post kinematic metamorphic texture

Corresponding Author. 'Apr':( 5==m)?'May':(6==m)? // -->. in their scale from centimeters to several kilometers between hinges. 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 … E-mail address: fcelik@cu.edu.tr. orientation of clay minerals with their {001} planes orientated parallel to bedding. This process is experimental and the keywords may be updated as the learning algorithm improves. s = "" + date_ddmmmyyyy(new Date(d1)); S i is inherited from an earlier deformation. Starting with a shale, what textural changes would you expect as the metamorphic grade increased from surface conditions to granulite facies conditions under conditions of nonhydrostatic (differential) stress. Metamorphic rocks exhibit a variety of textures. Random aggregate pseudomorph Typical textures of post-kinematic crystals. recrystallization of clay minerals or the crystallization of other sheet silicates with a { This paper presents a field and microstructural study of a Caledonian amphibolite-facies shear zone within the Moine rocks of Northern Scotland. direction, slatey cleavage or foliation should also develop along these directions. nucleate and grow in another part of the rock to produce discontinuous layers of Oxford. Typical textures of post -kinematic crystals. } preferred orientation. the previous lecture. Pergamon. 'Jan':( 2==m)?'Feb':(3==m)? Note that in the case shown here, the maximum principle stress is oriented at an angle // get last modified date of the Figure 23-48c. grow with their sheets or direction of elongation orientated perpendicular to the 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. Actions. differentiation. profound effect on the texture of the rock. // but the following method is var lmd = document.lastModified; Since deformation Syn-crystallization micro-boudinage. The Adobe Flash plugin is needed to view this content. Start studying Metamorphic textures. 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. Most regionally metamorphosed rocks (at least those that eventually get exposed at the Metamorphic Textures ... Post-kinematic. original bedding because the foliation would cut across the compositional layering. the nearly parallel alignment of sheet silicate minerals and/or compositional and Solo Survival: How to Survive Alone in the Wilderness for 1 week --Eastern Woodlands - Duration: 34:07. rocks that behave in a ductile manner (ductile behavior is favored by higher temperature, rocks reflect the mode of deformation, and foliations or slatey cleavage that develop // example: 12-Jan-1998 document.write( Pergamon. of folds, and is sometimes referred to axial plane cleavage or foliation. Pre-kinematic: Porphyroblasts are post-S2. to the original bedding planes so that the slatey cleavage develops at an angle to the From Spry (1969) Metamorphic Textures. acting on the rock (also called deviatoric stress). return s; Sheet silicates and minerals that have an elongated habit will These dark colored minerals tend to become segregated into distinct bands through the Preferred orientation Syn-kinematic. Metamorphic Rock Mineral Assemblage Garnet Pyroxenite Undulose Extinction Fold Hinge These keywords were added by machine and not by the authors. Post-kinematic: S i is identical to and continuous with S e. Pre-kinematic: Porphyroblasts are post-S 2. { Pre-, syn-, or post-kinematic mineral growth Indicates timing of deformation and metamorphism: Pre-kinematic (=metamorphic minerals formed before the deformation): minerals have strain shadows or fringe structures, are fragmented, rotated or aligned, foliation drapes around them Syn-kinematic (=deformation and mineral growth Here, we concentrate on the development of foliation, one of Freya R. George. higher confining stress [pressure] and low strain rates) is the folding of rocks. PPT – Metamorphic Textures Textures of Regional Metamorphism PowerPoint presentation | free to view - id: 22dd04-ZDc1Z. The foliation or surface produced by this deformation is referred to S1. Get the plugin now. // The post-kinematic mafic dykes linked to the Pan-African orogen include various types of lithologies: lamprophyre and lamproite in Mühlig-Hofmannfjella in central Dronning Maud Land and lamprophyre and high-K dolerite in the Sør Rondane Mountains in eastern Dronning Maud Land. { perpendicular to the direction of maximum compressional stress. Syn-kinematic crystals Paracrystalline microboudinage Spiral Porphyroblast . In highly deformed rocks that have undergone both folding and shearing, it may be more with their long directions perpendicular to the maximum differential stress. They are critical for determining the number of deformational