Re-Os Isotopic Dating of Arsenopyrite from Auriferous Quartz Vein-type Gold Deposits in the Southwestern Margin of Jiangnan Orogen
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摘要: 江南造山带西南缘的贵州东南部地区石英脉型金矿产于低绿片岩相的板溪群浅变质岩中，具有典型的造山型金矿特征。与江南造山带其他造山型金矿一样，其成矿时代具有较大的争议，金矿的形成与造山运动的关系还不清楚，制约了对本区金矿成矿作用的深入研究。本文采集了平秋和八克两个石英脉型金矿中与金成矿作用密切相关的含金石英脉中毒砂样品进行高精度的Re-Os同位素分析，分别得到235±3.4 Ma和410±52 Ma两个Re-Os同位素等时线年龄，八克金矿毒砂样品的年龄误差较大的原因是毒砂中Re含量较低所致，但其中低含量高射性样品计算得到的Re-Os同位素模式年龄仍然与其等时线年龄一致。两个矿床的毒砂Re-Os同位素年龄揭示了江南造山带石英脉型金矿与加里东期和印支期两次陆内造山运动有关，是华南显生宙陆内造山运动的产物。Abstract: Quartz vein-type gold deposits of Southeastern Guizhou Province in the southwestern margin of Jiangnan Orogen, which are typical orogenic gold deposits, are hosted in Neoproterozoic Banxi Group sub-greenschist facies metamorphic rocks. However, similar to other gold deposits in Jiangnan Orogen, mineralization ages of these deposits is a controversial issue and its relationship with Indosinian and Caledonian intra-continental orogenies remains unresolved, which limits the further study of ore-forming mechanisms. In this study, highly precise Re-Os isotopic analyses for arsenopyrites from bedding-concordant veins in Pingqiu and Bake Deposits were performed, and the isochron Re-Os ages of 235±3.4 Ma and 410±52 Ma, respectively were obtained. Low Re in arsenopyrite samples is responsible for the large uncertainty of Bake Re-Os isochron age. Nonetheless, the lack of common Os in one arsenopyrite sample from the Bake permit calculation of a single mineral model age, which is consistent with those determined using the isochron method. The Re-Os ages of arsenopyrite indicate that there were two distinct periods of gold deposition in Jiangnan Orogen coinciding with Caledonian and Indo-Sinian intra-continental orogenies.
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Key words:
- Jiangnan Orogen /
- gold deposits /
- arsenopyrite /
- Re-Os isotope /
- Caledonian Epoch /
- Indo-Sinian Epoch
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图 2 (a)平秋金矿条带状石英脉(毒砂与其他硫化物在石英脉内呈条带状产出，记号笔长度16 cm)；(b)八克金矿M4号含金石英脉(毒砂分布于石英脉体靠近围岩一侧，地质锤长度28 cm)
Figure 2.
表 1 平秋金矿与八克金矿毒砂Re-Os同位素测试结果
Table 1. Re-Os isotopic data for arsenopyrite from Pingqiu and Bake gold deposits in Southeastern Guizhou Province
样品编号 Re含量(ng/g) 普Os含量(ng/g) 187Os含量(ng/g) 187Re/188Os 187Os/188Os 测定值 不确定度 测定值 不确定度 测定值 不确定度 测定值 不确定度 测定值 不确定度 PQ-1 10.65 0.11 0.0024 0.0001 0.0282 0.0002 21476 562 90.33 2.11 PQ-2 3.906 0.032 0.0025 0.0001 0.0114 0.0001 7534 390 35.07 1.80 PQ-3 14.50 0.13 0.0044 0.0001 0.0378 0.0003 16092 380 66.81 1.42 PQ-4 11.94 0.10 0.0041 0.0000 0.0318 0.0003 14152 183 59.94 0.47 PQ-5 1.292 0.012 0.0042 0.0001 0.0056 0.0001 1471 27 10.22 0.19 BK-1 1.4691 0.012 0.0025 0.0001 0.0063 0.000 2816 63 19.36 0.43 BK-2 1.1072 0.010 0.0048 0.0002 0.0048 0.000 1108 43 7.669 0.291 BK-3 0.8100 0.006 0.0070 0.0001 0.0048 0.000 562.1 10.4 5.250 0.082 BK-4 0.4268 0.003 0.0029 0.0000 0.0021 0.000 708.1 11.4 5.444 0.301 BK-5 1.4591 0.012 0.0005 0.0000 0.0066 0.000 13611 907 97.80 6.51 注：表中的代号PQ代表平秋金矿，BK代表八克金矿。 
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