| 汪重午.基于短波红外技术的斑岩-矽卡岩型矿床中绿泥石蚀变分布特征研究：以西藏甲玛铜多金属矿为例[J].地质与勘探,2014,50(6):1137-1146 |
| 基于短波红外技术的斑岩-矽卡岩型矿床中绿泥石蚀变分布特征研究：以西藏甲玛铜多金属矿为例 |
| Characteristics of the chlorite alteration in the porphyry-skarn deposit based on short-wavelength infrared technology：A case study of the Jiama copper-polymetallic deposit in Tibet |
| 投稿时间：2014-06-19 修订日期：2014-10-15 |
| DOI： |
| 中文关键词: 西藏甲玛矿床 高光谱短波红外技术 绿泥石 热液蚀变 光谱参数三维模型 |
| 英文关键词: Jiama,hyperspectral short-wavelength infrared technology,chlorite,hydrothermal alteration,3D model of spectral parameters |
| 基金项目:国家自然科学基金“斑岩铜矿高光谱短波红外勘查模型构建研究”（编号：41302265）；西藏华泰龙矿业开发有限公司勘探项目、技术开发项目“西藏墨竹工卡县甲玛铜多金属矿床地质特征及找矿方向研究项目”（E0804）；西藏自治区矿产资源潜力评价项目(1212010813025)共同资助 |
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| 摘要点击次数: 1830 |
| 全文下载次数: 1973 |
| 中文摘要: |
| 应用美国SVC HR1024便携式地物光谱仪对西藏甲玛斑岩-矽卡岩型铜多金属矿床的44个钻孔及其外围7963件岩石样品进行了基于高光谱短波红外技术的测量与分析。研究中发现该矿床青盘岩化带中的主要蚀变矿物绿泥石在短波红外区间的波长呈现规律性变化,该现象反映了绿泥石晶体结构中Fe、Mg离子含量的变化特征。甲玛斑岩-矽卡岩矿床的角岩矿体及其外围富集着大量绿泥石矿物,其中富镁绿泥石反映了较高温环境下的区域性热液蚀变作用，而矿体中上部存在的少量富铁绿泥石则与广泛发育的裂隙系统相关，显示了后期温度降低、酸性减弱的蚀变环境。岩石样品中的绿泥石矿物出现了富镁→富铁的环带状分布特征，体现了岩浆活动的变化特征，并由此推断甲玛矿床外围仍然具有一定找矿潜力。 |
| 英文摘要: |
| Samples from 44 drill holes and 7,963 rocks in the Jiama porphyry-skarn copper deposit have been measured and analyzed with American portable spectrometer SVC HR1024 based on the hyperspectral short-wave infrared technology. The study found that the main altered mineral in propylitization zone—chlorit with characteristic absorption wavelength in SWIR exhibits a regular variation. We hold that the variation of wavelength reflects different contents of Fe and Mg in chlorite. Many chlorite samples were detected outside and inside the hornfels ore body in the Jiama porphyry-skarn copper deposit. The Mg-chlorite represents a regional hydrothermal alteration event with higher temperature, while the Fe-chlorite formed in the upper part of the ore body is related to the extensive fissure system in Jiama, which represents temperature reduction and acidity decrease in the later period. The chlorite from rock samples shows annular distribution characteristics from Mg-rich to Fe-rich, which was resulted from magmatic events. And therefore we infer the margin of the Jiama deposit has prospecting potential. |
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