The present study has been carried out to determine the chromian spinel and platinum group elements(PGEs)geochemistry of podiform chromitites of Dargai Complex which provides significant information regarding the mant...The present study has been carried out to determine the chromian spinel and platinum group elements(PGEs)geochemistry of podiform chromitites of Dargai Complex which provides significant information regarding the mantlecrust transition zone(MTZ)to mantle section during the emplacement and genesis of ophiolitic complexes.The mineral chemistry and platinum group elements(PGEs)were analysed using the Electron Probe Micro Analyzer(EPMA)and inductively-coupled plasma mass spectrometer(ICP-MS).Chromian spinels in the high-Cr chromitites(Cr#>60),harzburgite and mantle dunites have much higher Cr#values in the range of 78.4 to 81.9,72.2 to 77.5 and 79.8 to 82.6,respectively.However,the chromian spinels in the high-Al chromitites(Cr#<60)and MTZ dunites have much lower Cr#values in the range of 47.5 to 52.9 and 46.7 to 49.4,respectively.Based on behaviours of PGEs,the chemical differences are reflected in these two types of chromitites.展开更多
基金supported by a grant from the National Natural Science Foundation of China(No.41325007)State Key Laboratory of Geological Processes and Mineral Resources(MSFGPMR03)during the PhD studies of the first author in the China University of Geosciences,Wuhan,China.
文摘The present study has been carried out to determine the chromian spinel and platinum group elements(PGEs)geochemistry of podiform chromitites of Dargai Complex which provides significant information regarding the mantlecrust transition zone(MTZ)to mantle section during the emplacement and genesis of ophiolitic complexes.The mineral chemistry and platinum group elements(PGEs)were analysed using the Electron Probe Micro Analyzer(EPMA)and inductively-coupled plasma mass spectrometer(ICP-MS).Chromian spinels in the high-Cr chromitites(Cr#>60),harzburgite and mantle dunites have much higher Cr#values in the range of 78.4 to 81.9,72.2 to 77.5 and 79.8 to 82.6,respectively.However,the chromian spinels in the high-Al chromitites(Cr#<60)and MTZ dunites have much lower Cr#values in the range of 47.5 to 52.9 and 46.7 to 49.4,respectively.Based on behaviours of PGEs,the chemical differences are reflected in these two types of chromitites.
