坦桑尼亚汉德尼金矿床地质特征与找矿方向分析

汉德尼（Handeni）金矿是近来在坦桑尼亚绿岩带中发现的大型金矿床。该金矿床产在坦桑尼亚元古宙绿岩带中，矿体位于元古代斜长角闪岩（原岩为基性火山岩）的断裂带中，矿体多呈脉状、似层状，局部网脉状和浸染状，其容矿围岩为石榴石英岩，矿化主要发育黄铁矿化、黄铜矿化、磁黄铁矿化和毒砂化等，金矿物主要为自然金和金银矿，一般颗粒较...

Geological Characteristics of the Handeni Gold Deposit in Tanzaniaand Its Ore-search Direction

Abstract:The Handeni gold mine is a large gold deposit recently discovered in a Proterozoic greenstone belt in Tanzania. The ore body is located in the fault zone of Proterozoic amphibolite rocks (its protolith is mafic volcanic rocks). The most ore bodies are of vein- and bedded-looking,and locally of vein network and dissemination forms. The ore-bearing country rock is garnet quartzite. The ore contains pyritization,chalcopyrite,pyrrhotite and arsenopyrite and so on. Gold minerals are mainly the natural gold and silver,which have generally big grains. Our study found that this ore deposit is controlled by a S-shaped ductile shear zone which extends from north to south. And ore bodies are concentrated at the turning points of the ductile shear zone. The future prospecting direction should focus on the sites with high-anomalies of Au,Cu,As,Zn and other elements as well as the turning loci on the ductile shear zone.