Prograde reactions liberate H 2 O and CO 2 from the metamorphic body. 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 . as Allochemical metamorphism and in this case the metamorphic system is said to be open, allowing exchange of material. Metamorphic Reactions and Metamorphic Facies Author(s) W. S. Fyfe; W. S. Fyfe Search for other works by this author on: GSW. Chapter 26: Metamorphic Reactions. Temperature-pressure diagram showing the generally accepted limits of the various facies used in this text. These chemical reactions will cause new minerals to form. 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. 26-2 with the equilibrium curve contoured for various values of pH2O Figure 26-2. • Metamorphic processes can be viewed as a combination of; – chemical reactions between minerals and between minerals and gasses, liquids and fluids (mainly H. 2. 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 This leads to a closer study of systems containing water, which are discussed in Chapter IV. Prentice Hall. The composition of any fluid phase that was present during metamorphism. 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. <>/XObject<>/Pattern<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 2556 1620] /Contents 4 0 R/Group<>/Tabs/S>> 0000005080 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 H�b```f``�������� Ā B@1��hw�� L�>̞ �a5Q;۵S�5c�R��]{8:@D��T�������b>�����7P[����!~��q��K60:�i +�g`��� �(O endstream endobj 47 0 obj 136 endobj 34 0 obj << /Type /Page /Parent 20 0 R /Resources 35 0 R /Contents 41 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 35 0 obj << /ProcSet [ /PDF /Text ] /Font << /TT2 37 0 R /TT4 36 0 R >> /ExtGState << /GS1 43 0 R >> /ColorSpace << /Cs6 40 0 R >> >> endobj 36 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 186 /Widths [ 250 0 0 0 0 0 0 0 333 333 0 564 250 333 0 0 500 500 500 500 500 500 500 500 0 500 0 0 0 564 564 0 0 722 667 667 722 0 556 722 722 333 0 722 611 889 722 722 556 722 0 556 611 722 0 944 722 0 0 0 0 0 0 0 0 444 500 444 500 444 333 500 500 278 0 500 278 778 500 500 500 500 333 389 278 500 500 722 500 500 444 0 0 0 541 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 444 444 350 500 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 400 0 0 0 0 0 0 0 0 0 310 ] /Encoding /WinAnsiEncoding /BaseFont /CEFEDI+TimesNewRoman /FontDescriptor 39 0 R >> endobj 37 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 148 /Widths [ 250 0 0 0 0 0 0 0 333 333 0 570 250 333 0 0 500 500 500 500 500 500 0 0 500 0 333 0 0 570 0 0 0 722 667 722 722 667 611 778 778 389 0 778 667 944 722 778 611 0 722 556 667 722 0 1000 0 0 667 0 0 0 0 0 0 500 556 444 556 444 333 500 556 278 0 556 278 833 556 500 556 556 444 389 333 556 500 722 500 500 444 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 500 500 ] /Encoding /WinAnsiEncoding /BaseFont /CEFEAP+TimesNewRoman,Bold /FontDescriptor 38 0 R >> endobj 38 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 0 /Descent -216 /Flags 34 /FontBBox [ -558 -307 2034 1026 ] /FontName /CEFEAP+TimesNewRoman,Bold /ItalicAngle 0 /StemV 133 /FontFile2 42 0 R >> endobj 39 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 0 /Descent -216 /Flags 34 /FontBBox [ -568 -307 2028 1007 ] /FontName /CEFEDI+TimesNewRoman /ItalicAngle 0 /StemV 0 /FontFile2 44 0 R >> endobj 40 0 obj [ /ICCBased 45 0 R ] endobj 41 0 obj << /Length 2035 /Filter /FlateDecode >> stream 0000002498 00000 n PDF Link PDF. Metamorphic petrology covers the chemical and physical work done in natural systems in response to changing physical conditions. 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 temperature reached during metamorphism. •The principles of metamorphism are strongly related to the principles of chemical reactions. 0000001303 00000 n The simplest metamorphic reaction involves polymorphic transformation of minerals as P or T changes. �����D��M���5���G�Ysܱy�[�Y As we discussed previously, the fluid phase plays an important role in metamorphic reactions. Medium to high-pressure and … 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. �@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� stream Prograde metamorphic reactions. metamorphic minerals is commonly localized in shear zones. 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. 12 Guiraud et al. F. J ... PDF Link PDF. 4 0 obj 2. Metamorphic Facies and Metamorphosed Mafic Rocks Reading: Winter Chapter 25. H����?�pi��8b��Vhu,�j$1��[�yU��f�;�c������N�Du89P�,Fg�m�:b!��WwB�4F������o6��q��֓��������n�b^4�ȼX͎[� • Mineral- and rock-forming metamorphic processes are mainly controlled by the same parameters that control chemical reactions. 1 Not only are fluid components necessary to form any hydrous or carbonate minerals, but the fluid phase can act as a catalyst for metamorphic reactions. Metamorphic Rock Types There are two major subdivisions of metamorphic … This is called a pseudosection. Add to Citation Manager. A very simple mineralogical system and its response to changing pressure and temperature provide a good illustration of what occurs in metamorphism.An uncomplicated sediment at Earth’s surface, a mixture of the clay mineral kaolinite [Al 4 Si 4 O 10 (OH) 8] and the mineral quartz (SiO 2), provides a good example. endobj Metamorphic evolution of an accretionary wedge can be constrained by a reconstructed P–T conditions of the oceanic and continental margin fragments. For metamorphic rocks, pressures range from a relatively low-pressure of 3,000 bars around 50,000 bars , which occurs around 15-35 kilometers below the surface. GLY 2010L Metamorphic Rocks HCC Ybor Campus Student Response Worksheet Part A: Classification: 1. Deriving and Balancing Metamorphic Reactions Dexter Perkins (University of North Dakota) A four page summary (Acrobat (PDF) 33kB Jul31 … %PDF-1.5 PREFACE. This observation led to the conclusion that deformation plays an important role in enhancing metamorphic reactions with more favourable kinetics or faster diffusion (Koons et al., 1987). Contents. Rn�'���[�m�#��K��;��1Z�#��9��N����B��$����׾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 25.2. Igneous and metamorphic petrology has over the last twenty years expanded rapidly into a broad, multifaceted and increasingly quantitative science. 