U-series, SrNdPb isotope and trace-element systematics across an active island arc-continent collision zone: Implications for element transfer at the slab-wedge interface

Hoogewerff, Jurian; Bergen, Manfred J. van; Vroon, P.Z.; Hertogen, Jan; Wordel, R.; Sneyers, A.; Nasution, Asnawir; Varekamp, Johan C.; Moens, H. L.E.; Mouchel, D.

doi:10.1016/s0016-7037(97)84621-2

Cited by 106 publications

(48 citation statements)

References 60 publications

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“…Among the parameters that determine the trace-element chemistry of island-arc magmas, the transfer mechanism from slab to wedge (fluid versus melt, Ellam et al, 1988;Hoogewerff et al, 1997;Elliott et al, 1997) and the composition and quantity of subducted sediments (Plank and Langmuir, 1993) appear to be of prime importance. Variations in input from subducted material create a spectrum of island arcs between two end-members: settings with little or no supply of sediments and settings where sediment subduction is dominant.…”

Section: Introductionmentioning

confidence: 99%

Oxygen isotope systematics of the Banda Arc: low δ18O despite involvement of subducted continental material in magma genesis

Vroon

Lowry

Bergen

et al. 2001

Geochimica et Cosmochimica Acta

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Abstract-This study reports new laser fluorination oxygen isotope data for 60 volcanic rocks and 15 sediments distributed over the whole length of the Banda Arc, eastern Indonesia. O melt values (excluding Serua and Ambon) overlap with the mantle range, and are in agreement with simple two-component source-mixing models that predict 1-5% addition of subducted continental material to a depleted MORB-type source in the sub-arc mantle. This percentage is consistent with previous models based on Sr-Nd-Pb-Th-He-Hf isotope data. However, correlations between incompatible trace-element ratios and oxygen isotope systematics requires involvement of partial melts derived from subducted continental material as the major slab component rather than bulk addition. The contribution of hydrous fluids, from both subducted altered oceanic crust and continental material is probably of minor importance. Magma-mantle wedge interaction models could account for the observed low ␦ 18 O signatures, but predicted effects are difficult to distinguish from models without mantle-wedge interaction. Assimilation of arc-crust material is thought to be important for the high ␦ 18 O melt values of Serua and Ambon. AFC modelling suggests up to 20% and 80% assimilation at Serua and Ambon, respectively. Inclusions of meta-sedimentary material and whole-rock Sr-Nd isotopes point to assimilation processes at Nila, but this probably had little effect on the ␦ 18 O of phenocrysts, which record original source values. According to radiogenic isotope data, magma sources in the Banda Arc are the most heavily influenced by fluxes of subducted continental material among currently active oceanic island arcs. Hence, the results of this study suggest that high ␦ 18 O (Ͼ6.5‰) in arc lavas are difficult to reconcile with addition of subducted components to magma sources, but must reflect assimilation of arc crustal material.

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Section: Introductionmentioning

confidence: 99%

Oxygen isotope systematics of the Banda Arc: low δ18O despite involvement of subducted continental material in magma genesis

Vroon

Lowry

Bergen

et al. 2001

Geochimica et Cosmochimica Acta

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“…The following components contribute to the chemistry of arc volcanics: the wedge mantle peridotite, AOC, and overlying oceanic sediments (e.g., Hoogewerff et al, 1997). Various geochemical features of arc basalts reflect the extent of elemental flux derived from the AOC and overlying oceanic sediments, which form a major part of the subducting slab.…”

Section: Subduction Components and Wedge Mantle Compositionsmentioning

confidence: 99%

“…These island -arc -type Th concentrations would be the result of contributions from silicate melt that originated from the oceanic sediments (Hawkesworth et al,1997a(Hawkesworth et al, , 1997b. In addition, Th enrichment in arc basalts and fluid immobility (Staudigel et al, 1996) suggest that the oceanic sediments on the top of the slab must melt (Elliott et al, 1997;Hoogewerff et al, 1997;Plank and Langmuir, 1993;Ryan et al, 1995;Turner et al, 1996). We used the silicate melt composition (Table 3) of Johnson and Plank (1999) and Plank and Langmuir (1998) for the present geochemical model of dehydration and partial melting Figure 6.…”

