Yanshanian NE-Striking Fault Evolution and Its Implications on Mineralization in the Xitian W-Sn Polymetallic Ore Field, Hunan Province
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摘要: 为了确定湖南锡田矿田燕山期NE向断层演化历史、蚀变特征及与钨锡成矿关系本文调查了矿田内燕山期断层野外宏观特征,对断层中充填石英脉进行了显微鉴定、阴极发光、含矿元素分析,结果显示:(1)断层以NE60°~70°平行分布于茶汉盆地南北两侧,均倾向茶汉盆地,断层的陡倾、棱角状角砾及梳状石英等指示了断层的张性性质;(2)断层经历了3期流体活动,第一期的石英脉中石英颗粒相对粗大(0.5~15.0 mm),局部发育破裂与变形纹,石英可为断层角砾;第二期与第三期沿断层中张性裂隙充填的石英脉,粒径较小(0.01~2.00 mm),第二期石英发育微裂隙,而第三期石英为自形长柱状,无变形;(3)第一期与第三期石英脉中不含云母,第二期则富含绢云母,其W、Sn元素含量高,并有少量白钨矿、黄铁矿等矿物,其组分演化特征与区内矿床热液组分演化趋势相似;(4)锡田地区燕山期钨锡矿化分布与NE向系列断层关系密切,显示了茶汉盆地两侧由南向北分带格局.作者认为在燕山期华南伸展背景控制下,地幔上隆及重熔岩浆上侵产生的综合伸展是NE向系列断层形成的可能机制,NE向系列断层的张性环境是岩浆热液聚集的有利因素,为成矿热液运移提供了通道.Abstract: In order to determine the fault activity history and its relationship with hydrothermal alteration and W-Sn mineralization,we investigated the field characteristics of the Yanshanian faults in the Xitian ore field and carried out microscopic identification,cathodoluminescence and ore-forming element analysis on quartz in faults. The results show that:(1) The faults are distributed in northern and southern sides of the Chahan basin and dipping to the basin,with striking directions of NE 60°-70°. High dip angles,angular breccias and pectination quartz veins in the faults indicate extensional characteristics. (2) Three stages of magmatic fluid activities occurred in the faults. The stage Ⅰ is characterized by quartz veins occurring as coarse quartz particles (0.5-15.0 mm) with local deformation and fragmentation structures. The stage Ⅱ and stage Ⅲ are typically quartz veins filling in tensile fractures with small quartz particles (0.01-2.00 mm). Moreover,stage Ⅱ quartz develops microcrack structures while stage Ⅲ quartz is idiomorphic and unreformed,suggesting a progressively weakening trend of fault deformation. (3) In contrast to stage Ⅰ and stage Ⅲ mica-free quartz veins,stage Ⅱ quartz veins involve more micas with the high contents of W and Sn elements and minor scheelites and pyrites,which show similar compositional evolutionary characteristics to that of the W-Sn deposits in the Xitian ore field. (4) The distribution of Yanshanian mineralization in the Xitian ore field is closely related to the normal faults,showing clear and regular mineralizing zonation of W-Sn and Pb-Zn deposits from the south to the north on each side of the Chahan Basin. Under the control of extensional tectonic setting of the South China Block during Yanshanian,the comprehensive extension resulting from mantle uplift and remelted magmatic intrusion may be a potential mechanism for the formation of normal faults. The extensional environment of the normal faults was favorable to accumulation of magmatic hydrothermal fluids; and the normal faults provided a channel for the migration of ore-forming hydrothermal fluids.
