H-O-S-Pb ISOTOPIC COMPONENTS OF THE LIANGSHAN MOLYBDENUM DEPOSIT IN XINYU, JIANGXI PROVINCE AND THEIR IMPLICATIONS FOR THE ORE FORMING PROCESS
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摘要: 在前人研究成果的基础上,对江西新余良山钼矿床的地质特征进行了详细研究,系统测试了矿床中石英脉型钼矿石样品的氢、氧、硫和铅同位素组成,进而探讨钼矿床的成矿流体性质以及成矿物质来源。良山钼矿床δD值变化范围-61‰~ -57.9‰,平均值-59.1‰;δ18OV-SMOW值变化于7.1‰~10.5‰,平均值9.2‰,流体的δ18OH2O值变化于-3.32‰~-0.52‰,平均值-1.52‰,表明成矿流体具有岩浆水和大气降水混合流体特征。硫化物的δ34SV-CDT值为-1.8‰~2.6‰,极差4.4‰,平均值1.12‰,其中黄铁矿δ34SV-CDT值为-1.8‰~2.6‰,辉钼矿δ34SV-CDT值为0.8‰~2.3‰,硫同位素表现为较小的正值特征,具有典型的岩浆硫组成特点。良山钼矿石中的矿石铅同位素206Pb/204Pb值为17.555~19.474,207Pb/204Pb值15.486~15.768,208Pb/204Pb值37.942~39.943,μ值9.35~9.7,ω值37.06~38.31,Th/U值3.8~3.96,矿石铅为混合铅,表明成矿物质为混合来源。良山钼矿床应为岩浆热液型-石英脉型钼矿床,是中生代华南板块板内构造演化区域金属成矿作用大爆发的产物。Abstract: On the basis of predecessors' research results, We study the geological characteristics of the Liangshan molybdenum deposit in Jiangxi province and test H-O-S-Pb isotopic components of the molybdenum stone samples in quartz vein systematically, and then discusse the metallogenic fluid properties as well as the source of ore-forming materials of the molybdenum deposit. The δD of the ore-forming fluids are between -61‰~-57.9‰, with the average of -59.1‰; and the δ18OV-SMOW of the ore-forming fluid are between 7.1‰~10.5‰, with the average of 9.2‰; and the δ18OH2O of the ore-foring fluids are between -3.32‰~-0.52‰, with the average of -1.52‰, which indicate that the ore-forming fluid has the characteristics of magmatic water and meteoric water mixed fluid. The δ34SV-CDT of the sulfide mineral are between -1.8‰~2.6‰, with the range of 4.4‰ and the average of 1.12‰, of which the δ34SV-CDT of the pyrite are between -1.8‰~2.6‰ and the δ34SV-CDT of the molybdenite are between 0.8‰~2.3‰. The sulfur isotope values are smaller positive which show the characteristics of typical magmatic sulfur. The values of 206Pb/204Pb of the ore samples are between 17.555~19.474, and the values of 207Pb/204Pb are between 15.486~ 15.768, as well as the values of 208Pb/204Pb are between 37.942~39.943, with the μ values of 9.35~9.7 and the ω values of 37.06~38.31, as well as the Th/U values of 3.8~3.96, which indicate the ore are rich in mixed lead, and the ore-forming material sources are mixed. The Liangshan molybdenum ore should belong to the magmatic hydrothermal type and quartz vein type deposit, which is a product of the metal mineralization outbreak during the intraplate tectonic evolution of south China plate in Mesozoic.
