point out some useful aspects of the facies series in various types of metamorphism, the possible stability fields of the facies described from areas of progressive metamorphism are shown in a hypothetical PT diagram. What might pressure be measured in on a PT diagram instead of GPa? What is a metamorphic facies? For abbreviations see Table 2. Because this metamorphism takes place at temperatures well below the temperature at which the rock originally formed (~1200°C), it is known as retrograde metamorphism . George Barrow was a geologist in Scotland who discovered the Barrovian series.. Other rocks of contrasting … Lecture 5: Metabasites and facies (Prof. J.S. Facies metamorphic rocks and their relative positions in space PT. Blueschist Eclogite Granulite Amphibolite t Zeolite Pyroxene Hornfels Hornblende Hornfels Sanadinite Act-Ep Hornfels Prehnite-Pumpellyite 15 10 5 0 200 400 600 800 1.-Tentative PT diagram showing possible stability fields of metamorphic facies and PT gradients curve of the granite (Tuttle and Bowen, 1958), to the curve for low-high quartz (Yoder, 1950), and to the lo 1964). Since pressure relates to depth of burial. Prentice Hall. Metamorphic facies. The changes in mineral assemblages are due to changes in the temperature and pressure conditions of … Metamorphic petrologists studying contact metamorphism early in the 20th century introduced the idea of metamorphic facies (part of a rock or group of rocks that differs from the whole formation) to correlate metamorphic events. 25.3. Yardley, 1989; Spear, 1993; Bousquet et … The diagram at right shows the distribution of metamorphic facies with temperature and pressure. Kbars-1Kbar=100MPa. The upper red line is the prograde path, the lower the retrograde. Different rocks reach different peak temperatures, varying from lower grade greenschist rocks up to granulite facies gneisses. Metamorphic zones, isograde and reaction isograde, Concept of classification of metamorphic facies, facies-series and grade, structure and textures of metamorphic rocks; chemographic projection, graphical representation of metamorphic minerals assemblages; ACF, AKF, AFM and others diagram. This diagram has been used for figures 6 and 7. FIG. blueschist to eclogite facies metamorphism). 1 Metamorphic Reactions and Stable Assemblages GEOL 13.53 Metamorphic Lecture 3 Eskolaand Metamorphic Facies • Eskola(1914, 1915) noted that metapeliticrocks in southern Finland (Orijärvi) contained the assemblage Bt-Ms whereas near Oslo, rocks contained the compositionally equivalent mineral assemblage Kf-Cd • If rocks are the same composition, then the mineralogical difference must … Blueschist (Facies) The metamorphic facies in which mafic rocks have glaucophane and sodic pyroxene. Solid solutions, chemical reactions and metamorphic facies. The pressure (P) - temperature (T) - time (t) path of a metamorphic rock is the set of all P-T conditions experienced by a rock during its metamorphic history (Figure 1). Note that any two of these minerals can occur together only under 12 40 PT conditions represented by the boundary lines in the diagram and that the three minerals Figure A7.5.2 can occur together only at the point where these three lines intersect: approximately 500'C and 4 kilobars, which normally occurs about 15 km below Earth's surface 1. 2). This diagram is in good agreement with previous published facies diagram (e.g. Yellow star denotes the location in PT space of Temperaturepressure diagram showing the three major types of metamorphic facies series proposed by Miyashiro (1973, 1994). The metamorphic facies scheme (Figures 1 and 2) requires the presence of a free aqueous fluid.The facies figures have been prepared with this premise. Solid Solutions and Exchange Vectors Some minerals (e.g., quartz) have constant composition. A p-t-diagram is designed, utilizing the latest equilibrium determinations at high pressures and temperatures on rockforming silicates. Western Norway. Introduction to chemographic analysis; Gibbs Phase Rule; properties of triangular diagrams; ACF diagram. P-T-t Paths . Metamorphism is a dynamic process, involving changes in temperature ± pressure through time. A7.5.5. Surface conditions. ACF diagram A three-component, triangular graph used to show how metamorphic mineral assemblages vary as a function of rock composition within one metamorphic facies.Besides SiO 2, the five most abundant oxides found in metamorphic rocks are Al 2 O 3, CaO, FeO, MgO, and K 2 O. Metamorphic rock - Metamorphic rock - Pressure-temperature-time paths: Interaction between metamorphic petrologists and geophysicists in the 1980s led to the realization that each metamorphic rock follows its own unique path through pressure- (depth-) temperature space during metamorphism and that these paths bear little or no resemblance to steady-state geotherms. Assumptions involved in defining the concept of metamorphic facies. Eclogite (Facies) Metamorphic facies in which mafic rocks have sodic pyroxene and almandine-pyrope garnet. Study 101 Metamorphic Petroogy flashcards on StudyBlue. Position on the conditions of pressure and temperature of each type of PT diagram