论文部分内容阅读
主要是对威特沃特斯兰金矿床(南非共和国)和巴列伊成矿区(外贝加尔,俄罗斯),在区域构造位置、裂谷构造发育特征、裂谷基底特征、矿床成因矿化特征等11个方面进行了对比分析。由此揭示了两个矿床存在着一系列共同特征。首先矿床分布的区域规律性相似,它们都受大型裂谷带和裂谷带周围与构造岩浆活化有关的断裂带控制;同时构造岩浆活化两次发育的特点相似,早期形成了由双峰喷发岩岩层充填的火山洼地,及比较晚发育并叠加在火山洼地之上的陆源裂谷盆地本身。由此总结出寻找与不同时代裂谷构造有关的巨大型金矿床的三个找矿标志:①基底标志,绿岩带发育的前寒武纪深变质杂岩体;②两次形成的裂谷洼地,第一阶段形成了由双峰式喷发岩充填的洼地,第二阶段形成了以陆源杂岩体为主体的裂谷带本身;③由深大断裂和与深大断裂相交的使裂谷基底、裂谷边缘和裂谷中心具有块状结构的断裂构成的裂谷构架。本文特别强调指出,这两个金属矿床在矿床成因和年龄上存在很大差别的同时,也表现出了许多共同点。
Mainly on the Witwatersrand gold deposit (Republic of South Africa) and Palei mineralization area (outside Baikal, Russia), in the regional tectonic position, rift tectonic development characteristics, rift basement characteristics, genesis and mineralization characteristics of the deposit 11 aspects were comparative analysis. This reveals the existence of a series of common features between the two deposits. First of all, the regional distribution of ore deposits is similar. All of them are controlled by the fault zones related to tectono-magmatic activation around the large rift zone and rift zone. At the same time, the features of tectonic magmatic activation are similar to each other. Rock-filled volcanic depressions and the terrigenous rift basins that developed later and were superimposed on volcanic depressions. Therefore, it is concluded that there are three prospecting indicators for searching for huge gold deposits related to rift structures of different ages: ① the basement mark and the Precambrian deep metamorphic complex with greenstone zone development; ② the rift depression formed twice, In the first stage, depression formed by bimodal eruption rocks is formed. In the second stage, the rift zone itself is formed, which is mainly composed of terrigenous complex bodies. ③The combination of deep faults and deep faults to make rift base, Rift margin and rift center with a block structure of the fracture structure of the rift frame. This article stresses in particular that these two metal deposits show many differences in genesis and age of deposits while showing many similarities.