光谱分析、光谱测量 O433．4 2004020879 利用FFIR光谱仪进行地物光谱发射率的野外测量方法研究=Field measurement of the spectral emissivity of terrestrial surface materials with the Fourier transform infrared spectrometer[...光谱分析、光谱测量 O433．4 2004020879 利用FFIR光谱仪进行地物光谱发射率的野外测量方法研究=Field measurement of the spectral emissivity of terrestrial surface materials with the Fourier transform infrared spectrometer[刊,中]／王霞(北京理工大学信息科学技术学院光电工程系．北京(100081)),金伟其∥北京理工大学学报．—2003,23(4)．—405-407,418 为了实现利用FTIR光谱仪进行野外地物光谱发射率的测量,针对D&P公司生产的Model-101型便携式FTIR光谱仪,讨论了仪器的定标原理,给出了样品的光谱辐射计算公式。采用低发射率反射板测量环境辐射,可以方便、快捷地计算出样品的发射率,并给出了相应的修正方法。样品实测结果表明,修正后的光谱发射率曲线与标准光谱发射率曲线具有很好的一致性。图3参6(杨妹清)展开更多
Water has become an effective means to trace the mantle source of basaltic magmas recently. To investigate the source of the potassium-rich component in the Xiaogulihe ultrapotassic volcanic rocks of NE China, we meas...Water has become an effective means to trace the mantle source of basaltic magmas recently. To investigate the source of the potassium-rich component in the Xiaogulihe ultrapotassic volcanic rocks of NE China, we measured the water content of clinopyroxene （cpx） phenocrysts by Fourier transform infrared spectrometry and calculated the H2O content of the equilibrated melts according to the partition coefficients of H2O between cpx phenocrysts and basaltic melts. The estimated H2O content of the ＂primary＂ magmas is low （0.36 wt%-0.50 wt%）, within the range of mid-ocean ridge basalts and ocean island basalts, while it is obviously lower than that of backarc basin basalts and island arc basalts. The calculated H20/Ce ratio of the ＂primary＂ magmas is about 15, which might be similar to that of the dehydrated sediments （〈100）, but observably lower than that of the normal depleted mantle （DMM, H2O/Ce = 150-210）. The low water content and especially low H2O/Ce ratio of the ＂primary＂ magmas demonstrate that the K-rich component of these ultrapotassic volcanic rocks seems unlikely tooriginate from K-bearing hydrous minerals （such as phlogopite） in metasomatic subcontinental lithospheric mantle. Combined with the low 206pb/204pb ratios, moderately high 87Sr/86Sr ratios of the bulk rocks and the high δ18O values of olivine phenocrysts, we suggest that the K-rich component in the mantle source of the Xiaogulihe ultrapotassic volcanic rocks may come from ancient continental-derived sediments which dehydrated significantly during subduction （e.g., dry K-hollandite）.展开更多
文摘光谱分析、光谱测量 O433．4 2004020879 利用FFIR光谱仪进行地物光谱发射率的野外测量方法研究=Field measurement of the spectral emissivity of terrestrial surface materials with the Fourier transform infrared spectrometer[刊,中]／王霞(北京理工大学信息科学技术学院光电工程系．北京(100081)),金伟其∥北京理工大学学报．—2003,23(4)．—405-407,418 为了实现利用FTIR光谱仪进行野外地物光谱发射率的测量,针对D&P公司生产的Model-101型便携式FTIR光谱仪,讨论了仪器的定标原理,给出了样品的光谱辐射计算公式。采用低发射率反射板测量环境辐射,可以方便、快捷地计算出样品的发射率,并给出了相应的修正方法。样品实测结果表明,修正后的光谱发射率曲线与标准光谱发射率曲线具有很好的一致性。图3参6(杨妹清)
基金supported by the National Natural Science Foundation of China(41225005)the Research Fund for the Doctoral Program of Higher Education of China(RFDP20113402130001)
文摘Water has become an effective means to trace the mantle source of basaltic magmas recently. To investigate the source of the potassium-rich component in the Xiaogulihe ultrapotassic volcanic rocks of NE China, we measured the water content of clinopyroxene （cpx） phenocrysts by Fourier transform infrared spectrometry and calculated the H2O content of the equilibrated melts according to the partition coefficients of H2O between cpx phenocrysts and basaltic melts. The estimated H2O content of the ＂primary＂ magmas is low （0.36 wt%-0.50 wt%）, within the range of mid-ocean ridge basalts and ocean island basalts, while it is obviously lower than that of backarc basin basalts and island arc basalts. The calculated H20/Ce ratio of the ＂primary＂ magmas is about 15, which might be similar to that of the dehydrated sediments （〈100）, but observably lower than that of the normal depleted mantle （DMM, H2O/Ce = 150-210）. The low water content and especially low H2O/Ce ratio of the ＂primary＂ magmas demonstrate that the K-rich component of these ultrapotassic volcanic rocks seems unlikely tooriginate from K-bearing hydrous minerals （such as phlogopite） in metasomatic subcontinental lithospheric mantle. Combined with the low 206pb/204pb ratios, moderately high 87Sr/86Sr ratios of the bulk rocks and the high δ18O values of olivine phenocrysts, we suggest that the K-rich component in the mantle source of the Xiaogulihe ultrapotassic volcanic rocks may come from ancient continental-derived sediments which dehydrated significantly during subduction （e.g., dry K-hollandite）.
