The pressure reached during metamorphism. 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 0000001303 00000 n Some properties of water are evaluated, such as its dielectric constant and ionic product, at high pressures and temperatures. as Allochemical metamorphism and in this case the metamorphic system is said to be open, allowing exchange of material. 0000000981 00000 n 0000000754 00000 n All papers deal with natural processes that O) and, – transport and exchange of substances and heat between domains where such reactions take place <> Metamorphic Rock Types There are two major subdivisions of metamorphic … Chapter 26: Metamorphic Reactions. We can often recognize that a rock is metamorphic because it displays foliation, where increased _____ and _____ cause tabular minerals to _____. 0000002498 00000 n endobj Small amounts of muscovite in the foliation are still present, so the reaction did not run to completion. PDF Link PDF. trailer << /Size 48 /Info 31 0 R /Root 33 0 R /Prev 524173 /ID[] >> startxref 0 %%EOF 33 0 obj << /Type /Catalog /Pages 20 0 R /JT 30 0 R /PageLabels 19 0 R >> endobj 46 0 obj << /S 98 /L 151 /Filter /FlateDecode /Length 47 0 R >> stream 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). 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� #7���нg�I�4���R��@+ E�'$>1��eQ\���-Ɏ`F��tVu�pJ���l��߽u�7fMn5*���P�T��{Rn���>�5�E�^Sx��1:��r^����~����2���*��O�Q�C4"S4�F��C�Z�0sO�K� ������V}, �+��*���vٗ�9�����=Y�6:��2��&�����dO�tb��2�ɩT�UO�vV�d1�W%��+����AV�1^���ߪ�Y�� �����Y"�u;�Y��f'^��3j=�2}�>�����?��*�dr ���{�@�^;����_i��:��w��KZ(wrK0r�t�@�:�~j��%�è���@�E�!73�������u����y���{�|?�ѡ�(ۓ���y"3dP��H/���p�.�����|A����s����lV�y��W�y ��D�.��\u��Hp��i:�4�P!c%b LM�q|�2X1a���$Ą�Q�һUXd�/�Ѕ�^{����~�"5�L�b�3��b�i|�.Hs����k����+��g�/GM.��%_V�s���I5��+�/��;3���[����� �;��(���z�ҥ/=�x�N� �L�c�y�4�\��-h���+,X�������xe���OK(�f 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 As we discussed previously, the fluid phase plays an important role in metamorphic reactions. 0000002718 00000 n • Mineral- and rock-forming metamorphic processes are mainly controlled by the same parameters that control chemical reactions. <>/XObject<>/Pattern<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 2556 1620] /Contents 4 0 R/Group<>/Tabs/S>> 3�< F �k >Fmԣ�v���0֢�3�-Vg{��d�� W���\�I���=CCT�ag�����^R,��n=L�\�k�:�d�����ԁ\ ��Xf";��-����1HFbb=Τ�׾�bY(cá�����L�C�� ,�8/��۫��R|B��3 )� The most important metamorphic polymorphs are in the Al2SiO5 system, the minerals andalusite, kyanite, and sillimanite. 25.2. The role of water in metamorphic reactions is stressed again. 12 Guiraud et al. 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. Polymorphic phase transformation. Petrogenetic processes such as recrystallization, continuous and discontinuous reactions, mixed volatile reactions and deformation are addressed. Deriving and Balancing Metamorphic Reactions Dexter Perkins (University of North Dakota) A four page summary (Acrobat (PDF) 33kB Jul31 … Boundaries are approximate and gradational. drive metamorphic reactions, by causing a change in the chemical conditions of the rock, such as the pressure or temperature. endobj 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: [email protected] 2 Instiute of Geological Sciences, Free University Berlin, Malteserstr. �@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� Add to Citation Manager. 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. 0000005080 00000 n More recent studies have highlighted the important role of frac- Metamorphic Minerals / Reactions The mineral assemblages that occur in metamorphic rocks depend on four factors: The bulk chemical composition of the original rock. Not only are fluid components necessary to form any hydrous or carbonate minerals, but the fluid phase can act as a catalyst for metamorphic reactions. ��梟��qd.�x����2\ŕz3?�Ri�.Ԇ�F��٘:R�-�}P�x�p�.�h*�`9hdL)X��� �e�H;�Xn�q�)e�.�i�b���#��pD4y�f��l�uXÚ ȋ{�tu�. 1 PREFACE. Download Metamorphic Reactions PDF EPUB FB2 MOBI RTF. This is called a pseudosection. %PDF-1.3 %���� 26-2 with the equilibrium curve contoured for various values of pH2O Figure 26-2. There are many ways to approach this question and the answer can sometimes be quite elusive. 1 0 obj 0000001942 00000 n 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 • 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 The simplest metamorphic reaction involves polymorphic transformation of minerals as P or T changes. Metamorphic Facies Fig. 2. 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 <> • In other words , A metamorphic reaction is a chemical reaction that takes place during the geological process of metamorphism wherein one metamorphic minerals is commonly localized in shear zones. GLY 2010L Metamorphic Rocks HCC Ybor Campus Student Response Worksheet Part A: Classification: 1. 