petrogenetic principles of metamorphic rocks.] Texture Rock Name Diagnostic Features ... SCORIA is a vesicular igneous rock of fine or glassy texture, usually of basaltic composition. Foliation in metamorphic rocks occurs when the … Academia.edu is a platform for academics to share research papers. Show a picture of the rock cycle bef ore beginning this unit. Oxford: Pergamon. Winter (2001) An Introduction to Igneous and Metamorphic Petrology. TEXTURE 1)FOLIATED a) Mineral Alignment: alignment of mineral crystals. Spry A. Illustrate how the three different types of rocks can change into another type of rock. Igneous Metamorphic. Shelley (1993) Igneous and Metamorphic Rocks Under the Microscope. Texture: Metamorphic rocks may have either foliated (layered) or non-foliated texture. Journal of Petrology, 2, 277–311. [This paper presents the foundation for the recognition of metamorphic rocks in the various tectonic settings.] Foliated texture is a pervasive layering caused by compositional layering or by the parallel orientation of platy (e.g, mica) or elongate (e.g., amphibole) mineral grains. This chapter describes different types of textures … Metamorphic rocks are the most difficu lt to understand and to identify. Metamorphic Texture, 348 pp. Foliated Rock Textures Foliation is broadly defined as any planar arrangement of mineral grains or structural features in a rock. Evolotion of metamorphic belts. [This is a book that presents all the (1969). Some gas grill manufacturers use scoria above the burners. How do we identify Metamorphic rocks? Miyashiro A. Metamorphic textures Texture refers to the size, shape, and arrangement of grains within a rock Foliation – any planar arrangement of mineral grains or structural features within a rock Examples of foliation – Parallel alignment of platy and/or elongated minerals Although metamorphic rocks are forming today, it … Analysis of Deformed Rocks Figure 23 -45. 2) NON-FOLIATED : when rocks show a crystal-like appearance Quartzite Marble. (1961). b) Banding rocks show alternating bands of light and dark color Gneiss. Metamorphic Scheme ESRT pg.7. Metamorphic Rocks All of the rocks listed below occur in Michigan. Foliation is caused by recrystallization under directed (compressional) stress. Metamorphic Rocks • Metamorphic rocks are classified on the basis of texture and composition (either mineralogical or chemical) • Unlike igneous rocks, which have been plagued by a proliferation of local and specific names, metamorphic rock names are surprisingly simple and flexible • May choose some prefix-type modifiers to attach Textures of metamorphic rocks • Excess energy present in deformed crystals (elastic), twins, surface free energy • Growth of new grains leads to decreasing free energy –release elastic energy, reduce surface to volume ratio (increase grains size, exception occurs in zones of intense shearing where a number of nuclei are formed). Chapman and Hall. Foliation can occur in both igneous and metamorphic rocks (this section will only focus on foliation in metamorphic rocks). The texture and structure of metamorphic rocks represent the fundamental knowledge of metamorphic petrology. 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