河南老里湾银矿成矿地质特征及找矿方向

河南省洛宁县老里湾银矿的发现是崤山断隆东部地区重要的找矿成果。对老里湾银矿床的成矿地质背景、矿床地质特征及控矿因素等进行了详细的研究,认为构造条件是控矿的重要因素,矿体赋存在区内五条断裂带内的构造蚀变岩带中。矿化与岩浆岩分布有紧密联系,成矿元素沿似斑状二长花岗岩内外接触带及断裂破碎带分布成矿,总体上在岩体上部形成不规则的矿化富集带。区内岩石蚀变强烈,由中心(断裂构造)向外(围岩)呈近于平行和对称分布的蚀变分带。结合区内化探异常成果,笔者认为矿区预测远景资源量有望新增为一个大型银矿和一个中型铅锌矿,且区域范围内具有继续寻找同类型矿床的潜力。

Metallogenic Characteristics and Prospecting Direction of the Laoliwan Silver Deposit in Hennan Province

The discovery of Laoliwan silver deposit is an important ore -searching achievement in Luoning County , Henan Province .On the basis of detailed research on metallogenic background , geological characteristics and ore -controlling factors of Laoliwan deposit , it could be concluded that tectonic conditions are major ore -controlling factors , and ore-bodies occured in five tectonic altered rock belts within the fault zone .Mineralization was closely related to magmatic rocks .Ore-forming elements were distributed in the inner and outer contact zone of porphyritic monzonitic gran -ite and faulted fracture zones .Irregular shaped mineralization enrichment zone was generally formed in the top part of magmatic rocks .Intensive rock alteration was well developed within the deposit . Alteration zonation was characterized by parallel and symmetrical distribution from the center ( frac-ture) to the outside (wall rocks).Combined with geochemical anomaly results , it can be conclu-ded that additional prospective resources in Laoliwan can include a large silver deposit and a medi -um lead-zinc ore deposit .Furthermore , there is a huge potential for prospecting same type silver deposits in Laoliwan and adjacent areas .