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安徽五河金矿整装勘查的重要发现及其地质意义
摘要
为实现覆盖区找矿新突破,通过建立适合郯庐断裂体系的继承性断裂控矿模式和覆盖区综合找矿模式,开展识别覆盖区薄层良导体的方法实验,研究安徽五河金矿整装勘查区的成矿及控矿规律。结果表明:NNE—NE向断裂是五河金矿整装勘查区的主要控矿构造,矿体空间展布与磁异常形态具有较好的对应性。结合覆盖区"一选三定四阶段反复循环"的综合找矿模式及低频磁电勘探法、地-井充电法和正反向电位法等找矿新方法,该区取得了较好的找矿效果。利用磁异常梯级带可寻找郯庐断裂带次级断裂,即控矿断裂,利用上述3种找矿新方法可准确圈定矿体位置,最终在五河金矿整装勘查区新发现了2处金多金属矿产地。以上控矿、综合找矿模式及找矿新方法对郯庐断裂体系及覆盖区找矿具有指导意义。
In order to make a new breakthrough in the prospecting of the coverage area, a suitable inherited fracture-controlling model for Tan-Lu fault system and a comprehensive prospecting model for the coverage area were established. Then an experimental method for identifying thin conductors in the coverage area was carried out to study Wuhe integrated exploration area mineralization and ore-controlling regularity. The results show that the NNE-NE fault is the main ore-controlling structure of Wuhe integrated exploration area. The spatial distribution pattern of the ore body has a good correspondence with the magnetic anomaly pattern. Combined with the ‘repeated circulation of one selection, three confirmation, four stages' comprehensive prospecting model, the low-frequency electrical magnetic exploration method, the ground-well charging method and the positive and negative potential method in the coverage area, better prospecting results were achieved in this area. The magnetic anomaly step belt is used to find the secondary fault of Tan-Lu fault zone, which is also the ore-controlling fault. These three prospecting methods mentioned above can be used accurately to locate the ore body, and finally two gold polymetallic mineral deposits were found in Wuhe integrated exploration area. It indicates that these ore-controlling, comprehensive prospecting models and new prospecting methods have some guiding significance on prospecting in Tan-Lu fault system and the coverage area.
引文
[1] 沈远超,曾庆栋,刘铁兵,等.郯庐断裂与金矿成矿[J].世界地质,2003,22(1):41-44.
[2] 蒋荣清,戴新义,刘劲鸿.吉林省夹皮沟金矿地质特征及成因探讨[J].吉林地质,1990(4):19-26. [3] 沈远超,曾庆栋,谢宏远.吉林省夹皮沟—海沟成矿带金矿定位时代[J].黄金科学技术,1999,7(2):19-26. [4] 李忠满,赵艳秋,温晓春.辽东南金矿床成矿模式及找矿信息[J].地质找矿论丛,2005,20(增刊1):66-70. [5] 王文清,曲亚军.辽东古元古代金矿地质特征及成矿模式[J].辽宁地质,2000,17(3):161-172. [6] 王有爵,李忠,范垂祥.辽宁省金矿集中区及其与构造样式的关系[J].长春地质学院学报,1988,18(2):137-146. [7] 燕守勋,王桂梁,邵震杰,等.鲁西地壳隆升的伸展构造模式[J].地质学报,1996,70(1):1-9. [8] 曾庆栋,沈远超,刘铁兵,等.山东临沂西部地区潜火山杂岩与金矿成矿系列[J].地质论评,1999,45(增刊1):572-576. [9] Burnham C W.Energy release in subvolcanic environments:Implications for breccia formation[J].Econ Geol,1985,80(6):1515-1522. [10] Maeda H.Volcanic activity,hydrothermal alteration and epithermal gold-silver mineralization in the Ryuo Mine area in the Kitami metallogenic province,Hokkaido,Japan[J].Resour Geol,1998,48(2):105-116. [11] 吕庆田,董树文,史大年,等.长江中下游成矿带岩石圈结构与成矿动力学模型——深部探测(SinoProbe)综述[J].岩石学报,2014,30(4):889-906. [12] 丁俊华,许文渊,吴厚泽.中国伴生金矿床[M].北京:地质出版社,1996. [13] 刘彦良,高雅,罗维斌,等.西秦岭温泉—中川一带金属矿床的成矿规律及找矿预测[J].中国地质调查,2018,5(4):40-49. [14] 张顺林,张家嘉,汪青松,等.安徽省五河县荣渡—大柳庄地区河口铅金矿普查地质报告[R].合肥:安徽省勘查技术院,2017:7-8,150. [15] 安徽省五河县金盛矿业有限公司.安徽省五河县长淮(钱台子)金矿资源储量核实报告[R].2004:1-2. [16] 何柳昌,产思维.徐宿弧(安徽段北部)弱磁异常特征及其认识[J].中国地质调查,2018,5(1):60-65. |