| 王秋蕴,赵伟策,赵晓波,时一苇,刘洋涛.西天山塔乌尔别克金矿热液方解石稀土元素与 C-O同位素研究[J].矿产勘查,2025,16(5):1054-1064 |
| 西天山塔乌尔别克金矿热液方解石稀土元素与 C-O同位素研究 |
| Rare earth elements and C-O isotopes of hydrothermal calcite in the Tawuerbieke gold deposit, western Tianshan |
| 投稿时间：2025-04-01 |
| DOI：10.20008/j.kckc.202505010 |
| 中文关键词: 浅成低温热液型金矿 稀土元素 C-O同位素 塔乌尔别克金矿 吐拉苏盆地 |
| 英文关键词: epithermal gold deposit rare earth elements C-O isotopes Tawuerbieke gold deposit Tulasu basin |
| 基金项目:本文受新疆维吾尔自治区重点研发计划项目(2024B03005)资助。 |
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| 中文摘要: |
| 塔乌尔别克金矿床位于西天山吐拉苏火山-沉积盆地，浅成低温热液金矿化及相关蚀变发育于下石炭统大哈拉军山组火山岩中，受近 NNW-SSE或 N-S向断裂及其交汇部位控制。本文对塔乌尔别克金矿床成矿早期(NW走向)和成矿晚期(NE走向)两期方解石脉进行了稀土元素组成和 C-O同位素地球化学研究，以期揭示其流体演化与物质来源。结果表明，成矿早期方解石 δEu值为 1.09~4.74，δCe值为 0.76~0.94，显示 Eu正异常，Ce轻微负异常；而成矿晚期方解石 δEu为 0.73~0.85，δCe为 0.82~0.95，显示 Eu负异常，Ce负异常不明显；这表明成矿流体从早期的相对氧化状态逐渐演化至晚期的相对还原状态。成矿早期方解石的 δ13CV-PDB介于 0.2‰~1.8‰，δ18OV-SMOW介于 12.1‰~15.3‰，指示其成矿流体主要来源于碳酸盐岩的溶解作用，且 δ18OV-SMOW变化范围较宽，反映了大气降水的混入；晚期方解石 δ13CV-PDB介于-0.1‰~1‰，δ18OV-SMOW介于 9.2‰~9.9‰，表明其成矿流体主要由岩浆结晶分异作用产生。结合前人研究成果，本文认为，塔乌尔别克金矿床成矿早期的氧化性流体有利于金的富集与沉淀，成矿晚期还原性环境导致金沉淀效率大大降低。 |
| 英文摘要: |
| The Tawuerbieke gold deposit is located in the Tulasu volcanic-sedimentary basin of the WesternTianshan. The epithermal gold mineralization and associated alteration are developed in the volcanic rocks of theEarly Carboniferous Dahalajunshan Formation, controlled by NNW-and N-trending faults and their intersections.This paper investigates rare earth element (REE) compositions and C-O isotopic geochemistry of early-stage (NW-trending) and late-stage (NE-trending) calcite veins in the Tawuerbieke gold deposit to elucidate the fluid evolutionand the sources of ore-forming materials. The results show that the early-stage calcite has δEu and δCe values rang.ing from 1.09 to 4.74 and from 0.76 to 0.94, respectively, displaying positive Eu anomalies and slightly negative Ceanomalies. In contrast, the late-stage calcite has δEu values of 0.73-0.85 and δCe values of 0.82-0.95, showingnegative Eu anomalies and slightly negative Ce anomalies. This indicates that the ore-forming fluids evolved from arelatively oxidized state in the early stage to a relatively reduced state in the late stage. The early-stage calcite hasδ13CV-PDB and δ18OV-SMOW values ranging from 0.2‰ to 1.8‰ and from 12.1‰ to 15.3‰, respectively, suggesting asource of carbonate dissolution. The late-stage calcite has δ13CV-PDB values of .0.1‰ to 1‰ and δ18OV-SMOW values of 9.2‰ to 9.9‰, indicating magmatic crystallization differentiation. Combined with previous studies, we propose thatthe oxidized fluids in the early stage of the Tawuerbieke gold deposit facilitated the enrichment and precipitation ofgold, while the reduced environment in the late stage significantly decreased the efficiency of gold precipitation. |
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