玻利维亚劳拉尼矿区根据浅成低温热液矿床推测斑岩型矿床存在的原因分析
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摘要
玻利维亚拉巴斯市劳拉尼(Laurani)矿区位于南美洲安第斯山成矿带中部,矿区大面积出露中酸性浅成或超浅成英安斑岩,斑岩中广泛而普遍的发育有高龄石化、石英明矾石化、褐铁矿化等热液蚀变,浅地表位置形成了浅成低温热液金银铜多金属脉状矿体。通过研究矿化类型、蚀变等特征,认为矿区显示出明显的斑岩型矿床特征。从矿床空间分布来看,套叠模型揭示了浅成低温热液型矿床与斑岩型矿床的空间关系,同时将两者的成因统一起来,初步推测劳拉尼金银铜多金属矿床底部或周围存在斑岩型矿床。
Bolivia city of La Paz, Lara(Laurani) mining area is located in the central Andean metallogenic belt of South America, in a large area of exposed in acidic shallow or ultra shallow dacite porphyry, porphyry in the widespread development of advanced petrochemical, limonitization quartz alunite, such as hydrothermal alteration, forming a shallow surface position the ore forming shallow epithermal gold silver copper polymetallic ore. By studying the characteristics of mineralization and alteration, it is considered that the ore deposits show obvious porphyry type deposits. From the point of view of the distribution of deposits, overlapping model reveals the spatial relationship between shallow epithermal deposits and porphyry copper deposits, and the unification of the causes, speculated that the porphyry deposits exist Lara, gold and silver copper polymetallic deposit at the bottom or around.
Bolivia city of La Paz, Lara(Laurani) mining area is located in the central Andean metallogenic belt of South America, in a large area of exposed in acidic shallow or ultra shallow dacite porphyry, porphyry in the widespread development of advanced petrochemical, limonitization quartz alunite, such as hydrothermal alteration, forming a shallow surface position the ore forming shallow epithermal gold silver copper polymetallic ore. By studying the characteristics of mineralization and alteration, it is considered that the ore deposits show obvious porphyry type deposits. From the point of view of the distribution of deposits, overlapping model reveals the spatial relationship between shallow epithermal deposits and porphyry copper deposits, and the unification of the causes, speculated that the porphyry deposits exist Lara, gold and silver copper polymetallic deposit at the bottom or around.
引文
[1]Barrera I,Luis;Flores B.,Oscar;Jimenez C.;Nestor等,1993,Berenuela和Laurani地区的地质和矿化,安第斯山脉中部新近纪-第四纪火山络合物中贵金属的研究,美洲开发银行,美国,华盛顿特区。
[2]Cunningham,Charles G;Mc Namee,James;Pinto-Vasquez,Jose等.玻利维亚火山穹丘内贵金属矿床模型.经济地质,1991,84(2):415-421 Erickson,G.E.,Cunningham,C.G.等.安第斯山脉中部晚第三纪、第四纪火山杂岩内浅成热液贵金属矿床,Kirkham,R.V.,Sinclair,W.D.,Thorpe,R.I.,and Duke,J.M编辑,矿床建模:加拿大地质学会,专项论文40:419-431.
[2]Cunningham,Charles G;Mc Namee,James;Pinto-Vasquez,Jose等.玻利维亚火山穹丘内贵金属矿床模型.经济地质,1991,84(2):415-421 Erickson,G.E.,Cunningham,C.G.等.安第斯山脉中部晚第三纪、第四纪火山杂岩内浅成热液贵金属矿床,Kirkham,R.V.,Sinclair,W.D.,Thorpe,R.I.,and Duke,J.M编辑,矿床建模:加拿大地质学会,专项论文40:419-431.