Metamorphic petrology. Chapter 14, 15, 16, 18 Metamorphic rock: aggregate of minerals; composition and fabric reflect changes to new states to adjust to changes in P, T and X and stress. (these rocks are very dense) Types of Regional Metamorphism Pressure from being squished by other sediments Pressure from plate movement (mountain building) Texture of Metamorphic Rocks Foliated Metamorphic Rocks - rock has a layered or banded appearance. Title: Chapter 22: A Classification of Metamorphic Rocks 1 Chapter 22 A Classification of Metamorphic Rocks A good name is a concise way of imparting information about a rock 2. metamorphic 2 Metamorphic rocks are classified according to their source rock type, structure, microstructure and mineral scheme for Classification of Igneous Rocks and the • Identify how the textures of metamorphic rocks … Journal of Petrology, 2, 277–311. Metamorphic Rocks. Evolotion of metamorphic belts. Figure 23-48a. Metamorphic Structures and Textures • Structure – features that characterize handspecimen or larger masses of rock. 3.1 ROCK CYCLE • A rock is an aggregate of minerals and can be formed by many different processes. The most important non-foliated rock is marble. Typically metamorphic rocks develop some kind of metamorphic fabric during the metamorphic event(s). [This paper presents the foundation for the recognition of metamorphic rocks in the various tectonic settings.] Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Parent rock: protolith Metamorphism: path from protolith to final rock. Even if a complex assemblage is not identifiable at the wellsite, a combination of minerals and textures should allow the rock to be characterized. Oxford: Pergamon. The fabric can be either a planar fabric, called “foliation”, or a linear fabric, called “lineation”. Driving force: increasing P and T Upper limit: dependent on composition; igneous and metamorphic processes overlap in heterogeneous bodies. A hornfels rock is characterized by evenly distributed, very fine‐grained mica crystals that give it a more massive, equigranular appearance. Igneous Rocks Igneous rocks are formed by A. The rock has split from bedrock along this foliation plane, and you can see that other weaknesses are present in the same orientation. Figure 9 – 4. (D), metamorphism (M), mineral growth, and textures in the rock illustrated in Figure 23-46. [This is a book that presents all the • Describe how metamorphic rocks are produced by the action of heat, pressure, and fluids on preexisting parent rocks over the course of time. • Some are formed from melts (igneous), by solidifying sediments like sand or clay (sedimentary) and by re-crystallising previously formed rocks in its solid state (metamorphic). (1969). Miyashiro A. Pergamon. Metamorphic rocks are classified on the basis of texture and composition (either mineralogical or chemical) Unlike igneous rocks, which have been plagued by TEXTURE GRAIN medium Medium Fine Fine Fine coarse Scheme for Metamorphic Rock Identification MAP SYMBOL TYPE OF COMPOSITION METAMORPHISM COMMENTS Low-g rade metamorphism of shale Foliation surfaces shiny ... Microsoft PowerPoint - Metamorphic Rocks.ppt Author: Earth Science 7-Metamorphic Rock-(2)Structure and Texture - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. The texture of a metamorphic rock is a unique product of its mineralogy and metamorphic conditions. In general, the grain size of metamorphic rocks tends to increase with increasing grade of metamorphism, as seen in the progression form fine grained shales to coarser (but still fine) grained slates, to coarser grained schists and gneisses. 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