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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 evolution.During this period the parece vela basin(PVB)was formed by seafloor spreading in the back-arc region of the proto-Izu-Bonin-Mariana(IBM)arc.However,until now,studies of the geological,geophysical,and tectonic evolution of the PVB have been rare.In 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 PVB.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 lherzolite.The 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 clinopyroxene.Using 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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Cleaning of Marine Sediment Samples for Large Diatom Stable Isotope Analysis

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Journal of Earth Science 2012年第2期23卷 161-172页

作者：熊志方李铁刚 Xavier Crosta Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of Sciences UMR-CNRS 5805 EPOC UniversitéBordeaux 1Avenue des Facultés

Diatom stable isotope analysis offers considerable potential in palaeoceanography, par-ticularly where carbonate material is scarce or absent. However, extracting pure diatom frustules free of external labile organic matter from marine sediments is an essential requirement for their applica-tions as paleoenvironmental proxies. Here, based largely on previous work, we developed a method in-cluding physical separation and chemical oxidation steps to concentrate and clean pure large diatoms from laminated diatom mat and diatomaceous clay sediment samples for their stable isotope analysis. Using the physical separation techniques consisting of the removal of carbonate and excess organic matter, sieving, differential settling, and heavy liquid floatation, pure diatoms can be successfully iso-lated from the sediment samples with opal concentration more than 10%. Subsequent time oxidation experiment shows that labile organic matter coating pure diatom valves can be effectively removed with 30% H2O2 at 65 ℃ for 2 h. Measurements of δ13C after every step of physical separation demonstrate that contaminants and lost diatoms can influence the original diatom stable isotope signal, highlighting the importance of a visual check for dominant diatom size in the initial sample and purity in the final sample. Although the protocol described here was only applied to diatom mats or diatom oozes con-taining large diatoms （Ethmodiscus rex）, we believe that this method can be adapted to common dia-toms of general marine sediment samples.

关键词： large diatom stable isotope physical separation chemical oxidation parece vela basin palaeoceanography.

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