福建紫金山铜金矿床氢氧同位素组成特征及与成矿关系的研究

Characteristics of Hydrogen and Oxygen Isotopic Composition of the Zijinshan Copper-Gold Deposit and the Relation to the Ore-Forming Process

福建紫金山铜金矿床氢氧同位素研究结果表明，蚀变矿化作用过程中（由早期至晚期）大气降水渗入量增加，并呈阶段性演化，成矿W／R比值较小（0．05～0．2）。蚀变岩石（3线）氧同位素剖面变化表明，上部金矿体与高δ18O值（12‰～15‰）对应，下部铜矿体以低δ18O值为成矿富集中心。他变岩石δ18O值可作为该区勘查找矿的一种有效手段。

The analysis results of the hydrogen and oxygen isotopic elements from the Zijinshan copper-gold deposit show that the infiltration of precipitate water increased in the oreforming process from early to late, and presents the characteristics of the stage's evolution of fluid-rock interaction (Stage Ⅰ and Ⅱ ). The water/rock ratios (W/R) of ore-forming fluid are lower(0. 05-0. 2). The map of oxygen contours on No. 3 exploration line shows the gold orebodies correspond with the δ18O-high altered rocks which are located upon the gold orebodies, and δ18O-low altered rocks are quite coincident with the copper orebodies, and the lowest part of the copper orebodies is the enriched centre of copper oreforming. It is considered that the value of the oxygen isotope in the altered rock can be used as an effective way for prospecting and finding an ore in the Zijinshan area.