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Key words:
- normal faults /
- fluid activity /
- W-Sn mineralization /
- Xitian ore field /
- mineralogy
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图 1 湖南锡田矿田燕山期构造纲要图
据伍式崇等(2013)修改
Fig. 1. The structural map during Yanshanian in Xitian ore field, Hunan Province
图 5 NE向断层中不同期次石英脉的显微照片与CL图
a.第一期石英脉中破裂、碎粉状石英;b.第一期石英脉中的石英发育变形纹与强波状消光;c.第二期石英脉沿第一期石英脉的裂隙分布, 并富含云母;d.第二期石英脉中的粒状石英;e.第二期的石英脉中发育少量白钨矿;f.第三期长柱状并呈梳状排列石英;g.第一期石英的破裂特征;h.第二期石英只发育裂隙;i.第三期石英脉穿切第二期石英; a~c, e, g, h为锡湖断层, d, f, i为狗打栏断层;a~d与f为正交偏光照片, e为单偏光照片, g~i为CL照;Qz.石英;Sch.白钨矿
Fig. 5. The photomicrograph and cathodoluminescence of quartz
表 1 主要断层带控制点与样品信息表
Table 1. The samples information of fault in Xitian ore field
点号 坐标X 坐标Y 产状(°) 断层性质 6D1115-4 2975161 474692 290∠60 正断层 6D1115-7 2975436 475521 355∠75 正断层 6D1115-8 2975007 474940 295∠55 正断层 6D1115-13 2976547 474392 310∠65 正断层 6D1118-3 2973279 476869 335∠86 正断层 6D1118-10 2974756 477507 320∠70 正断层 6D1119-1 2977036 475800 320∠70 正断层 6D1119-9 2971921 479268 335∠70 正断层 6D1115-6 2975314 475245 195∠60 正断层 6D1115-12 2975408 474113 310∠70 正断层 6D1115-14 2976392 474640 365∠60 正断层 6D1115-16 2976332 474253 300∠70 正断层 6D1116-2 2971860 479047 150∠80 正断层 6D1118-5 2969648 476752 350∠75 正断层 6D1119-3 2977745 475443 305∠60 正断层 6D1119-7 2971676 478716 350∠75 正断层 6D1119-8 2971798 479047 180∠77 正断层 6D1119-12 2971889 479903 350∠50 正断层 7D0927-1 2972018 477790 10∠75 正断层 7D0927-2 2971800 479140 330∠60 正断层 7D0927-3 2971897 479893 330∠75 正断层 7D0927-6 2981366 480291 310∠75 正断层 7D0927-7 2980671 477903 300∠80 正断层 7D0927-8 2980627 477860 295∠70 正断层 7D0927-10 2980195 477859 305∠66 正断层 7D0927-11 2979837 477694 340∠80 正断层 7D0929-21 2969228 477003 330∠75 正断层 7D0929-27 2969031 476919 330∠70 正断层 7D0924-10 2968216 469509 330∠72 正断层 6D1205-4 2973909 470301 300∠78 正断层 6D1208-1 2968779 480920 330∠78 正断层 6D1208-2 2968656 480561 330∠72 正断层 7D0927-2 2957282 489283 140∠85 正断层 6D0823-18 2959120 487249 345∠80 正断层 6D0822-8 2963644 490605 160∠57 正断层 6D0822-10 2965590 487900 150∠81 正断层 6D0823-16 2960202 486532 145∠70 正断层 6D0823-14 2960830 487843 125∠70 正断层 6D0816-12 2960721 483896 170∠60 正断层 6D0816-13 2960744 484000 160∠61 正断层 6D0817-10 2957170 482685 170∠86 正断层 6D1206-1 2989525 480180 171∠72 正断层 6D1206-5 2989495 479794 180∠40 正断层 6D1206-7 2989589 478801 150∠50 正断层 6D1207-1 2989872 475246 135∠72 正断层 6D1207-3 2989870 476652 160∠73 正断层 6D1207-6 2990054 476624 150∠75 正断层 6D1207-7 2989899 477258 180∠90 正断层 6D1207-10 2989899 