白银厂铜－多金属矿床氢、氧同位素组成特征及蚀变岩氧同位素的找矿意义  

OXYGEN AND HYDROGEN ISOTOPIC COMPOSITIONS OF BAIYINCHANG COPPER-POLYMETALLIC DEPOSITS AND ORE-HUNTING IMPLICATIONS OF THE OXYGEN ISOTOPIC MEASUREMENT OF ALTERATION ROCKS

作　　者：王兴安[1] 

机构地区：[1]中国地质科学院西安地质矿产研究所

出　　处：《西北地质科学》1995年第2期59-64,共6页Northwest Geoscience

基　　金：国家"八.五"攻关专题

摘　　要：白银厂铜－多金属矿床矿石脉石英中包裹体水的氢同位素组成明显偏低（δＤ＝－７１‰─－９５‰），经计算所得的成矿热液水的氧同位素组成为－１．２６‰－＋８．７‰，其变化范围也大．这些数据结合其他地球化学数据说明，成矿热液水的介质水是经过大气降水淡化的海水，并有少量岩浆水参与了成矿作用．在折腰山露天采坑，由矿体向两侧蚀变岩δ１８Ｏ值逐渐升高，曲线图上形如“凹槽”，说明矿体附近水／岩比值最大，热波通道也在矿体附近．在矿体未出露的地表上采样（小铁山），同样也有“凹槽”现象出现，若进一步做工作，蚀变岩石氧同位素测量有望成为一种有效的找矿手段．he hydrogen isotopic compositions of inclusions in quartz from ore veins of Baiyinchang copper-polymetallic deposits are obviously low(-71‰--95‰), and the oxygen isotopic compositions calculated range widely from-1. 26 to +8. 7‰. These combined with other geochemcial data suggest that the medium water of metallogenic hydrothermal fluid is seawater which is desalinated by atmospheric waters and that a small amount of magma water was involved in mineralization. The δ18O curve of Zheyaoshan opencut mining section appears to be atrough in shape, in which the δ18O values increase from orebodies to the alteration rocks of its two sides. This indicates that the maximum water/rock ratio is nearby and that the hydrothermal conduit is near the ore bodies. Also appeared 'the trough phenomenon' on the surface where there is no outcrop of orebody. If more works have been done, the oxygen isotopic measurement of alteration rocks could become an effective means of ore-hunting.

关 键 词：氧同位素 找矿 氢同位素 铜矿床 多金属矿床 

分 类 号：P618.410.4[天文地球—矿床学] P618.204[天文地球—地质学]