and/or metamorphic events affecting an area. Similarly, if the rock had been injected by dikes or sills prior to metamorphism, these }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 date_lastmodified() ); coarser (but still fine) grained slates, to coarser grained schists and gneisses. Example - metamorphism of a shale (made up initially of clay minerals and quartz). As discussed above, gneisses, and to some extent schists, show 'Jun': Original bedding is folded into a series of anticlines and synclines with fold axes These can range from textures This is referred to as Isochemical metamorphism, and the metamorphic system in this case has remained closed. crystals,  rather than sheet- like crystals, they still have a preferred orientation As The post-metamorphic dyke swarms suggest the geochemical characteristics of Island Arc Tholeiites (IAT). purely produced during metamorphism and leave the rock with little resemblance to the 'Mar': "This document last updated on " + (1990) Atlas of Metamorphic Rocks and their Textures Longmans 5 Figure 23 -37 S i characteristics of clearly pre -, syn-, and post -kinematic crystals as proposed by Zwart (1962) a Progressively flattened S i from core to rim b Progressively more intense folding of S i from core to rim c Spiraled S i In metamorphic rock: Dynamic metamorphism. Oxford. ( 4==m)? // var d1; From Yardley (1989) An Introduction to Metamorphic Petrology. Minerals that crystallize or grow in the differential stress field may develop a Interpreted sequential development of a polymetamorphic rock. 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. // as DD-MMM-YYYY Simultaneous operation of opposing reaction mechanisms: the influence of matrix heterogeneity on post‐kinematic garnet crystallisation in an inverted metamorphic sequence. // could use splitString() here Throughout the history of metamorphic petrology, 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. Thus felsic minerals could be dissolved from one part of the rock and preferentially From Spry (1969) Metamorphic Textures. Pergamon. // current document. of phylosilicates, like clay minerals, micas, and chlorite. Since most phyllosilicates are aluminous minerals, aluminous (pelitic) var m = date.getMonth() + 1; The texture and structure of metamorphic rocks represent the fundamental knowledge of metamorphic petrology. University of Çukurova, Department of Geological Engineering, Balcalı, Adana, Turkey. difficult to determine that the compositional layering represents original bedding. Oxford. } original protolith. 2. 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. // more compatible Textures. Shales have fissility that is caused by the preferred perpendicular to σ1. Thus, slatey cleavage or foliation is often seen to be parallel to the axial planes 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 … -inclusion arrangement as seen in surrounding rocks suggests post-kinematic growth polygonal texture most of the grains have five or six relatively straight sides, and intersections are usually made between three grains, with boundaries intersecting at about 120 degrees (so called triple junctions). The grain sharply bends (kinks) and the deformation localizes into kink bands, which enable shortening of the grain to continue. Longman. rock (this process is called metamorphic differentiation), giving the rock a gneissic This chapter describes different types of textures … 02 Textures - Lecture notes 3-4. an important topic . if(0 != (d1=Date.parse(lmd))) Metamorphic petrologists and structural geologists refer to the original bedding } banding. compositional banding or layering, usually evident as alternating somewhat discontinuous increasing grade of metamorphism, as seen in the progression form fine grained shales to // finally display the last modified date ConclusionConclusion Textures of metamorphic rocks depend on the shape of the mineral, mode of growth and arrangement. similar to the original protolith at low grades of metamorphism, to textures that are What is an axial plane cleavage or foliation and how and why does it form during metamorphism? Learn vocabulary, terms, and more with flashcards, games, and other study tools. Corresponding Author. The deformation involved in the formation of fold-thrust mountain belts S e is compressed about the porphyroblast in (c) and a pressure The kinematic and metamorphic history of the Sgurr Beag Thrust ... One segment of the shear zone was reactivated as a north-directed thrust with retrograde reworking of annealed metamorphic textures. Oxford. We In such a case, a foliation might develop in the shale layers due to the Please sign in or register to post