Constraining fluid and sediment contributions to subduction-related magmatism in Indonesia: Ijen Volcanic Complex

被引:101
作者
Handley, H. K.
Macpherson, C. G.
Davidson, J. P.
Berlo, K.
Lowry, D.
机构
[1] Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
[2] Univ Bristol, Dept Earth Sci, Bristol BS8 1RJ, Avon, England
[3] Univ London, Royal Holloway & Bedford New Coll, Dept Geol, Egham TW20 0EX, Surrey, England
基金
英国自然环境研究理事会;
关键词
differentiation; geochemistry; source components; Sr; No; Hf and O isotopes; Sunda arc;
D O I
10.1093/petrology/egm013
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Ijen Volcanic Complex (IVC) in East Fava, Indonesia is situated on thickened oceanic crust within the Quaternary volcanic front of the Sunda arc. The 20 km wide calderas complex contains around 22 post-caldera eruptive centres, positioned either around the caldera-rim (CR) or along a roughly NE SW lineament inside the caldera (IC). The CR and IC lavas exhibit separate differentiation histories. Major element and trace element modelling shows that fractionation of olivine, clinopyroxene, Fe- Ti oxide +/- plagloclase is important in the CR group, whereas plagioclase is the dominant fractionating mineral in the same assemblage for the IC group. Spatial controls on magmatic differentiation highlight important structural controls on magma storage and ascent at IVC. Mantle-like delta O-18 values, restricted ranges in Sr, Nd and Hf isotope ratios, and a lack of correlation between isotope ratios and indices of differentiation in IVC lavas are consistent with magmatic evolution through fractional crystallization. Furthermore, the small ranges in isotopic ratios throughout the complex indicate little heterogeneity in the mantle. IVC lavas possess higher Hf-176/Hf-177 and Nd-143/Nd-144 isotope ratios than other volcanoes of Java, representing the least contaminated source so far analysed and, therefore, give the best estimate yet of the pre-subduction mantle wedge isotopic composition beneath Fava. Trace element and radiogenic isotope data are consistent with a two-stage, three-component petrogenetic model for IVC, whereby an Indian-type mid-ocean ridge basalt (I-MORB) -like fertile mantle wedge is first infiltrated by a small percentage of fluid, sourced from the altered oceanic crust, prior to addition of < 1% Indian Ocean sediment dominated by pelagic material.
引用
收藏
页码:1155 / 1183
页数:29
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