Metamorphic Textures Thin Section
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Thin Section Of Muscovite Defining A Strong Schistosity Great Alignment Of Crystals From Metamorphic Stress Rocks And Minerals Metamorphic Rocks Muscovite
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Metamorphic Rock Phyllite In Microscope Two Nicols Zoom 100 Times 100 Parts On Scale Is 1 Cm Metamorphic Rocks Metamorphic Geology
Thin Section Of A Nicely Crenulated Mica Schist From The Norwegian Caledonides Geology Mineralogy Schist
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Metamorphic rocks thin sections.
Metamorphic textures thin section. This talc crystal has been rotated to extinction but there are many small areas in the central grain that are not extinct because of surface damage caused by the thin section grinding process. Plane polarised light width of view 2 5 mm. A last look at igneous minerals in thin section dexter perkins univ.
Students look at some of the same minerals and others in thin section. 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. Introduction to metamorphism read chapter 1 of an introduction to metamorphic petrology by bruce yardley or chapters 22 23 of igneous and metamorphic petrology by john winter or chapter 16 of igneous and metamorphic petrology by philpotts.
Fault rocks 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. A final lab exercise that uses the optical mineralogy skills learned in the previous labs and begins the transition to petrographic analysis of thin sections. Rock with quartz garnet hornblende muscovite.
Academia edu is a platform for academics to share research papers. Talcin a soapstone metamorphosed harzbergite. All images have two views in plane and cross polarized light.
These are photomicrographs very thin slices of rock seen in plane polarised light or between crossed polarisers when the colours seen are produced by interference of light. Porphyroblasts are a valuable source of information on local tectonic and metamorphic evolution. Rock forming minerals of metamorphic rocks in thin section a work in progress 1 olivine.
What is metamorphism and why study it. Refers to changes in rock texture or mineralogy. Incompletely formed crystals that are best seen in thin section this is created as crystals are forming hollow dendritic or branching habits broken crystals early formed phenocrysts that have been broken by movement of magma.
Collection Of Metamorphic Textures Here Poikioblastic Texture
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Mica Var Muscovite In Xpl In A Phyllite Note The High Birefringence And Alignment Of The Grains Metamorphic Metamorphic Rocks Rock
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Andalusite Porphyroblast With Poikiloblastic Texture Also Note How The Foliation Oriented Roughly N S In This View I Andalusite Metamorphic Rocks Metamorphic
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Sutured Boundary Between Quartz Geology Texture Metamorphic
Granoblastic Texture Formed By Corderite Xpl Granoblastic An Equigranular Texture In Which Crystals Adopt A Polygonal Metamorphic Minerals Fabric Textures
Schist In Xpl Showing Garnet Black Mica Bright And Quartz Gray White Minerals Garnet Geology
Gabbro Thin Section Microscopic Photography Art Abstract
Serpentine In Xpl Replacing Olivine In A Marble Metamorphic Olivine Serpentine
Idioblastic Poikioblastic Garnet In Ppl Minerals Metamorphic Metamorphic Rocks
Cpx Var Diopside In Xpl Metamorphic Diopside Minerals
