Abstract
There has been much recent interest in the origin of intermediate lava and several hypotheses are: 1) direct melting of the mantle under water-saturated conditions, 2) partial melting of altered crust, 3) fractional crystallization of parent magma, and 4) magma mixing of mafic magmas with dacitic/rhyolitic magmas. Volcanic rocks series ranging from basaltic andesite to dacite (SiO2 ranges from 53.8 to 63.0 wt.%) from the eastern Manus Basin were detected for major and trace element compositions to understand their origin. Low H2O contents, positive correlations of La-SiO2 and Yb-SiO2, oxygen isotope data and the indistinct change of trace element concentrations in oscillatory zoning of plagioclase phenocrysts rule out the models in which silicic lava results from direct melting of hydrous mantle, partial melting of altered oceanic crust or gabbros, and magma mixing, respectively. Besides, the geochemical data of whole rock and melt inclusions indicate that fractional crystallization plays a dominant role in generating the intermediate lava with subduction features.
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Acknowledgements
We would like to express our gratitude to the crew of ‘KX08-973’ cruise for their paramount hardworking in obtaining the samples. Institute of Oceanology, Chinese Academy of Sciences, Institute of Geology and Geophysics, Chinese Academy of Sciences, as well as Institute of Mineral Resources, Chinese Academy of Geological Sciences are greatly acknowledged for high quality sample analyses.
This work was supported by the National Key Basic Research Program of China (No. 2013CB429700), the National Natural Science Foundation of China (Nos. 41325021, 41306053, 40476044), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA11030302), the Special Fund for the Taishan Scholar Program of Shandong Province (No. ts201511061), the AoShan Talents Program Supported by Qingdao National Laboratory for Marine Science and Technology (No. 2015ASTP-0S17), the Innovative Talent Promotion Program (No. 2012RA2191), the Science and Technology Development Program of Shandong Province (No. 2013GRC31502), the Scientific and Technological Innovation Project Financially Supported by Qingdao National Laboratory for Marine Science and Technology (No. 2015ASKJ03), the National High Level Talent Special Support Program, the CAS/SAFEA International Partnership Program for Creative Research Teams, and the Qingdao Collaborative Innovation Center of Marine Science and Technology.
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Ma, Y., Zeng, Z., Chen, S. et al. Origin of the volcanic rocks erupted in the eastern Manus Basin: Basaltic andesite-andesite-dacite associations. J. Ocean Univ. China 16, 389–402 (2017). https://doi.org/10.1007/s11802-017-3142-x
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DOI: https://doi.org/10.1007/s11802-017-3142-x