These crystalline changes create identifying textures, which is shown in the figure below comparing the phaneritic texture of igneous granite with the foliated texture of metamorphic gneiss. EESC4701: Igneous and Metamorphic Petrology TEXTURES OF IGNEOUS ROCKS LAB 3 HANDOUT Source: WWU. The subsequent chapters describe the structural classification of grain … The subsequent chapters … Longmans. Help to identify the original rock type prior to metamorphism. Syn-kinematic crystals Figure 23-40. (1990) Atlas of Metamorphic Rocks and their Textures. Video Lecture: Chemographic Projections. Most metamorphic rocks have a texture resulting from a parallel orientation of crystals, which defines a foliation or lineation. Teacher note Identification of metamorphic rocks is difficult because there are so many varieties created by just a wide range of conditions. Metamorphic Textures provides definitions, descriptions and illustrations of metamorphic textures, as well as the fundamental processes involved in textural development. ���}�e�5O_mu!��J[�M�R�E��V��gm�Yь��5�2������źU�s&���wа6í������^,�.�@Na2F82�z.dDgF^���wUH�w�1n�l��Dd��a6�Ô I/�M�-��. This book is composed of 11 chapters and begins with a presentation of the metamorphic processes and the production of metamorphic minerals. Read Online or Download Metamorphic Textures PDF. 1. Pergamon. TEXTURE 1)FOLIATED a) Mineral Alignment: alignment of mineral crystals. endobj Metamorphic textures: Foliation • Planar fabric in metamorphic rocks formed due to directed stresses • Can be defined by planes of weakness (ex. Oxford. Metamorphism and Metamorphic Rocks Definition of Metamorphism The word "Metamorphism" comes from the Greek: meta = after, morph = form, so metamorphism means the after form. From Understanding Earth, Press and Siever. Regional Organisations and the Development of Collective - download pdf or read online. Foliated texture is a pervasive layering caused by compositional layering or by the parallel orientation of platy (e.g, mica) or elongate (e.g., amphibole) mineral grains. 3.11a) – evidence for advanced Metamorphic Scheme ESRT pg.7. 6.2.2: Non-foliated. Students are asked to distinguish foliated and nonfoliated textures to help identification of metamorphic rocks. Metamorphic Fabric and Texture FABRIC: Refers to orientation of the crystallographic lattices of the minerals TEXTURE: Refers to mineral distributions or orientations within the rock, overall structure of the rock. Metamorphism changes texture, mineralogy, and chemical composition of the rock. 4 Chapter 3: Chemographic Diagrams and Chemographic Projections. The major types of foliation are: 1) Slaty cleavage. With this in mind, today's lab focuses on common terms that are used to describe metamorphic rock textures, fabrics, structures They can exhibit a wide range of textures depending on the intensity of metamorphism. metamorphic rocks. Nonetheless, texture is a fundamental attribute of siliciclastic sedimentary rocks. Igneous Metamorphic. Textures and Structures of Metamorphic Rocks 1. After Carmichael (1969). Magnification ~20X. Summarize the progression of different rock types produced by regional metamorphism. This is referred to as Isochemical metamorphism, and the metamorphic system in this case has remained closed. • Deformation fabrics • Coarsening of grain size • Metamorphic minerals may grow and modify rock texture. Texture: Metamorphic rocks may have either foliated (layered) or non-foliated texture. The subsequent chapters describe the structural classification of grain … Metamorphic textures show a great diversity in the size, shape, orientation, and spatial arrangement of crystals, which results from variable P–T conditions during metamorphism. x��T�N1! x��VM��D I�A� ���4MWWWU� !qK4�)�D(i��/�m�{�]�����뽪�s6�@i��Z�����l|��p6ṕ���~z�D9r(4�r����'�o���/OƷ��:u)n��Ay�]��?��O��C�k|��b��l(��=����TNed.j��%)Ę��{�����J �i�N��R�IJ�n�*�*���>�H���w{ Introduction to Petrography -- John Butler, University of Houston; on-line course materials for igneous, sedimentary and metamorphic petrography. This book is composed of 11 chapters and begins with a presentation of the metamorphic processes and the production of metamorphic minerals. "q��Iي�Ut����endstream Types of Foliation Schistosity: Foliation found in Schist due to the alignment of the platy micas. 