Genesis of the Naneng gold deposit in southeastern Yunnan: Evidence from in-situ trace elements and isotopes of sulfides
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摘要:
那能金矿床是滇东南地区一个重要的中型卡林型金矿,研究其矿床成因对在滇东南地区寻找此类金矿床具有重要意义。在详细的野外调研和室内观察中发现那能金矿发育两个世代黄铁矿(PyI和PyII),利用LA-ICP-MS技术对载金矿物黄铁矿和毒砂进行了原位微量元素和硫同位素分析,探讨了成矿物质来源和矿床成因。LA-ICP-MS分析结果显示PyI含有一定量的Au(均值6.37×10−6),主要富集Co、Ni、Se、W等元素;与PyI相比,PyII微量元素分布特征相似,但Au质量分数(均值68.02×10−6)偏高,相对富集Au、As、Sb、Cu等元素;毒砂中Au质量分数均值为36.02×10−6,主要富集As、Ni、Sb、Se、Au等元素,Zn、Ag、Hg、Tl元素含量较低。载金矿物
δ 34S值分布范围较为一致,主要集中在13.7‰~16.5‰,暗示载金矿物的S可能主要来自于围岩地层。初步认为在那能金矿形成过程中,富含Au、As、Sb等微量元素的中低温热液流体,在相对稳定的环境中形成PyI黄铁矿,少量Au以固溶体(Au+)形式与PyI同时沉淀,在PyII阶段,区内强烈的构造活动使得成矿流体上涌,与围岩地层发生硫化反应后,流体中H2S浓度降低,Au-HS络合物失稳,Au过饱和沉淀后以纳米级包裹体(Au0)形式在PyII黄铁矿中大量富集。Abstract:Objective The Naneng gold deposit is an important medium-sized Carlin type gold deposit in southeastern Yunnan, and studying its genesis is of great significance for searching for such gold deposits in southeastern Yunnan.
Methods Two generations of pyrite (PyI and PyII) were found to develop in the Naneng gold deposit during detailed field survey and indoor observation, and trace elements and sulfur isotopes of gold-bearing minerals are analyzed by LA-ICP-MS to constrain the source of ore-forming materials and ore genesis.
Results LA-ICP-MS analyses show that PyI contains a small amount of Au (mean 6.37×10−6), which is relatively enriched in elements such as Co, Ni, Se, W; The distribution characteristics of trace elements in PyII and PyI are similar, but the content of Au (mean 68.02×10−6) is relatively high, and As, Sb, Cu elements are enriched in PyII; The average Au content of arsenopyrite is 36.02×10−6, and arsenopyrite is mainly enriched in elements such as As、Ni、Sb、Se、Au, while Zn, Ag, Hg and Tl elements are low. In addition, gold-bearing minerals in the Naneng gold deposit have consistent in situ
δ 34S values, ranging from 13.7‰ to 16.5‰, indicating that the S of gold-bearing minerals mainly come from the surrounding rocks.Conclusion It is preliminarily concluded that PyI was formed in a relatively stable environment by medium to low temperature hydrothermal fluid from the same source rich in trace elements such as Au、As、Sb, and a small amount of Au precipitated simultaneously with PyI in the form of solid solution (Au+). In the PyII stage, the intense tectonic activity in the area caused ore-forming fluid to upswell, and after sulfidation reaction with surrounding rock strata, the concentration of H2S in the fluid decreased, Au-HS complex became unstable, and Au supersaturated precipitation was enriched in PyII in the form of nanoscale inclusions (Au0).
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Key words:
- gold-bearing mineral /
- LA-ICP-MS /
- in situ sulfur isotope /
- ore genesis /
- Naneng gold
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表 1 那能金矿床载金矿物LA-ICP-MS 微量元素分析结果
Table 1. LA-ICP-MS trace element analysis results of gold-bearing mineral in Naneng gold deposit
