SF State GEOL 426 - Physical conditions & Bowen’s Reaction Series (9 pages)

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Physical conditions & Bowen’s Reaction Series



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Physical conditions & Bowen’s Reaction Series

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Pages:
9
School:
San Francisco State University
Course:
Geol 426 - Mineralogy And Petrology II

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Physical conditions Bowen s Reaction Series Mafic An Fo then Fa Ens then Aug Di Ab Felsic Igneous Rocks Bowen s Reaction Series Mafic Felsic Composition of Igneous Rocks Heat Sources in the Earth 1 Heat from the early accretion and differentiation of the Earth still slowly reaching surface 2 Heat released by the radioactive breakdown of unstable nuclides Ionic charge vs radius Preference for melt Plot of ionic radius vs ionic charge for trace elements of geological interest Ionic radii are quoted for eight fold coordination to allow for comparison between elements From Rollinson 1993 Preference for mineral phase Heat flow and geothermal gradients 10 C km 16 km 24 C km Heat flow and geothermal gradients 10 C km 16 km 24 C km Base of crustal root in the Sierra 30km 300 C in the Basin Range 20km 480 C Estimating pressure increases Estimate 3 33 kbar km 1 GPa 10 kbar Figure 1 9 Estimated ranges of oceanic and continental steady state geotherms to a depth of 100 km using upper and lower limits based on heat flows measured near the surface After Sclater et al 1980 Earth Rev Geophys Space Sci 18 269 311 6 kb 12 kb To calculate A geothermal gradient from heat flow k q z T k thermal conductivity constant mediumdependent k q q z T



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