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Science 13 July 2001:
Vol. 293. no. 5528, pp. 281 - 283
DOI: 10.1126/science.1059663
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Reports

Melt Production Beneath Mt. Shasta from Boron Data in Primitive Melt Inclusions

Estelle F. Rose,1*dagger Nobumichi Shimizu,1 Graham D. Layne,1 Timothy L. Grove2

Most arc magmas are thought to be generated by partial melting of the mantle wedge induced by infiltration of slab-derived fluids. However, partial melting of subducting oceanic crust has also been proposed to contribute to the melt generation process, especially when young and hot lithosphere is being subducted. The isotopic composition of boron measured in situ in olivine-hosted primitive melt inclusions in a basaltic andesite from Mt. Shasta, California, is characterized by large negative values that are also highly variable (delta 11B = -21.3 to -0.9 per mil). The boron concentrations, from 0.7 to 1.6 parts per million, are lower than in most other arc lavas. The relation between concentration and isotopic composition of boron observed here supports a hypothesis that materials left after dehydration of the subducting slab may have contributed to the generation of basaltic andesite lavas at Mt. Shasta.

1 Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
2 Department of Earth, Atmosphere and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
*   Present address: Institute for Study of the Earth's Interior-PML, Okayama University at Misasa, Tottori-ken, 682-0193, Japan.

dagger    To whom correspondence should be addressed. E-mail: erose{at}pheasant.misasa.okayama-u.ac.jp

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Slab-Derived Fluids in the Magma Sources of St. Vincent (Lesser Antilles Arc): Volatile and Light Element Imprints.
A.-S. Bouvier, N. Metrich, and E. Deloule (2008)
J. Petrology 49, 1427-1448
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Melt Inclusions in Basaltic and Related Volcanic Rocks.
A. J.R. Kent (2008)
Reviews in Mineralogy and Geochemistry 69, 273-331
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Petrogenesis of Mafic Garnet Granulite in the Lower Crust of the Kohistan Paleo-arc Complex (Northern Pakistan): Implications for Intra-crustal Differentiation of Island Arcs and Generation of Continental Crust.
C. J. GARRIDO, J.-L. BODINIER, J.-P. BURG, G. ZEILINGER, S. S. HUSSAIN, H. DAWOOD, M. N. CHAUDHRY, and F. GERVILLA (2006)
J. Petrology 47, 1873-1914
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A Melt Inclusion Record of Volatiles, Trace Elements and Li-B Isotope Variations in a Single Magma System from the Plat Pays Volcanic Complex, Dominica, Lesser Antilles.
A. A. GURENKO, R. B. TRUMBULL, R. THOMAS, and J. M. LINDSAY (2005)
J. Petrology 46, 2495-2526
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Record in metamorphic tourmalines of subduction-zone devolatilization and boron cycling.
G. E. Bebout and E. Nakamura (2003)
Geology 31, 407-410
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Compositional variations within scoria cones.
M. Strong and J. Wolff (2003)
Geology 31, 143-146
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Isotopic and elemental partitioning of boron between hydrous fluid and silicate melt.
R. L. Hervig, G. M. Moore, L. B. Williams, S. M. Peacock, J. R. Holloway, and K. Roggensack (2002)
American Mineralogist 87, 769-774
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