Rb-Sr Dating of Sphalerites from Shizishan Pb-Zn Deposit in Huayuan Ore Concentration Area, Western Hunan, and Its Geological Significance
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摘要: 花垣矿集区位于扬子地块东南缘与雪峰(江南)造山带的过渡部位, 是湘西-鄂西成矿带的重要组成部分.狮子山铅锌矿床的发现是近年来湘西-鄂西成矿带矿地质勘查的重大进展之一, 该矿床位于矿集区中部, 主矿体呈层状、似层状展布, 与地层产状一致, 直接容矿围岩为下寒武统清虚洞组下段第三亚段藻灰岩, 矿体与围岩界线截然, 伴有方解石化等热液蚀变, 矿石矿物成分相对简单, 主要为闪锌矿, 少量方铅矿和黄铁矿.采用全溶方法和流体包裹体淋滤法对该矿床主成矿期的闪锌矿及其残渣进行Rb-Sr等时线法定年, 获得矿物相+残渣相的年龄为410±12 Ma(MSWD=2.20), 地质时代为早泥盆世, 明显晚于赋矿地层的时代.据此认为矿床的形成可能与加里东运动后构造伸展引起的盆地流体运移有关.该年龄对于整个花垣矿集区的铅锌成矿时代具有同样约束意义.闪锌矿+残渣的Sr初始值(87Sr/86Sr)i为0.709 16, 高于赋矿围岩, 与上覆寒武系白云岩地层的87Sr/86Sr值相近, 表明矿床形成时有来自上覆地层物质的加入.结果表明, 采用闪锌矿Rb-Sr等时线定年方法通过单矿物及其残渣相互约束, 可以有效确定成矿时代.Abstract: The Huayuan ore concentration area in the western Hunan Province, located in transitional zone between the southeastern margin of Yangtze block and the Xuefeng (Jiangnan) orogenic belt, is important section of the Xiangxi-Exi metallogenetic belt, and is the only one which occurs in limestone of Lower Cambrian strata in the Yangtze block. The Shizishan Pb-Zn deposit which was one of recently discovered Pb-Zn deposits in Xiangxi-Exi metallogenetic belt is located in the center of the Huayuan ore concentration area, and its main ore bodies occur in stratoid with the same trending as the strata and are sharply bounded by wall rocks with weak hydrothermal alteration such as calcitization. Ore bodies are strictly controlled by algal limestone of the third section of the lower member of the Lower Cambrian Qingxudong Formation. Ore minerals are mainly sphalerite, and a small amount of galena and pyrite, whereas gangue mineral is mainly calcite, and a small amount of barite and fluorite. Using the total-sample-dissolution method and leaching method to sphalerite in the Shizishan Pb-Zn deposit for Rb-Sr isochron dating. The isochron ages are obtained 410±12 Ma (MSWD=2.20) with initial 87Sr/86Sr value of 0.709 16 for mineral-phase+residue phase, which shows that the Early Devonian is the main time for the formation of the Shizishan Pb-Zn deposit. Research results indicate that the formation of the deposit is probably related to the regional migration of the basin fluid when the crust is stretched behind the Late Caledonian tectonic movement in Early Devonian, and the age is also a constraint on the Pb-Zn ore-forming time of the whole Huayuan ore concentration area. The initial 87Sr/86Sr value of the mineral phase+residue phase is 0.709 16, which is slightly higher than those of the ore-bearing limestone, and close to those of the overlying dolostone of Middle-Upper Cambrian strata, indicating that the ore-forming materials of the ore bodies in the Shizishan Pb-Zn deposit are possibly derived from the overlying dolostone strata. It is thus concluded that direct dating of the ages of metal minerals by using Rb-Sr isochron method for single minerals and mineral residues could serve as a routine dating method.
