新疆托克逊县忠宝钨矿忠宝岩体岩石化学特征

Petrochemical Characteristics of Zhongbao Rock from the Zhongbao Tungsten Deposit in Tuokexun,Xinjiang Province

忠宝岩体地处新疆中天山南缘之阿特乌里干山南坡,南邻库米什坳陷,该地段在早古生代晚期—早泥盆世存在一次大规模陆缘弧花岗岩的侵入活动,忠宝岩体便是本次花岗岩侵入活动的产物。忠宝岩体主要岩性为二长花岗岩、钾长花岗岩、正长岩等,与W成矿关系密切的岩体SiO2含量65.22%～73.95%,Na2O+K2O总量在7.98%～11.2%之间,ω(K2O)/ω(Na2O)=1.29～1.69,里特曼指数σ=2.09～2.40,CIPW刚玉介于1.71%～3.12%之间,铝饱和系数A/CNK>1.11,属于过铝质、钙碱性花岗岩系列,为后造山花岗岩类,具S型花岗岩特征。

The Zhongbao rock is located in southern slope of the Arturigan Mountain of the southern Middle Tianshan of Xinjiang, the south Kumux depression, there are a large-scale continental margin arc granite intrusive activities from late Early Paleozoic to Early Devonian. Zhongbao rock is the product of the granite intrusive activities. Zhongbao lithology are monzogranite and K-feldspar granite, syenite, and W mineralization close to the rock Si02 65.22% -73.95% ,Na2O ＋ K2O content of 7.98% - 11.2% granitoids ＇ content of ω （ K2O） / to （ Na2O） = 1.29 ~ 1.69, Rittmann index = 2.09 ~ 2.40, CIPW corundum between 1.71% ~ 3.12%, aluminum saturation coefficient between A / CNK 〉 1.11, belonging to aluminum quality, ealc-alkaline granite series, with the S-type granites.