Stable isotope compositions and water contents of boninite series volcanic rocks from Chichi-jima, Bonin Islands, Japan
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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‰ in18O during differentiation is explained by crystallization of18O-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.
Suggested Citation
Dobson, P., O’Neil, J.R., 1987, Stable isotope compositions and water contents of boninite series volcanic rocks from Chichi-jima, Bonin Islands, Japan: Earth and Planetary Science Letters, v. 82, no. 1-2, p. 75-86, https://doi.org/10.1016/0012-821X(87)90108-7.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Stable isotope compositions and water contents of boninite series volcanic rocks from Chichi-jima, Bonin Islands, Japan |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/0012-821X(87)90108-7 |
| Volume | 82 |
| Issue | 1-2 |
| Year Published | 1987 |
| Language | English |
| Publisher | Elsevier |
| Description | 12 p. |
| First page | 75 |
| Last page | 86 |