与花岗质岩浆系统有关的石英脉型钨矿和斑岩型铜矿成矿流体特征比较

文中对比了与S型花岗岩有关的石英脉型钨矿和与I型（及少数A型）花岗岩类有关的斑岩型铜矿床的成矿流体特征。它们的共同点在于成矿流体都由岩浆流体演化而来,在后期逐渐有大气降水的加入。差异性在于：（1）石英脉型钨矿成矿流体主要属于中—中高温、中—中低盐度的NaCl-H2O±CO2体系,而斑岩型铜矿属于中高-高温、高盐度的Na...

Comparison of characteristics of ore forming fluids between quartz-vein tungsten deposits and porphyry copper deposits associated with granitic rocks

We reviewed the characteristics of ore forming fluids of quartz-vein tungsten deposits associated with S type granites and porphyry copper deposits associated with I-type(some associated with A-type) granitic rocks.The two fluid systems are similar in that both of them are derived from magmatic evolution,with involvement of meteoric water in the late stage.On the other hand,they are different in the following aspects:(1) the ore forming fluids of quartz-vein tungsten deposits belong to the H2O-NaCl±CO2 system with moderate-high temperature and moderate-low salinity,whereas those associated with porphyry copper deposits belong to the H2O-NaCl-KCl±CO2 system with high temperature and high salinity;(2) boiling and phase-separation are common in porphyry copper deposits and may have played important roles for the transport and deposition of Cu,but are uncommon in quartz-vein tungsten deposits,in which fluid mixing may have played a more important role;(3) W is more associated with O and Na in fluid systems while Cu is with Cl and S,so the formation and the type of deposits depend in part on availability of these elements in the fluids.