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现代地质 ›› 2023, Vol. 37 ›› Issue (06): 1538-1552.DOI: 10.19657/j.geoscience.1000-8527.2023.057

• 矿床学与区域成矿学 • 上一篇    下一篇

云南个旧芦塘坝—阿西寨地区深部矿化的浅部表征:构造蚀变与原生晕指示

常华诚1(), 焦骞骞1(), 江小均1, 范柱国1, 芦磊1,2, 阮班朗1, 邓梅3   

  1. 1.昆明理工大学国土资源工程学院,云南 昆明 650093
    2.云南锡业股份有限公司大屯锡矿,云南 个旧 661021
    3.嵩明县自然资源局土地矿产储备中心,云南 昆明 651799
  • 收稿日期:2022-11-30 修回日期:2023-06-08 出版日期:2023-12-10 发布日期:2024-01-24
  • 通讯作者: 焦骞骞,男,博士,讲师,1986年出生,构造地质学专业,主要从事构造地质与成矿作用的教学和研究。Email:289284567@qq.com
  • 作者简介:常华诚,男,硕士研究生,1998年出生,矿物学、岩石学、矿床学专业,主要从事热液矿床的研究。Email:1224307399@qq.com
  • 基金资助:
    云南省重大科技项目“云南省个旧—麻栗坡矿集区多类型多期次锡钨矿成矿规律及增储”(202202AG050006);云南省顶尖团队培育项目“云南省三江成矿系统与评价”(202305AS350015);云南锡业股份有限公司项目“高松矿田芦塘坝-麒阿西断裂夹持带层间氧化矿找矿研究”(202006CHYCDZB08)

Surface Indicators for Deep Mineralization in the Lutangba-Axizhai Area of Gejiu, Yunnan Province: Implications from Tectonic Alteration and Primary Geochemical Halos

CHANG Huacheng1(), JIAO Qianqian1(), JIANG Xiaojun1, FAN Zhuguo1, LU Lei1,2, RUAN Banlang1, DENG Mei3   

  1. 1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China
    2. Datun Tin Mine, Yunnan Tin Mining Company (Ltd.), Gejiu, Yunnan 661021, China
    3. Songming Bureau of Natural Resources Land Mineral Reserve Center, Kunming, Yunnan 651799, China
  • Received:2022-11-30 Revised:2023-06-08 Online:2023-12-10 Published:2024-01-24

摘要:

层间氧化矿是个旧高松矿田重要的锡矿化类型。加强该类型矿化的研究与勘探工作有望成为缓解老矿山资源危机、提升矿产储量的有效手段之一。本文选择具有层间氧化矿良好成矿条件的芦塘坝—阿西寨地区为研究区,开展地表构造蚀变和原生晕地球化学研究,为该地区层间氧化矿的勘查提供新的依据。野外地质调查表明,研究区地表矿化蚀变明显受断裂控制,特别是NE向断裂与EW向断裂交汇部位蚀变强烈,主要由铁泥质蚀变和方解石脉构成。蚀变岩及围岩中13种关键元素组合分析揭示Cd、As、Sb、Pb和Zn对寻找Sn矿体有良好的指示意义。根据地表原生晕地球化学综合异常分布,结合构造蚀变带特征,圈定出Ⅰ至Ⅳ 4个成矿靶区。通过对比分析各靶区原生晕的前缘晕、近矿晕和尾晕的元素组合特征,推测Ⅰ和Ⅱ号靶区深部层间氧化矿找矿潜力较好;Ⅲ号靶区地表氧化矿已被剥蚀,但深部有可能存在硫化矿;Ⅳ号靶区深部可能有少量剩余的未被剥蚀的氧化Sn矿体。

关键词: 高松矿田, 层间氧化矿, 原生晕, 构造蚀变, 个旧锡矿

Abstract:

Interlayer oxidized tin ore is a significant mineralization type in the Gaosong orefield at Gejiu. Enhancing the study and exploration for this type of tin mineralization is important to relieve resource crisis and increase the reserve for exhausting mines. We study the surface tectonic alteration and primary geochemical halo in the Lutangba-Axizhai area which shows beneficial mineralization conditions for interlayer oxidized deposits, to provide a new basis for their exploration. Field geological survey exhabits that the surface mineralization/alteration is mainly composed of iron alteration, argillization and calcite veins. It is commonly controlled by faults, especially at the intersection of NE- and EW-trending ones. The integrated analysis of 13 key elements in the altered rocks and wallrocks suggests that Cd, As, Sb, Pb and Zn are potential indicators for Sn orebody. The integrated anomaly distribution of primary geochemical halos in combination with the characteristics of structural alteration zones delineate four metallogenic target zones (Ⅰ to Ⅳ). Comparation and analysis on the front-, near- and rear-halo element combination characteristics of primary geochemical halos in each target area shows that target zone Ⅰ and Ⅱ seem to have deep interlayer oxidized tin ore prospecting potential; target zone Ⅲ with the oxidized ore is probably eroded on the surface, and have deep sulfide ore potential; target zone Ⅳ likely has small amount of uneroded remnant orebodies at depth.

Key words: Gaosong ore field, layer oxidize tin ore, primary halo, structural alteration, Gejiu tin mine

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