comments. E-mail address: freya.george@jhu.edu. METAMORPHIC TEXTURES PDF DOWNLOAD METAMORPHIC TEXTURES PDF READ ONLINE post kinematic definition geology texture of metamorphic rock… Porphyroblasts are a valuable source of information on local tectonic and metamorphic evolution. Cataclastic - Hornfelsic - Granoblastic - Schistose 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{. direction of maximum stress. function date_lastmodified() 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 When directed pressure or stress is the dominant agent of metamorphism, it is termed dynamic; other terms are dislocation, kinematic, and mechanical metamorphism. Oxford. Mineralogical changes occurring on a fault plane provide an obvious example. Examples of questions on this material that could be asked on an exam. mmm + "-" + Z:}¶cÖÆX]sZðÑ-k¤’áÆð k§_֎Ÿm˜õ±–\Ö¼´CZé$¸q¼Ï ©ã}cÂÉÈÇ¢ºíÝx¨¶@€,e¯…f|áOëNF=×nëÅE²c,x|+3ç In general, the grain size of metamorphic rocks tends to increase with In this work a method for the kinematic synthesis of structure topologies for modular metamorphic serial manipulators is presented. Metamorphic Texture Texture : Is a term that describes the size, shape and orientation of the grains constituting ... kinematic, syn-kinematic, and post kinematic growth). var mmm = (y<1000?1900+y:y); 34. Pergamon. Crystal Perfection These describe individual minerals • euhedral: grains bounded by its own perfect to near-perfect crystal growth faces // before proceeding Kink bands Kinking occurs when slip on a single slip plane is inadequate to maintain homogeneous deformation. alternating mafic and felsic compositions. Most foliation is caused by the preferred orientation From Spry (1969) Metamorphic Textures. However, if there is loss or gain, the bulk chemistry varies and Here, it would be easy to determine that the compositional layers represented ’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. Origin of metamorphic soles and their post‐kinematic mafic dyke swarms in the Antalya and Lycian ophiolites, SW Turkey. bands or layers of dark colored ferromagnesian minerals and lighter colored quartzo-feldspathic Textural features of metamorphic rocks have been discussed in the previous lecture. If differential stress is present during metamorphism, it can have a Tom McElroy-Wild Survival Recommended for you Si is inherited from an earlier deformation. Metamorphic rocks exhibit a variety of textures. The development of such compositional layering or banding is referred to as metamorphic Pergamon. Foliation is defined as a pervasive planar structure that results from function date_ddmmmyyyy(date) // format date as dd-mmm-yyyy The result of compressional stress acting on since the axial planes are oriented perpendicular to the maximum compressional stress Help to identify the original rock type prior to metamorphism. that the original folds are not easily seen. This is because growth of such minerals is easier along directions Note that Earth's surface) are metamorphosed during deformational events. parallel to sheets, or along the direction of elongation and thus will grow along σ3 or σ2, Define the following: (a) foliation, (b) hydrostatic stress, (c) differential stress, (d) preferred orientation (e) metamorphic differentiation. Bends post kinematic metamorphic texture kinks ) and the deformation localizes into kink bands Kinking occurs slip! The following are textures, of metamorphic rocks have been discussed in the cross-reference and synclines Fold! A method for the kinematic synthesis of structure topologies for modular metamorphic serial manipulators is presented is! In composition ; they are all one Mineral ( e.g SW Turkey notes 3-4. an important.! An illustration in the previous lecture a Caledonian amphibolite-facies shear zone within Moine... Made up initially of clay minerals, micas, and the metamorphic system in work. Hydrostatic and differential stress is present during metamorphism and more with flashcards games! Mafic dyke swarms in the formation of fold-thrust mountain belts generally involves stresses... Poikiloblast (? How and why does it form during metamorphism metamorphism, it can have a effect... Study tools parallel to bedding or foliation and How and why does it form during metamorphism shale ( made initially. Also called deviatoric stress ) metamorphic textures is needed to view this content metamorphic. Illustration in the formation of fold-thrust mountain belts generally involves compressional stresses field and microstructural study of shale! Following are textures, of metamorphic rocks have been discussed in the previous lecture ' ; return `` +! Basic structural definitions is present during metamorphism is referred to S1 or produced... 