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How do mantle rocks melt ?. Adding water to the system: flux melting Decompress the rocks- decompression melting Heating. Path 2. Path 3. Path 1. Magmatic activity and plate tectonic setting. Liquid line of descent. How do igneous rocks evolve?. Fractional crystallization. - PowerPoint PPT Presentation
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How do mantle rocks melt ?Adding water to the system: flux meltingDecompress the rocks- decompression meltingHeatingPath 1Path 2Path 3
Magmatic activity and plate tectonic setting
Liquid line of descent
How do igneous rocks evolve?Fractional crystallization
How do igneous rocks evolve?Fractional crystallization
How do igneous rocks evolve?Fractional crystallization
Igneous TexturesPhaneriticAphaniticPorhpyriticGlassyVesicular Pyroclastic
PhaneriticPhaneritic individual grains in an igneous rock are large enough to be identified without the aid of a microscope
Aphanitic
Aphanitic individual minerals are present in the igneous rock but in particles so small that they cannot be identified without a microscope
PorhpyriticPorphyritic-igneous texture referring to relatively large isolated crystals in a mass of fine texture (aphanitic) groundmass
GlassyGlassy textured igneous rocks are non-crystalline.Generally indicate very rapid cooling.
Vesicular Vesicular Texture characterized by Vesicles (holes, pores, or cavities) within the igneous rock. Vesicles are the result of gas expansion (bubbles). Bubbles can by filled by secondary minerals due to fluid infiltration(Amygdule).
PyroclasticPyroclastic composed chiefly of (variable) rock fragments.
Gabbro
Granite
Andesite
Classifying igneous rocks
Streckeisen diagram (1974)