阿尔泰多拉纳萨依金矿床初探

新疆多拉纳萨依金矿床位于阿尔泰克兰海西褶皱带玛尔卡库里大断裂的西南侧,西与苏联矿区阿尔泰之列宁诺戈尔斯克—孜里亚诺夫斯克构造成矿亚带相接。地层为中泥盆统托克萨雷组浅变质岩,大致呈南北走向的长条状分布在三个斜长花岗岩侵入体之间,并有许多钠长斑岩岩脉穿插。主要构造线方向为北北东,向西倾斜。金矿体赋存在沿断裂带侵入于灰岩中的石英钠长岩(或钠长石化斜长花岗岩)中。蚀变围岩主要为千糜岩化、白云母化的石英钠长岩。石英脉中金的品位虽然较高,但工业储量主要赋存于蚀变围岩中。自然金主要以显微和次显微状独立矿物被包裹于黄铁矿等矿物中,成色很高(932—967),其中的少量元素为银、汞和铋。为与斜长花岗岩有关的岩浆期后高—中温热液充填—交代矿床。

PRELIMINARY STUDY OF DORANASAI GOLD DEPOSIT,HABAHE, ALTAI

Doranasai gold deposit is situated in the westsouthern flank of Mar-kakol deep fault in Kran Hercynian orogenic zone connected westwards with Leninogorsk-Zyriapovsk tectonic-metallogenic subzone of Rudnoy Altai, USSR.Strata exposed in the mine are constituted by Middle Devonian quar-tz-sericite-chlorite schist and albite-chlorite-quartz sandstone with intercalation of limestone located among 3 plagioclase granite intrusives in form of a slender belt spreading in S-N direction.There are apophyses of plagioclase granite and some dikes of albito-phyre(diorite porphyrite) in the mine. The main structural line is NNE, all the intrusives and intruding in them gold-bearing quartz veins, the strata and their foliation exhibit the same occurence and dip in the west.There is an only economical ore body in the mine. It locates along fault in albitized plagioclase granite intruding in limestone or in contact zone between limestone and chlorite schists and stretches 1400m in lenth with width 2.5-16m and average gold 6.62 g/T. Quartz veins spread sporadically in the ore body. Thickniss of the veins variates greatly and commonly in interval of 5-10cm. They represent intermittently as beans. along strike and dip. There are 2 types of ores, namely, quartz veins and mylonitized altered country rocks. The gold grade in quartz veins is higher than in country rocks, but workable researves represent mainly in altered rocks.Gold is included in pyrite and other minerals as independent mineral with reletive purity of 932-967 and belong to native gold in which minor elements are Ag, Hg and Bi.