| 西藏多龙矿集区铁格隆南铜(金)矿床黄铁矿特征及意义 |
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| 引用本文：张琪,陈伟,杨欢欢,付雪莲,王勤,李彦波,李宏伟,辛堂,梁鑫娟,李社,刘长城.2023.西藏多龙矿集区铁格隆南铜(金)矿床黄铁矿特征及意义[J].地球学报,44(6):983-999. |
| DOI：10.3975/cagsb.2023.032301 |
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| 基金项目:国家重点研发计划项目“西藏铜多金属资源基地绿色勘查与增储示范”(编号: 2022YFC2905001);国家自然科学基金项目(编号: 42002103);中国地质调查局地质调查项目“铜(金)锑等紧缺战略性矿产调查与潜力评价”(编号: DD20230054) |
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| 中文摘要:铁格隆南斑岩-浅成低温热液型铜(金)矿床是班公湖—怒江成矿带上最重要的矿床之一。本文以矿床内发育的黄铁矿为主要研究对象, 对其开展微量元素、稀土元素和硫同位素分析。依据产出状态, 黄铁矿可以分为黄铁矿-1, 黄铁矿-2和黄铁矿-3, 其中黄铁矿-2与浅成低温热液型矿化相关, 黄铁矿-3与斑岩型矿化相关。黄铁矿-1的Au、Ag、Cu、Pb、Zn、Bi的含量最低, 黄铁矿-2的Au、Ag、Cu、Pb、Zn、Bi的含量最高。Cu和Ni、Ag和Cu、Cu和Pb、Ag和Pb、Pb和Zn的相关性可作为黄铁矿-2和黄铁矿-3的辨别标志。黄铁矿-1的δ34S值(1.9‰)最大; 黄铁矿-2和黄铁矿-3的δ34S值在–4.5‰～0.3‰之间。黄铁矿富集轻稀土, 亏损重稀土, 具有“右倾”式稀土配分模式, 浅部(200—450 m)黄铁矿的轻重稀土分异程度较大, 以正铕异常为主, 而深部(700—1000 m)黄铁矿轻重稀土分异相对较小, 以负铕异常为主。铁格隆南矿床含硫热液运移方向为横向上从ZK1604向东运移, 纵向以ZK1604的230—250 m为中心向深部和侧向运移。黄铁矿中高含量的Cu、Au、Ag以及Ag和Cu、Pb和Zn、Cu和Pb、Ag和Pb的正相关性是指示浅成低温热液型矿化的重要标志, 而黄铁矿内Cu和Ni的负相关性是指示斑岩型矿化的标志。 |
| 中文关键词:西藏 铁格隆南斑岩-浅成低温热液矿床 黄铁矿 元素地球化学 硫同位素 |
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| Characteristic and Significance of Pyrite at Tiegelongnan Cu (Au) Deposit, Duolong Ore District, Tibet |
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| Abstract:The Tiegelongnan porphyry-epithermal Cu (Au) deposit is one of the most important deposits in the Bangongco–Nujiang metallogenic belt, where pyrite is extensively developed. In this study, trace elements, rare earth elements (REE), and S isotopes of pyrite were analyzed. Three types of pyrite were identified according to their occurrence characteristics: pyrite-1 and pyrite-2 were related to epithermal mineralization, and pyrite-3 was related to porphyry mineralization. Pyrite-1 had the lowest Au, Ag, Cu, Pb, Zn, and Bi concentrations, whereas pyrite-2 had the highest Au, Ag, Cu, Pb, Zn, and Bi concentrations. The correlations between Cu and Ni, Ag and Cu, Cu and Pb, Ag and Pb, and Pb and Zn could be used to distinguish pyrite-2 from pyrite-3. The δ34S value for pyrite-1 (1.9‰) was the highest among the three types. The δ34S values for pyrite-2 and pyrite-3 were between –4.5‰ and 0.3‰, respectively. Pyrite was rich in LREE and depleted HREE and hada “right tilt” pattern in REE distribution. The REE differentiation of pyrite in the shallow deposits (200–450 m) was relatively large with a positive Eu anomaly, whereas the REE differentiation of pyrite in deeper deposits (700–1000 m) was small with a negative Eu anomaly. The migration direction of the sulfur-containing hydrothermal solution in the Tiegelongnan deposit was horizontal from ZK1604 towards the East and vertical from 230–250 m at ZK1604 to the deep and lateral. The high concentrations of Cu, Au, and Ag in pyrite and the positive correlations between Ag and Cu, Pb and Zn, Cu and Pb, and Ag and Pb were important indicators of epithermal mineralization, whereas the negative correlation between Cu and Ni in pyrite indicated porphyry mineralization. |
| keywords:Tibet Tiegelongnan porphyry-epithermal deposit pyrite element geochemistry S isotope |
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