福建紫金山铜（金）矿与台湾金瓜石金（铜）矿的对比及其意义

Comparison of the Zijinshan Copper (Cold) Ores and the Jinguashi Gold (Copper) Ores and Its Geological Significance

福建西部的紫金山铜（金）矿与台湾北部的金（铜）矿其矿床（田）的很多特征十分相似，成矿的物理化学条件也很类同，表明其成矿作用在本质上是相同的，二者可以对比。依此为基础能够建立起一个综合性的有关火山／潜火山热液－斑岩成矿系到的两阶段三层模式。此模式对研究环太平洋地区中、新生代火山活动地区类似矿床具有启示意义。

oth the Zijinshan copper (gold) ores and the Jinguashi gold (copper) ores are the large-scale goldcopper deposits discovered in the two sides of Taiwan Strait. The former is located in the western part of Fujian Province and the latter in the northern part of Taiwan Province. The metallogenetic features and the ore-forming physical-chemical conditions of the two deposits are very similar. For the two deposits,the gold ores are formed in the epithermal (100-160℃, 5-14 MPa) and acid environment (pH 3.64), while the copper ores in the epi-mesothermal (160-300℃, 11- 14 MPa) and acid environment (pH 3. 86-3. 96). Therefore, it is considered that the minerogenesis of the two deposits are identical in essence and that both metallogenetic series can be combined to form a perfect metallogenetic model. From top to bottom, the model is composed of two stages (the volcanic-subvolcanic epithermal metallogenetic stage and the porphyry metallogenetic stage) and three types [the epithermal gold deposit (sulphate pattern ) → the epi-mesothermal copper deposit (sulphate pattern ) →the porphyry copper deposit]. It is believed that the model will help the further study of the volcanic and subvolcanic hydrothermal-porphyry minerogenesis and to search for the similar deposits in the Mesozoic and Cainozoic volcanic provinces around the Pacific.