东昆仑白金沟金矿床石英的成矿作用显示

Reflections of Gold Mineralization from Quartz in the Baijingou Gold Deposit,Eastern Kunlun Mountains

１地质特征白金沟金矿地处东昆仑的开荒北地区，位于昆南断裂与阿拉克湖—托索湖断裂交汇处，是东昆仑较为典型的石英脉型金矿和找矿前景颇佳的矿种。区内断裂构造发育，并且多期次活动，以致矿区岩石破碎强烈，影响较大的断裂破碎带有三条，以压性为主，产状分别为２１０...

Baijingou quartz vein gold deposit is located in Kaihuangbei area of the eastern Kunlun Mountains.This paper shows that the geochemical characteristics of the quartz in the gold deposit are closely related to gold mineralization.By comparison with the quartz formed during no mineralizing stages,the metallogenic quartz is of lower SiO 2 contents,less negative Ce anomaly,higher contents of Cr 2O 3,FeO,Au and AgO(as well as Al 2O 3,K 2O,Na 2O,Bi 2O 5,Cu and Zn),higher REE fractionation,and positive Eu anomaly.The intensity of Eu is anomaly positively proportional to the mineralization.Admixture elements have no effect on the unit cell parameters which does not correlate with the gold mineralization.However,the unit cell parameter is closely related to the temperature and pressure conditions,that is,the less the unit cell parameter the higher the c 0/ a 0,temperature and pressure.There are obvious differences in the unit cell parameters of the quartz from different stages.The unit cell parameter of the quartz in No.22 ore vein is higher than that in No.25 ore vein.The former was formed at earlier stage at a higher temperature and was denuded more slightly than the later.