Trace Elements in Chromian Spinels from Four Siberian Kimberlites
نویسندگان
چکیده
We analysed the major, minor and trace elements chemistry of forty-two Cr-spinels from four Siberian kimberlites. They showed a wide range in Mg# (Mg/(Mg + Fe2+); 0.42–0.78) Cr# (Cr/(Cr Al); 0.32–0.92) common trend increasing with decreasing Mg#. The major element classification schemes suggested that there were spinels deriving peridotitic source (Xen) crystallised kimberlitic melts (Chr). Laser-Ablation Inductively Coupled Plasma Mass Spectrometry on both groups highest abundance Mn (985–3390 ppm), Ni (531–3162 V (694–2510 ppm) Zn (475–2230 ppm). Testing effectiveness determining for Cr-spinels, we found out directly melt usually higher Mn, Ni, Sc concentrations respect to those origin. In addition, using available partitioning models, correlations between Co, Ga Xen group could be explained by subsolidus equilibration spinel, olivine clinopyroxene at 800–1000 °C, thus supporting this group. Finally, calculated composition possible equilibrium Chr group, selected set partition coefficients. Calculated abundances Cu, Zr comparable kimberlite, while was never close kimberlite composition. This simulation highlighted need new data coefficients Cr-spinel.
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ژورنال
عنوان ژورنال: Minerals
سال: 2022
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min12111439