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Magma Processes
Magma
13
Geology
Undergraduate 2
03/14/2011

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Term
Geotherm
Definition
Rate at which the earth's temperature increases as depth increases.
Term
Heat Transfer
Definition
Increases heat and pressure stays constant. Occurs at subduction zones.
Term
Decompression
Definition
Decrease in pressure while temperature stays the same. Occurs at MOR's.
Term
Wet Melting
Definition
Water pockets get sucked under land, crates addition of heat melting. Occurs in subduction zones.
Term
Bowens Reaction Series
Definition
The sequence of mineral-producing reactions that take place in a cooling, initially mafic, magma.
Term
Felsic
Definition
Higher SiO2 concentration. Higher Na, K (Potassium). Lower Melting Point. High Silica Content.
Term
Ultramafic
Definition
Higher Fe2 and Magnesium Concentrations. Higher Melting Point. Low Silica Content.
Term
MOR is for felsic or mafic?
Definition
Mafic
Term
Subduction zone is more felsic or mafic?
Definition
Felsic
Term
Fractional Crystallization
Definition
Process of progressive crystal formation, it progressively extracts iron and magnesium making the magma more felsic.
Term
Assimilation
Definition
Magma composition is altered though the corporation of surrounding rock.
Term
Partial Melting
Definition
Melt is more felsic that original rock.
Felsic: High silica concentration. Low Melting Point.
Mafic: Low silica concentration. High Melting Point.
Term
Magma Migration
Definition
Magma rises as density decreases. Occurs in fractures of country rock, allowing magma to flow up the fractures.
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