Physics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..45..237h&link_type=abstract
Earth and Planetary Science Letters, Volume 45, Issue 2, p. 237-248.
Physics
21
Scientific paper
87Sr/86Sr and 143Nd/144Nd ratios, REE, K2O, Rb and Sr are presented for a variety of basanitoids, alkalic and subalkalic basalts, and calc-alkalic rocks from the island of Grenada, Lesser Antilles. The 87Sr/86Sr ratios vary from 0.7039 to 0.7058 whereas, with one exception, the 143Nd/144Nd ratios cover a small range from 0.51282 to 0.51308. There is a reasonable correlation between Sm/Nd and 143Nd/144Nd, but not between Rb/Sr and 87Sr/86Sr. The ankaramites tend to have higher K2O and Sr contents, but lower 87Sr/86Sr ratios than the microphyric basalts. A broad negative correlation between Nd and Sr isotopes is observed but it is both displaced to relatively higher 87Sr/86Sr ratios and has a flatter slope than most of the available results on mid-ocean ridge and ocean island basalts. The high 87Sr/86Sr ratios are thought to reflect a contribution from seawater affected material in the subducted ocean crust and yet they are observed in SiO2-undersaturated rocks which are most unlikely to have been derived by melting of subducted ocean crust. This is reconciled in a model whereby the alkalic elements are preferentially released during dehydration of the subducted lithosphere and contaminate the overlying mantle source region of the arc magmas.
Arculus Richard J.
Hawkesworth Chris J.
Keith O'Nions R.
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