Rock Density (g/cc) Viscosity (Pa s) Rhyolite 2.41 10 7 -10 10 Diorite 2.49 10 4 -10 7 Andesite 2.57 10 2 -10 4 Basalt 2.70 10 1 -10 2 Water 1.00 10 -3 Density Largely controlled by composition (see above) Secondary control by temperature (heat causes bonds to lengthen and density decrease) Effect of temperature offset by compositional differences (hot magmas are more Fe-rich and denser) Controls ascent of magmas and separation form source regions (bouyancy) Crust acts a a "density filter" prevents heavy magmas from reaching surface Magma density controls whether crystallizing minerals will sink or flow (also a function of viscosity) Formation of Magma Conditions affect melting temperatures (T m ): Increased pressure, increases T m ;
(2 Water 1.00 10 -3 Density; Largely controlled; by composition (see above) Secondary control by temperature (heat causes bonds to lengthen and density decrease) Effect of temperature offset by compositional differences) Context(2 Water 1.00 10 - 3 Density Largely controlled,List([133, 178))):(crystallizing minerals; will sink; ) (heavy magmas; from reaching; surface Magma density controls) (Formation of Magma Conditions; affect; melting temperatures) (heat; causes; bonds to lengthen and density decrease) Context(heat causes,List([240, 251))):(bonds; to lengthen; ) (bouyancy) Crust; acts; a a "density filter) (increases; m; T) (Controls ascent of magmas and separation form source regions; prevents; heavy magmas; from reaching surface Magma density controls) Context(Controls ascent of magmas and separation form source regions prevents,List([391, 503))):(hot magmas; are; more Fe-rich and denser) (bonds; to density; decrease)
2 Water 1.00 10 - 3 Density Largely controlled,List([133, 178)) heat causes,List([240, 251)) Controls ascent of magmas and separation form source regions prevents,List([391, 503))
2 Water 1.00 10 -3 Density crystallizing minerals heavy magmas Formation of Magma Conditions heat bonds bouyancy) Crust increases Controls ascent of magmas and separation form source regions hot magmas bonds
Largely controlled will sink from reaching affect causes to lengthen acts m prevents are to density
by composition (see above) Secondary control by temperature (heat causes bonds to lengthen and density decrease) Effect of temperature offset by compositional differences
surface Magma density controls
melting temperatures
bonds to lengthen and density decrease
a a "density filter
T
heavy magmas from reaching surface Magma density controls
more Fe-rich and denser
decrease