福建平和大小矾山—包围山地区成矿要素及找矿方向研究
发布时间：2018-08-14 14:18
【摘要】：福建平和大小矾山—包围山地区位于闽东沿海陆相火山盆地植被覆盖区,与紫金山矿田同处于上杭—云霄NW向铜、金、钼多金属成矿带上,是寻找“紫金山式”铜、金多金属矿的重要找矿靶区。但是该地区植被覆盖严重,以往勘查研究程度相对较低,虽然该区矿产资源丰富,且具有较大的“紫金山式”铜、金多金属矿床找矿潜力,但与该矿床相关的典型矿床成矿要素的研究还是空白,目前不但尚未建立起统一的基于陆相火山盆地植被覆盖环境下勘查理论找矿方法,而且该区找矿方向尚未明确。因此,结合已有研究成果,本文选重点取平和大小矾山—包围山地区开展成矿要素综合研究及成矿预测工作,并指明该区找矿方向。典型矿床研究表明,包围山花岗斑岩与容矿围岩—石帽山群地层底部凝灰熔岩锆石LA-ICP-MS U-Pb年龄分别为(98.1±1.1)Ma和(104.6±1.1)Ma;通过对包围山钼多金属矿体中辉钼矿的Re-Os同位素分析,获得其模式年龄为(95.2±1.5)Ma,为本区首次获得的精确成矿年龄。辉钼矿中Re的含量指示钼矿成矿作用与岩浆壳幔混合作用有关。大小矾山地区与紫金山铜金矿田具有相似的区域成矿地质背景,控矿构造、岩浆岩及岩相蚀变等主要成矿要素特征也类似,而火山机构中心部位发育的石英-明矾石化带和低温硅化带是该地区寻找“紫金山式”铜、金多金属矿床的重要标志。结合已有研究成果,本文认为大小矾山成矿预测区具有寻找浅成中低温热液型Cu、Pb、Zn矿、斑岩型Cu、Au多金属矿及火山(-次火山)热液型Ag、Pb、Zn矿的潜力,包围山成矿预测区老岩山—三斗坑—大峰山一带寻找斑岩型Mo多金属矿、火山(-次火山)热液型Ag、Pb、Zn矿的理想地段;小芹山成矿预测区是寻找浅成中低温热液型Fe、Au多金属矿的有利地段。NW向、NE向、环形火山断裂及多组断裂交汇部位所发育的的构造裂隙带是本区成矿的有利部位,物探及化探异常、围岩蚀变、金属矿化等主要沿NW向及NE向断裂分布,其中NW向裂隙构造带是成矿预测区最重要的导矿和储矿构造。
[Abstract]:The alanshan-bengshan area in Pingping, Fujian Province, is located in the vegetation cover area of the continental volcanic basin along the eastern Fujian coast, and is located in the copper, gold and molybdenum polymetallic metallogenic belt of Shanghang Yunxiao NW with the Zijinshan ore field. It is to look for "Zijinshan type" copper. The important prospecting target area of gold polymetallic ore. However, the vegetation cover in this area is serious, and the degree of exploration and research in the past is relatively low. Although the area is rich in mineral resources and has great prospecting potential of Zijinshan type copper and gold polymetallic deposits, However, there is still no research on the metallogenic elements of typical deposits related to the deposit. Not only has a unified prospecting method based on the vegetation coverage environment of continental volcanic basins not been established, but the prospecting direction in this area has not been clear. Therefore, combined with the existing research results, this paper focuses on the comprehensive study of metallogenic elements and metallogenic prediction in the Panshan-Baishan area, and points out the direction of prospecting in this area. The typical ore deposits show that the zircon LA-ICP-MS U-Pb age of tuffite at the bottom of the bailing granitic porphyry and the ore-bearing surrounding rock-Shimaoshan group is (98.1 卤1.1) Ma and (104.6 卤1.1) Ma.The Re-Os isotopic analysis of the molybdenum ore in the bengshan molybdenum polymetallic ore body is carried out. The model age is (95.2 卤1.5) Ma, which is the first accurate metallogenic age in this area. The content of re in molybdenum indicates that the mineralization of molybdenum ore is related to the mixing of magmatic crust and mantle. There are similar regional metallogenic geological background, ore-controlling structure, magmatic rock and lithofacies alteration and other main metallogenic elements in the area and Zijinshan copper-gold deposit field, and the characteristics of the main metallogenic elements are similar to those of the Zijinshan copper-gold field. The quartz alum petrochemical zone and the low temperature silicification zone developed in the central part of the volcanic mechanism are the important signs for searching for the Zijinshan type copper and gold polymetallic deposits in this area. Combined with the existing research results, it is considered in this paper that the large and small Fanshan metallogenic prediction area has the potential to search for the epigenetic low temperature hydrothermal Cu PbPbZn ore, the porphyry type Cu Pb au polymetallic ore and the volcanic (- subvolcanic) hydrothermal AgPbPbPnzn deposit. In the area of Laoyanshan-Sandoukeng-Dafengshan metallogenic prediction area, an ideal area for porphyry Mo polymetallic deposits and volcanic (-subvolcanic) hydrothermal AgPbPb-Zn deposits; The ore-forming prediction area of Xiaoqinshan is a favorable area. NW trending NE direction is the favorable area for finding the epithermal hydrothermal type Feo au polymetallic ore deposit. The tectonic fissure zone developed at the intersection of ring volcanic faults and multi-group faults is the favorable place for metallogenic formation in this area. Geophysical and geochemical anomalies, wall rock alteration and metal mineralization are mainly distributed along the NW and NE trending faults, among which the NW fracture structural zone is the most important ore-conducting and ore-reserving structure in the metallogenic prediction area.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.2