0000001002 00000 n Rn�'���[�m�#��K��;��1Z�#��9��N����B��$����׾K^~�-��o(e���!H�&�O�(�rr�vr�J��e�=ƀ5�S/Pg7�"��=����y[���%_��iy�����=���sБ�r�+_fp�b��S���������t,4ð���|�.�g�tp�jK����2�1��ʩ�}nB'/���.�ȳ��V��j��C1�:�4wH�V�"6V8�S�ëy�n)��2�O��FP��DbmMĀAf��c�끍m��ŀ-���X�ے�\ q`�-[ɻ��3C������Xțt�yk� �����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 4���o����R:p��� &L�B��+��yW���v�^�c� �',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 JMG 2001 Metamorphic Reactions and Metamorphic Facies Author(s) W. S. Fyfe; W. S. Fyfe Search for other works by this author on: GSW. Medium to high-pressure and … Metamorphic evolution of an accretionary wedge can be constrained by a reconstructed P–T conditions of the oceanic and continental margin fragments. Prograde reactions liberate H 2 O and CO 2 from the metamorphic body. stream 3 0 obj Metamorphic reactions Reactions in a kaolinite-quartz system. F. J ... PDF Link PDF. • Metamorphic processes can be viewed as a combination of; – chemical reactions between minerals and between minerals and gasses, liquids and fluids (mainly H. 2. 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? Metamorphic petrology covers the chemical and physical work done in natural systems in response to changing physical conditions. Metamorphic reactions are divided into solid-solid, volatile-involving and melting reactions. Google Scholar. Author(s) W. S. Fyfe; H�\U T����{��A� ��� �@pA�-2���ckQ� ��`�rܫ5�� ��h0�F�iH��5.Qm�[��*GQ��(������˘�$����y�}�}������W ����~�Ge�5�jzNavQ���d�:��s[�}�y����/�Q����g���sOG}�؝�g�x!`��N�7��a�ŋ����. Temperature-pressure diagram showing the generally accepted limits of the various facies used in this text. Igneous and metamorphic petrology has over the last twenty years expanded rapidly into a broad, multifaceted and increasingly quantitative science. 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. 0000002970 00000 n H����?�pi��8b��Vhu,�j$1��[�yU��f�;�c������N�Du89P�,Fg�m�:b!��WwB�4F������o6��q��֓��������n�b^4�ȼX͎[� The temperature reached during metamorphism. �����D��M���5���G�Ysܱy�[�Y Most metamorphic petrologists agree that the simplicity of patterns observed during dehydration reactions of noncarbonate sediments and loss of CO 2 from highly calcareous sediments suggests that partial pressures of the dominant gases and total pressures (load pressure) acting in the system are not completely independent. Add to Citation Manager. Metamorphic Facies and Metamorphosed Mafic Rocks Reading: Winter Chapter 25. This leads to a closer study of systems containing water, which are discussed in Chapter IV. The first five deal with more theoretical aspects of the kinetics and mechanisms of meta­ morphic reactions, and the next six consider the interdependence of defor­ mation and metamorphism. endstream endobj 42 0 obj << /Filter /FlateDecode /Length 28435 /Length1 45936 >> stream Prograde Metamorphism – this is the transformation of lower grade metamorphic rocks to higher grade ones due to an increase in temperature and pressure. Confining pressure is measured in bars and ranges from 1 bar at sea level to around 10,000 bars at the base of the crust . uR�E �L�*y~ ���m�|H.n��?���ȇ����?��U��j#r�-h��g�ͽ�ԁ=�[�uɲ&9h=o�<>� ���N2k���S=h�/�A�{�M�{�\wB "u*��&8�[email protected]�Yן${���7gn ��:i-���Ym�ByP} *S�%�������!��8mPp] �9�wvu�j�������M��b"�H�E(��P�>x���[.zuw���˩�6+�|��5��?�g��a��Y�֘�v ����94� 0000002931 00000 n %���� H��W�r۶}�W���D� �L�$�����yH�@K��F]����F/���eI��LG�� ���k/�x]2� ��z���撓�z�ͤ ZJj� �8j�!�q��%�]����^L&;'�#n�����z�4UFqb2M��}�1j�$���cFc�L����LFɅo�EY��S�_�O��\�����f��H�5y��.�i��l]��\0����Q&�j}�28�B��}��6�K ͒�W����_&ߏ�N��7#N�G~ ~hGg䂼����T� ���r"�Ư���J��\^�� endobj 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. <> It is a section through the positions of mineral reactions in P-T-X space at fixed X. 2 0 obj 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. sz��D;�w ��� 32 0 obj << /Linearized 1 /O 34 /H [ 754 248 ] /L 524941 /E 67776 /N 4 /T 524183 >> endobj xref 32 16 0000000016 00000 n 0000000667 00000 n Type of metamorphic reactions. 4 0 obj 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. [�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���= ��{� 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.. The “typical” or average continental geotherm is from Brown and Mussett (1993). Metamorphic Reaction Mechanisms. Contents. Metamorphic processes also commonly drive deformation. Sillimanite nodule in a biotite gneiss. 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. Winter (2010) An Introduction to Igneous and Metamorphic Petrology. 0000033745 00000 n 0000064951 00000 n Metamorphic Reactions * * Fig. This book is for senior undergraduate or postgraduate students who want an insight into some modern approaches to metamorphic petrology. From Understanding Earth, Press and Siever. 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