THE "MULTI-POSITION IN ONE" MODE AND DYNAMIC MECHANISM OF MINERALIZATION OF TUNGSTEN DEPOSITS IN JIANGXI
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摘要: 以江西大量的钨矿床勘查研究资料成果为基础, 以张天堂—西华山钨矿带为典型, 建立了钨矿床"多位一体"模式。该模式的核心是以成矿花岗岩为主因, 由不同类型的钨矿床组成的具有成生联系的构造—岩浆—成矿体系。重点展示了脉状钨矿床的四维结构与定位规律以及多样的矿床垂直分带模式。同时通过对脉状钨矿床形成的热动力过程观察研究, 揭示了区域水平挤压扭动与诱发的局部垂直内应力场交替活动、岩石剪切破裂与扩容充填交替进行的整个成矿过程, 及其对钨矿床结构形式与时空分布规律的约束作用。Abstract: Taking the Zhangtiantang-Xihuashan tungsten band as an example, this paper proposes a "multi-position in one" mode for tungsten deposits based on lots of explorations for tungsten deposits in Jiangxi.The core of the mode is the structure-magma-metallogenic series with genetic relation, composed of different kinds of tungsten deposits and with metallogenetic granite as its main factor.It focuses on displaying the four-dimensional structure of vein-type tungsten deposits and rules on orientation as well as various modes of vertical zoning in deposits.Meanwhile, based on obserbation of the thermodynamic process of vein-type tungsten deposits, this mode reveals the alternation of zone-level extrusion and twist with induced part-vertical inner stress field, and cutting and fracture of rocks with their expanding and recharging.It also shows constraint of the process on the whole structure of tungsten deposits and their temporal and spatial distribution.
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图 1 与花岗岩有关的“多位一体”钨矿床模式图
1.浅海相沉积盖层; 2.浅变质褶皱基底; 3.燕山期早期花岗岩; 4.燕山期晚期花岗岩; 5.石英脉型钨矿床; 6.云英岩型钨矿床; 7.钠化岩体型钨铌钽矿床; 8.断裂破碎带型钨矿体; 9.似层状矽卡岩型钨矿床; 10.层控破碎带型钨矿床; 11.接触交代矽卡岩型钨矿床。热蚀变带:a角岩带; b斑点板(千枚)岩带。多层楼式分带:◎脉芒带; ①线脉带; ②细脉带; ③薄脉带; ④大脉带; ⑤根部带。成矿环境:A内接触带型矿床; B内外接触带型矿床; C外接触带型矿床。多台阶钨矿床:Ⅰ第一台阶; Ⅱ第二台阶; Ⅲ第三台阶; D “地下室”式矿体; Lu “楼下楼”式矿体
Figure 1. Drawing for "multi-position in one" mode relating to granite
图 2 张天堂—西华山岩浆岩—构造—钨矿带简图
1.古近系; 2.中泥盆统—下三叠统; 3.南华系—奥陶系; 4.晚侏罗世花岗岩; 5.早白垩世花岗岩; 6.钻孔揭露的隐伏花岗岩钟; 7.推测的隐伏花岗岩基等深线; 8.花岗岩墙; 9.正断层; 10.逆断层; 11.挤压—走滑断层; 12.大型石英脉型钨矿床; 13.中型石英脉型钨矿床; 14.小型石英脉型钨矿床; 15.中型矽卡岩型钨矿床
Figure 2. A sketch of magmatite-structure-tungsten band along Zhangtiantang-Xihuashan
图 3 张天堂—西华山岩浆岩带控矿示意图
1.南华系—奥陶系; 2.燕山早期黑云母花岗岩; 3.断层; 4.矿区(点); 5.石英大脉型矿床; 6.石英细脉带型矿床; 7.破碎蚀变带型矿体; 8.云英岩型矿体; 9.隐伏岩体上的矿化标志带与缺位预测矿段
Figure 3. A sketch of ore-controlling of magmatitie band along Xihuashan-Zhangtiantang
图 4 燕山早期第二阶段岩体与燕山早期第一阶段岩体侵入关系及两层矿化特征
1.采空区; 2.矿脉及编号; 3.中粒黑云母花岗岩(γ52-2a); 4.细粒黑云母花岗岩(γ52-2b); 5.斑状中粒黑云母花岗岩(γ52-1); 6.穿沿脉坑道
Figure 4. A sketch showing the invasion relation and two-story mineralizations between the first-stage and second-stage rock masses in earlier Yanshanian
图 5 岿美山钨矿两期成矿及脉组排列示意图
1.寒武系; 2.燕山期白云母花岗岩; 3.闪长岩脉; 4.石英钨矿脉; 5.成矿期次分界线; 6.第一成矿期; 7.第二成矿期
Figure 5. A sketch of the two-period mineralizations and array of vein groups in Guimeishan Tungsten Mine
图 6 NEE向剪张裂隙与矿脉综合特征图
1.右型侧列剪张裂隙; 2.右型侧列剪张裂隙组; 3.羽裂; 4.石英钨矿脉右型侧列追张样式; 5.梳状产出与斜列产出的黑钨矿
Figure 6. A sketch of NEE-trending shrink fractures and tensile fractures and vein
图 7 NWW向张剪裂隙与矿脉综合特征图
1.平列式裂隙带; 2.羽裂; 3~4.石英钨矿脉左型侧列与追踪样式; 5.梳状产出与斜列产出的黑钨矿
Figure 7. A sketch of NWW-trending tensile fractures and shrink fractures and vein
图 8 大吉山钨矿平面图
1.泥盆系中下统; 2.寒武系上统; 3. 69岩体; 4.闪长斑岩脉; 5.石英斑岩脉; 6.细粒花岗岩脉
Figure 8. Plan of Dajishan Tungsten Mine
图 9 黄沙钨矿床地质剖面示意图(据江西有色地质局、赣南地质调查大队资料编)
1.二云母花岗岩; 2.电气石化花岗岩; 3.钠长石化花岗岩; 4.云英岩及云英岩化花岗岩(矿体); 5.矿化带与编号; 6.中段及编号
Figure 9. Cross section of Huangsha tungsten deposits
图 10 丰城市徐山钨铜矿床0线剖面图(据江西冶金地勘局、赣西地质调查大队资料编)
Nh南华系杨家桥群, Nht南华系潭头群, γπ燕山期花岗斑岩, Qw石英脉型钨矿体, W为云英矽卡岩化钨矿体, Cu、W为云英岩化矽卡岩化铜钨矿体, Sk为云英岩矽卡岩化
Figure 10. Zero-line section plan of Xushan tungsten and copper deposits in Fengcheng City
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