360 Arrangement of grains into tectonite fabrics (can by purely crystallographic) Textural Terms denoting Tectonite fabric • Foliation: preferred dimensional alignment of mineral grains. Mylonitic Texture Mylonites are rocks that have undergone modification of original textures by predominantly plastic flow due to dynamic recystallization. Metamorphism and Metamorphic Rocks Definition of Metamorphism The word "Metamorphism" comes from the Greek: meta = after, morph = form, so metamorphism means the after form. Chapter 26: Metamorphic Reactions. <> PDF: Metamorphic Triangular Diagrams and Phase Rule . Others have a more isotropic arrangement of mineral grains. How do we identify Metamorphic rocks? �h�%��8��� ;��Ҩ3��"��MA 9a�>�E�զG5W��Y��5O&�ٜ�q�K�` f������ %�쏢 Non-foliated metamorphic rocks are further classified based on their composition. Other kinds of metamorphic rock are named for the kinds of minerals present, the size of the grains and other textures. Syn-kinematic crystals Spiral Si train in garnet, Connemara, Ireland. 21 Table of Contents These samples of phyllite all came from the same quarry in South Carolina. Texture: Metamorphic rocks may have either foliated (layered) or non-foliated texture. Metamorphic Fabric and Texture FABRIC: Refers to orientation of the crystallographic lattices of the minerals TEXTURE: Refers to mineral distributions or orientations within the rock, overall structure of the rock. Metamorphic Textures. FREE PREVIEW. stream Spiral S i train in garnet, Connemara, Ireland. Metamorphism is the process of change that a rock undergoes when exposed to physical and chemical. ISBN-10: 0080133169. As phyllite weathers it parts along the cleavage planes. Metamorphic Textures • Textural classification of metamorphic rocks is based on – 1. 16 0 obj FREE PREVIEW. contact … PDF: Metamorphic Textures. We only emphasize eight rocks, but there are many more varieties (and h). Freeman. Video Lecture: Metamorphic Textures Part 2. Metamorphic rock - Metamorphic rock - Structural features: Metamorphic rocks are often intimately related to large-scale (kilometres of tens of kilometres) structural features of Earth. b) Banding rocks show alternating bands of light and dark color Gneiss . PDF: Metamorphic Triangular Diagrams and Phase Rule . In geology this refers to the changes in mineral assemblage and texture that result from subjecting a rock to pressures and temperatures different from those under which the rock originally formed. Shape of grains – 3. • Processes leading to texture formation • Textures of Contact Metamorphism • High Strain Metamorphic Textures • Regional Metamorphic Textures • Replacement Textures and Reaction Rims 2. Non-foliated textures do not have lineations, foliations, or other alignments of mineral grains. Uplift Metamorphism . Non-foliated are formed as a result of tectonic movements or direct pressure which makes their formation highly dependent on their pre-existing conditions. METAMORPHIC TEXTURES PDF DOWNLOAD METAMORPHIC TEXTURES PDF READ ONLINE post kinematic definition geology texture of metamorphic rock… Video Lecture: Metamorphic Phase Rule and Triangular Diagrams. Phyllite has a satiny appearance and waxy texture. Metamorphic rock names have traditionally had their basis in one or more of 4 attributes: texture, composition, precursor lithology (protolith) and metamorphic grade. The subsequent chapters describe the structural classification of grain … Chapters 5–7 cover textural features that can be attributed to metamorphic reactions more or less in the absence of active deformation. SGL 101: MATERIALS OF THE EARTH Lecture … Foliated textures are described on the basis of the style or degree of foliation as well as composition. 35. f). 36. Academia.edu is a platform for academics to share research papers. Becoming familiar with metamorphic textures and mineral assemblages. Foliated metamorphic rocks have four distinguishable types of aligned textures and they normally have a banded or layered appearance. This publication examines the improvement of collective … Chemographic … OBJECTIVES . Metamorphic Textures Foliated Texture: Minerals are arranged parallel to one another. The … Metamorphic textures are divided into two major groups: foliated and non-foliated. Textural features of metamorphic rocks have been discussed in the previous lecture. Discuss the mode of occurrence and characteristic textures common in metamorphic rocks. Show description. Chapters 5–7 cover textural features that can be attributed to metamorphic reactions more or less in the absence of active deformation. ���?��R����Հy�7� �=���z�.�EDŽ��BZ@ʍA���֯�'`)�S�ť858sY �\VkKQ>�JF��8n�xީY*���C��N�Y.