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Across-arc geochemical variation of Quaternary lavas in West Java, Indonesia: Mass-balance elucidation using arc basalt simulator model
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In this article, the authors investigated the geochemistry of 207 Quaternary lavas from six centers across the Sunda arc and found that the most compatible element abundances increase from the volcanic front to the rear-arc in response to a change from low-K to high-K suites Nd-Sr isotope compositions of the basalts scatter between mid-ocean ridge basalt (MORB) source mantle and Indian Ocean sediment (SED) compositions, with volcanic front low-k basalts having more radiogenic Nd than the reararc basaltsAbstract:
The Sunda Arc of Indonesia developed along the convergent margin between the Eurasian and the Australian Plates More than 100 Quaternary volcanic centers occur along the arc The West Java Arc is a segment of the Sunda Arc in which more than 10 volcanic centers are located, corresponding to the 120 to 200 km depth contours of the Wadati–Benioff zone The geochemistry of 207 Quaternary lavas from six centers across the arc was investigated The lavas range from basalt to dacite Incompatible element abundances increase from the volcanic front to the rear-arc in response to a change from low-K to high-K suites Nd–Sr isotope compositions of the basalts scatter between mid-ocean ridge basalt (MORB) source mantle and Indian Ocean sediment (SED) compositions, with volcanic front low-K basalts having more radiogenic Nd than the rear-arc basalts It is suggested that mixing between slab-derived fluids mainly from the SED and melt from MORB source mantle played a significant role in determining the geochemistry of the West Java basalts Incompatible element patterns in primitive mantle normalized multi-element plots are almost identical across the arc, except for greater inclination and weaker positive Sr spikes in the rear-arc basalts This suggests a lower degree of partial melting in the rear-arc mantle, accompanied by change in SED fluid composition between the volcanic front and the rear-arc The latter is confirmed by fluid-fluxed melting model calculations using multiple trace elements and Nd and Sr isotopes All the West Java Arc lavas require deficit of Sr from the slab SED This may occur due to selective breakdown of Sr-rich hydrous silicate minerals, such as zoisite, at shallower depths before the SED component reaches the depth of dehydration effective for magma genesis The rear-arc basalts need further Sr deficits along with lesser fluid These features are commonly observed in many arc basalts, and are likely attributable to the same mechanismread more
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Arc Basalt Simulator version 2, a simulation for slab dehydration and fluid‐fluxed mantle melting for arc basalts: Modeling scheme and application
Jun-Ichi Kimura,Bradley R. Hacker,Peter E. van Keken,Hiroshi Kawabata,Takeyoshi Yoshida,Robert J. Stern +5 more
TL;DR: The Arc Basalt Simulator (ABS2) as mentioned in this paper uses an Excel® spreadsheet-based calculator to predict the partitioning of incompatible element and Sr-Nd-Pb isotopic composition in a slab-derived fluid and in arc basalt magma generated by an open system fluid-fluxed melting of mantle wedge peridotite.
Journal ArticleDOI
Intraplate magmatism related to deceleration of upwelling asthenospheric mantle: Implications from the Changbaishan shield basalts, northeast China
Takeshi Kuritani,Jun-Ichi Kimura,Tsuyoshi Miyamoto,Haiquan Wei,Taketo Shimano,Fukashi Maeno,Xu Jin,Hiromitsu Taniguchi +7 more
TL;DR: In this paper, the authors investigated the mechanisms of continental intraplate magmatism with respect to Cenozoic basaltic shield lavas from the Changbaishan area, northeast China, using a comprehensive data set of major and trace elements, Sr, Nd, and Pb isotopic compositions, and K-Ar ages.
Journal ArticleDOI
Statistical evaluation of tectonomagmatic discrimination diagrams for granitic rocks and proposal of new discriminant-function-based multi-dimensional diagrams for acid rocks
TL;DR: In this article, the authors proposed a set of five discriminant function-based multi-dimensional diagrams for acid magmas from four tectonic settings (island arc, continental arcs, continental rift, and collision) using an extensive database.
Journal ArticleDOI
Pulsatile ocular blood flow changes after panretinal photocoagulation treatment in patients with proliferative diabetic retinopathy.
TL;DR: 3 sets of discrimination diagrams obtained from the correct statistical methodology of loge-ratio transformation and linear discriminant analysis are presented, indicating that these diagrams are robust against postemplacement compositional changes caused by analytical errors, element mobility, Fe-oxidation, alteration, and petrogenetic processes.
Modeling chemical geodynamics of subduction zones using the Arc Basalt Simulator version 5
TL;DR: ABS5 as discussed by the authors is a forward geochemical and petrological model that can be used to examine the element mass balance in primary arc magmas including the source and nature of slab materials and flux melting of the mantle-wedge peridotite.
References
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Chemical and isotopic systematics of oceanic basalt : implications for mantle composition and processes
TL;DR: In this article, trace-element data for mid-ocean ridge basalts and ocean island basalts are used to formulate chemical systematics for oceanic basalts, interpreted in terms of partial-melting conditions, variations in residual mineralogy, involvement of subducted sediment, recycling of oceanic lithosphere and processes within the low velocity zone.
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Chemical and isotopic systematics of oceanic basalts. Implications for Mantle Composition and Processes
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Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey
TL;DR: In this paper, the Pontic eocene volcanic rocks cropping out in the Kastamonu area, Pontic chain of Northern Turkey were analyzed and the SiO2% versus K2O% relationship showed that the analyzed samples belong to two major groups: the basaltic andesitic and the andesite ones.
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The chemical composition of subducting sediment and its consequences for the crust and mantle
Terry Plank,Charles H. Langmuir +1 more
TL;DR: This article evaluated subducting sediments on a global basis in order to better define their chemical systematics and to determine both regional and global average compositions, and then used these compositions to assess the importance of sediments to arc volcanism and crust-mantle recycling, and to re-evaluate the chemical composition of the continental crust.
Journal ArticleDOI
Major and trace element composition of the depleted MORB mantle (DMM)
R. Workman,Stanley R. Hart +1 more
TL;DR: Asimow et al. as mentioned in this paper derived an estimate for the chemical composition of the depleted MORB mantle (DMM), the source reservoir to mid-ocean ridge basalts (MORBs), which represents at least 30% the mass of the whole silicate Earth.
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