夹皮沟三道岔金矿床原生分散晕的特征及地球化学异常模式

三道岔金矿为一大型金矿床。该矿床受夹皮沟北西向弧型断裂带的控制,赋存于太古界鞍山群三道沟组下段条带状片麻岩(该队定为注入片麻岩)及斜长角闪岩带中(见图1)。大都是盲矿体,矿体赋存于蚀变破碎带中,为变质热液型含金石英脉。矿床已采到425米中段。

A GEOCHEMICAL STUDY OF THE SANDAOCHA GOLDDEPOSIT AT JIAPOGOU:CHARACTERISTICS OF ITSPRIMARY HALOS AND THE MODEL OFITS GEOCHMMICAL ANOMALIES

Primary halo studies have been conducted at a worked gold mining area which is badly in want of expansion of reserves. The distribution of the elements was made clear by means of factor analysis and point group analysis, and ore potentiality was predicted for anomalies around deep-seated portion of the orebody and at the surface. Characteristics of primary halos display apparent zoning of elements:Fand Hg are concentrated at the top of the orebody, serving as distant indicator elements; Ag and Pb are mostly observed at upper part; low value zones of Cu, Ni, and Voccur at the middle; Au and factor loading anomalies are distributed around the orebody. The vertical zona-tion of elements was established with the help of zonality indexes; the existence of a hidden orebody and its probable depth of burial was forecasted on thebasis of the distribution of Hg halos and residual anomalies-Hg tends toincrease at 300 m level of the main ore vein (ore vein No. 3). The surface anomaly (NO. 55-1), whose association with an orebody had failed to be verified by previous drilling, was reexamined by the primary halo method, and the element association of the anomalies defined implies the existence of a hidden orebody.