投稿时间：2022-08-22
修订日期：2023-03-03
网络发布日期：2023-05-06
中文摘要:托库孜巴依矿床和金坝矿床位于中国阿尔泰南缘西段，是中亚成矿域的重要组成部分。矿区内广泛分布闪长岩脉，与金矿脉具有密切的空间关系，但其与金成矿是否具有成因关系尚不清楚。本次研究采用野外调查、显微鉴定、矿物自动分析系统、LA-ICP-MS等分析方法，对金成矿作用与闪长岩脉的关系进行探讨。实验结果表明：①托库孜巴依矿床和金坝矿床中闪长岩脉受金矿脉穿切，其中闪长岩脉经历了明显的构造变形，而金矿脉却未见显示；②金主要分布在石英脉及两侧蚀变带中，托库孜巴依矿床金矿物主要为碲金矿，金坝矿床则以自然金、碲金银矿为主；③托库孜巴依矿床与金坝矿床闪长岩具有相近的锆石U-Pb加权平均年龄，分别为（382.3±0.9）Ma和（385.5±2.0）Ma，形成于中泥盆世古亚洲洋俯冲期。综合前人研究，金成矿于晚石炭世—早二叠世后碰撞期，闪长岩明显早于金矿形成，二者并不具备成因关系。金成矿可能与韧性剪切带和同期的岩浆活动有关，未来的勘查工作应聚焦于含金石英脉与同期岩浆岩体周围。
Abstract:The Tokuzbay and Jinba gold deposits are located in the southern margin of the western Altai range, China. Diorite dikes are widely distributed in the mining area and have close spatial relationship with gold veins, but it is not clear whether they have genetic relationship with gold mineralization. The relationship between gold and diorite dikes was studied by means of field investigation, microscopic identification, Mineral Liberation Analyzer and LA-ICP-MS analysis. The results show that:① The diorite dikes are cut by the auriferous veins in the Tokuzbay and Jinba deposits, and the diorite dikes undergo obvious tectonic deformation, but the auriferous veins do not show; ② The gold is mainly distributed in quartz veins and alteration zones on both sides of the vein. The gold-bearing minerals are mainly calaverite in the Tokuzbay deposit, and natural gold and petzite in the Jinba deposit; ③ The diorites of the two deposits have similar zircon U-Pb dating ages, namely (382.3±0.9)Ma and (385.5±2.0)Ma, and were formed during the Middle Devonian subduction of the Paleo-Asian Ocean. According to previous studies, the gold deposit was formed in Late Carboniferous-Early Permian post-collision period, diorite was formed earlier than gold deposits, and there is no genetic relationship between them. The formation of the two gold deposits may be related to the contemporaneous tectonic magmatic activities. Future exploration work should focus on the deep extension of gold bearing quartz veins and the coeval magmatic rocks.
keywords:geology diorite gold deposit zircon U-Pb dating mineral liberation analyzer Tokuzbay Jinba Altai orogenic belt
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基金项目:本文得到新疆哈巴河县托库孜巴依金矿带成矿规律研究与找矿预测（编号：738010593）和中南大学研究生科研创新项目（编号：506021736）联合资助
引用文本：
覃毅学,孔华,段旦,刘飚,吴堑虹,包中林,吴鸿飞.2023.新疆托库孜巴依和金坝矿床闪长岩与金成矿关系：锆石定年与载金矿物特征约束[J].矿床地质,42(2):381~395QIN YiXue,KONG Hua,DUAN Dan,LIU Biao,WU QianHong,BAO ZhongLin,WU HongFei.2023.Relationship between diorite and gold mineralization at Tokuzbay and Jinba gold deposits, Xinjiang Province: Constraints from zircon dating and gold-bearing mineral characteristics[J].Mineral Deposits42(2):381~395
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