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CVL 423 (1)
Lecture 5

geology key terms lecture 5-11.pdf

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Civil Engineering
CVL 423
Chris Rogers

Lecture 5 Metamorphic Rocks Metamorphism derives from Greek meta to change morpho shape metamorphic rocks result from transformation of igneous and sedimentary rocks by metamorphic processes in Earths crust and mantle can from by recrystallization or react with one another Agents of Metamorphism heat pressure fluid activityContactthermal Metamorphism intruded magma heats up and alters surrounding rockDynamicThermal Metamorphism occurs in fault zones where rocks are exposed to high dynamic acvtivities or impact events is restricted to vicinity of igneous intrusions in levels of shallow crust while lithosphere pressures actRegional Metamorphism occurs over large areas convergent plates heat and pressure and also along divergent platesSubduction Zone involve oceanic plates sliding beneath continental plate or another oceanic plate subducted plate is oceanic while subducting plate may or may not be oceanic high rates of volcanism earthquakes and mountain building subduction zones result in melting of mantle that produces volcanic arc as relatively higher for lighter rockFoliated Texture texture of metamorphic rocks in which platy and elongate mainerals are arranged in parallel fashion subjected to heat in pressure during creation lowgrade metamorphic rocks have finely foliated texture in which mineral grains are extremely tiny highergrade foliated rocks are coarse grained Realignment of Minerals Cleavage breaking or splitting of mineral crystals along planes of weaknessNonFoliated Texture texture in which there is no discernable preferred orientation of minerals consists of mosaic of roughly equidimensional minerals result from contact or regional metamorphism of rocks with no platy or elongate minerals large grain size from recrystallization sugary or shiny lustre 2 types made up of 2 or more minerals and those that mineral grains are too small to seeChlorite Mica Schist foliation or realignment of minerals in planar fashion Schist medium grade metamorphic rock shiny with individual discernable grains no larger than a few mm across metamorphic mafic rocks produce greenschist rich in chlorite and plagioclaisepeltic rocks produce a variety of schists schistose foliation or schistisitySlate lowest grade metamorphic rock peltic slate most common variety is typically dark gray or brown and uniform in colour can be split into thin sheets easily as result of slaty cleavage fine grained typical minerals are clays mica chloriteUses of Slate floors roofing billiard tables school slates and blackboards
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