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A Simple and Fast Separation Method of Fe Employing Extraction Resin for Isotope Ratio Determination by Multicollector ICP-MS

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International Journal of Analytical Mass Spectrometry and Chromatography 2013年第2期1卷 95-102页

作者： Akio Makishima the pheasant memorial laboratory for geochemistry and cosmochemistry (PML) Institute for Study of the Earth’s Interior Okayama University Misasa Tottori Japan

A new, simple and fast separation method for Fe using an extraction chromatographic resin, Aliquat 336 (commercially available as TEVA resin) has been developed. A one milliliter column containing 0.33 mL TEVA resin on 0.67 mL CG-71C was *** was adsorbed with 6mol·L-1 HCl + H2O2 on TEVA resin, and recovered with 2 mol·L-1HNO3. The recovery yield and total blank were 93.5 ± 6.5% and 6 ng, respectively. Theseparation method is simple, and takes < 2 hours. For evaluation of the Fe separation, Fe isotope ratios were measured by a double-spike method employing multicollector inductively coupled plasma source mass spectrometry (MC-ICP-MS) with repeatability of 0.06‰ (SD) for the standard solution and ~0.05‰ for the silicate samples. Therefore, the column chemistry developed in this study is a viable option for Fe isotope ratio measurement by MC-ICP-MS.

关键词： Fe Separation Fe Isotope Ratio Multicollector Inductively Coupled Plasma Source Mass Spectrometry

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Transformation of Subcontinental Lithospheric Mantle through Peridotite-Melt Reaction:Evidence from a Highly Fertile Mantle Xenolith from the North China Craton

Transformation of Subcontinental Lithospheric Mantle through...

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中国科学院地质与地球物理研究所2007学术年会

作者： EIZO NAKAMURA KATSURA KOBAYASHI the pheasant memorial laboratory for geochemistry and cosmochemistry Institute for Study of the Earth’s Interior Okayama University at MisasaTottori 682-0193Japan

A highly fertile mantle xenolith entrained in the Upper Cretaceous Daxizhuang basalt,Shandong Province,China provides petrological evidence for reaction between basaltic melt and refractory peridotite in Mesozoic lithospheric mantle beneath the eastern North China *** xenolith is zoned with a Iherzolite core,a sheared wehriite mande,and a reaclant *** Iherzolite has a medium-grained granular texture and contains olivine,orthopyroxene,clinopyroxene,and spinel with low Mg# values(≤87).This is the lowest value observed globally in mantle xenoliths entrained in both kimberlites and basalts from old cratons,but is close to low-Mg# spinel lherzolites entrained in adjacent region of the eastern North China *** wehriite mantle shows clear orientation and foliation of constituent olivine and *** reactant rim displays a symplectite texture of fine-grained olivine,clinopyroxene,and spinel,and is characterized by LREE-enriched *** is lacking from the sheared mantle and reactant *** zoning and systematic core-rim variations in major and trace elements of the constituent minerals demonstrate the occurrence of the refertilization through the melt-peridotite reaction in the *** reaction may have produced the low-Mg# peridotite from a high-Mg# protolith and could be an important mechanism for the change of the subcontinental lithospheric mantle from a Paleozoic refractory mantle to a Late Mesozoic fertile mantle.

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Lithium isotopic systematics of peridotite xenoliths from Hannuoba,North China Craton:Implications for melt-rock interaction in the considerably thinned lithospheric mantle

Lithium isotopic systematics of peridotite xenoliths from Ha...

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中国科学院地质与地球物理研究所2007学术年会

作者： Eizo Nakamura Takuya Moriguti Katsura Kobayashi the pheasant memorial laboratory for geochemistry and cosmochemistry Institute for Study of the Earth’s Interior Okayama University at MisasaTottori-ken 682-0193Japan

Li concentrations and isotopic compositions of coexisting minerals(ol,opx,and cpx) from peridotite xenoliths entrained in the Hannuoba Tertiary basalts,North China *** insight into Li isotopic fractionation between mantle minerals during melt-rock interaction in the considerably thinned lithospheric *** analyses of mineral separates show significant enrichment of Li in cpx(2.4-3.6 ppm) relative io olivine(1.2-1.8 ppm),indicating that these peridotites have been affected by mantle metasomatism with mafic silicate *** olivine separates(δLi～+3.3‰to +6.4‰) are isotopically heavier than coexisting pyroxenes(δLi～-3.3‰to -8.2‰in cpx,and -4.0‰to -6.7‰in opx).Such large variation suggests Li elemental and isotopic *** conclusion is supported by results from in situ SIMS analyses of mineral grains where significant Li elemental and isotopic zonations *** olivine and opx have lower Li concentrations and heavier Li isotopes in the rims than in the *** reverse correlation ofδLi with Li concentrations indicates diffusive fractionation of Li ***,the zoning patterns in coexisting cpx show isotopically heavier rims with higher Li *** positive correlation betweenδLi and Li concentrations suggests a melt mixing *** attribute Li concentration and isotope zonation in minerals to the effects of two-stage diffusive fractionation coupled with melt-rock interaction. The earliest melts may have been derived from the subducted oceanic slab with lowδLi values produced by isotopic fractionation during the dehydration of the seawater-altered *** at later stages were derived from the asthenosphere and interacted with the peridotites,producing the Li elemental and isotopic zoning in mineral *** data thus provide evidence for multiple-stage peridotite-melt interaction in the lithospheric mantle beneath the northern North China Craton.