Section: Subduction Components and Wedge Mantle Compositionsmentioning

confidence: 99%

“…However, a great number of detailed studies involving trace elements and isotopes of arc basaltic rocks have revealed the important contribution of LILEs from the subducting altered oceanic crust and overlying sedimentary cover to the mantle wedge (e.g., Morris et al, 1990;Plank and Langmuir, 1993;Reagan et al, 1994;Ryan et al, 1995;Elliott et al, 1997;Hawkesworth et al, 1997aHawkesworth et al, , 1997bHoogewerff et al, 1997;Ishikawa and Tera, 1997;Turner et al, 1998;Tatsumi and Hanyu, 2003;Moriguti et al, 2004). The altered oceanic crust (AOC) and overlying sedimentary cover, which make up the subducting slab, have been regarded as principal sources of material flux that have modified the composition of the mantle peridotite beneath each arc.…”

Section: Introductionmentioning

confidence: 99%

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Effect of subduction components on production of basalts from Tateshina volcano, central Japan: geochemical calculation of dehydration of subducting oceanic crust and partial melting of overlying sediments, and subsequent fluid-mantle interaction

Katoh

Shuto

2009

Journal of Mineralogical and Petrological Sciences

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We report the major and trace element chemistry and Sr and Nd isotopic composition of basaltic rocks from the Quaternary Tateshina volcano, central Japan, and model the composition of these rocks in terms of the partial melting and melt -solid reactions controlled by the addition of slab -derived fluid and silicate melt to the original wedge mantle beneath the Tateshina area. Tateshina basaltic rocks have a SiO 2 content ranging from 50.06 to 53.28 wt% and a MgO content ranging from 5 to 7 wt%, indicating that these rocks are less fractionated. These rocks have a narrow range of Sr and Nd isotopic compositions ( Nd -Sm/Nd, indicating that Tateshina basaltic rocks have no crustal contamination. The wedge mantle peridotite would have experienced accumulated subduction events, including the addition of subduction components and the extraction of basalt magmas during the Tertiary period. In addition, we have accounted for the mantle motion accompanying slab subduction within the wedge mantle. Thus, we assumed that the mantle wedge before the effects of Quaternary subduction that produced the volcanic rocks of Tateshina volcano could have blended with residual mantle after the extraction of Tertiary basalt magmas with depleted MORB -source mantle (DMM). The model includes partial melting of the blended wedge mantle peridotite metasomatized by aqueous fluid and silicate melt derived from the dehydration of altered oceanic crust (AOC) and partial melting of oceanic sediments, respectively. The trace element and Sr isotope compositions of the basaltic rocks of Tateshina volcano can be reproduced by about 10% melting of the calculated wedge mantle peridotite modified by the addition of 0.8% -1.0% silicate melt from oceanic sediments and 0.2% -0.8% aqueous fluids from the AOC, respectively.

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“…To the left of La, the Malurnalu source falls below either mixture, except for Nb and Ta, which fall above. Sediment melting is thought to be common beneath arc volcanoes (Elliot et al, 1997;Hoogewerff et al, 1997;Plank and Langmuir, 1998; and, if it occurred before mixing with the mantle, could potentially account for the excess abundance of Rb, Ba, Th, U and K, but will not be able to explain the low Nb and Ta , unless a minor phase such as rutile (with high Nb and Ta compatibility; e.g. Rudnick et al, 2000) is present in the sediment during melting.…”

Section: Test For a Sediment Source Of Enrichmentmentioning

confidence: 99%

Geochemical characterization of endmember mantle components

Workman¹

2005

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U-series, SrNdPb isotope and trace-element systematics across an active island arc-continent collision zone: Implications for element transfer at the slab-wedge interface

Cited by 106 publications

References 60 publications

Oxygen isotope systematics of the Banda Arc: low δ18O despite involvement of subducted continental material in magma genesis

Oxygen isotope systematics of the Banda Arc: low δ18O despite involvement of subducted continental material in magma genesis

Effect of subduction components on production of basalts from Tateshina volcano, central Japan: geochemical calculation of dehydration of subducting oceanic crust and partial melting of overlying sediments, and subsequent fluid-mantle interaction

Geochemical characterization of endmember mantle components

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