GEOS 306 Final: GEOS 306 University of Arizona Final 2009
31 Jan 2019
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2009 final (200 pts: (20 pts, what are the 4 most abundant elements in the earth and what are their atomic percentages, use these percentages to compute the maximum abundance of perovskite and magnesio-wustite in the lower mantle. 1: (10 pts) apply pauling"s rules to quartz and stishovite and estimate which si-o bond length is longer and which mineral has the stronger sio bonds. 2: (20 pts) the following diagram is the phase diagram for silica, label the various regions, suppose a diamond crystal was found with a coesite inclusion. Plot the geotherm onto the silica phase diagram and estimate the minimum depth that the diamond had to have come from. Use the following table for your estimate of the geotherm: 3: (20 pts) enstatite, mgsio3, is an orthopyroxene with cell edges a = 18. 23 , b = 8. 84 , c = 5. 19 and z = 16.
