Abstract
The Mariana Trough, a relatively simple intra-oceanic back-arc basin, is ideal for investigating magmatic processes and mantle-crust interaction in a subduction setting. We present new major- and trace element compositions for 31 basaltic lava and glass samples from the Mariana Trough back-arc spreading center. The studied lavas include phenocrysts of plagioclase, olivine and pyroxene. Major element compositions show that these lavas range from tholeiitic basalt to basaltic andesite, and belong to a sub-alkali tholeiitic series produced by fluid-influenced fractional crystallization of primary basaltic melts. Trace element compositions show that these lavas are transitional between typical normal mid-ocean ridge basalts (MORB) and island arc basalt (IAB), and are enriched in large ion lithophile elements (LILEs) and light rare earth elements (LREEs). Trace element ratios, e.g., Ba/Th, Pb/Ce, Th/Nd, La/Sm, Th/Nb, Ba/Nb and Th/Nb, indicate that the mantle from which these lavas were derived underwent modification resulting from the addition of multiple subduction components. Some typical trace element ratios (e.g., Ba/Nb- total subduction component, Ba/Th- shallow subduction, and Th/Nb-deep subduction component) from our new data and the literature suggest that a latitudinal variation exists in addition to subduction components, and indicates a more complex and heterogeneous distribution of subduction components in the Mariana back-arc region. We suggest that, (1) compared to back-arc locations at 18° N and 15.5° N, lavas from back-arc locations at 17° N indicate higher levels of modification by hydrous fluid released from the subducted slab, and (2) compared to back-arc locations at 17° N and 15.5° N, petrogenesis of lavas from back-arc locations at 18° N indicates a greater influence of sediment melt.
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Acknowledgements
Thanks are due to Philip Leat and an anonymous expert for their constructive reviews that helped to improve the manuscript. Major oxides and trace elements were determined by X-rayfluorescence (XRF) spectroscopy at the Testing Center of Shandong Bureau, China Metallurgical Geology Bureau. This work was supported by the National Programme on Global Change and Air-Sea Interaction (no. GASI-GEOGE-02); Basic Scientific Fund for National Public Research Institutes of China (2016S01); National Natural Science Foundation of China (Grants nos. 41776070, 41276003, 41322036); Taishan Scholarship from Shandong Province.; and AoShan Talents Program Supported by Qingdao National Laboratory for Marine Science and Technology (no. 2015ASTP-ES16). IM acknowledges support from the Australian Research Council.
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Yan, Q., Zhang, P., Metcalfe, I. et al. Geochemistry of axial lavas from the mid- and southern Mariana Trough, and implications for back-arc magmatic processes. Miner Petrol 113, 803–820 (2019). https://doi.org/10.1007/s00710-019-00683-x
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DOI: https://doi.org/10.1007/s00710-019-00683-x