本文编号：2183125
[Abstract]:The alanshan-bengshan area in Pingping, Fujian Province, is located in the vegetation cover area of the continental volcanic basin along the eastern Fujian coast, and is located in the copper, gold and molybdenum polymetallic metallogenic belt of Shanghang Yunxiao NW with the Zijinshan ore field. It is to look for "Zijinshan type" copper. The important prospecting target area of gold polymetallic ore. However, the vegetation cover in this area is serious, and the degree of exploration and research in the past is relatively low. Although the area is rich in mineral resources and has great prospecting potential of Zijinshan type copper and gold polymetallic deposits, However, there is still no research on the metallogenic elements of typical deposits related to the deposit. Not only has a unified prospecting method based on the vegetation coverage environment of continental volcanic basins not been established, but the prospecting direction in this area has not been clear. Therefore, combined with the existing research results, this paper focuses on the comprehensive study of metallogenic elements and metallogenic prediction in the Panshan-Baishan area, and points out the direction of prospecting in this area. The typical ore deposits show that the zircon LA-ICP-MS U-Pb age of tuffite at the bottom of the bailing granitic porphyry and the ore-bearing surrounding rock-Shimaoshan group is (98.1 卤1.1) Ma and (104.6 卤1.1) Ma.The Re-Os isotopic analysis of the molybdenum ore in the bengshan molybdenum polymetallic ore body is carried out. The model age is (95.2 卤1.5) Ma, which is the first accurate metallogenic age in this area. The content of re in molybdenum indicates that the mineralization of molybdenum ore is related to the mixing of magmatic crust and mantle. There are similar regional metallogenic geological background, ore-controlling structure, magmatic rock and lithofacies alteration and other main metallogenic elements in the area and Zijinshan copper-gold deposit field, and the characteristics of the main metallogenic elements are similar to those of the Zijinshan copper-gold field. The quartz alum petrochemical zone and the low temperature silicification zone developed in the central part of the volcanic mechanism are the important signs for searching for the Zijinshan type copper and gold polymetallic deposits in this area. Combined with the existing research results, it is considered in this paper that the large and small Fanshan metallogenic prediction area has the potential to search for the epigenetic low temperature hydrothermal Cu PbPbZn ore, the porphyry type Cu Pb au polymetallic ore and the volcanic (- subvolcanic) hydrothermal AgPbPbPnzn deposit. In the area of Laoyanshan-Sandoukeng-Dafengshan metallogenic prediction area, an ideal area for porphyry Mo polymetallic deposits and volcanic (-subvolcanic) hydrothermal AgPbPb-Zn deposits; The ore-forming prediction area of Xiaoqinshan is a favorable area. NW trending NE direction is the favorable area for finding the epithermal hydrothermal type Feo au polymetallic ore deposit. The tectonic fissure zone developed at the intersection of ring volcanic faults and multi-group faults is the favorable place for metallogenic formation in this area. Geophysical and geochemical anomalies, wall rock alteration and metal mineralization are mainly distributed along the NW and NE trending faults, among which the NW fracture structural zone is the most important ore-conducting and ore-reserving structure in the metallogenic prediction area.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.2
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