Other
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..82...75d&link_type=abstract
Earth and Planetary Science Letters, Volume 82, Issue 1-2, p. 75-86.
Other
19
Scientific paper
Measurements of stable isotope compositions and water contents of boninite series volcanic rocks from the island of Chichi-jima, Bonin Islands, Japan, confirm that a large amount (1.6-2.4 wt.%) of primary water was present in these unusual magmas. An enrichment of 0.6‰ in 18O during differentiation is explained by crystallization of 18O-depleted mafic phases. Silicic glasses have elevated δ18O values and relatively low δD values indicating that they were modified by low-temperature alteration and hydration processes. Mafic glasses, on the other hand, have for the most part retained their primary isotopic signatures since Eocene time. Primary δD values of -53 for boninite glasses are higher than those of MORB and suggest that the water was derived from subducted oceanic lithosphere.
Dobson Patrick F.
O'Neil James R.
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