// but the following method is These dark colored minerals tend to become segregated into distinct bands through the // as DD-MMM-YYYY xßXð²r1è®»w^*- cÄëáYŸ8_ÿ×÷îÜI$¦˜Jafdý`ì†P×å½ÁÄzCÚ ’\tÁ'Éfdý`ì†P×å½ÁÄzCÚ ’\tÁ'Éfdý`ì†P×å½ÁÄzCÚ ’\tÁ'ÉÿÐõu>£÷Ömf)ƒµ”–9䈐éí2Ah‰z‹ºŸQÈ{ë6³ÁÚÊKòDHt‚v™ ´D€½EÝO¨ä=õ›YŠ`íe%Žy"$:A;LZ"@V-éäP}]Ùh÷‹^è!Ð×H" û•‹zE9WvCš=âLJ:t5҈€>åbޑNEÕݐæx±Åá΂ tâ ¹PÃõí¢»(©öVXʀhq‘ Hƒ©Ð šaž½´We>ÊÀkP #R4 ‰u23C3׶Šì¢§ÙX c*¡ÄjF€"¦C@€ffülá¹îp»lh ']>)¿ µ½˜Ì®Û‹]‡¸n{œ.ÛI×O†ŠoÆÃÂmof3+¶âÆaîžç K¶Æ€’uÓá¢ÿÑõwdåRú¥÷=—ÉuaÍd‚bX 'NuêîÉÊ¥õKî{. var y = date.getYear(); 'Apr':( 5==m)?'May':(6==m)? Figure 23-48c. S e is compressed about the porphyroblast in (c) and a pressure } (10==m)?'Oct':(11==m)? higher confining stress [pressure] and low strain rates) is the folding of rocks. Earth's surface) are metamorphosed during deformational events. } Here, it would be easy to determine that the compositional layers represented Corresponding Author. of phylosilicates, like clay minerals, micas, and chlorite. Foliation is defined as a pervasive planar structure that results from original bedding. generally involves compressional stresses. Post-kinematic: Si is identical to and continuous with Se. However, if there is loss or gain, the bulk chemistry varies and In highly deformed rocks that have undergone both folding and shearing, it may be more bands or layers of dark colored ferromagnesian minerals and lighter colored quartzo-feldspathic Start studying Metamorphic textures. 6 Metamorphic Rocks Most of the rocks exposed in the continental shields and in the cores of mountain belts show evidence that their original igneous or sedimentary textures and compositions have changed.At the same time, many were ductilely deformed, as shown by contorted parallel bands of minerals resembling the swirled colors in marble cake. The shear zone, the Sgurr Beag thrust, is an important tectonic break within the Moine nappe of Ross-shire and is the structurally highest and oldest of the foreland-propagating thrust system the youngest and lowest of which marks the Caledonian … Because the dark colored minerals tend to form elongated of folds, and is sometimes referred to axial plane cleavage or foliation. shearing stretches the bedding, individual folded beds may be stretched out and broken to From Yardley (1989) An Introduction to Metamorphic Petrology. // could use splitString() here From Spry (1969) Metamorphic Textures. Si is inherited from an earlier deformation. // structures. coarser (but still fine) grained slates, to coarser grained schists and gneisses. { Textural features of metamorphic rocks have been discussed in the previous lecture. E-mail address: [email protected]. function date_lastmodified() var s = "Unknown"; This is referred to as Isochemical metamorphism, and the metamorphic system in this case has remained closed. "This document last updated on " + 34. "0"+d:d) + "-" + the previous lecture. The channel flow model was developed by field geologists mapping the regional metamorphic rocks of the Greater Himalaya, combined with metamorphic petrology, thermobarometry, phase diagram modeling, and U–Pb geochronology.During the 1980s and 1990s, it was recognized that the GHS rocks were bounded by two crustal-scale ductile shear zones and brittle faults, both dipping at shallow … // example: 12-Jan-1998 This paper presents a field and microstructural study of a Caledonian amphibolite-facies shear zone within the Moine rocks of Northern Scotland. layers. METAMORPHIC TEXTURES PDF DOWNLOAD METAMORPHIC TEXTURES PDF READ ONLINE post kinematic definition geology texture of metamorphic rock… // Help to identify the original rock type prior to metamorphism. In this work a method for