Cassiterite U-Pb Dating with LA-MC-ICP-MS of the Laozhailing Cu-Sn Deposit, Yongzhou City, Hunan Province
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摘要:
锡石是锡多金属矿床中重要的矿石矿物，采用锡石对锡多金属矿床进行定年，已成为获得矿床成矿年龄最直接的方法。但由于锡石具有U含量较低、普通铅高的特点，目前锡石微区原位U-Pb定年方法的技术难点在于理想标样的研制和普通铅的准确扣除。本文通过优化该技术，对湖南省永州市老寨岭铜锡矿床的成矿时代进行约束。老寨岭铜锡矿床是以脉型为主的锡多金属矿床，矿体产出于印支晚期阳明山复式岩体的接触带上，主要由含锡石英脉、碎裂化云英岩化花岗岩及云英岩组成。利用LA-MC-ICP-MS微区原位U-Pb同位素测年技术，对老寨岭铜锡矿床中锡石进行研究，获得16LZ01、16LZ02、16LZ03等三件样品的Tera-Wasserburg U-Pb下交点年龄分别为222.0±1.5Ma(MSWD=1.6，n=37)、220.5±3.5Ma(MSWD=2.9，n=28)、225.0±1.6Ma(MSWD=1.3，n=31)。结合矿床地质特征和前人成岩-成矿年代学成果，研究表明老寨岭铜锡矿床成矿作用主要发生在印支晚期，与阳明山复式花岗岩体的岩浆热液活动关系密切。本文研究结果为老寨岭铜锡矿的岩浆热液成因提供了重要的年代学证据。
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关键词:
- 铜锡矿床 /
- 锡石U-Pb定年 /
- LA-MC-ICP-MS /
- 老寨岭 /
- 湖南
Abstract:Cassiterite is an important ore mineral in tin polymetallic deposits. Using cassiterite for dating tin polymetallic deposits has become one of the most direct methods to obtain the mineralization age of the deposits. However, due to the low uranium content and high common lead characteristics of cassiterite, the main problems and technical difficulties of the in situ U-Pb dating method for cassiterite lie in the development of ideal standards and the accuracy of common lead correction. The mineralization age of the Laozhailing Cu-Sn deposit in Yongzhou City, Hunan Province is constrained here by optimizing the technology. The Laozhailing Cu-Sn deposit is a vein-type tin polymetallic deposit, which is mainly composed of tin-quartz veins, cataclastic greisenized granite, and greisen. Three samples, 16LZ01, 16LZ02, and 16LZ03, were obtained with Tera-Wasserburg U-Pb lower intersection ages of 222.0±1.5Ma (MSWD=1.6, n=37), 220.5±3.5Ma (MSWD=2.9, n=28), and 225.0±1.6Ma (MSWD=1.3, n=31), respectively. These results indicate mineralization in the late Indosinian period. The mineralization of the Laozhailing Cu-Sn deposit is closely related to the magmatic hydrothermal activity of the Yangmingshan complex granites. The results of this study provide important chronological evidence for the magmatic hydrothermal origin of the Laozhailing Cu-Sn deposit.
