Tracing the evolving flux from the subducting plate in the Tonga-Kermadec arc system using boron in volcanic glass

Peter Dominic Clift, E. Rose, N. Shimizu, G. D. Layne, A. E. Draut, M. Regelous

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The influence of fluid flux on petrogenesis in the Tonga-Kermadec Arc was investigated using ion microprobe measurements of B/Be and boron isotope ratios (B-11/B-10) to document the source and relative volumes of the fluids released from the subducting oceanic plate. We analyzed young lavas from eight different islands along the Tonga-Kermadec Are, as well as glass shards in volcanic sediments from Ocean Drilling Program (ODP) Site 840, which record the variations in the chemistry of Tonga magmatism. since 7 Ma. B/Be is variable (5.8-122), in young Tonga-Kermadec Arc lavas. In contrast, glass shards from similar to3 to 4 Ma old volcanic sediments at Site 840 have the highest B/Be values yet reported for are lavas (18-607). These values are too high to be related simply to a sediment influence on petrogenesis. Together with very high delta B-11 values (-11.6 to +37.5) for the same shards and lavas these data indicate that most of the B is derived from fluid escaped from the subducting altered Pacific oceanic crust, rather than from sediment. High delta B-11 values also reflect large degrees of isotopic fractionation in this cold fast subduction zone. Lower delta B-11 values noted in the Kermadec Arc (17 to -4.4) are related to the influence of sediment eroded from New Zealand and slower convergence. High fluid flux (B/Be) is synchronous in Tonga and the Marianas at similar to3 to 4 Ma and may be related to acceleration of the Pacific Plate just prior to this time.

The timing of maximum B/Be at 3 to 4 Ma. correlates with maximum light rare earth (LREE) and high field strength element depletion. This suggests maximum degrees of partial melting at this time. Although thinning of the arc lithosphere during rifting to form the Lau Basin is expected to influence the arc geochemistry, variable aqueous fluid flux from the subducting plate alone appears capable of explaining boron and other trace element systematics in the Tonga-Kermadec Arc with no indication of slab melting. Copyright (C) 2001 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)3347-3364
Number of pages17
JournalGeochimica et Cosmochimica Acta
Volume65
Issue number19
DOIs
Publication statusPublished - 2001

Keywords

  • ISLAND-ARC
  • ISOTOPIC COMPOSITION
  • OCEANIC-CRUST
  • SOUTHWEST PACIFIC
  • BASALT MAGMAS
  • MANTLE WEDGE
  • MARIANA ARC
  • ION PROBE
  • LAU BASIN
  • FORE-ARC

Cite this

Tracing the evolving flux from the subducting plate in the Tonga-Kermadec arc system using boron in volcanic glass. / Clift, Peter Dominic; Rose, E.; Shimizu, N.; Layne, G. D.; Draut, A. E.; Regelous, M.

In: Geochimica et Cosmochimica Acta, Vol. 65, No. 19, 2001, p. 3347-3364.

Research output: Contribution to journalArticle

Clift, Peter Dominic ; Rose, E. ; Shimizu, N. ; Layne, G. D. ; Draut, A. E. ; Regelous, M. / Tracing the evolving flux from the subducting plate in the Tonga-Kermadec arc system using boron in volcanic glass. In: Geochimica et Cosmochimica Acta. 2001 ; Vol. 65, No. 19. pp. 3347-3364.
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AU - Draut, A. E.

