EARTHSC 1105 Lecture Notes - Lecture 15: Yosemite National Park, Intermediate Composition, Laramide Orogeny
15 Nov 2016
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Document Summary
Cool inside the earth beneath another into the mantle: limited deformation. Laramide orogeny 70-80 mya to 35- 55 mya. Intrusive vs. extrusive: subduction the downward of sideways movement of a tectonic plate, intrusive cool slowly, from large crystals. Diorite intermediate composition: extrusive cool quickly, form small crystals. Felsic high feldspar / silicate content (fel-sic) Mafic high magnesium / iron content (ma- fe: low density minerals, light in color, (cid:498)sticky(cid:499) lava/magma, (cid:498)runny(cid:499) lava/ magma, high density minerals, dark in color. Fractionation = chemical enrichment / depletion due to forming/ melting of crystals: components of a solution/ solid have different freezing / melting points, as each individual freezing/melting point is reached, that component. Dike igneous intrusion which cuts across layers. Batholith plutons relationship to its weight: glaciation of the uplifted rock, problem if batholiths form deep underground, how did they become, isotasy the hight at which the continent (cid:498)floats(cid:499) in the mantle with. Jointing fracturing in response to isostatic rebound.
