Island-arc lavas

Morris JD, Leeman BW, Tera F (1990) The subducted component in island arc lavas constraints from Be isotopes and B-Be systematics. Nature 344 31-36... 

Newman S, Macdougall JD, Finkel RC (1984) 23<>pii- U disequilibrium in island arc lavas evidence from the Aleutians and the Marianas. Nature 308 266-270... 

Wendt Jl, Regelous M, Collerson KD, Ewart A (1997) Evidence for a contribution from two mantle plumes to island arc lavas from northern Tonga. Geology 25 611-614 Williams RW, Gill JB (1989) Effects of partial melting on the uranium decay series. Geochim Cosmochim Acta 53 1607-1619... 

Figure 4 Magma storage times based on timescales of magma differentiation, (a) Plot showing variation in the activity ratio of Ra to in island arc lavas at the time of eruption, plotted as a function of Si02. Island arc lavas are chosen because mafic, possibly parental, magmas can have very high ratio and because the...

Feineman M. D. and DePaolo D. J. (2002) A diffusion-decay model for steady-state U-series disequilibrium in the mantle with implications for island arc lavas. EOS, Trans., AGU 83(47) Fall Meet. Suppl. 

Gill JB, Morris JD, Johnson RW (1993) Timescale for producing the geochemical signature of island arc magmas U-Th-Po and Be-B systematics in Recent Papua New Guinea lavas. Geoehim Cosmochim Acta 57 4269-4283... 

Tinner S, Foden J (2001) U, Th and Ra disequilibria, Sr, Nd and Pb isotope and trace element variations in Sunda arc lavas predominance of a subducted sediment component. Contrib Mineral Petrol 142 43-57 Turner S, Evans P, Hawkesworth C, (2001) Ultra-fast source-to-surface movement of melt at island arcs from Ra- °Th systematics. Science 292 1363-1366... 

Schiano P, Clocchiatti R, Ottolini L, Busa T (2001) Transition of Mount Etna lavas from a mantle-plume to an island-arc magmatic source. Nature 412 900-... 

Kent A. J. R. and Elliott T. R. (2002) Melt inclusions from Marianas arc lavas implications for the composition and formation of island arc magmas. Chem. Geol. 183,263-286. 

Kelemen P. B., YogodzinsM G. M., and Scholl D. W. (2003b) Along strike variation in lavas of the Aleutian island arc implications for the genesis of high Mg andesite and the continental crust. In AGU Monograph (ed. J. Eiler). American Geophysical Union, (in press). 

Hydrothermal flnids at immatnre back-arc rifts, which occnr behind island-arcs in areas where oceanic crust is being snbdncted (Fig. 13.13), clearly reflect the compositional differences of the source rocks (fractionated, calc-alkaline snites versus MORE). The fluids at immature back-arcs are typically enriched in Zn, Pb, As and Ba (and depleted in Fe) compared to mid-ocean ridge flnids, which is related to the higher concentrations of these elements in the associated lavas (Herzig and Haimington 1995 Table 13.5). 

MORB-like He/ He values (see references in Table 4). Specifically, lavas with He/ He values of8 l are erupted in the central Lau Basin as well as along all spreading centers of the North Fiji Basin. Therefore, in addition to a contribution from a deep mantle plume, the other principal source of helium in active back-arc basins is the same as that supplying mid-ocean ridges. This conclusion reinforces that derived from the majority of island arc studies—namely, that the mantle is the predominant source of helium in subduction zone environments with little or no contribution from the subducted slab. 

Chayes and Velde (1965) used discriminant analysis to subdivide basaltic lavas found in ocean islands from those of island arcs on the basis of their major element... 

The different basalt fields are subdivided according to Ti/V ratio (Figure 5.10). MORB plote between Ti/V ratios of 20 and 50, although there is considerable overlap with the fields of continental flood basalt and back-arc basin basalts. Ocean-island and alkali basalts plot between Ti/V ratios of 50 and 100. Island-arc tholeiites plot between Ti/V ratios of 10 and 20 with a small overlap onto the field of MORB, Calc-alkali lavas plot with a near-vertical trend and with Ti/V ratios between 15 and 50. 

Wilson TJ (1995) Cenozoic transtension along the Transantarctic Mountains - West Antarctic rift boundary, southern Victoria Land, Antarctica. Tectonics 14(2) 531-545 Womer G (1992) Kirkpatrick lavas. Exposure HUl Formation and Ferrar sills in the Prince Albert Mountains, Victoria Land, Antarctica. Polarforschung 60(2) 87-90 Wbmer G, Schmincke H-U (1984) Petrogenesis of the zoned Laacher See tephra sequence. J Petrol 25 836-851 Yanagi T, Ishizaka K (1978) Batch fractionation model for the evolution of volcanic rocks in an island arc An example from central Japan. Earth Planet Sci Lett 40 252-262 Zolotukhin VV, Al Mukhamedov AI (1988) Traps of the Siberian platform. In Macdougall JD (ed) Continental flood Basalts. Kluwer, Dordrecht, The Netherlands, pp 273-310... 

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