40Ar-39Ar age of the late stage veins in central Zhuguangshan pluton of South China and its relationship with uranium metallogenesis
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摘要:
诸广山岩体中段鹿井地区矿床周边常有花岗斑岩脉及煌斑岩脉等晚期岩脉产出。钾长石40Ar-39Ar同位素年代学测试结果表明，花岗斑岩脉与煌斑岩脉侵位年龄分别为116.24±0.49 Ma和128.27±0.86 Ma，是早白垩世地壳伸展的岩浆响应。岩脉记录的岩浆活动时代与鹿井矿田铀成矿作用时代具有较好的对应关系。花岗斑岩脉与铀矿石均具有幔源特征，表明以花岗斑岩为代表的酸性岩浆在为铀矿化提供热源的同时可能还提供了部分成矿物质。在铀成矿作用过程中，以煌斑岩为代表的基性岩浆为铀成矿作用提供了热源、矿化剂、流体及动力条件等有利条件。
Abstract:Late stage dykes like granite porphyry and lamprophyre veins are common around the ore deposits in Lujing area, the central section of Zhuguangshan pluton.K-feldspar 40Ar-39Ar isotope geochronologic analysis indicates that the granite porphyry vein was formed at 116.24±0.49 Ma while the lamprophyre vein intruded at 128.27±0.86 Ma, indicating that their intrusion corresponded to crustal extension magmatism during the Early Cretaceous.The magmatic chronologies recorded by the dykes are consistent with the uranium mineralization age of the Lujing orefield.Both the granite porphyry vein and the uranium ore present the characteristics of mantle source, indicating that the acidic magma source of the former one might have provided not only metallogenic materials but also heat source for uranium mineralization.During the process of uranium mineralization, the basic magma source of the lamprophyre provided favorable conditions such as heat generation, mineralizer, fluid and dynamic conditions for uranium mineralization.
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Key words:
- 40Ar-39Ar age /
- uranium metallogenesis /
- Lujing area /
- granite porphyry vein /
- lamprophyre vein /
- South China
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图 图版Ⅰ a.花岗斑岩手标本；b.花岗斑岩显微照片；c.煌斑岩中的自形角闪石；d.煌斑岩中的黑云母斑晶；e、f.煌斑岩显微照片。Hb—角闪石；Bi—黑云母；Kfs—碱性长石；Pl—斜长石；Qtz—石英
表 1 钾长石40Ar-39Ar测年结果
Table 1. 40Ar-39Ar age of selected K-feldspar from the late stage veins
T/℃ 40Ar/39Ar 38Ar/39Ar 37Ar/39Ar 36Ar/39Ar 40Ar*/39Ar 39Ar/10-10moles 年龄/Ma 年龄误差/Ma 39Ar累积/% 40Ar*/% J=0.004620花岗斑岩脉(LYP-71) 950 14.53 0.035 0.518 0.017 9.541 8.64 77.78 6.04 1.10 65.66 1000 16.22 0.025 0.205 0.006 14.374 11.10 115.95 4.50 2.51 88.62 1050 18.19 0.016 -0.003 0.013 14.393 65.70 116.10 2.80 10.85 79.13 1100 16.99 0.015 -0.076 0.006 15.275 28.10 122.97 1.16 14.41 89.90 1150 17.14 0.015 0.038 0.009 14.593 39.20 117.66 2.00 19.39 85.16 1200 17.22 0.016 0.026 0.010 14.111 49.30 113.89 2.25 25.65 81.96 1250 17.08 0.014 0.047 0.009 14.362 41.50 115.85 2.41 30.92 84.10 1300 17.17 0.009 0.089 0.009 14.418 33.00 116.29 1.49 35.11 83.94 1350 17.47 0.012 0.010 0.011 14.107 51.60 115.86 1.25 41.66 80.77 1400 17.40 0.003 -0.009 0.010 14.385 109.00 116.03 1.27 55.49 82.67 1450 17.33 0.014 0.014 0.010 14.381 228.00 116.00 0.95 84.44 82.96 1480 17.56 0.015 -0.004 0.010 14.666 104.00 117.23 1.16 97.64 83.50 1510 17.49 0.013 0.132 0.010 14.571 12.20 117.49 4.32 99.19 83.33 1550 17.99 0.015 0.439 0.016 13.346 6.41 107.90 2.86 100.00 74.17 J=0.004618煌斑岩脉(LYP-40-1) 1100 17.03 0.003 0.069 0.003 16.131 62.00 129.67 0.96 42.68 94.74 1150 17.15 0.026 0.330 0.005 15.776 21.80 126.92 1.35 53.34 91.97 1200 17.51 0.021 0.189 0.006 15.753 15.60 126.74 1.35 60.97 89.97 1250 18.17 0.002 0.254 0.007 16.201 14.60 130.22 4.27 68.10 89.20 1300 18.27 0.019 0.194 0.004 16.972 23.50 136.18 1.09 79.59 92.88 1350 18.28 -0.016 -0.052 0.002 17.543 28.80 140.60 1.28 93.67 95.95 1400 19.18 0.021 0.404 0.005 17.666 10.70 141.54 1.21 98.90 92.09 1450 24.19 -0.019 2.843 0.018 19.091 2.24 152.49 25.14 100.00 78.76 
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