A new type of REE tetrad effect,a composite M-and W-type,was recognized in the K-feldsparthized and silicificated Shuiquangou alkaline syenites,Dongping,Hebei Province.Different analytical methods such as ICP-MS and i...A new type of REE tetrad effect,a composite M-and W-type,was recognized in the K-feldsparthized and silicificated Shuiquangou alkaline syenites,Dongping,Hebei Province.Different analytical methods such as ICP-MS and isotopic dilution thermal ion mass spectrometer were exploited to verify the REE concentrations of the samples in three laboratories in China,France and Korea.The results are reliable and consistent within errors.In situ quantitative analysis of REE concentrations of individual zircons and apatites extracted from the very same sample has shown that fractional crystallization of magma and the superimposed hydrothermal alteration might have taken place in at least two-stage hydrothermal activities to generate the composite M-and W-type REE tetrad effect.The coexisting melt and aqueous phases,the superimposed alteration by volatile(Cl,CO2) -and Si,K, Al-enriched high temperature hydrothermal fluids might be the important facts for this new MW-type of REE tetrad effect.In addition,the peculiar MW-type tetrad effect might be an indicator for Au mineralization of reworked plutons.展开更多
采用化学共沉与高温助熔相结合的工艺制备了 W 型六角晶系铁氧体—Ba(Zn_(1-x)CO_x)_2Fe_(16)O_(27)。对不同烧结温度,其物相组成的变化,比饱和磁化强度σ、磁晶各向异性场 H_A~θ随 Co^(2+)取代值 x 的变化以及晶粒形貌进行了测试和分...采用化学共沉与高温助熔相结合的工艺制备了 W 型六角晶系铁氧体—Ba(Zn_(1-x)CO_x)_2Fe_(16)O_(27)。对不同烧结温度,其物相组成的变化,比饱和磁化强度σ、磁晶各向异性场 H_A~θ随 Co^(2+)取代值 x 的变化以及晶粒形貌进行了测试和分析。结果表明:在烧结温度1250℃,保温0.5h 的条件下,测得纯相 W 型材料;当 x=0.45左右时,Ba(Zn_(1-x)Co_x)_2Fe_(16)O_(27)的磁矩从优方向由单轴过渡到平面。展开更多
基金supported by the National Natural Science Foundation of China(40773018)the National Basic Research Program of China(2006CB403504)This is contribution No.IS-1124 from GIGCAS
文摘A new type of REE tetrad effect,a composite M-and W-type,was recognized in the K-feldsparthized and silicificated Shuiquangou alkaline syenites,Dongping,Hebei Province.Different analytical methods such as ICP-MS and isotopic dilution thermal ion mass spectrometer were exploited to verify the REE concentrations of the samples in three laboratories in China,France and Korea.The results are reliable and consistent within errors.In situ quantitative analysis of REE concentrations of individual zircons and apatites extracted from the very same sample has shown that fractional crystallization of magma and the superimposed hydrothermal alteration might have taken place in at least two-stage hydrothermal activities to generate the composite M-and W-type REE tetrad effect.The coexisting melt and aqueous phases,the superimposed alteration by volatile(Cl,CO2) -and Si,K, Al-enriched high temperature hydrothermal fluids might be the important facts for this new MW-type of REE tetrad effect.In addition,the peculiar MW-type tetrad effect might be an indicator for Au mineralization of reworked plutons.
文摘采用化学共沉与高温助熔相结合的工艺制备了 W 型六角晶系铁氧体—Ba(Zn_(1-x)CO_x)_2Fe_(16)O_(27)。对不同烧结温度,其物相组成的变化,比饱和磁化强度σ、磁晶各向异性场 H_A~θ随 Co^(2+)取代值 x 的变化以及晶粒形貌进行了测试和分析。结果表明:在烧结温度1250℃,保温0.5h 的条件下,测得纯相 W 型材料;当 x=0.45左右时,Ba(Zn_(1-x)Co_x)_2Fe_(16)O_(27)的磁矩从优方向由单轴过渡到平面。
