| 章培春,武利文,郭灵俊,杨建军,张弘,王晓敏,韩丽.大兴安岭南段布敦乌拉脉状银矿床成因:黄铁矿 LA-(MC)-ICP-MS微量元素及硫同位素的制约[J].矿产勘查,2026,17(6):975-985 |
| 大兴安岭南段布敦乌拉脉状银矿床成因:黄铁矿 LA-(MC)-ICP-MS微量元素及硫同位素的制约 |
| The genesis of the Budunwula vein-type silver deposit in the Southern Da Hinggan Mountains: Constraints from trace elements and sulfur isotopes of pyrite by LA-(MC)-ICP-MS |
| 投稿时间：2024-11-23 |
| DOI：10.20008/j.kckc.202606004 |
| 中文关键词: 微量元素 硫同位素 LA-(MC)-ICP-MS 布敦乌拉银矿床 大兴安岭南段 |
| 英文关键词: trace element sulfur isotope LA-(MC)-ICP-MS the Budunwula silver deposit the Southern Da Hinggan Mountains |
| 基金项目:本文受内蒙古自治区科技“突围”工程“揭榜挂帅”项目大数据驱动的智能化矿产资源预测关键技术研发与示范应用(2025KJTW0020)与内蒙古自治区地质勘查基金项目(2015-01-YS01)联合资助。 |
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| 中文摘要: |
| 大兴安岭南段西坡布敦乌拉中型脉状银矿床成因研究对认识大兴安岭南段岩浆-热液成矿系统具有重要意义。本文通过野外地质调查、室内镜下观察及不同成矿阶段黄铁矿 LA-(MC)-ICP-MS微量元素、硫同位素测试，对布敦乌拉矿床成矿物质来源、成矿流体性质及矿床成因进行约束。布敦乌拉矿床成矿早阶段黄铁矿(PyⅠ)颗粒较大，局部被晚阶段黄铁矿及含银矿物集合体包裹；主成矿阶段黄铁矿(PyⅡ)多与含银矿物共生，呈脉状产出。微量元素分析结果显示，黄铁矿 Co、Ni值普遍较低，形成温度可能较低；成矿早阶段黄铁矿富集轻稀土，Hf/Sm、Nb/La、Th/La值大于 1，主成矿阶段富集重稀土，Hf/Sm、Nb/La值小于 1，成矿流体由早到晚由富 F转变为富 Cl。硫同位素分析结果显示，主成矿阶段黄铁矿(PyⅡ)δ34S值为 -3.39‰~-1.85‰，指示矿床成矿物质可能源于深部岩浆活动。综上，结合区域成矿特征，布敦乌拉矿床可能为岩浆-热液成矿系统远端成矿作用的产物，与南东侧白音查干东山矿床具有一定联系。 |
| 英文摘要: |
| The Budunwula medium-sized vein silver deposit on the western slope of the Southern Da HingganMountains is of significant importance for understanding the magmatic-hydrothermal mineralization system in thisregion through its genetic study. This paper constrains the source of ore-forming materials, the nature of the ore-forming fluids, and the genesis of the Budunwula deposit through field geological surveys, indoor microscopic obser-vations, and LA-(MC) -ICP-MS trace element and sulfur isotope testing of pyrite from different mineralizationstages. The early-stage pyrite (PyⅠ) in the Budunwula deposit has relatively large grains and is locally envelopedby late-stage pyrite and silver-bearing mineral aggregates; the main-stage pyrite (Py Ⅱ) is often associated withsilver-bearing minerals and occurs in veins. Trace element analysis results show that the Co and Ni values in pyriteare generally low, suggesting a possibly low formation temperature; the early-stage pyrite is enriched in light rareearth elements, with Hf/Sm, Nb/La, and Th/La ratios greater than 1, while the main-stage pyrite is enriched inheavy rare earth elements, with Hf/Sm and Nb/La ratios less than 1, indicating a shift from F-rich to Cl-rich ore-forming fluids from early to late stages. Sulfur isotope analysis results show that the δ34S values of the main-stage py-rite (PyⅡ) range from -3.39‰ to -1.85‰, suggesting that the ore-forming materials may have originated from deepmagmatic activities. In summary, considering the regional mineralization characteristics, the Budunwula deposit islikely a product of distal mineralization in a magmatic-hydrothermal system and has a certain connection with theDongshan deposit in Baiyinchagan to the southeast. |
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