浙江金鸡岩金矿床中银金矿与黄铁矿的成因矿物学特征及其地质意义

GENETIC MINERALOGIC FEATURES OF THE ELECTRUM AND PYRITE IN THE JINJIYAN GOLD DEPOSIT, ZHEJIANG PROVINCE AND THEIR GEOLOGIC SIGNIFICANCE

金鸡岩金矿床中银金矿的形态不规则，粒度细，成色低。黄铁矿的金含量和砷含量分别为１７９３×１０－６和５１４３×１０－６（均为平均值），其Ａｕ／Ａｇ、Ｃｏ／Ｎｉ、Ｓ／Ｓｅ和Ａｓ／（Ｃｏ＋Ｎｉ）比值分别为０１９５、１５３、１４５×１０４和１９９３４。同时，矿区出现的黄铁矿都为单一Ｐ型黄铁矿，其热电动势（Ｖｐ）主要集中于３０～５０ｍＶ。所有这些资料都表明，金鸡岩金矿床具有与中—大型浅成低温火山热液型金矿床相似的特征，现已发现的矿段可能属矿体的上部，因此在该金矿的深部有可能找到下部金矿体。

he electrum in the Jinjiyan gold deposit, Zhejiang Province is irregular in morphology, small in grain size and low in relative purity. The average contents of Au and As of the pyrite in the deposit are 1793×10 -6 and 5143×10 -6 , and its average ratios of Au/Ag, Co/Ni, S/Se and As/(Co+Ni) are 0195, 153, 14500 and 19934 respectively. Moreover, all of the pyrites in the deposit are P type ones with a low thermoelectric potential (mainly in the range of 30～50mV). Evidently, the Jinjiyan gold deposit has the characteristics similar to those of the volcanogene epithermal gold deposits in a medium large scale. The ore blocks found ever may be the upper part of the ore body. Therefore, it is possible to find the lower part of the ore body in the depth of the deposit.