《Table 2 Major and trace element compositions of the Yangbishan gneissic granite》

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《Metallogenic Mechanism and Tectonic Setting of Tungsten Mineralization in the Yangbishan Deposit in Northeastern China》

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Note:A/CNK=molar ratio of Al2O3/（Ca O+Na2O+K2O）；A/NK=molar of Al2O3/（Na2O+K2O）；δ=[w（K2O+Na2O）2]/[w（Si O2）–43]

Major element compositions of the Yangbishan gneissic granite are listed in Table 2.The gneissic granite is characterized by high silica（Si O2=71.28–72.84 wt%），and rich in alkali（Na2O+K2O=7.57–8.31 wt%）.In these samples，K2O contents are 4.58–5.10 wt%，Na2O contents are 2.64–3.25 wt%，and Na2O/K2O ratios are from 0.52 to0.67，which indicates that these samples are relatively rich in potassium.In addition，these samples are characterized by lower contents of Fe2O3T，Mg O，Mn O，Ca O，and P2O5.A/CNK is 1.12–1.25.Their Rittmann index（δ）ranges from 1.96 to 2.79.Their differentiation index（DI）ranges from 89 to 90，indicating that the gneissic granite may be derived from highly fractionated magma.In the QAP classification diagram（Fig.7a），these sample polts fall in the region of granite.In the A/NK–A/CNK diagram（Fig.7b），these sample plots fall in the region of peraluminous rock.