Lecture Earth Materials-II

Lecture Earth Materials-II - Rock classification based on...

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What is a rock? Rock = solid made of a collection of one or more minerals, rock particles, and sometimes matrix cements.
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Three Rock Types: Igneous : Latin ignis = fire; form from cooling of melted rock. Sedimentary : Latin sedimentum = settling. Form from deposition and cementation of rock particles and/or cements. Metamorphic : Greek meta = change and morphe = form. Change mineralogy in rock due to changing P-T conditions.
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Relative Importance of Different Rock Types Around 75% of lithosphere made up of igneous rocks; Around 20% metamorphic; Only 5% by volume of the earths crust made of sedimentary rock. But latter covers much of surface. And important source of resources.
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Unformatted text preview: Rock classification based on both composition and texture. Composition: Use minerals or chemistry (oxides or elements). Rock Texture = Size and arrangement of grains or crystals. Both give clues about how and where rock formed. Rock Cycle & Plate Tectonics Processes: How Does Nature Do This? Melting, Ascent, & Eruption of Magma? Emplacement Of plutons? Get Rocks to Surface & Break Them Apart? Form Sedimentary Layers? Make Rocks Change & Flow? Rock Cycle in Arc Setting Next Topic Processes that form rocks Igneous Sedimentary Metamorphic Please stop me and ask questions. To better understand the language of geology! Best way to learn! Slows me down!...
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Lecture Earth Materials-II - Rock classification based on...

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