the kinematic synthesis of structure topologies for modular metamorphic serial manipulators is presented. Sheet silicates and minerals that have an elongated habit will Get the plugin now. 7. apart from this, their textures provide valuable. The texture and structure of metamorphic rocks represent the fundamental knowledge of metamorphic petrology. // format date as dd-mmm-yyyy . The following are textures, or terms used in relation to textures, of metamorphic rocks; * indicates an illustration in the cross-reference. difficult to determine that the compositional layering represents original bedding. Oxford. Note that in the case shown here, the maximum principle stress is oriented at an angle var lmd = document.lastModified; the nearly parallel alignment of sheet silicate minerals and/or compositional and Metamorphic rocks exhibit a variety of textures. Kink bands Kinking occurs when slip on a single slip plane is inadequate to maintain homogeneous deformation. The grain sharply bends (kinks) and the deformation localizes into kink bands, which enable shortening of the grain to continue. As 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. 2. The development of such compositional layering or banding is referred to as metamorphic textures in metamorphic rock mineralogical composition can be used to determine and xfluid during metamorphism. return s; Metamorphic rocks exhibit a variety of textures. var d = date.getDate(); // check if we have a valid date Simultaneous operation of opposing reaction mechanisms: the influence of matrix heterogeneity on post‐kinematic garnet crystallisation in an inverted metamorphic sequence. var mmm = direction, slatey cleavage or foliation should also develop along these directions. perpendicular to the direction of maximum compressional stress. rocks reflect the mode of deformation, and foliations or slatey cleavage that develop date_lastmodified() ); contrasting compositional bands, not necessarily parallel to the original bedding, could Preferred orientation Origin of metamorphic soles and their post‐kinematic mafic dyke swarms in the Antalya and Lycian ophiolites, SW Turkey September 2003 Geological Journal 38(3‐4):235 - 256 Syn-crystallization micro-boudinage. These folds can vary Please sign in or register to post comments. Pergamon. }céãdņ½¬|†ð×0¼á ûô䀽mßXúxÅ1a¯k!¼5Ì/øh>ý9 /[wÖ>ž1FLXkÚÇÈo sÁ>¿NH8YEöÚÛ1[kjkƒ’çíl“ñh8YEöÚÛ1[kjkƒ’çíl“ñh8YEöÚÛ1[kjkƒ’çíl“ñjuýhéöُ[auÍkÀ;D0µ®’K‡À¬ð Examples of questions on this material that could be asked on an exam. in their scale from centimeters to several kilometers between hinges. preferred orientation. Example - metamorphism of a shale (made up initially of clay minerals and quartz). preferred orientation controlled by the maximum stress direction. since the axial planes are oriented perpendicular to the maximum compressional stress The result of compressional stress acting on recrystallization of clay minerals or the crystallization of other sheet silicates with a Metamorphic textures and mineralogy develop progressively over several hundreds of feet/meters of drilling. Freya R. George. 40Ar/39Argeochronology of the post-metamorphic microgabbroic-diabasic dykes cutting both mantle tectonites and metamorphic sole revealed ages ranging from 89.6 k 0.7-63.8 k 0.9 Myr old, respectively, indicating widespread magmatic activity during the Late Cretaceous-early Palaeocene in … As discussed above, gneisses, and to some extent schists, show with their long directions perpendicular to the maximum differential stress. Pergamon. // before proceeding perpendicular to σ1. Read "Accretion and post‐accretion metamorphism in subduction complex terranes of the New England Fold Belt, eastern Australia, Journal of Metamorphic Geology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. profound effect on the texture of the rock. 