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图 1 江西新余铁矿田地质图(据文献[14]略改)
Figure 1. Geological map of the Xinyu iron deposit in Jiangxi Province
图 2 江西新余良山钼矿床地质简图(据文献[12]略改)
Figure 2. Geological map of the Liangshan molybdenum deposit in Xinyu, Jiangxi Province
图 4 新余良山钼矿δ18OH2O-δD同位素投影图(底图据文献[21])
Figure 4. The projection graph of δ18OH2O vs. δD of the Liangshan molybdenum deposit
图 5 良山钼矿床H-O同位素组成与天然H-O同位素对比图解(底图据文献[25])
Figure 5. Contrast of H-O isotopic compositions in Liangshan molybdenum deposit and in nature
图 7 新余良山钼矿矿床铅同位素207Pb/204Pb-206Pb/204Pb模式图(底图据文献[23])
A—地幔; B—造山带; C—上地壳; D—下地壳
Figure 7. The mode pattern of 207Pb/204Pb-206Pb/204Pb for the Liangshan molybdenum deposit in Xinyu, Jiangxi Province
表 1 江西新余良山钼矿矿床石英氢、氧同位素组成
Table 1. Hydrogen and oxygen isotopic compositions of the Liangshan molybdenum deposit in Xinyu, Jiangxi
样品号 矿物 检测结果 δDV-SMOW/‰ δ18OV-PDB/‰ δ18OV-SMOW/‰ δ18OH2O/‰ Th/℃ JX1-7 石英 -61.0 -19.8 10.5 -0.79 206.5 JX1-8 石英 -59.6 -21.1 9.2 -0.52 234.2 JX1-9 石英 -58.9 -21.5 8.8 -2.01 214.0 JX1-11 石英 -57.9 -23.0 7.1 -0.92 221.4 JX1-12 石英 -58.2 -20.8 9.5 -3.32 221.4 注:样品测试在核工业北京地质研究院分析测试研究中心完成 表 2 江西新余良山钼矿床硫同位素组成
Table 2. Sulfur isotopic composition of the Liangshan molybdenum deposit in Xinyu, Jiangxi Province
样品号 矿物 δ34SV-CDT/‰ JX1-7 黄铁矿 2.6 JX1-7-h 辉钼矿 2.0 JX1-8 辉钼矿 2.3 JX1-9 黄铁矿 1.2 JX1-10 辉钼矿 2.1 JX52-3 黄铁矿 1.9 JX52-4B 黄铁矿 0.8 JX52-4C 黄铁矿 -0.3 JX52-5B 黄铁矿 -1.8 JX52-6A 黄铁矿 1.8 JX52-6B 黄铁矿 -0.3 JX52-6B-h 辉钼矿 0.8 JX53-2A 黄铁矿 1.3 JX53-2C 黄铁矿 1.3 注:样品测试在核工业北京地质研究院分析测试研究中心完成 表 3 中文江西新余良山钼矿床铅同位素组成标题
Table 3. Lead isotopic composition of the Liangshan molybdenum deposit in Xinyu, Jiangxi Province
样品号 矿物 208Pb/204Pb 207Pb/204Pb 206Pb/204Pb t/Ma μ ω Th/U △α △β △γ JX52-3 黄铁矿 38.931 15.630 18.508 133 9.51 38.27 3.89 76.54 19.85 44.79 JX52-4B 黄铁矿 38.672 15.606 18.365 207 9.48 37.78 3.86 73.98 18.61 41.09 JX52-4C 黄铁矿 37.942 15.486 17.555 648 9.35 38.28 3.96 61.97 13.27 41.09 JX52-5B 黄铁矿 38.430 15.580 18.272 243 9.44 37.06 3.80 71.32 17.08 36.14 JX52-6A 黄铁矿 38.722 15.620 18.490 134 9.49 37.42 3.82 75.54 19.20 39.20 JX52-6B 黄铁矿 39.943 15.768 19.474 -399 9.70 38.31 3.82 122.10 28.32 65.98 JX52-6B-h 辉钼矿 38.503 15.574 18.257 246 9.43 37.39 3.84 70.72 16.70 38.26 JX53-2A 黄铁矿 38.200 15.548 17.945 441 9.42 37.66 3.87 67.94 16.01 38.71 JX53-2C 黄铁矿 38.149 15.532 17.913 444.6 9.39 37.47 3.86 66.37 14.99 37.51 注:样品测试在核工业北京地质研究院分析测试研究中心完成;μ=w(238U)/w(204Pb),ω=w(232Th)/w(204Pb);计算结果由Geokit软件计算所得;t为硫化物模式年龄 -
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