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N2 - The influence of fluid flux on petrogenesis in the Tonga-Kermadec Arc was investigated using ion microprobe measurements of B/Be and boron isotope ratios (B-11/B-10) to document the source and relative volumes of the fluids released from the subducting oceanic plate. We analyzed young lavas from eight different islands along the Tonga-Kermadec Are, as well as glass shards in volcanic sediments from Ocean Drilling Program (ODP) Site 840, which record the variations in the chemistry of Tonga magmatism. since 7 Ma. B/Be is variable (5.8-122), in young Tonga-Kermadec Arc lavas. In contrast, glass shards from similar to3 to 4 Ma old volcanic sediments at Site 840 have the highest B/Be values yet reported for are lavas (18-607). These values are too high to be related simply to a sediment influence on petrogenesis. Together with very high delta B-11 values (-11.6 to +37.5) for the same shards and lavas these data indicate that most of the B is derived from fluid escaped from the subducting altered Pacific oceanic crust, rather than from sediment. High delta B-11 values also reflect large degrees of isotopic fractionation in this cold fast subduction zone. Lower delta B-11 values noted in the Kermadec Arc (17 to -4.4) are related to the influence of sediment eroded from New Zealand and slower convergence. High fluid flux (B/Be) is synchronous in Tonga and the Marianas at similar to3 to 4 Ma and may be related to acceleration of the Pacific Plate just prior to this time.The timing of maximum B/Be at 3 to 4 Ma. correlates with maximum light rare earth (LREE) and high field strength element depletion. This suggests maximum degrees of partial melting at this time. Although thinning of the arc lithosphere during rifting to form the Lau Basin is expected to influence the arc geochemistry, variable aqueous fluid flux from the subducting plate alone appears capable of explaining boron and other trace element systematics in the Tonga-Kermadec Arc with no indication of slab melting. Copyright (C) 2001 Elsevier Science Ltd.

AB - The influence of fluid flux on petrogenesis in the Tonga-Kermadec Arc was investigated using ion microprobe measurements of B/Be and boron isotope ratios (B-11/B-10) to document the source and relative volumes of the fluids released from the subducting oceanic plate. We analyzed young lavas from eight different islands along the Tonga-Kermadec Are, as well as glass shards in volcanic sediments from Ocean Drilling Program (ODP) Site 840, which record the variations in the chemistry of Tonga magmatism. since 7 Ma. B/Be is variable (5.8-122), in young Tonga-Kermadec Arc lavas. In contrast, glass shards from similar to3 to 4 Ma old volcanic sediments at Site 840 have the highest B/Be values yet reported for are lavas (18-607). These values are too high to be related simply to a sediment influence on petrogenesis. Together with very high delta B-11 values (-11.6 to +37.5) for the same shards and lavas these data indicate that most of the B is derived from fluid escaped from the subducting altered Pacific oceanic crust, rather than from sediment. High delta B-11 values also reflect large degrees of isotopic fractionation in this cold fast subduction zone. Lower delta B-11 values noted in the Kermadec Arc (17 to -4.4) are related to the influence of sediment eroded from New Zealand and slower convergence. High fluid flux (B/Be) is synchronous in Tonga and the Marianas at similar to3 to 4 Ma and may be related to acceleration of the Pacific Plate just prior to this time.The timing of maximum B/Be at 3 to 4 Ma. correlates with maximum light rare earth (LREE) and high field strength element depletion. This suggests maximum degrees of partial melting at this time. Although thinning of the arc lithosphere during rifting to form the Lau Basin is expected to influence the arc geochemistry, variable aqueous fluid flux from the subducting plate alone appears capable of explaining boron and other trace element systematics in the Tonga-Kermadec Arc with no indication of slab melting. Copyright (C) 2001 Elsevier Science Ltd.

KW - ISLAND-ARC

KW - ISOTOPIC COMPOSITION

KW - OCEANIC-CRUST

KW - SOUTHWEST PACIFIC

KW - BASALT MAGMAS

KW - MANTLE WEDGE

KW - MARIANA ARC

KW - ION PROBE

KW - LAU BASIN

KW - FORE-ARC

U2 - 10.1016/S0016-7037(01)00670-6

DO - 10.1016/S0016-7037(01)00670-6

M3 - Article

VL - 65

SP - 3347

EP - 3364

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

SN - 0016-7037

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ER -