| 梅贞华,华北,胡兆国,孙峰,张扬,杜利明.内蒙古达茂旗乌珠新乌苏铅多金属矿床成因初探[J].矿产勘查,2022,13(7):924-933 |
| 内蒙古达茂旗乌珠新乌苏铅多金属矿床成因初探 |
| Genesis of the Wuzhuxinwusu lead polymetallic deposit in Damao Banner, Inner Mongolia |
| 投稿时间：2021-07-25 |
| DOI：10.20008/j.kckc.202207006 |
| 中文关键词: 矿床成因 同位素 流体包裹体 乌珠新乌苏铅多金属矿 内蒙古 |
| 英文关键词: ore genesis isotope fluid inclusions Wuzhuxinwusu lead polymetallic ore Inner Mogolia |
| 基金项目:本文受中国冶金地质总局科研项目(CMGB202002)、中国冶金地质总局山东局科研项目联合资助。 |
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| 中文摘要: |
| 内蒙古达茂旗乌珠新乌苏铅多金属矿床地处兴蒙造山带西段,属白乃庙—哈达庙铜金萤石成矿带,为近年来新发现的大中型矿床。本文在前人成果的基础上,开展了流体包裹体显微测温及氢、氧、硫、铅同位素研究,探讨了矿床成矿物质与成矿流体来源、流体的特征与演化。研究发现成矿早阶段均一温度为247.3 ℃～345.0 ℃,盐度为1.4%～7.17% NaCleqv；主阶段均一温度为121.3 ℃～260.1 ℃,盐度为0.88%～11.22% NaCleqv；晚阶段均一温度为115.3 ℃～149.8 ℃,盐度为0.18%～6.16% NaCleqv,属中低温矿床；成矿流体的δDV-SMOW为-112.8‰～-95.1‰,δ18OH2O为-4.46‰～4.90‰,具有岩浆水与大气水混合的特征；矿石中δ34S值变化于-2.94‰～2.73‰,206Pb/204Pb、207Pb/204Pb和208Pb/204Pb比值分别为 18.1759～18.1790、15.5532～15.5555和38.0058～38.0115,显示了成矿物质为壳幔混合来源。综合分析认为该矿床的成因类型为中低温热液脉型矿床。 |
| 英文摘要: |
| The Wuzhuxinwusu lead polymetallic deposit is a large and medium-sized deposit recently discovered in Damao Banner, Inner Mongolia. It is located in the western part of the XingMeng tectonic zone and belongs to the Bainaimiao-Hadamiao copper-gold fluorite mineralization belt. After describing characteristics of the orebody and ore minerals, fluid inclusions in the main ore-forming stage and the S and Pb isotopes composition have been analyzed in detail to discuss the ore-forming mechanism, including ore-forming fluid sources of the deposit, the characteristics and evolution of fluids. It is found that the homogenization temperature is 247.3 ℃~345.0 ℃ and the salinity is 1.4%~7.17% % NaCleqv in the early stage of mineralization; In the main metallogenic stage, the homogenization temperature is 121.3 ℃~260.1 ℃ and the salinity is 0.88%~11.22% NaCleqv; In the late stage, the homogenization temperature is 115.3 ℃~149.8 ℃ and the salinity is 0.18%~6.16 %NaCleqv, which show characteristics of medium-low temperature deposit. For ore-forming fluids, δ Dv-flow is -112.8‰~-95.1‰, and δ 18OH2O ranges from -4.46‰ to 4.90‰, showing the mixing characteristics of magmatic and atmospheric water. δ 34S values of ore vary from -2.94‰ to 2.73‰, with 206Pb / 204Pb, 207Pb / 204Pb, 208Pb / 204Pb ratios range from 18.1759 to 18.1790,15.5532 to 15.5555,38.0058 to 38.0115, respectively. Sulfur and lead isotopic compositions indicate that the ore-forming materials are derived from crust mantle mixing. Comprehensive analysis shows that the genetic type of the deposit is mesothermal hydrothermal deposit. |
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