DYNAMIC FORMATION AND EVOLUTION OF ORE-CONTROLLING TECTONIC SYSTEMS IN SUICHANG SILVER GOLD OREFIELD, ZHEJIANG PROVINCE
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摘要: 矿田构造的解析是研究矿床成因、成矿规律及找矿预测的重要手段, 也是遂昌银-金矿田研究的一个较薄弱的环节.将地质力学的体系分析与板块理论相结合, 首先对矿田成矿地质特征作了简要描述, 提出矿田内存在早、晚两期矿化作用, 即: 吕梁期(Ag-Au) 和燕山期(Pb·Zn-FeS2, Au-Ag), 并在此基础上, 确立了矿田控矿构造体系为陡倾折面体系、格状叠改体系以及川字型断裂破矿体系.然后, 通过鉴定不同成矿期矿田所处板块环境, 确立了控制矿田的区域应力场, 进而分析了不同期控矿构造体系的板块驱动机制.Abstract: The analysis of orefield structure is not only an important method for the research into the genesis of mineral deposits, the mineralization patterns, and the prospecting forecasting, but also a relatively weak part of the research into the Suichang silver gold field. In this paper, by combining the system analysis of geology mechanics with the theories and methods for plate tectonics, the authors firstly present a brief description of the geological features of the orefield, and suggest two mineralization stages in the orefield: Luliang stage and Yanshan stage. Then, the authors present a specific description of the orebodies distribution patterns in the orefield, and classify the ore controlling tectonic systems as steeply tilted folding surface system, grating overprinting and remaking system and parallel fault damaged orebody system. Finally, by identifying the plate environments of the orefield in different mineralization stages, the authors determine the regional stress fields controlling the orefield and analyze the plate driven mechanism for ore controlling tectonic systems in different stages.
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图 1 遂昌矿田矿化地质关系剖面
a.杨梅岗矿床(东矿段) 470坑道: ①八都群剪切片麻岩; ②网脉硅化矿体; ③加里东期细粒石英闪长岩(杨梅岗岩体); ④黄铁矿-石英细脉; ①—④为地质切割关系序号.b.银坑山(中矿段) 380坑道: ①八都群(Pt1b) 混合岩化剪切带; ②剪切带中面状硅化银-金主矿体(较广泛地交代剪切片麻岩角砾呈环带状); ③揉皱状含银-金石英-黄铁矿条带脉; ④燕山早期超浅成中基性次火山岩(隐爆成因, 含硅化岩型银-金矿石角砾); ⑤平直的Pb·Zn-FeS2大脉; ①—⑤为地质切割关系序号
Fig. 1. Section sketch maps of mineralization geological relations in Suichang orefield
图 2 遂昌银-金矿田成矿体系平面图
a.遂昌矿田大地构造位置; b.控矿体系; c.控矿体系成生平面应力解析; d.预测矿段.1.八都群(Pt1b) 变质岩; 2.大爽组(J3d) 火山岩; 3.花岗斑岩; 4.霏细岩; 5.闪长玢岩; 6.煌斑岩; 7.华峰尖火山口; 8.Ag-Au矿体; 9.Ag-Au矿化体; 10.Pb·Zn-FeS2矿脉; 11.矿体编号; 12.断层
Fig. 2. Distribution of the metallogenic system on plane in Suichang silver-gold orefield
图 3 浙江吕梁期花岗岩的lgτ-lgσ图解
Fig. 3. The lgτ-lgσ map of Luliang period granite in Zhejiang Province
图 4 遂昌矿田片麻岩及金矿石的REE配分曲线
Fig. 4. Distribution model of REE of gneiss and gold ore in Suichang orefield
图 5 区域板块驱动矿田构造体系控矿的动力机制系列模式
1.岛弧火山岩; 2.板块边缘相对运动方向; 3.下元古界片麻岩地体剪切带; 4.剪切带中硅化岩型银-金矿体; 5.燕山期火山机体中的Pb·Zn-FeS2大脉; 6.燕山期花岗斑岩脉; 7.遂昌矿田所在板块位置
表 1 遂昌矿田矿化类型特征
Table 1. Mineralization characteristics in Suichang silver-gold orefield
表 2 遂昌矿田成矿期次及矿化阶段
Table 2. Mineralization periods and stages of Suichang orefield
表 3 浙江吕梁期花岗岩类岩石化学分析结果[13]
Table 3. Petrochemistry analysis results of Luliang period granite in Zhejiang Province
表 4 遂昌矿田片麻岩及金矿石稀土元素质量分数及稀土指数
Table 4. Contents of REE of gneiss and gold ore in Suichang orefield
表 5 遂昌矿田金银矿石铅同位素组成
Table 5. Lead isotopic compositions of gold-silver ore in Suichang orefield
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