摘要
羊鸡山金矿床,是近年来长江中下游地区所发现的一个与中酸性浅成—超浅成侵入岩类有关的较为典型的爆破岩简型斑岩金矿床。成矿岩体是由石英闪长岩和石英闪长玢岩两次侵入所构成的分异杂岩体。岩浆隐蔽爆破作用发育为其成矿岩浆作用的突出特征;爆破角砾岩与石英闪长玢岩紧密伴生构成爆破岩筒,并严格控制着金矿的形成和矿体的空间分布。羊鸡山金矿床与斑岩铜矿床系列各类铜矿床空间上密切相伴,处于同一构造—岩浆成矿带。二者成岩成矿机理也十分相近。作者认为在已知斑岩铜矿成矿区(带)内寻找斑岩金矿床,是进一步扩大金矿找矿的重要途径之一。
The Yangjishan gold ore deposit is a typical explosive pipe type porphyry gold ore deposit related to intermediate-acidic hypabyssal- hypergenic intrusive rocks discovered in middle-lower reaches of Yangtze River.The ore-forming intrusive body is a complex which is composed of quartz diorite and quartz diorite-porphyrite formed by two intrusions.The development of crypto-explosion of magma is characteristic of its ore-forming magmatism;The explosive pipe formed by the close association of explosive breccia with quartz diorite-porphyrite strictly controlled the formation of gold ore deposits and the spatial distribution of the goldorebodies.The Yang- jishan gold ore deposit is intimately linked with various copper ore deposits of the porphyry copper ore deposit series in a structral- magmatic-metallogenetic belt.They are similar in great detail in terms of their magmatic and mineralization mechanism.Therefore.to search for porphyry gold ore deposits in porphyry copper metalloge- netic districts (belts) is an important target for further searching gold in this region.
