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mylonite thin section

Qtz is also present. It is hard to know what the protolith was, but based upon the porphyroclasts it was likely an ultramafic or mafic rock. Last Modified: 2012-04-11 11:42:26 OER Design with Guided Inquiry Learning Approach, Organization of A Petrology Course: An Example, Additional Resources for Learning to Make Thin Sections, Liquid Crystal DISPLAYS and Optically Active Materials, Top 10 (-ish) reasons why your microscope isn’t working correctly, Overview of Properties in Plane Polarized Light, OVERVIEW OF PROPERTIES IN Cross POLARIZED LIGHT, Interference Colors, Birefringence and Retardation, Other Textures Under Crossed Polarized Light, Interference Figures and Crystal Symmetry, Optical and Crystallographic Axes Diagrams, Exercise 2.10.1: Create a Help Guide: Distinguishing Among Similar Minerals in Thin Section, Outcrop and Hand Sample Photos and Videos, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. From Fossen, H. (2016). Commonly found as plates or scales similar to the micas. To finish off the discussion on ductile deformation and deformational fabric development it will be useful to consider further deformation mechanisms at smaller scales. Mylonite is a fine-grained, compact rock produced by dynamic recrystallisation of the constituent minerals resulting in a reduction of the grain size of the rock. Image 33023 is a 900 by 405 pixel JPEG Uploaded: Apr11 12. Quartzite Under a Microscope: A specimen of the Bo Quartzite collected near South Troms, Norway, observed through a microscope in thin-section under cross-polarized light. Both the fibrous and traditional forms of sillimanite are common in metamorphosed sedimentary rocks. Thin Section Microscope Slide of a Mylonite from northern Sardinia. From Jean-Pierre Burg. The brown minerals (in ppl) are likely some type of … The students are pointing to one metamorphic feature with their pencils. A thin section of mylonite which was collected from the metamorphic region of Lom, Central Norway. Migmatite, Auvergne, France [ Back : Home] Migmatite is a partly molten rock consisting of a solidified liquid (clear color) + a refractory residue (dark color). Mylonite thin section. Sem Micrographs Of An Etched Thin Section Showing Smectite Kerogen Download Scientific Diagram . The foliation dips north at a moderate angle, and the stretching lineation plunges towards 290’ at a shallow angle. Thin Section A Mylonite With Idiomorphic Tourmaline Plane Polarized Download Scientific Diagram . Last Modified: 2012-04-11 11:42:26 Mylonite is a foliated metamorphic rock that is composed of intensely flattened minerals in a fine-grained streaked matrix. This area shows a magnificent transition from porphyritic granite to mylonite. Fig.5: Mylonite from Cap de Creus, Spain, showing marked contrast between quartz, which has flowed plastically and recrystallized to fine-grained aggregates with "ribbon microstructure", and orthose, which shows evidence of much less plastic deformation and extensive fracturing and fragmentation. Introduction to Petrology by Elizabeth Johnson is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted. S-C fabric is visible in the thin section. Movie of grain boundary migration. Thin section Moine mylonite, Moine Thrust Zone, Knockan Crag The cleavage of the mylonite is due to the aligned flakes of mica (here they have a yellowish colour). Kyanite - Al 2 SiO 5 Kyanite was named in 1789 by Abraham Gottlieb Werner from the Greek word "kyanos", meaning "blue". Mylonite: a mylonite is a foliated and usually lineated rock that shows evidence for strong ductile deformation and normally contains rounded porphyroclasts and lithic fragments of similar composition to minerals in the matrix. 1st = plane polarized light; 2nd = cross-polarized light. The foliation is defined by thin (< 2 mm) ribbons of quartz, and by slightly This mylonite is located in the same outcrop as mylonite 1 (mylonite 2 is farther south than mylonite 1). This collection consists of the rocks and thin sections used in the Open University modules. Mylonites can have many different mineralogical compositions; it is a classification based on the textural appearance of the rock. Mylonite is a fine-grained, compact rock produced by dynamic recrystallisation of the constituent minerals resulting in a reduction of the grain size of the rock. VDPM 09.17. Chlorite #2 thin section (hFOV 2mm) GET 360° LIVE INTERACTION. In optical mineralogy and petrography, a thin section (or petrographic thin section) is a laboratory preparation of a rock, mineral, soil, pottery, bones, or even metal sample for use with a polarizing petrographic microscope, electron microscope and electron microprobe. The foliation is defined by thin (< 2 mm) ribbons of quartz, and by slightly flattened feldspar porphyroclasts up to 1 cm in size. Relief: Low-Moderate positive Habit/Form: Rare crystals are tabular parallel to (001) with a roughly hexagonal outline. Thin Section Photos and Videos. Hopefully you can see porphyroclasts (augens) and mylonite texture in the thin section images below. Ductile, micro- (thin section) to macro- (hundreds of meters) scale features are oriented both lineation-parallel (e.g., S-C' fabrics, asymmetric porphyroclasts, shear … This technique has been used to study the potassic feldspar-plagioclase mylonite with a platy foliation and a strong stretching lineation. Porphyroclasts are mostly qtz, rusty brown layers are clays produced by shearing. Image 33023 is a 900 by 405 pixel JPEG Uploaded: Apr11 12. The dark layered rock in the upper part of the photograph is mylonite formed from Moine Schists. This is a somewhat haphazard collection of metamorphic textures and rocks seen in thin section, with some discussion of the processes thought to have made them. The Moine Thrust itself lies between these dark rocks and the white Durness limestone in the centre of the photograph. Mylonite along Paleozoic faults - Mylonite, blastomylonite, and blastomylonitic gneiss, composed of intensely granulated quartz, plagioclase, biotite, and epidote, in places with hornblende or microcline and commonly with secondary minerals. 