Pyx ol slope of low k dm dm v some even more depleted

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Unformatted text preview: of low-K → DM (+) DM v Some even more depleted than Some MORB MORB Others have more normal Others slopes slopes 3 Thus heterogeneous mantle Thus heterogeneous sources sources 3 HREE flat, so no deep HREE Figure 16-10. arnet garnet for some representative Low-K gREE diagrams 3 (tholeiitic), Medium-K (calc-alkaline), and High-K basaltic andesites and andesites. An N-MORB is included for reference (from Sun and McDonough, 1989). After Gill (1981) Orogenic Andesites and Plate Tectonics. Springer-Verlag. q MORB-normalized Spider diagrams 3 Intraplate OIB has typical hump Figure 14-3. Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Prentice Hall. Data from Sun and McDonough (1989) In A. D. Saunders and M. J. Norry (eds.), Magmatism in the Ocean Basins. Geol. Soc. London Spec. Publ., 42. pp. 313-345. q MORB-normalized Spider diagrams IA: decoupled HFS - LIL (LIL are hydrophilic) What is it about subduction zone setting that What causes fluid-assisted enrichment? fluid-assisted 3 Figure 14-3. Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Prentice Hall. Data from Sun and McDonough (1989) In A. D. Saunders and M. J. Norry (eds.), Magmatism in the Ocean Basins. Geol. Soc. London Spec. Publ., 42. pp. 313-345. Figure 16-11a. MORB-normalized spider diagrams for selected island arc basalts. Using the normalization and ordering scheme of Pearce (1983) with LIL on the left and HFS on the right and compatibility increasing outward from Ba-Th. Data from BVTP. Composite OIB from Fig 14-3 in yellow. Isotopes q New Britain, Marianas, Aleutians, and South Sandwich New volcanics plot within a surprisingly limited range of DM volcanics Figure 16-12. Nd-Sr isotopic variation in some island arc volcanics. MORB and mantle array from Figures 13-11 and 10-15. After Wilson (1989), Arculus and Powell (1986), Gill (1981), and McCulloch et al. (1994). Atlantic sediment da...
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