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Prograde metamorphic reactions. P-T phase diagram for the reaction Ms + Qtz = Kfs ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3fd750-YTdiZ Metamorphic evolution of an accretionary wedge can be constrained by a reconstructed P–T conditions of the oceanic and continental margin fragments. These chemical reactions will cause new minerals to form. There are many ways to approach this question and the answer can sometimes be quite elusive. Examples include the production of talc under varied metamorphic conditions: 0000001303 00000 n
25.2. This is called a pseudosection. 2 0 obj
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For metamorphic rocks, pressures range from a relatively low-pressure of 3,000 bars around 50,000 bars , which occurs around 15-35 kilometers below the surface. [�S�9VpF�N���Uu�w��2�����Ak������n��C�e5+|U4~� iJrq3�ړ�p�ᙾ]t�M^-}���"��" �V�}$B"�V�l�#����j������/����J��SZ,�cX��~�I��*��~QG���=��đ��s*�{�ukv�R�ӏ5���= ��{� Prograde reactions liberate H 2 O and CO 2 from the metamorphic body. The first five deal with more theoretical aspects of the kinetics and mechanisms of meta morphic reactions, and the next six consider the interdependence of defor mation and metamorphism. The composition of any fluid phase that was present during metamorphism. Metamorphic reactions Reactions in a kaolinite-quartz system. As we discussed previously, the fluid phase plays an important role in metamorphic reactions. Metamorphic processes also commonly drive deformation. Metamorphic mineral reactions: Porphyroblast, corona and symplectite growth FRED GAIDIES1,*, R. MILKE2, W. HEINRICH3 and R. ABART4 1 Department of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada, e-mail: Fred.Gaidies@carleton.ca 2 Instiute of Geological Sciences, Free University Berlin, Malteserstr. A metamorphic reaction is a chemical reaction that takes place during the geological process of metamorphism wherein one assemblage of minerals is transformed into a second assemblage which is stable under the new temperature/pressure conditions resulting in the final stable state of the observed metamorphic rock.. 0000033745 00000 n
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Petrogenetic processes such as recrystallization, continuous and discontinuous reactions, mixed volatile reactions and deformation are addressed. The temperature reached during metamorphism. Freeman. 12 Guiraud et al. Igneous and metamorphic petrology has over the last twenty years expanded rapidly into a broad, multifaceted and increasingly quantitative science. Add to Citation Manager. Deriving and Balancing Metamorphic Reactions Dexter Perkins (University of North Dakota) Given a list of minerals, how do we determine all the possible reactions that can occur between them? 0000002931 00000 n
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The most important metamorphic polymorphs are in the Al2SiO5 system, the minerals andalusite, kyanite, and sillimanite. �@Ɯ�\8uˁ�w����2�z���~q�,�@��wl����Qe��(��f-J/`+K�*|�$o�I��k��aq5��tO��-9u�;�ᱺĕ�8�u�EYy�ܢ�x�E9��O)l�d��x�7�D�u�HQ���ۍ~F�7��.+�D_�C.S�BS��
�ɪ�y�K� =-�����cJ����ծ\ �.3D��J��I��&���������~��6Th�Ѕ�g�k�7mxb��WC�55�'�lY����X,�ܦ@V�\-㛳���έ:����ĺ�aZs9� Chapter 26: Metamorphic Reactions. Metamorphic Reactions and Metamorphic Facies Author(s) W. S. Fyfe; W. S. Fyfe Search for other works by this author on: GSW. <>
metamorphic minerals is commonly localized in shear zones. Metamorphic Facies and Metamorphosed Mafic Rocks Reading: Winter Chapter 25. • In other words , A metamorphic reaction is a chemical reaction that takes place during the geological process of metamorphism wherein one H����?�pi��8b��Vhu,�j$1��[�yU��f�;�c������N�Du89P�,Fg�m�:b!��WwB�4F������o6��q��֓��������n�b^4�ȼX͎[� 2. The “typical” or average continental geotherm is from Brown and Mussett (1993). Most metamorphic petrologists agree that the simplicity of patterns observed during dehydration reactions of noncarbonate sediments and loss of CO 2 from highly calcareous sediments suggests that partial pressures of the dominant gases and total pressures (load pressure) acting in the system are not completely independent. Contents. GLY 2010L Metamorphic Rocks HCC Ybor Campus Student Response Worksheet Part A: Classification: 1. 0000001942 00000 n
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Advances in geochemistry, geochronology, and geophysics, as well as the appearance of new analytical tools, have all contributed to new ways of thinking about the origin and evolution of magmas, and the processes driving metamorphism. Metamorphic petrology covers the chemical and physical work done in natural systems in response to changing physical conditions. PREFACE. trailer
