petrology chapter-6

Petrology Chapter-6Gautam Sen

Classification of Basalts

AFM Diagram

Crystal Settling vs. Flotation

Crystal-liquid movement in a thick sill

Palaisades Sill, NJ

Picture credit: Kevin Chau, FIU

Origin of Lunar Highlands anorthosite by crystal flotation in a magma ocean

In situ Crystallization

Crystallization in a magma chamber simulated with An-Fo-Silica @ 1 GPa

Development of layers by in situ crystallization

Convection

Flowage Differentiaton

Liquid immiscibility

Exsolution of Vapor from Magma

Kilauea lava variation

Interpreting Oxide-Oxide variations

Trace element variation in melt with crystallization

RTF Process

Deccan Traps Stratigraphy & Isotope variation

Assimilation-Fractional Crystallization

AFM Diagram for the Skaergaard Intrusion

Cumulate Types

Layering

Skaergaard Intrusion – Map & Cross-section

Skaergaard “Stratigraphy”

Pressure and crystallization

Simplified map of the Bushveld Intrusion

Bushveld “Stratigrahy”

Olivine Gap

Bushveld Pyroxenes

Herringbone texture in inverted pigeonite

Pyroxene Inversions