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Evolusi Magma.pdf

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1 EVOLUSI MAGMA 1. Diferensiasi magma Fraksinasi kristalisasi (gravity settling, filter pressing) Liquid immiscibility 2. Magma mixing 3. Asimilasi EVOLUSI MAGMA 1. Diferensiasi magma Fraksinasi kristalisasi (gravity settling, filter pressing) Liquid immiscibility 2. Magma mixing 3. Asimilasi 2 Fractional crystallization in the Palisades Sill (200 Ma) on theHudson River Fm. Fractionation from an initial homogeneous magma resulted from the settling of early-formed crystals of olivine and the
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  1 EVOLUSI MAGMA 1.Diferensiasimagma Fraksinasikristalisasi(gravity settling, filter pressing)Liquid immiscibility 2.Magma mixing3.Asimilasi EVOLUSI MAGMA 1.Diferensiasimagma Fraksinasikristalisasi(gravity settling, filter pressing)Liquid immiscibility  2.Magma mixing3.Asimilasi  2 Fractional crystallization in the Palisades Sill (200 Ma) on theHudson River Fm. Fractionation from an initial homogeneous magma resulted from the settling of early-formed crystals of olivine and then pyroxene from the residual melt.  3 X1. For bulk composition X, liquid cools to liquidusat 1600°CP = 1 atm2. Fobegins to crystallize3. Liquid composition moves directly away from Fo4. Liquid composition reaches cotectic; Dibegins to crystallize with Fo5. Co-precipitation of Fo+ Dicauses liquid composition to move down cotecticcurve6. Liquid composition reaches ternary eutectic at 1270°C; An begins to crystallize with Di+ Fo7. Liquid is consumed;  An + Di+ Focool below 1270°C  4 Gravity settling  –Cool point a  olivine layer at base of pluton if first olivine sinks –Next: ol+ cpxlayer  –Finally: ol+ cpx+ plagCumulate texture:Mutually touching phenocrysts with interstitial crystallized residual melt 121722  Al 2 O 3 0510 MgO 0510 FeO* 0246 Na 2 O 051015 CaO 4550556065707501234 K 2 OSiO 2 45505560657075 SiO 2 Bivariate (x-y) diagrams Harker Diagram  –major elements for Crater Lake.From Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Prentice Hall.
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