a metamorphic. Concept of metamorphic facies. Metabasite mineral assemblages in the ACF diagram. evaluation of metamorphic conditions, as well as determination of the PT conditions with the use of the computer program Theriak-Domino. It represents high P/T metamorphism. (4 pt) Metamorphic Facies (Tray 5) One of the primary goals of metamorphic petrology is to interpret the pressure (P) and temperature (T) history of a rock or set of rocks, because it provides information about the tectonic history of a region. Figure 1: Pressure-temperature diagram illustrating metamorphic facies boundaries. As a model for progressive metamorphism, petrologists consider different metamorphic facies series, the sequences of metamorphic rocks that would form in different metamorphic environments. Lines A, B, and C show the geothermal gradients that would be encountered at the three marked positions on the diagram of a subduction zone above. Franciscan Facies Series (high-P, low T) 11 Fig. A three-component phase diagram used for metamafic rocks. [photo: A L … 12 Metamorphic Facies Figure 25.4. Part 6. K. Bucher, in Encyclopedia of Geology, 2005. Daly) Metabasite mineral assemblages; Classification of metamorphic grade based on metabasite assemblages; facies in PT space. Fresh eclogite on the right grades into darker-coloured rock in which omphacite is replaced by diopside-plagioclase-amphibole intergrowths. contact metamorphism iron ore. The computer program Theriak-Domino provided pseudo sections (PT diagram) with possible PT stability fields illustrated by the microstructure and mineral analysis. Metamorphic facies found in the Grenville province of Ontario collectively define a PT trend that is transcursive to the PT trends of Miyashiro's faci… 6 Norway, Western Gneiss Complex Eclogite facies, partly retrogressed. I’ve taken a standard diagram of metamorphic facies and drawn on roughly some typical P-T-t paths. Examples of nine common types are given. The PT diagram in Figure 8.69 shows the most important of these series. Partial Melting and Igneous Processes. A more complete indication of this intensity or degree is provided with the concept of metamorphic facies.. These series of metamorphic facies are presented in the PT-diagram of meta­ morphic facies (Fig. Figure 3: Metamorphic facies diagram for metapelites and metabasites (modified after Oberhänsli et al. Metamorphic zones, isograde and reaction isograde, Concept of classification of metamorphic facies, facies-series and grade, structure and textures of metamorphic rocks; chemographic projection, graphical representation of metamorphic minerals assemblages; ACF, AKF, AFM and others diagram. Mafic Rocks Read Chapter 4 of An Introduction to Metamorphic Petrology by Bruce Yardley or Chapter 25 of Igneous and Metamorphic Petrology by John Winter or Chapter 16 of Igneous and Metamorphic Petrology by Philpotts. These are also called metamorphic facies series.A metamorphic facies series is a sequence of metamorphic facies which plot in a temperature-pressure diagram along a line, and this line represents a certain geothermal gradient. place letters in the white circles that are linked to the starred locations on this illustration to show where Eskola's facies are most likely to occur A - amphibolite, G = greenschist Eeclogie, B = blueschist. ... What is the intercept on a PT diagram considered to be? See diagram for more detail. Sanbagawa Facies Series (high-P, moderate-T) 5. METAMORPHIC FACIES In general, metamorphic rocks do not drastically change chemical composition during metamorphism, except in the special case where metasomatism is involved. zeolite facies A set of metamorphic mineral assemblages produced by the metamorphism of a wide range of starting rock types under the same metamorphic conditions, and typically characterized by the development of the mineral assemblage smectite—zeolites (in addition to relict igneous plagioclase and pyroxene) in rocks of basic igneous composition. The passage of this water through the oceanic crust at 200° to 300°C promotes metamorphic reactions that change the original pyroxene in the rock to chlorite and serpentine. There are forty years of manufacturing history, with three major production bases,over 160 senior R&D engineers and 600+ large and medium-sized digital processing equipment, The first-line technicians and professional after-sales service personnel up to 2,300+ and 200+ respectively.Introducing advanced technology and craftsmanship, adopting international … Above, some exceptions from this requirement have been given with respect to the granulite and sub-greenschist facies. Why is approximate depth shown on a PT diagram? Metamorphic grades. 2004). Finnish geologist Pentii Eskola devised a facies scheme in 1915 (that ... What is the intercept on a PT diagram in figure 8.69 shows the most important these. Process, involving changes in temperature ± pressure through time fields illustrated by the microstructure and mineral analysis good... Meta­ morphic facies ( Fig facies gneisses on Metabasite assemblages ; Classification of metamorphic series... 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