| 柿竹园钨多金属矿床形成机制的物理化学分析 |
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| 引用本文： | 龚庆杰,於崇文,张荣华.柿竹园钨多金属矿床形成机制的物理化学分析[J].地学前缘,2004,11(4):617-625. |
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| 作者姓名： | 龚庆杰 於崇文 张荣华 |
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| 作者单位： | 中国地质大学,地球科学与资源学院,北京,100083;中国地质科学院,矿产资源研究所,北京,100037;中国地质大学,地球科学与资源学院,北京,100083;中国地质科学院,矿产资源研究所,北京,100037 |
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| 基金项目： | 国家自然科学基金资助项目 ( 4 0 2 0 3 0 0 6,40 2 3 40 48,
40 3 73 0 0 3 ) |
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| 摘 要： | 通过对柿竹园钨多金属矿床流体包裹体的研究发现 ,矿物流体包裹体的均一温度主要集中在2 0 0～ 330℃ ,而矿区大规模的成矿作用主要发生在 2 5 0～ 35 0℃ ,成矿流体的压力大约在 38～ 6 8MPa。依据 34MPa、w(NaCl) =4 .0 %溶液中WO3 的溶解度数据计算了化学反应WO3 (s) +NaCl +H2 O =NaH WO4+HCl在 2 5 0 ,30 0 ,35 0和 4 0 0℃的lgK分别为 - 4 .0 6、- 4 .0 5、- 3.83和 - 3.4 9,此条件下NaH WO4(aq) 的表观吉布斯自由能分别为 - 12 81.2 ,- 12 91.3,- 130 4 .1和 - 1319.7kJ/mol。由此热力学数据计算了白钨矿在该体系中的溶解度 ,结果发现白钨矿的溶解度较相同条件下WO3 的溶解度低 2个数量级以上。柿竹园超大型钨多金属矿床的形成具备有持续的“热源”、充沛的“水源”和丰富的“矿源” ,而且成矿流体对成矿物质具有超强的萃取和搬运能力。千里山花岗岩体的多次夕卡岩化和云英岩化围岩蚀变是成矿流体中钨产生有效富集的重要机制。
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| 关 键 词： | 柿竹园 钨矿床 流体包裹体 溶解度 成矿机制 |
| 文章编号： | 1005-2321(2004)04-0617-09 |
| 修稿时间： | 2004年5月25日 |
Physical chemistry study on the ore-forming process of Shizhuyuan tungsten-polymetallic deposit |
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| GONG Qing-jie.Physical chemistry study on the ore-forming process of Shizhuyuan tungsten-polymetallic deposit[J].Earth Science Frontiers,2004,11(4):617-625. |
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| Authors: | GONG Qing-jie |
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| Institution: | GONG Qing-jie~ |
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| Abstract: | Fluid inclusion study on the Shizhuyuan tungsten-polymetallic deposit indicates that the homogeneous temperatures of mineral fluid inclusions focus on the range of 200 to 330 ℃, while the temperatures during the main ore-forming process centralize on the range of 250 to 350 ℃, and the pressures of the ore-forming fluids range from 38 to 68 MPa. From the WO_3 solubility data in the 4.0% NaCl solution at 34 MPa, the logarithm of the equilibrium constant for WO_(3(s))+NaCl+H_2O=NaHWO_4+HCl is -4.06, -4.05, -3.83 and -3.49 at temperatures of 250, 300, 350 and 400 ℃ respectively, and the apparent Gibbs energy is -1 281.2, -1 291.3, -1 304.1 and -1 319.7 kJ/mol respectively. The Schellite solubility in the 4.0% NaCl solution calculated from thermodynamic data, shows these solubility values are lower up to two magnitude degrees than those of the WO_3 at the same conditions. During the ore-forming process of the Shizhuyuan tungsten-polymetallic deposit, there existed three adequate sources as follows: consistent thermal source, affluent water source and abundant ore-forming metal source; and further more, the ore-forming fluid was of the extra strong capacity to extract and transport the ore-forming metal elements. The multiple wall rock alterations of skarn and greisen of Qianlishan granite body played an important role in concentrating the ore-forming metal elements effectively. |
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| Keywords: | Shizhuyuan tungsten deposit fluid inclusion solubility ore-forming process |
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