点号 矿物 Fe S Co Ni Cu Zn As Se Ag Sn Sb W Au Hg Tl Pb Bi NN01-1-1 PyI 452352 516974 0.66 1.57 10.78 0.00 14668 1.78 0.01 0.18 18.32 1.57 4.43 0.26 0.70 6.21 0.45 NN01-1-2 437831 500378 40.20 285.82 54.16 0.00 28345 1.18 0.06 0.06 4.89 0.26 14.27 0.07 0.00 4.84 0.43 NN01-1-3 453960 518812 3.80 7.71 6.03 1.96 14800 1.48 0.00 0.02 2.36 0.77 4.02 0.06 0.01 1.62 0.08 NN01-1-4 457154 522461 0.85 3.71 6.35 0.58 10291 3.05 0.01 0.36 10.88 7.33 3.29 0.10 0.01 4.46 0.20 NN01-4-1 465036 531470 22.61 26.21 16.41 0.76 11014 3.09 0.01 0.00 0.88 0.26 2.02 0.04 0.00 0.68 0.04 NN01-4-2 438836 501526 54.46 78.42 13.24 0.20 26739 0.00 0.00 0.33 7.23 3.77 10.53 0.00 0.01 5.08 0.47 NN01-2-1 445704 509376 9.91 20.33 5.81 0.55 18089 2.29 0.11 0.00 48.35 0.70 4.24 0.13 0.04 55.66 1.36 NN01-2-2 424530 485178 204.96 375.30 15.42 0.39 29374 2.68 0.00 0.16 17.35 4.33 13.78 0.00 0.01 13.49 1.76 NN01-2-3 428482 489694 70.93 191.76 7.43 0.47 23041 0.00 0.06 0.11 25.07 2.77 3.67 0.05 0.01 23.50 2.74 NN01-2-4 446820 510651 4.46 23.07 10.18 0.29 20612 8.60 0.01 0.25 4.61 2.60 3.45 0.05 0.01 3.57 0.41 平均值 445070 508652 41.29 101.39 14.58 0.52 19697 2.41 0.03 0.15 13.99 2.44 6.37 0.07 0.08 11.91 0.79 NN01-1-5 PyII 435574 497800 0.05 0.42 80.24 0.29 37430 0.00 0.00 0.00 0.03 0.00 103.59 0.04 0.00 0.01 0.00 NN01-1-6 419809 479781 0.37 6.88 76.51 0.41 42446 1.97 0.01 0.05 0.07 0.00 121.72 0.03 0.02 0.36 0.01 NN01-5-3 426610 487554 0.03 0.61 50.98 0.53 30805 0.16 0.02 0.00 5.44 0.00 53.80 0.11 0.08 2.67 0.63 NN01-5-4 412026 470887 0.32 4.44 40.75 0.55 36272 0.99 0.30 0.00 68.19 0.00 54.46 0.10 0.05 66.16 1.77 NN01-5-5 401748 459140 0.72 10.50 64.70 0.56 39901 0.57 0.01 0.06 0.11 0.00 74.63 0.03 0.00 0.05 0.00 NN01-3-4 413568 472649 193.44 482.13 292.36 4.73 32930 0.76 0.11 1.70 65.20 8.15 26.62 0.24 0.12 36.52 3.25 NN01-3-5 405897 463883 6.84 32.09 73.71 0.55 52533 0.00 0.01 0.25 17.22 2.96 41.31 0.08 0.00 14.49 1.29 平均值 416462 475956 28.83 76.72 97.04 1.09 38902 0.64 0.07 0.30 22.32 1.59 68.02 0.09 0.04 17.18 0.99 NN01-3-1 毒砂 322414 184236 5.07 30.44 6.37 0.00 417457 0.00 0.28 0.17 110.69 1.89 55.03 0.42 0.04 6.58 0.72 NN01-3-2 322840 184480 54.94 504.74 2.51 0.00 415697 13.27 0.03 0.00 106.42 0.54 53.87 0.35 0.00 1.88 0.69 NN01-3-3 321162 183521 13.89 56.13 1.78 0.00 419960 0.00 0.00 0.30 90.98 2.16 45.56 0.33 0.01 4.08 0.62 NN01-4-1 324695 185540 2.87 5.88 0.95 0.00 413464 1.42 0.00 0.14 83.93 0.07 23.39 0.15 0.01 1.14 0.22 NN01-4-2 323804 185031 39.35 298.57 5.10 0.00 413584 4.53 0.03 0.00 116.35 1.78 70.17 0.34 0.01 4.72 0.58 NN01-4-3 324423 185385 0.09 11.95 0.53 0.06 413218 21.16 0.01 0.00 71.89 0.03 31.16 0.01 0.02 0.10 0.03 NN01-5-1 324981 185703 19.50 5.34 1.00 0.11 405414 6.18 0.00 0.41 368.90 5.02 0.77 0.14 0.05 9.97 2.73 NN01-5-2 326103 186345 1.16 8.30 2.21 0.30 405725 6.05 0.00 0.37 83.34 4.82 8.20 0.13 0.02 1.76 0.26 平均值 323803 185030 17.11 115.17 2.56 0.06 413065 6.58 0.04 0.17 129.06 2.04 36.02 0.23 0.02 3.78 0.73 表 2 那能金矿载金矿物硫同位素组成
Table 2. Sulfur isotope composition of gold-bearing minerals in Naneng gold deposit
样品编号 矿物 δ(34S)/‰ 2a/‰ NN01 - 1 黄铁矿(PyI) 16.2 0.1 NN01 - 2 黄铁矿(PyI) 16.2 0.1 NN01 - 9 黄铁矿(PyI) 14.8 0.1 NN01 - 6 黄铁矿(PyII) 13.9 0.1 NN01 - 7 黄铁矿(PyII) 16.3 0.1 NN01 - 8 黄铁矿(PyII) 16.5 0.1 NN01 - 12 黄铁矿(PyII) 15.1 0.1 NN01 - 3 毒砂 13.9 0.1 NN01 - 4 毒砂 13.7 0.1 NN01 - 5 毒砂 15.8 0.1 NN01 - 10 毒砂 14.7 0.1 NN01 - 11 毒砂 15.8 0.1 -
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