诸广山中段三江口铀矿床构造控矿特征及其找矿意义
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摘要
三江口铀矿床位于华南花岗岩型铀矿富集区,矿区内上堡断裂与黄洞口断裂、九龙江断裂等相互交切,共同构成了多个大小不同的三角状断块构造格局,赋矿构造主要分布在这些三角形地块中。构造岩主要有花岗碎裂岩、硅化碎裂岩、硅化角砾岩、微晶石英脉、角砾岩及碎裂花岗岩等,构造岩蚀变主要有硅化、赤铁矿化、水云母化及绿泥石化等。铀矿(化)体主要受F101、F101-1、F23、黄洞口及木洞断裂等控制;矿化带与断裂带规模具有正相关关系。控矿构造破碎带在成矿期具有由北往南、先强后弱的活动特点,因此矿化带具有明显的空间展布及变化规律。断裂构造及其力学性质的演化,对矿体形态、矿体的侧伏、成矿物质的迁移及富集等具有明显的控制作用。矿区内NNE向构造带及不同方向的构造交汇、夹持地段是重要的成矿部位,可作为下一步勘查的重点靶区。
Sanjiangkou uranium deposit is located in granite-type uranium enrichment region in south China, several triangular faulted block are developed in the intersection of Shangbao, Huangdongkou and Jiulongjiang fracture. The ore-hosting structures mainly distributed in triangular block. The tectonite are mainly granitic cataclasite, silicified granitic cataclasite, silicified breccia,microcrystalline quartz, breccia and cataclasticgranite, tectonic retelated alteration are mainly silicification, hematitization, hydromicatization and chloritization. The researches showed that the uranium mineralization are controlled by faulted structure such as F101, F101-1, F23 and Huangdongkou,the scale of uranium mineralization has good positive correlation with fracture belt scale, the activity of ore-controlling fracture bear the feature of strongly starting in north and weakly ending in south during the metallogenic period. Fracture structure, its mechanical properties and evolution has obviously effect in controlling the transport of ore substances, the enrichment of uranium mineralization and the morphology, pitch of orebody. Therefore, the favorable metallogenic area will be the intersection or clamping district by different direction faults.
Sanjiangkou uranium deposit is located in granite-type uranium enrichment region in south China, several triangular faulted block are developed in the intersection of Shangbao, Huangdongkou and Jiulongjiang fracture. The ore-hosting structures mainly distributed in triangular block. The tectonite are mainly granitic cataclasite, silicified granitic cataclasite, silicified breccia,microcrystalline quartz, breccia and cataclasticgranite, tectonic retelated alteration are mainly silicification, hematitization, hydromicatization and chloritization. The researches showed that the uranium mineralization are controlled by faulted structure such as F101, F101-1, F23 and Huangdongkou,the scale of uranium mineralization has good positive correlation with fracture belt scale, the activity of ore-controlling fracture bear the feature of strongly starting in north and weakly ending in south during the metallogenic period. Fracture structure, its mechanical properties and evolution has obviously effect in controlling the transport of ore substances, the enrichment of uranium mineralization and the morphology, pitch of orebody. Therefore, the favorable metallogenic area will be the intersection or clamping district by different direction faults.
引文
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[3]彭剑刚.三江口地区铀矿化特征及成矿机理探讨[J].四川建材,2008,1:124-125.
[4]曾宪科,覃金宁,周倩,等.诸广山中段三江口地区铀成矿机理探讨[J].中国核科学技术进展报告(第2卷),2011,373-377.
[5]费天伟,刘翔,覃金宁,等.湖南汝城三江口铀矿地质特征及成因探讨[J].南华大学学报(自然科学版),2012,26(3):39-46.
[6]施安荣,张晓虎,蔚志成,等.九龙江铀矿床地质特征及成因探讨[J].内蒙古科技与经济,2014,7:51-53.
[7]姜必广,何友宇,陈雄,等.“三九”地区三江口铀矿床成矿作用及成矿模式[J].铀矿地质,2017,33(5):266-271.
[8]李建威,李紫金,傅昭仁,等.遂川-热水走滑断裂带热异常与热液铀成矿作用[J].地质科技情报,2000,19(3):39-43.
[9]张寿庭,郑明华,龙训荣,等.萨瓦亚尔顿穆龙套型金矿床构造控矿特征[J].矿床地质,1998,17(增刊):961-964.
[10]李先福,傅昭仁,李建威,等.湘东-赣西NNE向走滑构造[J].大地构造与成矿学,2001,25(2):136-140.
[11]刘翔,肖建军,杨崇秋,等.遂川-热水走滑断裂带特征及其对丰州盆地铀成矿的控制作用[J].铀矿地质,1998,14(3):142-149.
[12]李建威,李先福,李紫金,等.湘赣边区中新生代走滑断裂系统及对热液铀成矿作用的控制[J].地质找矿论丛,2000,15(2):166-173.