º bF�, ��;@ �C���#YY��p;�Y�W,Q{D/�w�� T���O@� ������)Xjd=R�P���a��ȢL���^䜉� B:+ 10-Metamorphic_rocks_and_metamorphism__week7.pdf, Rutgers University, Newark • GEOLOGY MISC, Computer Technologies Program • GEOLOGY 1000. Understanding the changes that occur during the formation of metamorphic rocks. This parallel alignment causes the rock to split easily into thin layers or sheets. The … Non-uniform distribution of shear strain as proposed by Bell et al. During metamorphism, new platy mineral grains grow in the direction of least stress,producing a planar texture called foliation.Rocks with only one mineral (such as limestone) or those that recrystallize in the absence of de- forming stresses do not develop strong foliation but instead develop a gran- ular texture.Mylonite develops where shearing along a fracture forms small grains by ductile destruction of … Atlas of Metamorphic Minerals. These can range from textures similar to the original protolith at low grades of metamorphism, to textures that are purely produced during metamorphism and leave the rock with little resemblance to the original protolith. Metamorphic Textures II-- John Winter, Whitman College; powerpoint presentation with figures from Chapter 23 of Winter's Igneous and Metamorphic Petrology textbook. This preview shows page 1 - 3 out of 3 pages. ISBN-13: 9780080133164. Foliated Textures. , 20, 244- 267. Nonfoliate Texture: appear massive or granular without the characteristic parallel mineral grains in foliated rocks. Polars crossed, width of view 2.5 mm. %PDF-1.3 Mineral. Non-foliated metamorphic rocks are typically composed of just one mineral and, therefore, usually show the effects of metamorphism with recrystallization in which crystals grow together, but with no preferred direction. Y��tkGA��c�&c�n�C3����ȓ(�k.Ly� .\�j���ט-[�.B+���� ���%���(��|�R�d��s�FIrY+E�{�ʆ K�DL�޽�Hj�'-��OvY GEOLOGY – Vol. TEXTURE 1)FOLIATED a) Mineral Alignment: alignment of mineral crystals. Metamorphic systems: In many cases the bulk chemical composition of the rocks involved remains the same, such that the resultant change are in mineralogy and texture. Video Lecture: Metamorphic Textures Part 2. Examples include slate, gneiss, phyllite, and schist. Chapter 3: Igneous Textures • Magmatic reaction and resorption – Fig. This book is composed of 11 chapters and begins with a presentation of the metamorphic processes and the production of metamorphic minerals. The main difference is, of course, terminology. conditions significantly different from those under which it first formed. Most metamorphic rocks have a texture resulting from a parallel orientation of crystals, which defines a foliation or lineation. This book is composed of 11 chapters and begins with a presentation of the metamorphic processes and the production of metamorphic minerals. Foliated textures result from a parallel arrangement of flat, platy minerals. TEXTURES Textures of metamorphic rocks fall into two broad groups, FOLIATED and NON-FOLIATED. Metamorphic rocks exhibit a variety of textures. Geol., 4, 37-67. Metamorphic Rock Lab Handout-1.pdf - Rojas 1 Metamorphic Rock Lab Learning Objectives \u00d8 \u00d8 \u00d8 \u00d8 Understanding the changes that occur during the. Nonfoliate Texture: appear massive or granular without the characteristic parallel mineral grains in foliated rocks. This means that the original rock remains in a solid state without breaking. >g�Fg,� $þcw�N#�O_T�I�f|Y��GR����v�^�V����f �FZ9B.�ơ$0c�m�s�r��M9���mE�e������}�X�BQ�Q��; )b���GLC���;��ں`� TEXTURES OF THE IGNEOUS ROCKS* Structure - large-scale features recognizable in the field, such as banding, lineation, jointing, and vesicularity. The texture of a metamorphic rock is both a description of its constituent minerals along with their arrangement and size. 3.10 is an example – Olivine OPX – Resorption – refusion or dissolution of mineral back into the melt or solution from which it formed – Resorbed crystals commonly have rounded corners or are embayed – Sieve texture (Fig. The exchange of ions shown between the two local zones is required if the reactions are to occur. The discussion that is devoted to textures and their interpretation (Chapter 4) commences with a look at common metamorphic rock textures that can be encountered in the field. Examples include slate, gneiss, phyllite, and schist. METAMORPHIC TEXTURES & MINERALS GROUP 20: MEGHAN CLARK, MICHAEL FORNEA, MARK FRITCHIE, SAVINA NGUYEN, BRYCE PENNY Textures Introduction • Textural changes take place as rocks undergo prograde metamorphism. Without careful examination by the Geologist, and the recognition of the subtle changes in mineralogy and texture, much time and money can be wasted by drilling past the economic basement. (1986) J. Metam. The formation of mylonites occur at depth, below brittle faults, in continental and oceanic crust. �W�i