0000001002 00000 n Metamorphic Facies and Metamorphosed Mafic Rocks l V.M. JMG 2001 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.. 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. • In other words , A metamorphic reaction is a chemical reaction that takes place during the geological process of metamorphism wherein one Author(s) W. S. Fyfe; Prograde Metamorphism – this is the transformation of lower grade metamorphic rocks to higher grade ones due to an increase in temperature and pressure. [�S�9VpF�N���Uu�w��2�����Ak������n��C�e5+|U4~� iJrq3�ړ�p�ᙾ]t�M^-}���"��" �V�}$B"�V�l�#����j������/����J��SZ,�cX��~�I��*��~QG���=��đ��s*�{�ukv�R�ӏ5���= ��{� 0000000754 00000 n endobj 0000033745 00000 n The fourth volume in this series consists of eleven chapters. 0000000981 00000 n Some properties of water are evaluated, such as its dielectric constant and ionic product, at high pressures and temperatures. 0000000667 00000 n %PDF-1.3 %���� 0000033606 00000 n Add to Citation Manager. Small amounts of muscovite in the foliation are still present, so the reaction did not run to completion. 0000002931 00000 n 2 0 obj Metamorphic Minerals / Reactions The mineral assemblages that occur in metamorphic rocks depend on four factors: The bulk chemical composition of the original rock. Polymorphic phase transformation. • The chemical reactions involved in metamorphism are relatively slow • The longer the metamorphic event lasts the larger the grain size • It is thought that coarse grained metamorphic rocks took millions of years to form • But temperature, pressure and fluid content are more important <> Metamorphic Reaction Mechanisms. uR�E �L�*y~ ���m�|H.n��?���ȇ����?��U��j#r�-h��g�ͽ�ԁ=�[�uɲ&9h=o�<>� ���N2k���S=h�/�A�{�M�{�\wB "u*��&8�i@�Yן${���7gn ��:i-���Ym�ByP} *S�%�������!��8mPp] �9�wvu�j�������M��b"�H�E(��P�>x���[.zuw���˩�6+�|��5��?�g��a��Y�֘�v ����94� 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 Boundaries are approximate and gradational. endstream endobj 42 0 obj << /Filter /FlateDecode /Length 28435 /Length1 45936 >> stream The pressure reached during metamorphism. 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 endobj Download Metamorphic Reactions PDF EPUB FB2 MOBI RTF. <> 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. drive metamorphic reactions, by causing a change in the chemical conditions of the rock, such as the pressure or temperature. The “typical” or average continental geotherm is from Brown and Mussett (1993). Metamorphic processes also commonly drive deformation. 0000064951 00000 n More recent studies have highlighted the important role of frac- ��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�. 0000002970 00000 n Metamorphic Reactions * * Fig. Winter (2010) An Introduction to Igneous and Metamorphic Petrology. 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 1 0 obj 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. %���� O) and, – transport and exchange of substances and heat between domains where such reactions take place All papers deal with natural processes that Type of metamorphic reactions. 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. Petrogenetic processes such as recrystallization, continuous and discontinuous reactions, mixed volatile reactions and deformation are addressed. <> 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 3 0 obj sz��D;�w ��� The role of water in metamorphic reactions is stressed again. This book is for senior undergraduate or postgraduate students who want an insight into some modern approaches to metamorphic petrology. Google Scholar. Sillimanite nodule in a biotite gneiss. 0000001942 00000 n From Understanding Earth, Press and Siever. 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? There are many ways to approach this question and the answer can sometimes be quite elusive. Metamorphic Facies Fig. We can often recognize that a rock is metamorphic because it displays foliation, where increased _____ and _____ cause tabular minerals to _____. Metamorphic reactions Reactions in a kaolinite-quartz system. 0000001156 00000 n Freeman. Examples include the production of talc under varied metamorphic conditions: 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 0000002718 00000 n It is a section through the positions of mineral reactions in P-T-X space at fixed X. The most important metamorphic polymorphs are in the Al2SiO5 system, the minerals andalusite, kyanite, and sillimanite. The sillimanite grew by the reaction muscovite + quartz = sillimanite + K-feldspar + H 2 O. Metamorphic reactions are divided into solid-solid, volatile-involving and melting reactions. H�\U T����{��A� ��� �@pA�-2���ckQ� ��`�rܫ5�� ��h0�F�iH��5.Qm�[��*GQ��(������˘�$����y�}�}������W ����~�Ge�5�jzNavQ���d�:��s[�}�y����/�Q����g���sOG}�؝�g�x!`��N�7��a�ŋ����. H��W�r۶}�W���D� �L�$�����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��\^�� Used in this series consists of eleven chapters most important metamorphic polymorphs in... Fyfe ; metamorphic reactions is stressed again as the pressure or temperature the positions of these reactions the! 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