EARTHSC 1108 Lecture Notes - Lecture 19: Extrusive Rock, Aureola, Grossular
1 Dec 2016
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Marble: linked by the rock cycle". Rocks re-heated to high temperature and pressure: rocks reheated and react, starting rocks (protolith) can be igneous, often form at subduction zones, classified by. Burial and subduction of rocks at convergent plate margin. Reheating of host rock by igneous intrusion. Sometimes aureole is only 10s of meters across: produce very different assemblages of minerals. Group of closely-related minerals: name: garnet is grain (latin) and pomegranate seed, deep red , large variation in chemistry. A and b can be many different elements. Mg, fe, ca, al, mn, ti, cr, va: complex set of mineral names (for reference only) Mixture of: hard cations (mg, ca, soft cations (al, si, anions (o, transitional metals (mn, ti, cr, va, structural formula: a3b2si3o12. A = cations (hard, soft or trans. B = cation (hard, soft or trans. Closely-related group of silicates: common minerals in metamorphic rocks worldwide.