C��4�L��n����lG�ӓ8��5栙kr^L�g�d+�3������B�~��j�2����. Foreign rocks come from the rocks themselves, but provided that they have gone through the process of mineralogy. From Yardley et al. It may be any kind of igneous, sedimentary, or older metamorphic, Metamorphism differs from sedimentary and igneous rock-forming processes because it is entirely a, . HW07: Metamorphic Rocks, Processes, and Resources Gigapan Activity: Metamorphic Rocks and Their History 1 of 6 Complete Review Metamorphic rocks are rocks that have been transformed by intense heat and pressure. Metamorphic Scheme ESRT pg.7. From Yardley et al. Field names for metamorphic rocks are less logical, simple, and consistent than names for other rock types. DRM-free (PDF) × DRM-Free Easy ... Metamorphic Textures provides definitions, descriptions and illustrations of metamorphic textures, as well as the fundamental processes involved in textural development. Written by admin. contact … 4 Chapter 3: Chemographic Diagrams and Chemographic Projections. !����iL?�h_� $n��r N,�n�_�vH��;>����ݭ��8��k׫pt���OX�L��}��Ɩ\�1d�����}��!=�ym��˛s������6����R��l������%�/�^я �;�%6$�ĬZh�&5eC��B�*\Ľ����?���K�4�����V��X\� ȋ�?�U\���,���u��!M�|�w�3� #��r��գ��[�� �}>\�[��Y 2) NON-FOLIATED : when rocks show a crystal-like appearance Quartzite Marble. Cataclastic - Hornfelsic - Granoblastic - Schistose The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. I. Igneous Textures A. The basic procedural aspects of writing a description for metamorphic rocks or rock units are identical to those for sedimentary rocks and rock units. Metamorphism changes texture, mineralogy, and chemical composition of the rock. February 25, 2018 / 697 words By Alan Spry (Auth.) Figure \(\PageIndex{3}\): An igneous rock granite (left) and foliated high-temperature and high-pressure metamorphic rock gneiss (right) illustrating a metamorphic texture. Foliation: Any Penetrative set of more or less parallel SURFACES. Metamorphic Scheme ESRT pg.7. →Sil reaction can be accomplished while producing the textures illustrated in Figure 26.20a and b. Foliated metamorphic rocks have four distinguishable types of aligned textures and they normally have a banded or layered appearance. Metamorphic Textures provides definitions, descriptions and illustrations of metamorphic textures, as well as the fundamental processes involved in textural development. Metamorphic Scheme ESRT pg.7. Throughout their cooling history all magmatic rocks try to achieve mechanical and chemical equilibrium, but rarely succeed. Foliation is produced in a rock by the parallel alignment of platy minerals (e.g., muscovite, biotite, chlorite), needle-like minerals (e.g., hornblende), or tabular minerals (e.g., feldspars). Metamorphic Textures provides definitions, descriptions and illustrations of metamorphic textures, as well as the fundamental processes involved in textural development. Oxford. Longmans. Foliation is caused by recrystallization under directed (compressional) stress. g). Gneiss Gneissic Texture 2. Igneous Metamorphic. The subsequent chapters describe the … NON-FOLIATED metamorphic rocks. EESC4701: Igneous and Metamorphic Petrology TEXTURES OF IGNEOUS ROCKS LAB 3 HANDOUT Source: WWU. Uplift Metamorphism . Arrangements: How do we identify Metamorphic rocks? Illustrate the time relations between metamorphic minerals and deformation. Relate common metamorphic rocks to different types of metamorphism. The kind of metamorphic rock made depends on the kind of original rock; for example, sandstone is turned to quartzite, shale is turned to slate, and limestone is turned to marble. metamorphic textures and features. --describe metamorphic rocks, their mineral assemblages and textures, --Interpret metamorphic processes from evidence obtained in hand sample, thin section, and analytical data (mineral composition), --Interpret tectonic setting of metamorphic belt, and--Critically evaluate the literature regarding metamorphic principles, observations, to gain a better understanding of the earth … 6 0 obj FREE PREVIEW. Petrol. <> This chapter describes different types of textures … In geology this refers to the changes in mineral assemblage and texture that result from subjecting a rock to pressures and temperatures different from those under which the rock originally formed. Cleavage Planar Fabric of Preferred Fracture, sub-parallel orientation, non-penetrative. Video Lecture: Metamorphic Textures Part 1. Traditional interpretation of spiral Si train in which a porphyroblast is rotated by shear as it grows. The different textures of mineral grains within metamorphic rocks are used to infer information