477479 160∠72 正断层 6D0430-3 2985021 464045 150∠70 正断层 7D0430-4 2984610 464153 150∠70 正断层 7D0502-5 2981859 460684 150∠75 正断层 7D0502-6 2981762 460598 150∠75 正断层 7D0503-1 2983476 460809 155∠70 正断层 7D0503-2 2988424 463305 155∠71 正断层 6D0811-2 2990355 468407 170∠68 正断层 6D0811-3 2991283 468881 170∠70 正断层 6D0811-4 2992344 470841 155∠70 正断层 6D0811-5 2992218 471915 160∠72 正断层 6D0811-8 2989416 472819 150∠55 正断层 6D0605-1 2998308 474023 180∠69 正断层 6D0605-2 2997662 474021 180∠69 正断层 6D0602-2 2993281 465497 160∠60 正断层 5D0616-6 2994480 476448 170∠80 正断层 5D6-1 154∠45 正断层 5D8-2 125∠79 正断层 8D6-2 155∠30 正断层 10D10-1 不清 12D1-1 165∠20 正断层 7D0925-17 2963196 474680 150∠85 正断层 7D0926-12 2966227 480895 150∠75 正断层 7D0926-12 2966233 480905 150∠76 正断层 7D0926-12 2966240 480925 150∠78 正断层 7D0927-1 2957307 489264 110∠60 正断层 6D0816-14 2960661 484136 155∠62 正断层 6D0817-1 2962312 476791 150∠60 正断层 6D0817-2 2959665 481425 345∠54 正断层 6D0817-04 2958172 480600 110∠70 正断层 6D0817-05 2957469 480579 165∠80 正断层 6D0817-08 2957382 482909 220∠70 正断层 6D0817-06 2956976 482496 155∠84 正断层 6D0817-11 2957044 482633 140∠86 正断层 表 2 锡田矿田断层蚀变岩成矿元素含量及特征值统计表
Table 2. The ore-forming elements content and statistical value of alteration rock in the Xitian ore field
样品编号 位置 样品 断裂名称 Ag Bi Cu Mo Pb Sn W Zn 24D1 垄上村 断层泥 上寨断裂 24.50 108.00 919 0.5 300 1 560 150 846 24D2 断层泥 上寨断裂 5.90 47.00 1 080 2.0 84 641 2 470 466 24D3 断层泥 上寨断裂 0.50 0.15 75 14.0 21 143 446 141 24D4 断层泥 上寨断裂 0.10 0.15 46 1.0 7 128 77 182 24D11-2 断层泥 上寨断裂 0.10 0.15 19 1.0 36 125 178 91 24D13-1 断层泥 上寨断裂 0.10 0.15 13 2.0 12 116 114 122 24D9-1 断层泥 上寨断裂 0.10 0.15 6 2.0 44 43 290 24 24D10-1 断层泥 上寨断裂 0.80 0.15 37 1.0 57 113 292 62 24D15-1 断层泥 上寨断裂 0.10 0.15 42 2.0 18 36 284 72 1D6-3 麦源村 硅化蚀变岩 鸡冠石断裂 0.25 1.00 94 5.0 58 12 11 66 2D4-2 卧龙村 硅化蚀变岩 鸡冠石断裂 0.25 1.00 6 3.0 55 21 6 74 2D5-3 沛江村 硅化蚀变岩 鸡冠石断裂 0.25 1.00 2 2.0 8 2 2 6 3D6-1 攸县 硅化蚀变岩 鸡冠石断裂 0.25 1.00 102 0.5 54 12 21 101 5D4-2 东坪村 硅化蚀变岩 茶汉断裂 0.25 1.00 2 1.0 9 18 3 19 5D6-1 茶汉断裂 硅化蚀变岩 茶汉断裂 1.00 1.00 2 7.0 130 1 8 14 5D8-2 湘东钨矿 硅化蚀变岩 茶汉断裂 1.40 1.00 409 2.0 34 163 28 1 570 8D6-2 硅化蚀变岩 茶汉断裂 0.25 5.00 6 2.0 4 10 10 2 10D10-1 断层泥 茶汉断裂 2.00 11.00 137 5.0 46 162 20 173 12D1-1 断层泥 茶汉断裂 2.60 36.00 127 5.0 53 143 25 320 克拉克值① 0.07 0.17 26 0.5 15 1.4 0.6 76 平均值 2.00 11.00 164 3 54 181 233 229 标准差 5.60 27.00 310 3 67 363 557 383 变异系数 3.5 3.0 1.9 1.0 1.2 2.0 2.4 1.7 富集系数 31 67 6 6 4 130 389 3 注:①中国东部大陆地壳, 单位:10-6;富集系数为元素平均含量与克拉克值的比值, 变异系数为标准差与平均值的比值. -
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