32. Structures of Metamorphic rocks. 4. banded structure in a metamorphic rock b/c of metamorphic segregation of minerals into compositionally different layers. 4.2 Importance of geological studies to Engineers and significance of geological Investigations for civil engineering projects. Explain the cata elastic, porphyoclastic, maculose structures in rocks with neat sketches ? Introduction To Mineralogy The earth is made of rocks, which are in turn made of minerals. الصخور المتحولة Metamorphic Rocks هى الصخور التي تتكون من الصخور الموجودة اصلاً, سابقة التكوين (نارية, رسوبية أو متحولة) نتيجة لتغير الظروف المحيطة مثل الضغط ود ... Maculose structure 2. b) Explain textures of igneous and metamorphic rocks ? Textures - Crystalloblastic, Palimpsest, Xenoblastic, Idioblastic. Unit -IV Classification of metamorphic rocks –concept of metamorphic facies. having a spotted or knotted appearance (oft meta.) Engineering Geology (14 Hours 23%) 4.1 Basics of Engineering Geology. 4.3 Geology for Site selection of Dam, Tunnel, Reservoir and Highways. ... states that in undisturbed sedimentary rocks, the oldest layers are on the bottom, the youngest on the top. Structures of metamorphic rocks – cataclastic, maculose, schistose, granulose and gneissose. 9. Definition of metamorphism, agents of metamorphism, types of metamorphism, zones of metamorphism – metamorphic minerals – stress and anti-stress minerals. Structures of metamorphic rocks - Cataclastic, maculose, schistose, granulose and gneissose. Textures of metamorphic rocks – crystalloblastic, palimpsest, xenoblastic, idioblastic. HA 1647 26. changes changes Maculose structure generally develops in 21. The metamorphic structure produced by thermal metamorphism of argillaceous rocks, which is characterized by spotted apperarnce due to the development of equi-dimensional minerals and porphyroblasts of andalusite, cordierit biotite, chloritoid, etc. Earth movements: Definition of diastrophism, epirogeny and orogeny – mountains, continental drift and plate tectonics . Adjacent to the igneous contact, however, a very fine-grained, equigranular, cordierite-sillimanite-biotite hornfels is formed. of weathering – Types of weathering of rocks – physical and chemical; Definition of erosion and denudation, agents of erosion,cycle of erosion; erosion, transportation and deposition;. • Hot molten material occurring naturally below the surface of earth is called magma, and which comes on surface and starts flowing along it is called as lava. Intergrowth Texture. Metamorphic Rocks: Definition of metamorphism, agents of metamorphism, type of metamorphism, grade and zones of metamorphism, Metamorphic minerals - stress and antistress minerals. The IOG rocks have been folded into a major NNE plunging horseshoe-shaped synclinorium, overturned towards the east, and cross folded along an E–W axis [24,28]. Textures of metamorphic rocks crystalloblastic, palimpsest, xenoblastic, idioblastic. Dish and pillar structures in sedimentary rocks respectively show: 1) Escape of water, escape of water. spotted slates, that have a spotted character, also, said of the structure itself] gefleckt, Fleck(en) … Contact metamorphism occurs when a mass of hot magma intrudes into pree… Contact Lenses, A contact lens is a small, shell-shaped piece of eyeware used to correct vision. Up to what temperature do minerals in rocks are stabile? Igneous rocks • Broadly, all rocks which are formed from an original hot, molten material through the process of cooling and crystallization are defined as igneous rocks. Cataclastic metamormphims of argillaceous and arenaceous rocks. Cross beds are produced when (1) (2) (3) (4) type of rocks. Structures of metamorphic rocks – Cataclastic, maculose, schistose, granulose and gneissose. It is placed directly over the cornea (the transparent, or clear, ti… The first mention of contact metamorphic phenomena dates back to the end of eighteenth century when James Hutton observed that the rocks surrounding a granitic body at Glen Tilt (Perthshire, Scotland) had suffered marked changes in either colo ur or structure especially in zones crossed by granitic veins (Playfair, 1822). rocks and generally form a maculose cordierite-andalusite-biotite norn-fels. Quiz GATE/NET #161 Login/SignUP with e-mail OR Social Login 2.3.3 Metamorphic rocks Metamorphic rocks are differentiated from igneous and sedimentary rocks pri marily on the basis of structure and mineralogical composition. Hornfels, Hornfels is a fine-textured metamorphic rock formed by contact metamorphism . 10. Along the sharp and vertical or steeply dipping contact between the hornfels and 11. Boudinage is the term applied to the structure composed of a series of boudins. Thermal metamorphism Metamorphic textures are subdivided on the basis of deformation and include intergranula textures such as foliated, lineated, mortar, flaser augen structure. 2) Escape of water, barriers to escape of water For rocks to be folded, they must behave as This type of mutual arrangement is expressed by the term intergrowth texture QUESTIONS METAMORPHIC ROCKS 1. 73 Large scale structural features Rock cleavage Flow cleavage Fracture cleavage Schistosity Foliation. I t is vie wed as maculose in structure ... of metagraywacke-type rocks and describe selected mineralogical features that can be used to determine metamorphic grade in metagranitoid rocks. The iron ore mineralization is mainly associated with an anticlinal structure followed by three phases (D … A. Schistose structure B. Granulose structure C. Gneissose structure. Football in cross-section hrs thermal metamorphism on argillaceous rocks like shale Palimpsest structure George Walter Tyrrell unit Classification... From igneous and sedimentary rocks pri marily on the top Mineralogy the earth is made minerals. Structural features Rock cleavage Flow cleavage Fracture cleavage Schistosity foliation is expressed by the term to. Develops in 21 Granoblastic, porphyroblastic, relict rocks like shale equigranular, cordierite-sillimanite-biotite hornfels formed... Explain the cata elastic, porphyoclastic, maculose, schistose, granulose and gneissose 4 ) 13 - Concept metamorphic. 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