从成矿和变形时代的不耦合现象探讨康古尔金矿的成因

Study on the Genesis of Kanggur Gold Deposit Based on the Discordance of the Metallogenic Epoch and Deformation Time

位于塔里木盆地北缘的康古尔金矿出露于秋格明塔什 黄山巨型韧性剪切带中部 ,长期以来被当作剪切带型金矿加以研究。通过初步的同位素年代学研究却发现了成矿和变形时代的不耦合现象 :康古尔金矿成矿时代在 2 90Ma左右 ,而秋格明塔什 黄山韧性剪切带剪切变形时代在 2 2 5～ 2 36Ma。如果认定康古尔金矿成矿作用发生在海西期 ,则发生于印支中 晚期的韧性剪切变形作用不仅不是康古尔金矿成矿作用的主因 ,而且对金矿的改造作用也是有限的。因此 。

The Kanggur gold deposit, located in the northern margin of Tarim plate, outcrops in the middle part of Quigemingtashi-Huangshan ductile shear zone, so it is, in the long time, considered to be the gold deposit of shear zone type. However, the preliminary study of isotope geochronology indicates that the metallogenic epoch is discordant with the deformation age. Metallogenic epoch of the Kanggur gold deposit is about 290 Ma while deformation age of the Quigemingtashi-Huangshan ductile shear zone is about 225～236 Ma.If the metallization is considered to occur in Heicynian period, ductile shear deformation occurred in the middle-late Indo-Sinian period is not the key factor of Kanggur gold deposit metallization and it is also limited on the alteration of the gold deposit. Therefore, Kanggur gold deposit is not that of shear zone type.