| 王锦荣.西藏努日铜多金属矿床蚀变矿物的近红外光谱学研究[J].地质与勘探,2017,53(1):141-150 |
| 西藏努日铜多金属矿床蚀变矿物的近红外光谱学研究 |
| A study of near infrared spectroscopy on altered minerals in the Nuri copper-polymetallic deposit, Tibet |
| 投稿时间：2016-05-03 修订日期：2016-11-12 |
| DOI：10.12134/j.dzykt.2017.01.014 |
| 中文关键词: 西藏努日矿区 近红外光谱 吸收峰位 铜多金属矿 热液中心 |
| 英文关键词: Tibet, Nuri ore district, nearshort wave- infrared spectraoscopyl, sorption peaks, copper- polymetallic ore, the center of oOre-bearing hydrothermal activity |
| 基金项目:西藏山南铜多金属矿整装勘查区专项填图与技术应用示范项目（编号：12120114050801）资助 |
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| 中文摘要: |
| 西藏努日大型铜多金属矿床蚀变作用强烈，主要蚀变类型包括绿泥石化、绢云母化、绿帘石化等。其中，绿泥石—绢云母类蚀变与深部斑岩体热液矿化作用密切相关。通过对20个钻孔岩心开展系统的近红外光谱测量，准确地鉴定了蚀变矿物类型、近红外性质，计算了样品白云母族矿物结晶度指数等，定量地研究了蚀变作用的强度。结果表明，绿泥石光谱波长值与铜钨钼矿化呈一定的正相关性，其中铁镁绿泥石与成矿关系密切；白云母族矿物光谱波长值与铜钨钼矿化呈一定的负相关性，其中钠云母与成矿关系明显；钠云母光谱结晶度指数越大，矿物形成温度越高，越接近含矿热液活动中心，矿化作用越强。在今后努日矿区深部寻找斑岩型矿床的找矿勘查中，应系统地开展近红外光谱测量，准确鉴别蚀变矿物、结合结晶度指数的指标来判断含矿热液活动中心，以指导勘查工程的布设。 |
| 英文摘要: |
| The Nuri copper-polymetallic deposit in Tibet has experienced intense alterations including chloritization, sericitization and epidotization . Among these alterations, chloritization and sericitization are closely related to hydrothermal mineralization of deep porphyry bodies. Twenty drill?cores were investigated using the near infrared spectroscopy to determine types of altered minerals and their near-infrared spectral properties. Quantitative research was conducted on the intensity of alteration. The results show that there is a certain positive correlation between the spectral wavelength values of chlorite and the mineralization of copper, tungsten and molybdenum. Brunsvigite is closely associated with alteration. However, the spectral wavelength values of white mica minerals show a certain negative correlation with the mineralization of copper, tungsten and molybdenum. It is noted that paragonite is closely associated with mineralization. The greater the degree of crystallinity index of paragonite，the higher the formation temperature of minerals. This indicates much closer to the activity center of Ore-bearing hydrothermal solution and a stronger mineralization. During the prospecting and exploration of orphyry-type deposits at depth in the Nuri deposit, near-infrared spectral analysis should be systematically carried out to identify altered minerals accurately and to locate the activity centers of ore-bearing hydrothermal solutions in combination with crystallization indexes. |
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