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Source Lithology and Magmatic Processes Recorded in the Mineral of basalts from the Parece Vela basin

Acta Geologica Sinica(English Edition) 2022年第6期96卷 1991-2006页

作者： YUAN Long YAN Quanshu College of Earth Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong 266061China Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdaoShandong 266061China

Since the Early Cenozoic,the Philippine Sea Plate(PSP)has undergone a complex tectonic *** this period the Parece Vela basin(PVB)was formed by seafloor spreading in the back-arc region of the proto-Izu-Bonin-Mariana(IBM)***,until now,studies of the geological,geophysical,and tectonic evolution of the PVB have been *** this study,we obtained in situ trace element and major element compositions of minerals in basalts collected from two sites in the southern part of the *** results reveal that the basalts from site CJ09-63 were likely formed via~10%partial melting of spinel-garnet lherzolite,while the basalts from site CJ09-64 were likely formed via 15%–25%partial melting of garnet *** order of mineral crystallization for the basalts from site CJ09-64 was olivine,spinel,clinopyroxene,and plagioclase,while the plagioclase in the basalts from site CJ09-63 crystallized earlier than the *** a plagioclase-liquid hygrometer and an olivine-liquid oxybarometer,we determined that the basalts in this study have high H2O contents and oxygen fugacities,suggesting that the magma source of the Parece Vela basalts was affected by subduction components,which is consistent with the trace element composition of whole rock.

关键词： source lithology magmatic processes subduction components back-arc basin basalts Parece Vela basin

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