若尔盖地区510-1铀矿床矿物组合垂直分带特征及找矿意义
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摘要
510-1铀矿床是若尔盖地区极具代表性意义的典型铀矿床之一。本文通过详细的野外地质观察和室内光、薄片矿物成分鉴定总结,将510-1碳硅泥岩型铀矿床自上而下依次划分为"酸帽"带、"酸碱共生"带和"碱性基底"。"酸帽"带(1中段及以上矿段),主要发育石英脉;"酸碱共生"带(2-4中段),石英脉与方解石脉均较发育,尚发育原生硫化物,如黄铁矿、黄铜矿、闪锌矿等;"碱性基底"(5-7中段及以下),大量发育方解石脉,很少见石英脉,且原生硫化物发育。矿床第5中段为"酸碱分离"的过渡地带(距地表矿化露头约320m),也是下部矿带与中部矿带的分界部位。上述矿床的分带特征,对若尔盖铀矿田其它矿床的勘查工作具有参考指导意义。
The 510-1 uranium ore deposit is significant in representing as typical regional ore deposit in Zoige County. Through detailed geologic observation in the field and identification of mineral compositions on polished sections and thin sections in the lab, the 510-1 carbonaceous-siliceous-argillitic rock-type uranium deposit can be divided into an upper, a middle and a lower ore zone. Quartz veins formed towards the top of the ore deposit(level No.1 and above). Both quartz veins and calcite veins are to be found in the middle zone(level No.2 to No.4),include primary sulphide minerals(pyrite, chalcopyrite, sphalerite, etc.). Whereas, in the lower ore zone(level No.5 to No.7 and below), only calcite veins and primary sulphide minerals are present but no quartz veins are found. The research indicates that there exists an "acid and alkali isolation" geochemical interface near level No.5 of the 510-1 uranium deposit(320 m or so below the current surface mineralized outcrop). Zoning characteristics of these mineral assemblages provide an important reference for further exploration of Zoige uranium ore field and other deposits.
The 510-1 uranium ore deposit is significant in representing as typical regional ore deposit in Zoige County. Through detailed geologic observation in the field and identification of mineral compositions on polished sections and thin sections in the lab, the 510-1 carbonaceous-siliceous-argillitic rock-type uranium deposit can be divided into an upper, a middle and a lower ore zone. Quartz veins formed towards the top of the ore deposit(level No.1 and above). Both quartz veins and calcite veins are to be found in the middle zone(level No.2 to No.4),include primary sulphide minerals(pyrite, chalcopyrite, sphalerite, etc.). Whereas, in the lower ore zone(level No.5 to No.7 and below), only calcite veins and primary sulphide minerals are present but no quartz veins are found. The research indicates that there exists an "acid and alkali isolation" geochemical interface near level No.5 of the 510-1 uranium deposit(320 m or so below the current surface mineralized outcrop). Zoning characteristics of these mineral assemblages provide an important reference for further exploration of Zoige uranium ore field and other deposits.
引文
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[11]胡旭刚,陈友良,叶永钦,等.若尔盖510-1铀矿床包裹体气体成分特征浅析[J].矿物学报,2013,33(S2):216-217.
[12]张成江,陈友良.510-1铀矿床垂直分带规律的发现及其成因意义[J].地质与勘探,2010,46(3):434-441.
[13]陈友良,侯明才,朱西养,等.若尔盖铀矿田含矿岩系的岩石特征及成因探讨[J].成都理工大学学报(自然科学版),2007,34(5):553-558.
[2]金有忠,李庆阳,刘建华,等.若尔盖铀矿田成矿条件与发展远景浅析[J].西南铀矿地质,2005,11(1):11-25.
[3]金景福,倪师军,胡瑞忠.302铀矿床热液脉体的垂直分带及其成因探讨[J].矿床地质,1992,11(3):252-258.
[4]倪师军,胡瑞忠,金景福.302铀矿床热液的混合和沸腾垂直分带模式[J].铀矿地质,1994,10(2):70-77.
[5]杜乐天.迎接铀矿找矿新高潮—华南二轮找矿势在必行[J].铀矿地质,2005,21(3):146-151.
[6]陈亮.若尔盖碳硅泥岩型铀矿床成矿物质来源探讨[D].成都:成都理工大学,2007.
[7]陈友良.若尔盖地区碳硅泥岩型铀矿床成矿流体成因和成矿模式研究[D].成都:成都理工大学,2008.
[8]陈友良,朱西养,张成江,等.若尔盖铀矿田流体成矿地球化学示踪研究[J].矿物学报,2009,29(S1):301-303.
[9]陈友良,魏佳,叶永钦,等.若尔盖铀矿田方解石稀土元素与碳氧同位素地球化学特征及其意义[J].地球科学进展,2012,27(10):1061-1067.
[10]赵聪,陈友良,朱西养,等.若尔盖铀矿田碳氧同位素特征及其成因[J].四川地质学报,2012,32(3):272-275.
[11]胡旭刚,陈友良,叶永钦,等.若尔盖510-1铀矿床包裹体气体成分特征浅析[J].矿物学报,2013,33(S2):216-217.
[12]张成江,陈友良.510-1铀矿床垂直分带规律的发现及其成因意义[J].地质与勘探,2010,46(3):434-441.
[13]陈友良,侯明才,朱西养,等.若尔盖铀矿田含矿岩系的岩石特征及成因探讨[J].成都理工大学学报(自然科学版),2007,34(5):553-558.