| Abstract: | 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 ??18O values and relatively low ??D 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 ??D values of -53 for boninite glasses are higher than those of MORB and suggest that the water was derived from subducted oceanic lithosphere. ?? 1987. |
| Genre: | Article |
| ProdID: | 70015237 |
| Citation Author: | Dobson, P. F.; O'Neil, J. R. |
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| Citation End Page: | 86 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Stable isotope compositions and water contents of boninite series volcanic rocks from Chichi-jima, Bonin Islands, Japan; 1987; Article; Journal; Earth and Planetary Science Letters; Dobson, P. F.; O‘Neil, J. R. |
| Citation Start Page: | 75 |
| Citation Volume: | 82 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Stable isotope compositions and water contents of boninite series volcanic rocks from Chichi-jima, Bonin Islands, Japan; 1987; Article; Journal; Earth and Planetary Science Letters; Dobson, P. F.; O‘Neil, J. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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