云南炉坪铅多金属矿床地质特征及找矿方向
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摘要
云南鹤庆炉坪铅多金属矿床是新发现的一个大型隐伏矿床,位于北衙超大型金多金属矿床北部,属北衙金多金属矿田斑岩—热液成矿体系的组成部分,是该成矿体系中的新类型矿床。对比北衙矿区的成矿特点,认为在北衙向斜构造的轴部应该存在构造薄弱地带,能够为万硐山正长斑岩成矿体系中的成矿流体运移提供通道和赋存空间,同时结合良好的Pb-Au-Ag-Zn-Cu-As-Sb组合异常显示,通过钻探验证而发现的铅多金属隐伏矿床。矿体沿中三叠统北衙组灰岩与下三叠统青天堡组砂泥岩层间及中三叠统北衙组灰岩内层间破碎带产出,已探获铅金属量大于80万t,金金属量近20 t,银金属量大于1000 t、锌金属量大于11万t。文章在总结矿区地质特征的基础上,指出了新的找矿方向。
The Luping poly -metallic lead deposit is a large - scale sized concealed deposit discovered recently in the Heqing area,Yunnan.It is located at the north of Beiya super - large sized poly - metallic gold deposit,and is an integrated part of Beiya porphyry - hydrothermal mineralization system,it belongs a new deposit style.On the basis of studying the regional geological conditions and comparing with the metallogenetic characteristics of Beiya gold deposit,guiding by the exploration clue that the weak structures are located in the axes of Beiya syncline,which can provide the pass way and space for the mineralization fluid from the Wandongshan synite mineralization system,in combination of the strong geochemical anomaly of Pb - Au - Ag - Zn - Cu - As - Sb elements in the area, then the test drilling was conducted and the Luping poly - metallic lead deposit was discovered.The orebodies occur in the interlayer fractures between the limestone of Middle Triassic Group Beiya Formation and the sandy mudstone of Lower Triassic Qingtianpu formation, as well as the interlayer fractures within the limestone of Middle Triassic Group Beiya Formation.Currently the estimated deposit resource tonnage is more than 800,000 tons of lead metal,1,000 tons of silver metal,110,000 tons of zinc metal and near 20 tons of gold metal.Finally the authors proposed the prospecting targets in the deposit area and that will be very helpful for further exploring in the mineralizing zone.
The Luping poly -metallic lead deposit is a large - scale sized concealed deposit discovered recently in the Heqing area,Yunnan.It is located at the north of Beiya super - large sized poly - metallic gold deposit,and is an integrated part of Beiya porphyry - hydrothermal mineralization system,it belongs a new deposit style.On the basis of studying the regional geological conditions and comparing with the metallogenetic characteristics of Beiya gold deposit,guiding by the exploration clue that the weak structures are located in the axes of Beiya syncline,which can provide the pass way and space for the mineralization fluid from the Wandongshan synite mineralization system,in combination of the strong geochemical anomaly of Pb - Au - Ag - Zn - Cu - As - Sb elements in the area, then the test drilling was conducted and the Luping poly - metallic lead deposit was discovered.The orebodies occur in the interlayer fractures between the limestone of Middle Triassic Group Beiya Formation and the sandy mudstone of Lower Triassic Qingtianpu formation, as well as the interlayer fractures within the limestone of Middle Triassic Group Beiya Formation.Currently the estimated deposit resource tonnage is more than 800,000 tons of lead metal,1,000 tons of silver metal,110,000 tons of zinc metal and near 20 tons of gold metal.Finally the authors proposed the prospecting targets in the deposit area and that will be very helpful for further exploring in the mineralizing zone.
引文
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[2]李光斗,念红,张道红,等.扬子地台西缘富碱斑岩铜金多金属矿床成矿条件及找矿前景[M].北京:地质出版社,2010:1 -301.
[3]崔银亮,晏建国,陈贤胜.北衙金矿床找矿标志和找矿模式研究[J].黄金,2003,(7):7-10.
[4]崔银亮.云南省与富碱斑岩有关的金矿床围岩蚀变特征和找矿前景[J].地质与勘探(增刊),2003:369-372.
[5]温汉捷,裘愉卓,胡耀国,等.滇西一滇西北斑岩型金矿床成矿地质特征及控矿条件研究[J].地质与勘探,2003,39(5):14- 19.
[6]蔡新平.滇西北衙金矿矿床特征、成因及找矿远景预测[C]//中国金矿地质地球化学研究,北京:科学出版社,1993:134- 151.
[7]云南省地质矿产局.云南省区域地质志[M].北京:地质出版社.1989:1-728.
[8]胡样昭,万方.滇西富碱花岗斑岩的岩石学与成因[J].中国有色金属学报,1995,5(1):1-3.
[9]葛良胜,郭晓东,邹依林,等.云南北衙金矿床地质特征及成因研究[J].地质找矿论丛,2002,17(1):32～46.
[10]李元,秦德先,黎诚.北衙金矿的氧化特征及找矿意义[J].昆明理工大学学报,1999,24(1):120-124.
[11]陈剑,晏祥云.云南省鹤庆县北衙金矿成矿地质特征分析[J].西南矿产地质,1993,(4):39-42.