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图 1 花垣矿集区地质矿产简图(据湖南省地质调查院吉首矿产地质调查所，湖南龙山-保靖铅锌矿评价成果报告, 2009, 修编)
1.地层界线；2.断裂及编号；3.铅锌矿床；Nh1bx.南华系板溪群；Nh2d.南华系大塘坡组；Nh2n.南华系南沱组；Z.震旦系； ${\rm{\rlap{-} C}}$1n-s.下寒武统牛蹄塘组+石牌组； ${\rm{\rlap{-} C}}$1s.下寒武统石牌组； ${\rm{\rlap{-} C}}$1q.下寒武统清虚洞组； ${\rm{\rlap{-} C}}$2g/ ${\rm{\rlap{-} C}}$2a/ ${\rm{\rlap{-} C}}$2c.中寒武统高台组组/熬溪组/车夫组； ${\rm{\rlap{-} C}}$2-3l.中-上寒武统娄山关组；O.奥陶系；F1.张家界-花垣断裂；F2.麻栗场断裂；F3.松桃-水田断裂
Fig. 1. Sketch map of geology and minerals of the Huayuan ore concentration area in western Hunan Province
图 2 狮子山铅锌矿床地质图(据湖南省地质调查院吉首矿产地质调查所，湖南龙山-保靖铅锌矿评价成果报告, 2009, 修编)
1.铅锌矿体；2.见矿钻孔；3.岩层产状；4.正断层；5.逆断层；6.性质不明断层； ${\rm{\rlap{-} C}}$1q1-2.清虚洞组下段第二亚段； ${\rm{\rlap{-} C}}$1q1-3.清虚洞组下段第三亚段； ${\rm{\rlap{-} C}}$1q1-4.清虚洞组下段第四亚段； ${\rm{\rlap{-} C}}$1q2.清虚洞组上段； ${\rm{\rlap{-} C}}$2g.高台组； ${\rm{\rlap{-} C}}$2-3l.娄山关组；Q.第四系冲洪积物
Fig. 2. Geological map of the Shizishan Zn-Pb ore district
图 3 主成矿期矿石构造和闪锌矿显微照片
a.斑脉状构造，闪锌矿和白色粗晶方解石呈不规则斑块状、脉状分布于灰色藻灰岩中；b, c.细粒闪锌矿集合体，透射光；d.自形粒状闪锌矿，透射光；Lim.藻灰岩；Cal.方解石；Sp.闪锌矿；Py.黄铁矿
Fig. 3. Main-mineralization stage ore structure and photomicrographs of sphalerite
图 4 狮子山矿床闪锌矿全矿物相Rb-Sr同位素等时线
Fig. 4. Rb-Sr isochron of Mineral sphalerites from the Shizishan Pb-Zn deposit
图 5 狮子山矿床闪锌矿残渣Rb-Sr同位素等时线
Fig. 5. Rb-Sr isochron of sphalerite residues from the Shizishan Pb-Zn deposit
图 6 狮子山矿床闪锌矿矿物相和残渣相Rb-Sr同位素等时线
Fig. 6. Rb-Sr isochron of mineral sphalerites and its residues from the Shizishan Pb-Zn deposit
图 7 狮子山矿床闪锌矿及其残渣的1/Rb-87Rb/86Sr和1/Sr-87Sr/86Sr关系
Fig. 7. Diagrams of 1/Rb vs.87Rb/86Sr and 1/Sr vs.87Sr/86Sr of mineral sphalerites and its residues from the Shizishan Pb-Zn deposit
表 1 狮子山矿床闪锌矿Rb-Sr同位素分析结果
Table 1. Rb-Sr dating data for sphalerites from the Shizishan Pb-Zn deposit
样号 样品名称 Rb(10-6) Sr(10-6) 87Rb/86Sr 87Sr/86Sr 误差(±2σ) SZ-5 矿物相 0.394 2 8.868 0.128 2 0.709 87 0.000 10 SZ-6 0.341 5 26.400 0.037 3 0.709 33 0.000 09 SZ-7 0.084 4 26.590 0.009 2 0.709 15 0.000 04 SZ-8 0.358 5 14.640 0.070 6 0.709 54 0.000 02 SZ-9 0.260 7 7.324 0.102 6 0.709 70 0.000 12 SZ-12 0.131 7 8.331 0.045 6 0.709 42 0.000 03 SZ-13 0.261 8 10.280 0.073 4 0.709 55 0.000 10 SZ-5-1 0.508 7 10.080 0.145 5 0.709 96 0.000 30 SZ-5 残渣相 0.673 8 1.065 0 1.826 0 0.719 74 0.000 09 SZ-6 0.544 1 0.555 4 2.830 0 0.725 99 0.000 10 SZ-8 0.643 0 0.909 5 2.041 0 0.720 74 0.000 02 SZ-9 0.415 7 1.050 0 1.143 0 0.715 80 0.000 02 SZ-12 0.115 0 0.458 9 0.722 9 0.713 86 0.000 03 SZ-13 0.352 0 0.662 5 1.533 0 0.717 88 0.000 04 SZ-5 淋滤液 0.107 6 7.621 0.040 7 0.709 48 0.000 03 SZ-6 0.199 1 23.690 0.024 2 0.709 24 0.000 01 SZ-8 0.100 6 10.450 0.027 8 0.709 37 0.000 20 SZ-9 0.086 0 5.459 0.045 4 0.709 43 0.000 08 SZ-12 0.021 8 5.469 0.011 5 0.709 16 0.000 02 SZ-13 0.824 2 11.700 0.020 3 0.709 42 0.000 10 
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