Orientation . The driving forces for metamorphism are changes in temperature,pressure,and compo- sition of pore fluids. 22. The relict structure may be use d to trace back the nature of the original rock and the magnitude of alteration it has undergone. • Phyllosilicates accommodate better shear • Other minerals dissolve due to high shear. Just like in igneous rocks, minerals can only form if the necessary chemical constituents are present in the rock (i.e. In this chapter the methods used to draw field sketches of complex structures in metamorphic rocks are described. Scheme for Metamorphic Rock Identification MAP SYMBOL TYPE OF COMPOSITION METAMORPHISM COMMENTS Low-g rade metamorphism of shale Foliation surfaces shiny from microscopic mica cry stals Platy mica crystals visible from metamorphism of clay or feldspars High-grade metamorphism; mineral types segregated into bands Metamorphism of bituminous coal Various rocks changed by … Based on the mineral assemblage present in the rock one can often estimate the approximate bulk chemical composition of the rock. Slate. 0000003246 00000 n This chapter describes different types … 2. ����6UW;}������- |�[�q!Ө��P���9����Ot(�oV9�|�|bu �2�E@���z��l�Q�,o���3�3p4���T��g��S�3?�g��2�Ae"��i?���X�Ŭ�Üw���/������ƥS�(w�V��yܟ��N! Exposure to these extreme conditions has altered the mineralogy, texture, and chemical compositionof the rocks. Chapter PDF Available Geology, Structural, Metamorphic and Mineralization Studies Along the Mandi-Kullu-Manali-Rohtang Section of Himachal Pradesh, NW-India December 2020 endstream endobj 400 0 obj <>stream The three major classes of rock are igneous, sedimentary, and metamorphic rock. A lithology field in a geoscience database is a place for classification of the constituents used to describe bodies of rock. Metamorphic rock names have traditionally had their basis in one or more of 4 attributes: texture, composition, precursor lithology (protolith) and metamorphic grade. a. Two examples of metamorphic rock descriptions are medium-grained, hornblende-biotite schist, or fine- to medium-grained, garnetiferous, muscovite-chlorite-feldspar-quartz gneiss. • Look at several protoliths to determine facies. A thorough presentation on characteristics and description of all main types of metamorphic rocks. Most metamorphic processes take place deep underground, inside the earth’s crust. Geology Laboratory: Metamorphic Rocks Revised on 10/8/2012 Page 2 of 9 Igneous rocks form from magma, which is not a rock (since it is a fluid) and sedimentary rocks lithify from loose sediment or precipitate from a solution. In the first way, sandstone or chert recrystallizes resulting in a metamorphic rock under the pressures and temperatures of deep burial. IV Fabrics: grain-scale structure (metamorphic rocks & igneous rocks) A Foliation: preferred alignment of minerals (e.g., mica) parallel to a plane; B Lineation: preferred alignment of minerals parallel to a line; GG 612 February 28, 2008 6. �r��H�yG����� Lineation is one of the most significant fabric elements and it should be included in all complete structure maps. O�,d�A�.�uݠ��a �o�b%\0����Ic Z'p}�a�Zq���5��u�|� �f#dc4u*��9����O��_��aʟ��M0r�"���.�%�3AQ׍��%�rwFC��뵨 z�L���'R�L]�S�ڱVԶc�3SP=�d����JK?�y�D�����Te=��v�tI#�m��wv�q�l3���&�(��>N��`A��f��+��ĘR�؊��t��Π��9x!���Yx�ٔ�eQ�ߔ>�� ��!�'+�p�S]�w|w�bI��fM��,�+C��t�Eqa�أas۩�S�4=�W��������@������u�͈��>*�v��P33����rq�/��H�;�+|�o��6��r�gM����໢�qzt�s�˺�/�� �uө 0 Contact metamorphism zones can be a few centimeters to several kilometers, especially around large plutons. endstream endobj 20 0 obj<. startxref Structure terms • amygdule: round cavities !lled with late minerals, esp. Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. A1. • Migrate to low shear area, where porphyroblasts form. 1. Metamorphic Rocks Presentation - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. 0000006052 00000 n GG 612 February 28, 2008 10. The nomenclature of metamorphic rocks is classified according to various criteria, especially texture, composition, and P–T conditions of metamorphism. that analyze the complete description structure. The outstanding feature of the 7th edition of this book is the large number of phase diagrams showing the stability relations among minerals and groups of minerals found in metamorphic rocks. Deposition, 4. Foliation in geology refers to repetitive layering in metamorphic rocks. • Look at several protoliths to determine facies. Foliated Metamorphic Rocks. Know: Apply. ]'g���d���D��ky(v[��d(��g�uM��ੌKH+6���O���:E�6�+��[g�F~Nw\� wK/),9a%K�TV�� �t|��Ftj.������������J� A���e��E�q��ZH�J���p�U-n�)�U�8E q�㮌���3.�+�?��^�o]��^�l��U�Dv�ϝ�L~Hc'i� �O���S�l�&Cc%�1Ih���Ҕ���"� A metamorphic rock used to be some other type of rock, but it was changed inside the Earth to become a new type of rock. Yet, this empirical rule may be in need of revision. Chapter 3 SEDIMENTARY STRUCTURES 1. • Identify major minerals contained within a metamorphic rock. Only the Earth’s outer core is liquid; the Earth’s mantle and crust is naturally solid. The structures and textures of metamorphic rocks arise during the recrystallization in the solid state of primary sedimentary and magmatic rocks. Metamorphic Rocks When the pre existing rocks buried deep below the Earth's surface, they modified by heat, pressure and other chemical processes without melting. Foliation in geology refers to repetitive layering in metamorphic rocks. 0000006822 00000 n • Facies represent specific temperature - pressure regimes. 0000003550 00000 n • Suggest possible parents for a given metamorphic rock. When erosion takes place, the overlying strata gradually disappear, ultimately exposing plutonic rocks on the surface. %PDF-1.6 %���� • Facies concept developed by Eskola (Norway, 1915) to compare metamorphic rocks from different areas. The attitude of a linear structure … Gneissose structure • Either a poorly-developed schistosity or segregated into layers by metamorphic processes • Gneissose rocks are generally coarse grained . This is the effect of erosion over rocks formed at a depth. 3. 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