短波红外光谱矿物测量技术在普朗斑岩铜矿区热液蚀变矿物填图中的应用  

Application of SWIR reflectance spectroscopy to Pulang porphyry copper ore district, Yunnan Province

作　　者：连长云[1] 章革[2] 元春华[1] 

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]中国地质大学,北京100083

出　　处：《矿床地质》2005年第6期621-637,共17页Mineral Deposits

基　　金：中国地质调查局重点项目"成像光谱和便携式近红外光谱填图应用试验研究"(200210000006)的资助

摘　　要：利用便携式短波红外光谱测量仪(PIMA)在云南普朗斑岩铜矿区开展了短波红外光谱测量工作,通过系统的野外数据采集,获得了研究区蚀变矿物组合及主要蚀变矿物的分布,并建立了普朗斑岩铜矿区蚀变矿物分带模式。在此基础上,建立了斑岩铜矿床找矿模型,该模型对普朗铜矿区及其外围的找矿工作具有积极的指导意义。Altered mineral assemblages are important in the understanding and exploration of hydrothermal ore deposits. The altered minerals and their assemblages have traditionally been identified by naked eyes in the field or by microscopes indoors. However, some fine-grained minerals, especially the minerals with varying compositions, can not be identified exactly. The Portable Infrared Mineral Analyzer （PIMA）, a kind of field portable short-wave infrared （SWIR） spectrometer, can partly solve the problem and serve as a valuable tool for recogniz- ing the distribution of altered mineral assemblages. PIMA provides rapid and real time analysis of some altered minerals such as phyllosilicates, clays, carbonatites, and selected sulfates, particularly alunite and jarosite. The analysis of data sets requires the use of the spectral reference libraries from different geological environments and may be aided in some cases by computer data-processing packages, integration of altered mineral assemblages and other exploration data is of benefit to locating drill holes and guiding the exploration work. PIMA can be used in numerous ore-forming environments, such as the hydrothermal system with highand/or low-sulfidation, porphyry, mesothermal fluids, sediments-hosted gold and copper, and VMS. Case studies in the Pulang copper ore district of Yunnan Province demonstrate that PIMA has the ability to rapidly acquire the data and produce drill logging maps, thus helpful to delineating areas for future work. In this paper, the authors deal in detail with the results of PIMA applying to mapping altered minerals in the Pulang copper ore district. The exploration model based on the SWlR measurement proves to be effective in practical exploration.

关 键 词：地质学 短波红外光谱矿物测量技术 PIMA 蚀变矿物 普朗 云南 

分 类 号：P618.41[天文地球—矿床学] P627[天文地球—地质学]