about the conditions which formed them. Texture - refers to degree of crystallinity, grain size, and geometrical relationships between the cons tituents of a rock (fabric). Contrib. In metamorphic rocks formed by differential pressure, minerals such as garnet are rotated due to the unequal pressure. Chemographic … stream Textures and structures are caused by changes in the height and temperature of the pressure in the parent breed. DRM-free (PDF) × DRM-Free Easy ... Metamorphic Textures provides definitions, descriptions and illustrations of metamorphic textures, as well as the fundamental processes involved in textural development. This chapter describes different types of textures … This is a porphyritic basalt that was regionally metamorphosed to epidote amphibolite facies. Typically this will be initially described as foliated or non foliated. II - Occurrence, Texture, and Classification of Igneous Rocks - Gezahegn Yirgu ... (see Igneous and Metamorphic Petrology; Processes of Magma Evolution, Magmatic Suites and Consequences for the Composition of Continental Crust). Metamorphic textures and mineralogy develop progressively over several hundreds of feet/meters of drilling. 2) NON-FOLIATED : when rocks show a crystal-like appearance Quartzite Marble. The discussion that is devoted to textures and their interpretation (Chapter 4) commences with a look at common metamorphic rock textures that can be encountered in the field. 5 0 obj However, if there is loss or gain, the bulk chemistry varies and Pergamon. Get Metamorphic Textures PDF. The subsequent chapters describe the structural classification of grain … Foliation: Any Penetrative set of more or less parallel SURFACES. The texture and structure of metamorphic rocks represent the fundamental knowledge of metamorphic petrology. From Spry (1969) Metamorphic Textures. endobj Best regional books. ConclusionConclusion Textures of metamorphic rocks depend on the shape of the mineral, mode of growth and arrangement. Relict igneous textures in metamorphic rocks are relatively common, mostly requiring that deformation has been limited enough to allow them to survive. Phyllite is a metamorphic form of shale, mudstone, and siltstone. • The heat may come from magma intrusion or deep burial via subduction at convergent boundaries. Metamorphic textures show a great diversity in the size, shape, orientation, and spatial arrangement of crystals, which results from variable P–T conditions during metamorphism. b) Banding rocks show alternating bands of light and dark color Gneiss . Size distribution of mineral grains – 2. Many of the mineral grains in metamorphic rocks display preferential orientations where the alignment of the minerals is parallel or subparallel to one another. 2 Olivine: forsterite Olivine: Forsterite, in marble. The texture and structure of metamorphic rocks represent the fundamental knowledge of metamorphic petrology. These are a few examples of igneous feature that survived regional-scale deformation. Foliation is described as the existence or appearance of layers. Course Hero is not sponsored or endorsed by any college or university. Help to identify metamorphic reactions that may have taken place during the rock's history, and essential for deriving the P-T paths of such rocks. The slaty cleavage of the phyllite is what makes it a foliated rock. Increasing Metamorphic Grade . PDF: Metamorphic Textures. Syn-kinematic crystals Figure 23 -38. These criteria are not mutually exclusive and thus Temperature • Heat increases the rate of the chemical reactions that yield new minerals as parent rocks are metamorphosed. Academia.edu is a platform for academics to share research papers. Materi batuan metamorf pdf Metamorphic rocks are breeds derived from other breeds that are parental, such as frozen rocks and sedimentary rocks. Plane-polarised light, width of view 2.5 mm. Foliated Metamorphic Textures Slaty texture (Phyllite) Schistosity Gneissic texture. FREE PREVIEW. Understanding the agents that bring about metamorphism. Foliated texture is a pervasive layering caused by compositional layering or by the parallel orientation of platy (e.g, mica) or elongate (e.g., amphibole) mineral grains. Others have a more isotropic arrangement of mineral grains. Non-foliated are formed as a result of tectonic movements or direct pressure which makes their formation highly dependent on their pre-existing conditions. Video Lecture: Chemographic Projections. Metamorphic Textures Foliated Texture: Minerals are arranged parallel to one another. 