| 江西银山多金属矿床的矿化分带 |
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| 引用本文：.1988.Metallogenic zoning of the Yinshan polymetallic ore deposit in Jiangxi province[J].Mineral Deposits,7(3):3~14 |
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| 中文摘要:银山多金属矿床与燕山早期的浅成火山作用有成因联系。金属矿化作用包括二个成矿期和五个成矿阶段。矿化的空间分布特征是不同时期形成的两个中心式矿化分带叠加的结果。主要的第Ⅰ期矿化奠定了分带的基础，第Ⅱ期次要矿化使之复杂化，成矿后的剥蚀差异亦对原生分带的格局造成影响。矿化分带特征反映在主要成矿元素、伴生元素、挥发组分、矿石和矿体特征、围岩蚀变及硫同位素组成的空间变化上。根据对成矿作用演化过程和矿化分带规律的研究，在银山矿区及其外围指出了进一步找矿的有望地段。 |
| 中文关键词:多金属矿床 成矿作用演化 矿化分带 江西银山 |
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| Metallogenic zoning of the Yinshan polymetallic ore deposit in Jiangxi province |
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| Abstract:The Yinshan polymetallic ore deposit is genetically related to early Yahshaman supergene volcanic activities. Volcanic activities associated with metallization can be divided into two stages, forming successively rhyodacite porphyries and dacite porphyries (Table 2). The metallization occurred in two ore-forming epochs which included five main stages (Table 2). From early stage to late, arsenic, gold and silver contents of metallogenic fluids were reduced, ore-forming temperature decreased, and the country rocks played an increasingly important role in metallization．The spatial distribution characteristics of metallization result from superimposition of two central-type zonations formed in different epochs. The major metaIlizatin epoch, i. e., the first epoch, laid the foundation of zonality. The inner zone is rich in copper; arsenic and gold, while the outer zone is rich in lead, zinc and silver; from the center to the edge, F-/Cl- ratio, Au/Ag ratio and SO3 content decrease (Fig.3, 5), whereas In/Ga ratio and cadmium and CO2 contents iscrease (Fig.4, 5). In addition, sulfur isotope composition and country rock alteration show regular vatiation (Fig.8). Lead-zinc orebodies formed in the outer zone also vary regularly in shape and size, showing in upward succession large-veinlike, small-veinlike and gentle stratoid orebodies (Table 6). Metallization of the second epoch，which possessed less importance, Was superimposed on the metallogenic zoning of the first epoch and made it complicated (Fig.2). The metallization center of the second epoch moved southwestward. The difference in post-ore denudation has exerted a further influence on the outward appearance of the metallogellic zonling and caused the vertical zoning pattern formecd during the ore-forming period to show horizontal zonation. On the basis of the above study on metallogenic evolution and zonation, some promising sectors for further ore prospecting in the Yinshan ore district are indicated. |
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