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鹅公山火山盆地铀多金属矿床类型归属探讨
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摘要
鹅公山火山盆地是铀多金属矿产较丰富的火山盆地,前人业已发现3个小型铀矿床和1个小型金银矿床。在对火山盆地地质构造环境演化及中生代火山岩浆作用等成矿地质条件分析的基础上,结合铀多金属矿床地质特征及成矿方式,认为中生代火山-潜火山岩浆热液系统孕育了铀多金属矿成矿作用,矿化与潜火山岩体(脉)具时空关联,火山盆地内铀多金属矿床金属矿物及围岩蚀变与我国东部中生代潜火山岩型铜银多金属矿床具可比性。据此,将鹅公山火山盆地内铀多金属矿床均归属为潜火山岩型矿床,为后续地质勘查工作明确了找矿方向。
Egongshan volcanic basin is rich in uranium-polymetallic minerals.Prodecessors have already discovered three small uranium deposits and one small gold and silver deposit.On the basis of analyzing the evolution of geological tectonic environment of the volcanic basin and the mineralization geological condition such as the volcanic magma activity in Mesozoic,combining with the geological characteristics and metallogenetic model of the uranium polymetallic deposit,it is considered that Mesozoic volcanic-crytovolcanic magmatic hydrothermal system breeds mineralization of the uranium-polymetallic deposits.The mineralization is associated with the crytovolcanic rock mass(dike) in time and space.The metal ores and wall rock alteration in the uranium-polymetallic deposits in volcanic basin are comparable to these in the Mesozoic crytovolcanic-type Cu-Ag polymetallic deposits in East china.Accordringly,the uranium-polymetallic deposits in Egongshan volcanic basin is attributed to crytovolcanic-type deposits.It helps the prospecting direction clear for the subsequent geological exploration.
引文
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