3 Zircon Zircon, with distinct core and rim zones, in aluminous granulite. Interpret the history of metamorphic rocks from their textures and mineral assemblages. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) 1 Olivine: forsterite Olivine: Forsterite, in marble. John Wiley & Sons, New York la dolérite, olivine et plagioclase ne sont plus en équilibre la chaleur des intrusions de contact, les textures coronitiques: les textures ne sont pas orientées : L'INTERACTION DE LA CROISSANCE DES GRAINS ET DE LA DÉFORMATION Les textures préservent l'information sur le contexte géologique du métamorphisme … 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. Such features include folds, nappes, and faults with a wide variety of geometries. Metamorphic Textures provides definitions, descriptions and illustrations of metamorphic textures, as well as the fundamental processes involved in textural development. Video Lecture: Metamorphic Textures Part 1. Video Lecture: Metamorphic Phase Rule and Triangular Diagrams. Along with other properties of these rocks, it helps to characterize and distinguish them from other types of rocks and it aids in their correlation. ROCKS Introduction textures composition Be sure to ... 5.1 INTRODUCTION Magmas and Igneous Rocks - Tulane University An Introduction To Igneous And Metamorphic Petrology [PDF ... Chapter 8: Major Elements An Introduction To Igneous And Metamorphic Petrology [EPUB] The Rocks Introduction Igneous Rocks - West Virginia Network Geology Laboratory: Igneous Rocks and Processes Page - 1 … Types of Foliation Schistosity: Foliation found in Schist due to the alignment of the platy micas. Cleavage Planar Fabric of Preferred Fracture, sub-parallel orientation, non-penetrative. Atlas of metamorphic minerals and their textures. (1990) Atlas of Metamorphic Rocks and their Textures. Magnification ~20X. This book is composed of 11 chapters and begins with a presentation of the metamorphic processes and the production of metamorphic minerals. Metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (), without the protolith melting into liquid magma (a solid-state change). Foliation is caused by recrystallization under directed (compressional) stress. This book is composed of 11 chapters and begins with a presentation of the metamorphic processes and the production of metamorphic minerals. Chapter 3: Igneous Textures • 3.1.1 Rates of nucleation, growth, & diffusion – The relative rates of initial nucleation, crystal growth and diffusion will have considerable influence on the ultimate texture of the resulting rock • However, whichever rate is the slowest will be … Size • metamorphic minerals – 1 chemical equilibrium, but there are many more varieties ( and and!, nappes, and siltstone Structures are caused by recrystallization under directed ( )... Rock ( Fabric ) further classified based on – 1 prior to metamorphism foliation described... 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Table of Contents these samples of phyllite all came from the same quarry in South.... Metamorphic Phase Rule and Triangular Diagrams texture: minerals are arranged parallel to one another slate, Gneiss phyllite! Platy micas a wide range of conditions a fundamental attribute of siliciclastic sedimentary rocks rock. Logical, simple, and Schist information about the conditions which formed them are... Rock LAB Learning Objectives \u00d8 \u00d8 \u00d8 \u00d8 \u00d8 \u00d8 \u00d8 \u00d8 \u00d8 Understanding the changes that occur during.! Convergent boundaries of foliation Schistosity: foliation found in Schist due to the alignment of mineral grains: Igneous metamorphic. Rock units difference is, of course, terminology recrystallization under directed ( compressional ).... A ) mineral alignment: alignment of mineral crystals movements or direct pressure which their! Rock undergoes when exposed to physical and chemical mechanical and chemical equilibrium, but provided that have. Phyllite ) Schistosity Gneissic texture foliated rocks rotated due to the alignment of the is! Shape of the platy micas the rate of the metamorphic processes and the of... ; on-line course materials for Igneous, sedimentary and metamorphic Petrography in Marble that was metamorphosed... In the absence of active deformation such features include folds, nappes, and Schist minerals parallel. Describes different types of foliation are: 1 ) foliated a ) mineral alignment: of...: Any Penetrative set of more or less parallel SURFACES range of textures depending on the shape the. A banded or layered appearance textures … metamorphic textures • textural classification of grain … Atlas metamorphic!
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