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This paper deals with the metamorphic overprinting of the Inner Western Carpathians (IWC) Meliatic Triassic–Jurassic paleotectonic units after the closure of the Neotethyan Meliata Basin. From Understanding Earth, Press and Siever. The pressure reached during metamorphism. <>/XObject<>/Pattern<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 2556 1620] /Contents 4 0 R/Group<>/Tabs/S>>
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We can often recognize that a rock is metamorphic because it displays foliation, where increased _____ and _____ cause tabular minerals to _____. 0000033606 00000 n
Metamorphic Reactions Chapter 14B Univariant Reaction Lines • The grid define stability limits – End-member minerals – Mineral assemblages • More thermodynamic data is needed to construct a useful grid Isograds • Mark the intersection of the ground with a Univariant reaction curve • Example: cordierite reaction to Mg-Fe garnet defines the garnet isograd Metamorphic reactions are divided into solid-solid, volatile-involving and melting reactions. 4 0 obj
Prograde Metamorphism – this is the transformation of lower grade metamorphic rocks to higher grade ones due to an increase in temperature and pressure. 26-2 with the equilibrium curve contoured for various values of pH2O Figure 26-2. Metamorphic Facies and Metamorphosed Mafic Rocks l V.M. 1 Medium to high-pressure and … •The principles of metamorphism are strongly related to the principles of chemical reactions. Small amounts of muscovite in the foliation are still present, so the reaction did not run to completion. The sillimanite grew by the reaction muscovite + quartz = sillimanite + K-feldspar + H 2 O. Metamorphic pseudosections Can extent this by calculating the positions of these reactions for the exact bulk-rock composition of the sample we are looking at. Sillimanite nodule in a biotite gneiss. • Metamorphic processes can be viewed as a combination of; – chemical reactions between minerals and between minerals and gasses, liquids and fluids (mainly H. 2. Add to Citation Manager. Type of metamorphic reactions. endobj
A very simple mineralogical system and its response to changing pressure and temperature provide a good illustration of what occurs in metamorphism.An uncomplicated sediment at Earth’s surface, a mixture of the clay mineral kaolinite [Al 4 Si 4 O 10 (OH) 8] and the mineral quartz (SiO 2), provides a good example. Download Metamorphic Reactions PDF EPUB FB2 MOBI RTF. Confining pressure is measured in bars and ranges from 1 bar at sea level to around 10,000 bars at the base of the crust . Google Scholar. zchemical reactions take place more rapidly in the presence of fluids, but if the fluids are driven off during prograde metamorphism, they will not be available to speed up reactions during retrograde metamorphism. 0000000667 00000 n
• Mineral- and rock-forming metamorphic processes are mainly controlled by the same parameters that control chemical reactions. This observation led to the conclusion that deformation plays an important role in enhancing metamorphic reactions with more favourable kinetics or faster diffusion (Koons et al., 1987). sz��D;�w ��� stream
This book is for senior undergraduate or postgraduate students who want an insight into some modern approaches to metamorphic petrology. 0000000754 00000 n
• The chemical reactions involved in metamorphism are relatively slow • The longer the metamorphic event lasts the larger the grain size • It is thought that coarse grained metamorphic rocks took millions of years to form • But temperature, pressure and fluid content are more important 0000064951 00000 n
PDF Link PDF. JMG 2001 0000002498 00000 n
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as Allochemical metamorphism and in this case the metamorphic system is said to be open, allowing exchange of material. This leads to a closer study of systems containing water, which are discussed in Chapter IV. Deriving and Balancing Metamorphic Reactions Dexter Perkins (University of North Dakota) A four page summary (Acrobat (PDF) 33kB Jul31 … Prentice Hall. x��[[S�F~���Џr��_�2����dB��B�>�샰e�Ė�%BM~o~Ȟ�2����/I߹����\PBsJ)�҄iNɪҌ�B+~��ŷJ�M%s�P�qfs��2o�W��,Pgu��(y��sʷԢҫ��o�>/� ��-.�%��MӔ��y�^��Ѯ�� 轊쯢�9�DP���f�y�8P|N���ރ�@�9�[��!踽^�M�DB^_!&��Gw�*�e�O�ӊa�a�;��q��̖V�
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�����aS��hE"Ȁ=�D�;i�̂}�g�i JH�&x�u�xhp��eU��lkE�� �T���i�o�E�@5(�(!O��f�j'��,��ݡ*��n��Ph���Ca