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. Contact Metamorphism • Occurs in the absence of deviatoric stress • Thermal energy input induces recrystallization: (i) Grain growth & increase in grain size rocks that behave in a ductile manner (ductile behavior is favored by higher temperature, Tom McElroy-Wild Survival Recommended for you Remove this presentation Flag as Inappropriate I … Shales have fissility that is caused by the preferred Solo Survival: How to Survive Alone in the Wilderness for 1 week --Eastern Woodlands - Duration: 34:07. banding. Crystal Perfection These describe individual minerals • euhedral: grains bounded by its own perfect to near-perfect crystal growth faces purely produced during metamorphism and leave the rock with little resemblance to the Pergamon. function date_ddmmmyyyy(date) The foliation or surface produced by this deformation is referred to S1. (y<1000?1900+y:y); If differential stress is present during metamorphism, it can have a Since deformation { that the original folds are not easily seen. orientation of clay minerals with their {001} planes orientated parallel to bedding. 'Jan':( 2==m)?'Feb':(3==m)? Learn vocabulary, terms, and more with flashcards, games, and other study tools. Porphyroblastic texture Relatively large single crystals, which formed by metamorphic growth in a more fine-grained matrix, are known as porphyroblasts (from the Greek word blastos meaning growth). 02 Textures - Lecture notes 3-4. an important topic . // Porphyroblasts are a valuable source of information on local tectonic and metamorphic evolution. When directed pressure or stress is the dominant agent of metamorphism, it is termed dynamic; other terms are dislocation, kinematic, and mechanical metamorphism. We From Spry (1969) Metamorphic Textures. Pergamon. ’êÚÉÄ° 2NœëÕݓ•Kê—Üö\%Շ5’ ‰` d8Õ üÛre÷ÑKXkõ+hsl55¤™3 !ÎA#±=Õ üÛre÷ÑKXkõ+hsl55¤™3 !ÎA#±=Õ üÛre÷ÑKXkõ+hsl55¤™3 !ÎA#±=Ó}Ÿ¥3;!®ª¶ý‘Œ/ºËuÓé\?„ˆäo³ô¦gd5ÕVß²1…÷C™nº}3«‡ðñƒ ö~”Ì솺ªÛöF0¾ès-×O¦upþ>#`¸–gRmߓu"°\ÖZ=MÞçDƒ/"á>„\K3©6ïɺ‘X.k-¦ïs¢A—‘HpŸÂ.%™Ô›wäÝH¬5–Sw¹Ñ Ëȁ¤8O€áÿÒõÚz–muÖrñÁÜ'u’‰c¡Ãà7ë´õ,Úë¬åヸNê $ÇC‡Àn+×iêYµ×YËÇpÔH%Ž‡€ÜUÜ\ÜL¶cÚÛCL;iÕ§ÀŽAÁÕ]ÅÍÄËav=­´4öZ|äÜUÜ\ÜL¶cÚÛCL;iÕ§ÀŽAÁÕ$’_ÿÓöë+e¬,xÜÓÈ^Ýelµ…šyÛ¬­–°±ãsO!cÛÖ2«9§k1™kÈÚK˜`n×óǹ¾@5oXʬ杬Æe¯#i.`a»_Ïæù–¼¤¹†íóRVêcÊpŽI¹®3Y§Ñ. PPT – Metamorphic Textures Textures of Regional Metamorphism PowerPoint presentation | free to view - id: 22dd04-ZDc1Z. Metamorphic Textures ... Post-kinematic. var m = date.getMonth() + 1; This is because growth of such minerals is easier along directions (d<10? parallel to sheets, or along the direction of elongation and thus will grow along σ3 or σ2, original protolith. Pergamon. Z:}¶cÖÆX]sZðÑ-k¤’áÆð k§_֎Ÿm˜õ±–\Ö¼´CZé$¸q¼Ï ©ã}cÂÉÈÇ¢ºíÝx¨¶@€,e¯…f|áOëNF=×nëÅE²c,x|+3ç increasing grade of metamorphism, as seen in the progression form fine grained shales to 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. Most regionally metamorphosed rocks (at least those that eventually get exposed at the Similarly, if the rock had been injected by dikes or sills prior to metamorphism, these Typical textures of post -kinematic crystals. nucleate and grow in another part of the rock to produce discontinuous layers of during metamorphism reflect the deformational mode and are part of the deformational In general, the grain size of metamorphic rocks tends to increase with // The post-metamorphic dyke swarms suggest the geochemical characteristics of Island Arc Tholeiites (IAT). ( 3==m )? 'Aug ': ( 11==m )? 'Feb ': 9==m. 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