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Multistage melt/fluid-peridotite interactions in the refertilized lithospheric mantle beneath the North China Craton:constraints from the Li-Sr-Nd isotopic disequilibrium between minerals of peridotite xenoliths

Multistage melt/fluid-peridotite interactions in the referti...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Eizo Nakamura the pheasant memorial laboratory for geochemistry and cosmochemistry Institute for Study of the Earth’s InteriorOkayama University at MisasaTottori-ken 682-0193Japan

Elemental and Li-Sr-Nd isotopic data of minerals in spinel peridotites hosted by Cenozoic basalts allow us to refine the existing models for Li isotopic fractionation in mantle peridotites and constrain the melt/fluid-peridotite interaction in the lithospheric mantle beneath the North China *** elevated Li concentrations in cpx (up to 24 ppm) relative to coexisting opx and olivine(<4 ppm) indicate that the peridotites experienced metasomatism by mafic silicate melts and/or *** mineralδLi vary greatly,with olivine(+0.7 to +5.4‰) being isotopically heavier than coexisting opx(-4.4 to -25.9%o) and cpx (-3.3 to - 21.4‰) in most ***δLi in pyroxenes are considerably lower than the normal mantle values and show negative correlation with their Li abundances,likely due to recent Li ingress attended by diffusive fractionation of Li *** exceptional samples have olivine S Li of -3.0 and -7.9‰,indicating the existence of lowδLi domains in the mantle,which could be transient and generated by meter-scale diffusion of Li during melt/fluid-peridotite *** Nd/Nd(0.5123-0.5139) and Sr/Sr(0.7018-0.7062) in the pyroxenes also show a large variation,in which the cpx are apparently lower in Sr/Sr and slightly higher in Nd/Nd than coexisting opx,implying an intermineral Sr-Nd isotopic disequilibrium. This is observed more apparently in peridotites having low Sr/Sr and high Nd/Nd ratios than in those with high Sr/Sr and low Nd/Nd,suggesting that a relatively recent interaction existed between an ancient me-tasomatized lithospheric mantle and asthenospheric melt, which transformed the refractory peridotites with highly radiogenic Sr and unradiogenic Nd isotopic compositions to the fertile lherzolites with unradiogenic Sr and radiogenic Nd isotopic ***,we argue that the lithospheric mantle represented by the peridotites has been het-erogeneously refertilized by multistage melt/fluid-peridotite interactions.

关键词： Peridotite xenoliths Lithium isotope Melt/fluid-peridotite interaction Lithospheric mantle North China Craton

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A Hybrid Statistical-Dynamical Downscaling of Air Temperature over Scandinavia Using the WRF Model

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Advances in Atmospheric Sciences 2020年第1期37卷 57-74页

作者： Jianfeng WANG Ricardo M.FONSECA Kendall RUTLEDGE Javier MARTÍN-TORRES Jun YU Department of Mathematics and Mathematical Statistics UmeåUniversitySE 90187UmeåSweden Group of Atmospheric Science Division of Space TechnologyDepartment of Computer ScienceElectrical and Space EngineeringLuleåUniversity of TechnologySE 97187 LuleåSweden Novia University of Applied Sciences PO BOX 6FI-65201 VaasaFinland Instituto Andaluz de Ciencias de la Tierra 18100 GranadaSpain the pheasant memorial laboratory for geochemistry and cosmochemistry Institute for Planetary MaterialsOkayama University at MisasaTottori 682-0193Japan

An accurate simulation of air temperature at local scales is crucial for the vast majority of weather and climate *** this work,a hybrid statistical–dynamical downscaling method and a high-resolution dynamical-only downscaling method are applied to daily mean,minimum and maximum air temperatures to investigate the quality of localscale estimates produced by *** two downscaling approaches are evaluated using station observation data obtained from the Finnish Meteorological Institute over a near-coastal region of western *** dynamical downscaling is performed with the Weather Research and Forecasting(WRF)model,and the statistical downscaling method implemented is the Cumulative Distribution Function-transform(CDF-t).The CDF-t is trained using 20 years of WRF-downscaled Climate Forecast System Reanalysis data over the region at a 3-km spatial resolution for the central month of each *** performance of the two methods is assessed qualitatively,by inspection of quantile-quantile plots,and quantitatively,through the Cramer-von Mises,mean absolute error,and root-mean-square error *** hybrid approach is found to provide significantly more skillful forecasts of the observed daily mean and maximum air temperatures than those of the dynamical-only downscaling(for all seasons).The hybrid method proves to be less computationally expensive,and also to give more skillful temperature forecasts(at least for the Finnish near-coastal region).

关键词： WRF air temperature Cumulative Distribution Function-transform hybrid statistical–dynamical downscaling,model evaluation Scandinavian Peninsula

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