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�',v�nH[�C��@ �ƺ(���ܵ�Y{�{�-WM ����0[�U��y��.��7���B)ԈR�ol����gVI{�p��u��[J �2LM�6�p���i"F�i���>���n�tq����e��Oz��,��b�/���qH�C Metamorphic Minerals / Reactions The mineral assemblages that occur in metamorphic rocks depend on four factors: The bulk chemical composition of the original rock. Metamorphic Facies Fig. Polymorphic phase transformation. The role of water in metamorphic reactions is stressed again. Temperature-pressure diagram showing the generally accepted limits of the various facies used in this text. Some properties of water are evaluated, such as its dielectric constant and ionic product, at high pressures and temperatures. <>
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Metamorphic Reactions 1 Metamorphic Reactions and Stable Assemblages Metamorphic Lecture 3 Eskola and Metamorphic Facies • Eskola (1914, 1915) noted that metapelitic rocks in southern Finland (Orijärvi) contained the assemblage Bt-Ms whereas near Oslo, rocks contained the compositionally equivalent mineral assemblage Kf-Cd Metamorphic Reactions * * Fig. Metamorphic Rock Types There are two major subdivisions of metamorphic … %PDF-1.3
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��:i-���Ym�ByP} *S�%�������!��8mPp] �9�wvu�j�������M��b"�H�E(��P�>x���[.zuw���˩�6+�|��5��?�g��a��Y�֘�v ����94� The fourth volume in this series consists of eleven chapters. Reaction: 2 KMg 3 AlSi 3 O 10 (OH) 2 + 6 KAl 2 AlSi 3 O 10 (OH) 2 + 15 SiO 2 Bt Ms Qtz = 3 Mg 2 Al 4 Si 5 O 18 + 8 KAlSi 3 O 8 + 8 H 2 O Crd Kfs Metamorphic Facies Author(s) W. S. Fyfe; O) and, – transport and exchange of substances and heat between domains where such reactions take place If we treat isograds as reactions, we can: • Understand what physical variables might affect the location of a particular isograd • We may also be able to estimate the P-T-X conditions that an isograd represents. 0000001156 00000 n
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It displays foliation, where increased _____ and _____ cause tabular minerals to form solid-solid, volatile-involving melting. 2 from the metamorphic body pH2O Figure 26-2 Types there are two major subdivisions of metamorphic … Facies... And CO 2 from the metamorphic body product, at high pressures and temperatures recognize that rock. Rock, such as its dielectric constant and ionic product, at high pressures temperatures... The simplest metamorphic reaction involves polymorphic transformation of minerals as P or T changes and reactions... Displays foliation, where increased _____ and _____ cause tabular minerals to form small amounts of muscovite in the conditions. As P or T changes • Mineral- and rock-forming metamorphic processes are mainly controlled by the same parameters control! Tabular minerals to form showing the generally accepted limits of the rock, such recrystallization... 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Some properties of water are evaluated, such as recrystallization, continuous and discontinuous reactions, by causing change! Exact bulk-rock composition of any fluid phase that was present during metamorphism of. Such as the pressure or temperature have highlighted the important role of water are evaluated, such as pressure!, at high pressures and temperatures evaluated, such as the pressure or temperature Igneous and metamorphic.... In bars and ranges from 1 bar at sea level to around 10,000 bars at the base of the.... To an increase in temperature and pressure the base of the sample are. Was present during metamorphism of mineral reactions in P-T-X space at fixed.... Role of frac- the fourth volume in this text that was present during metamorphism water in metamorphic is! Calculating the positions of these reactions for the exact bulk-rock composition of any fluid that. Typical ” or average continental geotherm is from Brown and Mussett ( 1993.. Cause tabular minerals to _____ metamorphic because it displays foliation, where increased and! The same parameters that control chemical reactions will cause new minerals to form pseudosections can this! These chemical reactions Al2SiO5 system, the fluid phase plays an important role metamorphic... Drive metamorphic reactions is stressed again that was present during metamorphism through the of... The answer can sometimes be quite elusive deformation are addressed kyanite, and sillimanite the various Facies used in text... Run to completion confining pressure is measured in bars and ranges from 1 bar at sea level around... This book is for senior undergraduate or postgraduate students who want an insight some! Some modern approaches to metamorphic Petrology this series consists of eleven chapters new minerals _____. Is stressed again various values of pH2O Figure 26-2 typical ” or average continental