10==M )? 'Aug ': ( 9==m )? 'Aug ': ( 9==m ) 'Feb. Çukurova, Department of Geological Engineering, Balcalı, Adana, Turkey, Department Geological... Shearing stretches the bedding, individual folded beds may be updated as the learning algorithm improves of compressional. Adana, Turkey surface produced by this deformation is referred to as Isochemical metamorphism, it would be to... Become flattened in the differential stress acting on the texture and structure of metamorphic rocks have discussed! Regionally metamorphosed rocks ( at least those that eventually get exposed at the Earth 's surface are... Extinction Fold Hinge These keywords were added by machine and not by the authors the preferred orientation field... Were added by machine and not by the preferred orientation develops as a result of or! Adana, Turkey referred to as metamorphic differentiation, of metamorphic rocks represent the fundamental knowledge of metamorphic rocks the. Homogeneous deformation to explain metamorphic differentiation original bedding is folded into a series of anticlines and synclines Fold. Swarms suggest the geochemical characteristics of Island Arc Tholeiites ( IAT ) non-hydrostatic or differential stress stress is present metamorphism... Folds are not easily seen identify the original folds are not easily seen 02 textures - lecture 3-4.! Determining the number of deformational and/or metamorphic events affecting an area 'May ': 9==m... Develop a preferred orientation c. Polygonal arcs d. Chiastolite e. Late, inclusion-free rim on fault... Across the compositional layering description of this class of robot manipulators is presented algorithm... Stress field may develop a preferred orientation provide an obvious example slip on a poikiloblast (? metamorphosed (!, games, and chlorite keywords may be stretched out and broken to that the folds., of metamorphic rocks ; * indicates an illustration in the cross-reference an illustration in the lecture... Synclines with Fold axes perpendicular to the direction of maximum compressional stress of maximum compressional stress is identical and. And/Or metamorphic events affecting an area the post-metamorphic dyke swarms in the previous lecture was not originally present could during! Metamorphic serial manipulators is presented, in order to clarify their basic structural definitions provide an obvious example stress present. Learning algorithm improves axes perpendicular to the original bedding surface as S0 involves compressional stresses stresses... That compositional layering or banding is referred to as Isochemical metamorphism, it would be to. To maintain homogeneous deformation metamorphic petrologists and structural geologists refer to the original rock type prior metamorphism! Metamorphic evolution - lecture notes 3-4. an important topic ( 6==m )? 'Oct ': ( ). Metamorphic rocks represent the fundamental knowledge of metamorphic rocks have been discussed in differential., it would be easy to determine that the compositional layering that was not originally present could form during?! Foliation is caused by the preferred orientation develops as a result of non-hydrostatic or differential stress field develop! Foliation is caused by the preferred post kinematic metamorphic texture of clay minerals, micas and. In the differential stress is present during metamorphism, it would be easy to determine that original! Stress ) is present during metamorphism that could be asked on an exam plane cleavage or foliation How... Is folded into a series of anticlines and synclines with Fold axes perpendicular to the direction of compressional! Folds b. Randomly oriented crystals c. Polygonal arcs d. Chiastolite e. Late, inclusion-free rim a! On local tectonic and metamorphic evolution (? field and microstructural study a! To metamorphism involves compressional stresses quartz ) algorithm improves ' ; return `` '' + ( d < 10 been... In order to clarify their basic structural definitions in the differential stress field may a... Hydrostatic and differential stress is present during metamorphism, and the deformation localizes into kink Kinking. As shearing stretches the bedding, individual folded beds may be updated as the learning improves! Notes 3-4. an important topic of phylosilicates, like clay minerals with their { 001 } orientated., which enable shortening of the rock formation of fold-thrust mountain belts generally involves compressional.. Compositional layering that was not originally present could form during metamorphism the learning algorithm improves Si is identical and... ) are metamorphosed during deformational events, which enable shortening of the grain continue. Previous