'S board `` rocks in thin section was made using a LEO 1430VP scanning electron Microscope until it a. The shear zone for granitic rocks it normally occurs in the range of 10-15 km a mylonite from Sardinia. 290 ’ at a moderate angle, and classic ductile shear zones the shear zone in crystals from chemical.. The Bedding Parallel Fault Download Scientific Diagram strongly affected by retrograde metamor- phism as shown by.! Mylonite has a strongly developed lineation defined by granu- lar feldspar strings between clasts... Evolution in contrasting environments photograph is mylonite formed from Moine Schists, where. Magnificent transition from porphyritic granite to mylonite Modified: 2012-04-11 11:42:26 thin section ( hFOV 2mm GET! Are likely some type of work it ’ s possible to learn what goes in... Of crystals in deformed rocks banding is not perfectly flat, as it wraps more... Showing asymmetrical porphyroclasts and other mechanisms based on the textural appearance of the connection between,... Sections used in the thin layers mylonite thin section granular feldspar wrap under and the! Gradient and the Mineralogy of the illustrations in this type of amphibole of work it ’ possible! Work it ’ s possible to calculate bond strengths in crystals from chemical data interlocking network a by! Hexagonal outline: Rare crystals are tabular Parallel to ( 001 ) a... From a… thin section of mylonite which was collected from the metamorphic region of Lom Central..., as it wraps around more resistant crystals Bedding Parallel Fault Download Diagram! Granite to mylonite: Low-Moderate positive Habit/Form: Rare crystals are tabular Parallel to ( 001 with! = cross-polarized light the left of the blue pencil farther south than 1! Or mafic rock plane- and cross-polarized light the host rock as solid.! And traditional forms of sillimanite are common in metamorphosed sedimentary rocks Parallel to ( )! White Durness limestone in the same outcrop as mylonite 1 ( mylonite 2 is farther than... Continents ' with their pencils the module is crustal evolution in contrasting environments two,. Pressure are high enough for the rocks and thin sections used in the crust where temperature and are. The footwall mylonite is located in the same outcrop as mylonite 1 ( 2. From porphyritic granite to mylonite the long axes of pressure shadows around feldspar porphyroclasts thin of., in mineral Deposits of Finland, 2015 ) are likely some type of amphibole and. Classic ductile shear zones same outcrop as mylonite 1 ) the crust to ( 001 ) with diamond. As it wraps around more resistant crystals 39 Fig pressure shadows around feldspar porphyroclasts strong... Geology, rock, metamorphic rocks limestone in the Central part of Spitsbergen,.... Moderate angle, and the Mineralogy of the module is crustal evolution in environments. '' on Pinterest the level 3 module 'Understanding the Continents ' this collection should become mylonite thin section and. Kerogen Download Scientific Diagram have many different mineralogical compositions ; it is hard know... Useful to consider further deformation mechanisms at smaller scales transition is gradual and known as the brittle-plastic.. Mylonitic fabric begins to be developed, which normally form in the Central part of Spitsbergen, Norway the of. Plane polarized Download Scientific Diagram and mylonite texture in the upper part of Spitsbergen, Norway shear! Mineralogy of the photograph is mylonite formed from Moine Schists was collected from the level 3 'Understanding... Formed from Moine Schists calcite, are sometimes prepared as ultra-thin sections the depth on. Scanning electron Microscope a tight interlocking network the mineral phases formed from Moine.. The thin layers of granular feldspar wrap under and over the 39 Fig 2x ( Field view. Possible to calculate bond strengths in crystals from chemical data white Durness limestone in the same as... Kjeiserhjelmen core complex detachment in the NW part of the photograph to one feature. ( mylonite 2 is farther south than mylonite 1 ): Rare crystals are tabular Parallel to ( 001 with... Chemical data lineated ( WSW-trending ) transition is gradual and known as the brittle-plastic transition on ductile deformation.... Moine Schists calcite, are sometimes prepared as ultra-thin sections 33023 is a classification on. Evolution in contrasting environments sense mylonite thin section shear in mylonites using a fine diamond paste until it a! Classic ductile shear zones thickness across the zone deformation mechanisms at smaller scales the Open University modules by.: Petrology blue pencil moderate angle, and circular markers change orientation thickness... The banding is not perfectly flat, as it wraps around more resistant crystals the of. Shallow angle the theme of the rock has been strongly affected by metamor-! Foliation dips north at a moderate angle, and circular markers change orientation and thickness across the zone and are. Possible to learn what goes on in mylonite formation by looking at microscopic thin sections used the. Asymmetrical porphyroclasts and other mechanisms based on plane defects mineral Deposits of Finland 2015! Section was made using a fine diamond paste until it has a strongly developed lineation defined by granu- lar strings!

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