Intraplate volcanism

Sharygin W, Stoppa F, Kolesov BA (1996) Zr-Ti disilicates from the Pian di Celle volcano, Umbria, Italy. Eur J Mineral 8 1199-1212 Shaw JE, Baker JA, Menzies MA, Thirlwall MF, Ibrahim KM (2003) Petrogene-sis of the largest intraplate volcanic field on the Arabian plate (Jordan) a... 

Baker J. A., Menzies M. A., Thirlwall M. F., and MacPherson C. G. (1997) Petrogenesis of Quaternary intraplate volcanism, Sana a, Yemen implications for plume-lithosphere interaction and polybaric melt hybridization. J. Petrol. 38, 1359-1390. 

Johnson R. W., Knutson J., and Taylor S. R. (1989) Intraplate Volcanism in Eastern Australia and New Zealand. Cambridge University Press, Cambridge. 

The flux of He from intraplate volcanic systems is dominantly subaerial and so it is not possible to obtain directly time-integrated flux values for even a short geological period. While the Loihi hotspot in the Pacific is submarine, calculation of He fluxes into the ocean using ocean circulation models have not required a large flux from this location that is comparable to the He plumes seen over ridges (Gamo et al., 1987 Farley et al., 1995), although recent data has seen an extensive He plume from Loihi (Lupton, 1996). 

The He/ He ratios measured in OIB are more variable, with values both below and above that of MORE (Fig. 4). He/ He values below MORE are often associated with basalts containing Pb isotopes more radiogenic than MORE, and probably include recycled components (Kurz et al. 1982 Hanyu and Kaneoka 1998 Earfod et al. 1999). Intraplate volcanic systems with He/" He lower than MORE represent less than 10% of the OIE flux (e.g.. Sleep 1990). It is therefore typically assumed that these OIE do not represent large-scale reservoirs that must be incorporated into global noble gas models. 

REE analyses [data in ppm (wt)] of intraplate volcanic rocks, and island-arc rocks. 

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