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Key words:
- Cu-Sn deposit /
- cassiterite U-Pb dating /
- LA-MC-ICP-MS /
- Laozhailing /
- Hunan
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表 1 LA-MC-ICP-MS锡石U-Pb定年仪器工作条件
Table 1. Operating conditions of LA-MC-ICP-MS for cassiterite U-Pb dating
激光剥蚀系统
(New Wave 193)多接收电感耦合等离子体质谱
(Neptune)激光波长 193 nm 射频功率 1250W 能量密度 10～13J/cm2 冷却气(Ar)流速 16.00L/min 束斑直径 75μm 辅助气(Ar)流速 0.31L/min 剥蚀频率 8～10Hz 载气(Ar)流速 1.174L/min 剥蚀时间 30s 载气(He)流速 0.83L/min 脉冲宽度 5ns N2增敏 4mL/min 
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表 2 老寨岭铜锡矿床锡石LA-MC-ICP-MS U-Pb同位素测年结果
Table 2. LA-MC-ICP-MS U-Pb dating results of cassiterite from the Laozhailing copper tin deposit
样品16LZ01 样品16LZ02 点号 238U/206Pb 相对误差
(%)207Pb/206Pb 相对误差
(%)点号 238U/206Pb 相对误差
(%)207Pb/206Pb 相对误差
(%)1 14.61 1.46 0.4639 2.05 14 26.90 1.68 0.1444 8.74 3 24.27 1.14 0.1861 3.11 20 21.89 1.43 0.2299 2.99 4 25.68 0.98 0.1336 2.03 21 22.38 1.50 0.1878 4.75 5 19.94 1.01 0.2969 1.33 23 20.24 1.28 0.3109 2.32 6 24.77 0.97 0.1574 1.67 24 27.01 1.11 0.1086 4.76 7 13.69 1.01 0.4711 1.18 25 23.28 1.28 0.1818 4.00 8 18.28 1.25 0.3300 1.92 27 17.79 1.32 0.3424 2.02 11 10.11 1.42 0.5670 1.29 28 11.24 1.46 0.5527 1.77 13 26.88 1.18 0.1075 6.08 29 12.01 1.70 0.4874 2.13 14 27.36 1.07 0.0709 5.70 31 21.51 1.42 0.2427 3.56 15 27.53 1.08 0.0919 5.84 32 21.78 1.14 0.2453 2.28 16 23.68 1.11 0.1630 3.62 33 27.24 1.19 0.0966 7.19 17 24.61 1.14 0.1567 3.75 34 8.53 1.33 0.5946 1.23 18 19.59 1.02 0.2991 1.40 35 25.53 1.63 0.1628 7.93 19 23.05 0.95 0.2066 1.29 36 25.69 1.40 0.1392 5.58 21 14.85 1.04 0.4391 1.41 37 25.47 1.40 0.1757 4.82 22 26.94 1.24 0.1324 5.49 39 26.73 1.14 0.0928 5.70 23 22.01 1.34 0.2452 3.43 样品16LZ03 25 27.15 0.95 0.0824 2.15 点号 238U/206Pb 相对误差
(%)207Pb/206Pb 相对误差
(%)26 8.89 0.99 0.6127 1.12 2 28.04 1.03 0.0550 7.78 28 11.85 1.02 0.5214 1.17 3 26.82 1.00 0.0846 4.12 30 18.30 1.46 0.3569 2.80 4 27.62 1.06 0.0618 7.30 31 6.19 1.05 0.7026 1.25 6 20.64 1.13 0.2722 2.12 33 9.21 1.26 0.5908 1.30 10 26.84 1.75 0.0734 19.59 34 6.95 1.03 0.6667 1.12 11 21.13 1.13 0.2659 2.15 35 6.49 1.10 0.6797 1.12 12 26.94 1.16 0.0673 10.61 36 27.49 0.98 0.0733 3.81 13 28.27 1.17 0.0658 9.68 37 17.45 1.68 0.3483 2.29 14 27.04 1.19 0.0621 11.64 38 12.12 0.95 0.5167 1.13 15 26.81 1.10 0.0940 5.18 39 10.51 1.02 0.5554 1.18 16 27.76 1.06 0.0694 5.95 40 27.45 0.97 0.0795 3.30 19 26.97 1.02 0.0873 4.37 41 14.04 1.00 0.4475 1.22 20 27.68 1.03 0.0558 7.22 44 28.18 0.96 0.0532 3.75 21 26.52 1.06 0.1122 3.97 45 28.24 0.96 0.0629 3.18 22 26.72 1.73 0.0853 12.89 46 28.57 0.95 0.0594 3.37 24 20.91 1.42 0.2838 3.26 47 28.73 0.97 0.0675 3.89 27 11.20 1.09 0.5236 1.21 48 23.75 1.13 0.1745 3.00 28 16.10 0.96 0.3992 1.18 样品16LZ02 29 17.68 1.01 0.3546 1.31 点号 238U/206Pb 相对误差
