| 王磊,方维萱,孙贵远,李志平,刘志强,管诰,夏颜乐.内蒙古甲乌拉银铅锌矿床蚀变-矿化特征研究——基于短波红外光谱技术[J].矿产勘查,2025,16(5):1231-1242 |
| 内蒙古甲乌拉银铅锌矿床蚀变-矿化特征研究——基于短波红外光谱技术 |
| Study on alteration and mineralization characteristics of Jiawula Ag Pb-Zn deposit in Inner Mongolia based on short-wave infrared spectroscopy |
| 投稿时间：2025-03-05 |
| DOI：10.20008/j.kckc.202505027 |
| 中文关键词: 构造岩相 短波红外 热液蚀变 蚀变分带 热液中心 甲乌拉 |
| 英文关键词: tectonic lithofacies short wave infrared hydrothermal alteration alteration zone the hydrothermal center Jiawula |
| 基金项目:本文受云南驰宏锌锗股份有限公司科技计划项目(202106CHRDKCB02)资助。 |
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| 中文摘要: |
| 甲乌拉铅锌矿床随着开采深度的增加面临着资源储量保障问题，存在深部矿体形态复杂，分支复合现象，且小矿体较多，矿体的形态和品位连续性较差等问题，亟需新的找矿思路和技术方法取得找矿突破。本文在大比例尺构造岩相学填图基础上，利用短波红外光谱技术对矿区热液蚀变矿物进行精细探测研究，共识别出绿泥石、白云母、伊利石、方解石、铁白云石、高岭石、蒙脱石等 16种蚀变矿物，围绕矿体及两侧形成梳状石英-伊利石-铁绿泥石-碳酸盐→白云母-伊利石-绿泥石-铁白云石→伊利石-蒙脱-绿泥石→绿泥石-高岭石-方解石的分带特征。矿区深部伊利石化 Al-OH吸收峰波长较小(<2206 nm)和结晶度指数越大(>1.1)，绿泥石化 Fe-OH吸收峰波长较大(>2254 nm)和结晶度指数越大(>3.0)的区域可能是深部的热液中心。通过圈定的热液中心与已知矿体的空间位置，建立了英安玢岩+安山岩—铁绿泥石+伊利石—高品位矿化的岩性-蚀变-矿化对应关系。为解决矿山深部和外围隐伏矿体定位预测提供一定依据。 |
| 英文摘要: |
| The Jiawula lead-zinc deposit encounters challenges related to ore reserve maintenance with the in.crement of mining depth, characterized by complex morphologies of deep ore bodies, prevalent branching and com.posite appearances, along with a multitude of small-scale ore bodies. There are issues with the continuity and con.sistency of ore body shapes and grades. This underscores the immediate requirement for pioneering exploratory strat.egies and technological methodologies to catalyze breakthroughs in mineral discovery. Based upon extensive-scalestructural lithofacies mapping, this paper conducts a detailed investigation into hydrothermal alteration minerals inthe mining area using short-wave infrared (SWIR) spectroscopy technology. Sixteen hydroxyl-bearing alterationminerals, including chlorite, muscovite, illite, calcite, siderite, kaolinite, and montmorillonite, among others, havebeen distinguished. These minerals establish zoning characteristics around the ore bodies and on their flanks, com.prising a segmented assemblage reminiscent of comb-textured quartz-illite-chlorite-carbonate→muscovite-illite-chlorite-siderite→illite-montmorillonite-chlorite→chlorite-kaolinite-calcite. Deep zone illitization with reducedAl-OH absorbance peak wavelength (<2206 nm) and augmented crystallinity indices (>1.1), coupled with chloritiza.tion having expanded Fe-OH absorbance peak wavelengths (>2254 nm) and increased crystallinity indices (>3.0),are indicative of potential hydrothermal centers in the deeper regions. By circumscribing these hydrothermal centersand aligning their spatial distribution with existing ore bodies, a pertinent association between diabase + andesite— chlorite + illite—high-grade mineralization has been established concerning lithology-alteration-mineralizationcorrespondences. This serves to provide a substantial basis for addressing the positioning and predictive assessmentof concealed ore bodies within the depth-extensive regions and periphery of the mine. |
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