Download Algebraic Groups and Discontinuous Subgroups: Proceedings of by editors Armand Borel & George D. Mostow PDF

By editors Armand Borel & George D. Mostow

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The data presentedin Figure I are prntrusiveproductsand by eruptive lifetimescommonlyin excess cipallya frameworkfor discussion, and the sheetsselectedas of 106years. examplesreflectlittle morethan the availabilityof my own or publisheddata. Other patterns of compositionalzonation Temperature probablyexist,sothe discussion hereis only a progressreport. Aside alkalinity, but trace-elementgradientsare progressivelystee- from the units for which points are actually plotted, each data per in more alkalic and in high-silicasystems(Figure 2).

Ascentof bubblesin the aftermathof eruptive mina by less than 1 wt. %. (2) Several elements especially leaks cannot be excluded as a transient mechanism, nor can likely to form complexions, Nb, Ta, As, Sb, Mo, W, Th, and transportof H20 andothercomponents by CO2-richbubbles U, were stronglyenrichedroofward. The relativeimportance of diffusive of magnitudeor more. (5) Na was enrichedupward along andvapor-phase transport will be takenup againbelowafter with Li, Rb, Cs, T1, and Pb, all being antithetic to K.

Otherkindsof gradients in magmachambers. ' GRADIENTS IN SILICIC MAGMA CHAMBERS 10161 -lO -i5 _20 I , ,t I 700 -' LCT , I , 800 I 900 • I , 1000 TøC Fig. 3. Thick linesare the trendsdefinedby 20 to 80 samples eachfrom the followingunits:BT, BishopTuff [Hildreth,1977];K, 1912eruptionin the Valley of Ten ThousandSmokes [Hildrethand Grunder,1980];M, climacticeruptionof Mt. Mazama (W. Hildreth, unpublisheddata, 1976);LCT and HRT Lava CreekTuff and HuckleberryRidge Tuff, Yellowstone(Christiansen and Blank [1972];W.

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