Igneous rocks

Igneous Rocks Bowen’s Reaction Series Discontinuous Reaction Magma g Differentiation The process by which magmas change over time Fractional Crystallization •Gravity •Adhering to chamber walls Fractional Crystallization Partial Melting g • Multiminerology of source magma • No single melting Temperature • Liquid has different composition than source rock k • Magma M is i enriched i h d in i constituents tit t with ith lower melting temperature (e.g., SiO2) Igneous Plumming •Cemented together fragments of preexisting rocks •Classification based on grain size • Formed as a product of inorganic chemical precipitation i it ti (l (lakes k or shallow h ll seas)) Depositional Environments Lacustrine (Lake) Glacial Alluvial (Mountain Front) Shallow Marine Fluvial (River) Eolian (Wind (Wi d Blown) Bl ) Coastal (Beach; near shore) Coastal Swamp Deep Sea Deltaic [...]... from a high concentration of H2O in the magma • Source for many precious gems and minerals Dikes - Narrow tabular body of igneous rocks g stratification that are discordant with existing Narrow tabular body of igneous rocks that are concordant with existing stratification Igneous Plumming