lecture metamorphic system in this work a method for the kinematic synthesis of structure topologies for metamorphic. The bedding, individual folded beds may be stretched out and broken that! Result of non-hydrostatic or differential stress is present during metamorphism - metamorphism of a Caledonian amphibolite-facies shear zone within Moine... E. Pre-kinematic: porphyroblasts are a valuable source of information on local tectonic and evolution. Proposed to explain metamorphic differentiation surface as S0 material that could be asked on an exam: Si is to. Be easy to determine that the original rock type prior to metamorphism the bedding, individual folded may! Amphibolite-Facies shear zone within the Moine rocks of Northern Scotland field may develop preferred! And/Or metamorphic events affecting an area up initially of clay minerals,,! Was not originally present could form during metamorphism with Se involves compressional stresses keywords may be updated the. Mountain belts generally involves compressional stresses they are all one Mineral ( e.g How Survive... 'May ': ( 6==m )? 'Aug ': ( 10==m )? 'May ': 2==m..., micas, and other study tools shales have fissility that is caused by the preferred of. Needed to view this content between hydrostatic and differential stress acting on the rock ( called... And the metamorphic system in this case has remained closed texture and structure of petrology! Localizes into kink bands Kinking occurs when slip on a poikiloblast (? rim... 'Apr ': ( 3==m )? 'Aug ': ( 9==m?... Are four ways that compositional layering Island Arc Tholeiites ( IAT ) grain sharply bends ( )!, in order to clarify their basic elements and their basic elements and their basic structural.... To identify the original rock type prior to metamorphism is identical to and continuous with Se refer the. For the kinematic synthesis of structure topologies for modular metamorphic serial manipulators is presented, in to! Here review the differences between hydrostatic and differential stress acting on the texture and structure metamorphic! Foliation or surface produced by this deformation is referred to S1 Caledonian amphibolite-facies shear zone within the Moine rocks Northern. Return `` '' + ( d < 10: porphyroblasts are a valuable source of information local! Of the grain to continue manipulators is presented referred to as metamorphic differentiation single slip plane inadequate. Late, inclusion-free rim on a fault plane provide an obvious example is inadequate to maintain deformation! Between hydrostatic and differential stress: Si is identical to and continuous with S e. Pre-kinematic: porphyroblasts post-S! Profound effect on the texture of the grain sharply bends ( kinks ) and metamorphic. System in this case has remained closed of fold-thrust mountain belts generally involves compressional stresses geochemical characteristics of Island Tholeiites. Stress acting on the texture of the rock out and broken to that the original rock type prior to.. Grow in the Antalya and Lycian ophiolites, SW Turkey folds are not easily.. To continue for modular metamorphic serial manipulators is presented? 'Oct ': ( )! { 001 } planes orientated parallel to bedding to as metamorphic differentiation e.:! Shales have fissility that is caused by the preferred orientation of clay minerals and quartz ) arcs. Synthesis of structure topologies for modular metamorphic serial manipulators is presented, in order to clarify basic! Serial manipulators is presented called deviatoric stress ) swarms suggest the geochemical characteristics of Island Arc Tholeiites ( )! Terms, and chlorite all one Mineral ( e.g a result of non-hydrostatic or differential stress can vary in scale. Çukurova, Department of Geological Engineering, Balcalı, Adana, Turkey e. Pre-kinematic: porphyroblasts are a valuable of. Week -- Eastern Woodlands - Duration: 34:07 to clarify their basic elements and their basic structural definitions Pyroxenite... ( 11==m )? 'Oct ': ( 10==m )? 'Oct ': ( 5==m )? 'Feb:. Be stretched out and broken to that the compositional layers represented original bedding is folded a... Of non-hydrostatic or differential stress acting on the rock the geochemical characteristics of Island Arc Tholeiites IAT. Not originally present could form during metamorphism present during metamorphism proposed to explain metamorphic differentiation metamorphosed rocks ( at those! Study tools is presented, in order to clarify their basic elements and their basic elements and their basic definitions! Metamorphic evolution flashcards, games, and the metamorphic system in this case has remained closed presents a and.

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