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西藏班公湖-怒江成矿带商旭金矿成矿时代探讨及其地质意义
投稿时间:2019-12-10  修订日期:2020-06-01  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020168
摘要点击次数: 53
全文下载次数: 54
作者单位E-mail
方向 中国地质科学院矿产资源研究所 francisfx@126.com 
宋扬 中国地质科学院矿产资源研究所 songyang100@126.com 
唐菊兴 中国地质科学院矿产资源研究所  
王嘉星 中国地质大学地球科学与资源学院  
李海峰 中国地质大学地球科学与资源学院  
基金项目:国家重点研发计划,中国地质调查局项目,公益性行业科研专项,中国地质科学院院基本科研业务费,国家自然科学基金项目,中国国家留学基金
中文摘要:造山型金矿在世界范围内具有重要的经济价值和找矿潜力,也是西藏班公湖-怒江铜多金属资源基地的主攻矿床类型之一。班公湖-怒江成矿带是近十年来识别和建立的我国最重要的斑岩-浅成低温热液-矽卡岩型铜金成矿带。商旭金矿位于班公湖-怒江缝合带中段,是该成矿带上首例造山型金矿床。矿体产于中-下侏罗统木嘎岗日群沉积岩,由石英脉、碳酸盐+石英脉和蚀变岩构成,呈透镜状、块状、条带状、鞍状、浸染状、角砾状等产出,受北西西向的区域断裂构造控制。热液蚀变发育碳酸盐化、白云母化、绿泥石化和硫化物蚀变等。矿物学研究和含矿脉体特征表明,早期热液活动发育于挤压应力环境,后期挤压应力逐渐消失,对应了变形晚期的构造环境。含金石英流体包裹体的Rb-Sr同位素测试获取的等时线年龄为135.6±2.7Ma,87Sr/86Sr平均初始比值为0.713,预示成矿作用发生于早白垩世,成矿物质主要来自地壳。综合研究认为,商旭金矿形成于早白垩世初班公湖-怒江缝合带中段的闭合期,地块间挤压应力致使木嘎岗日群发生构造变形,在挤压变形晚期构造环境发生转换的过程,围岩中应力释放促成了区域的金矿化。对比研究显示,商旭金矿化与世界大型、超大型造山型金矿在矿床地质、热液蚀变特征、成矿流体性质、成矿构造环境、动力学背景等方面具有相似性,进一步表明班-怒带具备寻找造山型金矿的潜力。
中文关键词:成矿时代  造山型金矿  商旭  成矿地质背景  班公湖-怒江  西藏
 
Metallogenic epoch study on the Shangxu gold deposit, Bangong-Nujiang Suture Zone, Tibet and its geological implications
Author NameAffiliationE-mail
Fang Xiang Chinese Academy of Geological Sciences, Institute of Mineral Resources francisfx@126.com 
Song Yang Chinese Academy of Geological Sciences, Institute of Mineral Resources songyang100@126.com 
Tang Ju Xing Chinese Academy of Geological Sciences, Institute of Mineral Resources  
Wang Jia Xing School of Earth Sciences and Resources, China University of Geosciences (Beijing)  
Li Hai Feng School of Earth Sciences and Resources, China University of Geosciences (Beijing)  
Abstract:The orogenic gold deposit is an economically important mineralization worldwide, which is thus a main aim of the mineral exploration in the Bangong-Nujiang Copper Polymetallic Resources Base. The Bangong-Nujiang metallogenic belt is one of the most important porphyry-epithermal-skarn copper and gold resource belt that has been recognized and developed in recent ten years in China. The Shangxu gold deposit, situated in the middle of the Bangong-Nujiang belt, is the first orogenic gold deposit in this metallogenic belt. Mineralization is hosted by the Early to Middle Jurassic turbidite of the Mugagangri Group, and comprised of quartz lodes, carbonate+quartz veins and altered rocks, with lentoid, massive, laminated, saddle, disseminated, brecciated structures. Mineralization is controlled by the NWW-stretching regional fault system. Hydrothermal alteration includes carbonatization, muscovitization, chloritization and sulfidation. The mineralogy study and the characteristics of gold lodes indicate that the early hydrothermal activity developed in a compressional environment, and the compression stress decreased and disappeared in the late hydrothermal stage. This could correspond to a late tectonic deformation setting. The Rb-Sr isotopes of quartz fluid incluisions lead to an isochron age of 135.6±2.7Ma, with an average initial 87Sr/86Sr value of 0.713, indicating that mineralization developed in the Early Cretaceous, and the ore-forming materials were sourced from the crust. Integrated study shows that the formation of the Shangxu gold deposit was coincident with the closing process of the middle Bangong-Nujiang suture during the Early Cretaceous. The compression stress between terranes caused regional deformation and metamorphism to the host rock of the Mugagangri Group. During the change process of the tectonic setting in the late compression deformation, stress relief might lead to gold mineralization. A comparison study shows that the Shangxu gold mineralization shares similarities in deposit geology, hydrothermal alterations, ore-forming fluids, tectonic settings and geodynamic settings with large and world-class orogenic gold deposits around the world, indicating the potential of orogenic gold mineralization along the Bangong-Nujiang belt.
keywords:metallogenic age  Orogenic gold  Shangxu  Geological setting of metallogeny  Bangong-Nujiang  Tibet
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