安徽省霍山县东溪-南关岭金矿地质特征与成矿条件

东溪-南关岭金矿为北淮阳东段发现的第一个原生金矿，产于磨子潭-晓天中生代火山盆地边缘，容矿围岩为安山质-英安质火山岩，矿化和蚀变受桐柏-桐城深大断裂带的次级构造带控制。该金矿发育陡倾斜的脉状矿体和缓倾斜的似层状矿体，成因类型为冰长石-绢云母型浅成低温热液金矿。火山岩盆地之下的变质基底可能起到了初始矿源层作用，桐柏-桐城断裂带及其次级构造破碎带为重要的导岩导矿构造，早白垩世强烈的岩浆活动提供了热源、动力源和部分矿源。参照国内外类似金矿的特征，认为本区成矿地质条件良好，有可能隐伏着与石英正长岩体有关的细脉浸染型矿化，晓天火山盆地具有良好的找矿前景。

Geological characteristics and ore-forming conditions of Dongxi-Nanguanling gold deposit,Huoshan county,Anhui Province

Dongxi-Nanguanling gold deposit, the first prinary gold deposit founded in the eastern sec- tion of North Huaiyang tectonic belt, is located in the southeast boundary of Xiaotian volcanic basin. The host rocks are mainly andesitic-dacitic volcanics. Gold mineralization and alteration are controlled by the second-order tectonic belt of Tongbai-Tongcheng deep fault. Two types of mineralization systems are rec- ognized, which are gentle-dipping mineralization bedded system and steep-dipping mineralization vein sys tern. The genetic type of the deposit belongs to the adularia-sericite epithermal gold deposit. The old met- amorphosed basement of the volcanic basin may be the primary source layer and the Tongbai-Tongcheng deep fault and its secondary tectonic fracture zones are important ore deriving structures. The intensive magmation during the lower Cretaceous supplied heat sources, dynamic source and part of ore source. Consulting the characterisics of the gold deposits at home and abroad, this paper considered that the stud- ied area is possessed of favourable metallogenic geologic conditions, showing great possibilities of hidden veinlet disseminated mineralizations associated with the quartz-syenite, and the prospecting potential is tremendous in Xiaotian volcanic basin and the eastern section of North Huaiyang tectonic belt.