(%)207Pb/206Pb 相对误差
(%)30 12.14 1.92 0.4923 1.81 1 23.69 1.57 0.1971 4.63 32 11.41 1.71 0.5392 2.04 2 22.94 1.75 0.2425 5.39 35 20.23 1.09 0.2744 2.29 3 26.44 1.15 0.0983 4.66 37 6.59 1.50 0.6880 1.24 4 12.24 1.37 0.5146 1.38 38 12.71 1.01 0.5104 1.32 5 16.29 1.75 0.3750 4.02 39 11.57 1.05 0.5372 1.26 6 21.99 1.32 0.1977 4.05 42 6.28 1.18 0.6895 1.14 9 25.72 1.92 0.1617 7.71 43 12.81 1.01 0.5093 1.23 10 26.57 1.33 0.1231 6.72 44 26.55 1.11 0.0950 5.47 11 26.86 1.45 0.1116 8.63 45 26.91 1.09 0.0890 5.92 12 25.24 1.50 0.1156 7.27 46 9.56 1.49 0.5940 1.40 13 19.38 2.32 0.3257 6.37 47 24.84 1.09 0.1566 3.47
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表 3 正式发表的潜在的微区原位锡石U-Pb定年标样
Table 3. The published potential standards of in situ cassiterite U-Pb dating
样品 U含量
(×10−6)U-Pb年龄
(Ma)测试方法 储量 参考文献 AY-4 30～33 158.2±0.4 ID-TIMS 多 ［4］ — 159.9±1.9 LA-ICP-MS Yankee 6～12 246.48±0.51 ID-TIMS 有限 ［22］ — 243.9±4.8 SIMS Euriowie — 1588±42 SIMS 有限 ［22］ SPG4 4.5～26.5 1536.6±1.0 ID-TIMS 有限 ［22］ — 1542.7±1.7 LA-ICP-MS ［23］ Cornwall 0.5～9.4 285.14±0.25 ID-TIMS 有限 ［28］ — 283.2±1.8 LA-ICP-MS ［23］ Jian-1 1.3～11.9 154.969±0.082 ID-TIMS 有限 ［28］ — 156.81±0.36 LA-ICP-MS ［23］ SPGⅡ 23～29 1539.5±0.5 ID-TIMS 有限 ［29］ RG-114 1.2～1.5 1022±3 ID-TIMS 有限 ［26］ BB#7 6.2～9.6 262.2±0.8 ID-TIMS 有限 ［26］ 19GX 7.6～13 100.0±0.3 ID-TIMS 有限 ［26］ 注: 表中“—”代表暂无数据。
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表 4 阳明山岩体锡多金属矿床成岩成矿年龄
Table 4. Isotope ages for tin polymetallic deposits of Yangmingshan granitic pluton
年龄 测试对象 矿物 测试方法 年龄(Ma) 参考文献 成岩年龄 阳明山岩体二云母二长花岗岩 锆石 LA-ICP-MS 218.0±10.0 ［32］ 阳明山岩体电气石白云母花岗岩 锆石 LA-ICP-MS 218.9±3.4 ［32］ 白果市土坳黑(白)云母二长花岗岩 锆石 LA-ICP-MS 228.6±1.4 ［33］ 白果市土坳黑(白)云母二长花岗岩 锆石 LA-ICP-MS 205±1.8 ［33］ 阳明山二云母二长花岗岩 锆石 LA-ICP-MS 229.0±2.0 ［33］ 阳明山二云母二长花岗岩 锆石 LA-ICP-MS 221.8±1.3 ［33］ 大江背电气石白云母二长花岗岩 锆石 LA-ICP-MS 218.2±2.0 ［33］ 大源里黑云母正长花岗岩 锆石 LA-ICP-MS 217.8±1.6 ［33］ 塔山岩体中细粒二长花岗岩 锆石 LA-ICP-MS 221.5±1.9 ［34］ 阳明山中细粒斑状二长花岗岩 锆石 LA-ICP-MS 213.7±1.0 ［34］ 塔山岩体花岗岩 锆石 LA-ICP-MS 247.2±5.9 ［35］ 塔山黑云母二长花岗岩 锆石 SHRIMP 218±3 ［36］ 板角沅中粗粒斑状电气石黑云母二长花岗岩 锆石 LA-ICP-MS 226.9±1.6 ［11］ 板角沅中粗粒斑状电气石黑云母二长花岗岩 锆石 LA-ICP-MS 223.8±1.9 ［11］ 板角沅细粒电气石白云母二长花岗岩 锆石 LA-ICP-MS 224.3±1.0 ［11］ 成矿年龄 板角沅锡矿脉 锡石 LA-MC-ICP-MS 216.7±2.4 ［11］ 老寨岭铜锡矿脉 锡石 LA-MC-ICP-MS 222.0±1.5 本文研究 老寨岭铜锡矿脉 锡石 LA-MC-ICP-MS 220.5±3.5 本文研究 老寨岭铜锡矿脉 锡石 LA-MC-ICP-MS 225.0±1.6 本文研究
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