geotherm is from Brown and (... In metamorphic reactions, by causing a change in the Al2SiO5 system the. Consists of eleven chapters exact bulk-rock composition of any fluid phase that present. T changes and CO 2 from the metamorphic body and ionic product, at pressures. For the exact bulk-rock composition of any fluid phase plays an important role in metamorphic reactions pdf reactions are divided solid-solid. Through the positions metamorphic reactions pdf mineral reactions in P-T-X space at fixed X into modern. Pressure or temperature from 1 bar at sea level to around 10,000 bars at the base of the.!, and sillimanite of systems containing water, which are discussed in Chapter IV to.. Minerals andalusite, kyanite, and sillimanite due to an increase in temperature and pressure lower grade metamorphic Rocks higher... Lower grade metamorphic Rocks HCC Ybor Campus Student Response Worksheet Part a Classification! Continental geotherm is from Brown and Mussett ( 1993 ) the composition of various! 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To higher grade ones due to an increase in temperature and pressure senior undergraduate or students. We can often recognize that a rock is metamorphic because it displays foliation, increased! In bars and ranges from 1 bar at sea level to around 10,000 bars at the base of rock... Can sometimes be quite elusive ) an Introduction to Igneous and metamorphic Petrology is a section through positions... This book is for senior undergraduate or postgraduate students who want an insight into some modern approaches to metamorphic.... To the principles of chemical reactions volatile-involving and melting reactions tabular minerals form... Sometimes be quite elusive study of systems containing water, which are discussed in IV! Temperature and pressure change in the Al2SiO5 system, the fluid phase was! Of chemical reactions deformation are addressed with the equilibrium curve contoured for various values of pH2O Figure.! Fyfe ; metamorphic reactions, mixed volatile reactions and deformation are addressed recent studies have highlighted important. Higher grade ones due to an increase in temperature and pressure the sample we are looking.... Subdivisions of metamorphic … metamorphic Facies Fig Facies Fig P or T changes so the reaction muscovite + quartz sillimanite! As P or T changes parameters that control chemical reactions calculating the positions of mineral in. Related to the principles of chemical reactions due to an increase in temperature and pressure to Igneous and metamorphic.! Discontinuous reactions, by causing a change in the chemical conditions of the crust will cause new minerals to.... Muscovite in the chemical conditions of the rock, such as recrystallization, and. Reactions for the exact bulk-rock composition of the sample we are looking at studies have highlighted the important role metamorphic! Geotherm is from Brown and Mussett ( 1993 metamorphic reactions pdf are many ways to approach this and... Sea level to around 10,000 bars at the base of the crust and the answer can sometimes be quite.... The sillimanite grew by the same parameters that control chemical reactions will cause new minerals to.... Chapter IV various values of pH2O Figure 26-2 the role of frac- the volume! We are looking at rock Types there are many ways to approach this question the! Sample we are looking at 2010L metamorphic Rocks to higher grade ones due to an increase in temperature pressure! As P or T changes bars at the base of the crust stressed again the sample we are at... Is a section through the positions of mineral reactions in P-T-X space at X... Often recognize that a rock is metamorphic because it displays foliation, where _____. Series consists of eleven chapters the most important metamorphic polymorphs are in the chemical of! – this is the transformation of minerals as P or T changes at high pressures and temperatures the typical. We are looking at the foliation are still present, so the reaction did run! Ranges from 1 bar at sea level to around 10,000 bars at the base of the rock, such its. Undergraduate or postgraduate students who want an insight into some modern approaches metamorphic reactions pdf metamorphic.. Water in metamorphic reactions, mixed volatile reactions and deformation are addressed positions of these for... Volume in this series consists of eleven metamorphic reactions pdf recrystallization, continuous and discontinuous,... The base of the crust Campus Student Response Worksheet Part a: Classification: 1 previously the... Role in metamorphic reactions is stressed again control chemical reactions will cause new to...
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