Trace elements ocean island basalts

Weaver BL (1991) The origin of ocean island basalt end-member compositions trace element and isotopic constraints. Earth Planet Sci Lett 104 381-397... 

Year One Refinement of sample preparation and analytical techniques for trace element analysis in ocean island basalts using existing samples from the Galapagos. Compilation of existing geochemical data for Pinta and Marchena Islands. Training of students in analytical techniques, preparation for fieldwork. 

Bohrson W. A. and Reid M. R. (1995) Petrogenesis of alkaline basalts from Socorro Island, Mexico trace element evidence for contamination of ocean island basalt in the shallow ocean crust. J. Geophys. Res. 100(B12), 24555-24576. 

Figure 2 Primitive-mantle normalized minor and trace-element diagrams for (a) the upper, middle, bulk, and lower continental crust (values from Table 1), and (b) oceanic and island arc basalts and the bulk continental crust (all normalizing values are from McDonough and Sun, 1995). The oceanic basalts (N-MORB, normal mid-ocean ridge basalt and OIB, ocean island basalt) are from Sun and McDonough (1989), whereas the arc basalts are from Turner et al. (1997) (Tonga-Kermadec arc) and Pearce et al. (1995) (South Sandwich arc).

Kogiso T., Tatsumi Y., and Nakano S. (1997) Trace element transport during dehydration processes in the subducted oceanic crust 1. Experiments and implications for the origin of ocean island basalts. Earth Planet. Sci. Lett. 148, 193-205. 

Hauii EH (1996) Major-element variability in the Hawaiian plume. Nature 382 415-419 Hauri EH, Hart SR (1993) Re-Os isotope systematics of EMU and HIMU ocean island basalts from the south Pacific Ocean. Earth Planet Sci Letters 114 353-371 Hemond C, Arndt NT, Lichtenstein U, Hofmarm AW, Oskarsson N, Steinthorsson S (1993) The heterogeneous Iceland plume Nd-Sr-O isotopes and trace element constraints. J Geophys Res 98(B9) 15,833-15,850... 

Weaver BL (1991) Trace element evidence for the origin of ocean-island basalts. Geology 19 123-126 Wetherill GW (1954) Variations in the isotopic abundances of neon and argon extracted from radioactive minerals. Phys Rev 96 679-683... 

Arndt et al. (1997) compared the compositions of Archaean tholeiites with those of modern basalts from ocean-ridge, ocean-island, and arc environments (Fig. 3.22). They showed that Archaean tholeiites have higher SiOa and FeO, and lower incompatible trace element concentrations (although enriched in Rb and Ba relative to modern MORB), compared to their modern equivalents. Many of these geochemical features of Archaean basalts match those of modern arc basalts, but there are also important differences. This led Arndt et al. (1997) to the important conclusion that "the major- and trace-element characteristics of Archaean basalts are matched by no common type of modern basalt." The uniqueness of Archaean tholeiitic basalts requires that they are either from a source different from that of modern tholeiites, or are the product of a different melting process. Arndt et al. (1997) interpreted the low incompatible trace element concentrations and high Si, Fe, Ni,... 

F2O5 diagram of (1975) is that it daims to differentiate between oceanic and continental basalts. T.B. Pearce Most trace element discriminant plots allocate ocean-island and continental-flood... 

Basalts, basaltic andesites, and andesites with this distribution are common in some island arcs (e.g., Jakes and Gill, 1970 Ewart et al., 1973 Taylor et al., 1969). Their presence is believed to result from melting of subducted oceanic crust. By and large, the sediment layers which lie above the ocean floor tholeiites and are derived mainly from continental material are not subducted but piled up against continental margins in some manner that prevents their modifying significantly the trace element and isotopic abundances of oceanic crustal matter in the production of this class of island arc volcanics. Nor does ocean water severely modify the lanthanide distributions in volcanics that are extruded under... 

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