【作者】 陈娟；

【导师】 刘文元；

【作者基本信息】 福州大学 ， 矿产普查与勘探， 2023， 硕士

【摘要】 塞尔维亚Bor铜金矿床是Timok矿集区内发育的大型斑岩-浅成低温热液型铜金矿床,储量大、埋藏深,具有重要的研究价值。为实现对该矿床的深边部找矿勘查研究,本文结合短波红外技术、X射线衍射(XRD)、电子探针(EPMA)等多种测试技术,对Bor铜金矿床的蚀变矿物的岩相学特征、光谱学特征以及矿物晶体化学特征等方面进行研究,通过对Bor铜金矿床进行蚀变矿物的精细填图,结合指针矿物白云母的晶体化学特征,初步建立蚀变矿物的勘查标识,并为塞尔维亚Bor矿区的深边部找矿提供理论依据。短波红外光谱学研究表明,Bor矿床内发育多种蚀变矿物,且具有明显的分带特征,下部带以斑岩型矿化有关的绢英岩化蚀变为主,从强绢云母化逐渐向硬石膏化、绿泥石-绢云母化过渡,该蚀变带内主要发育绢云母、绿泥石、硬石膏、方解石等;该矿床中深部地区发育一套以水铝石-叶蜡石-红柱石为主的蚀变矿物组合,其可能代表着斑岩型与高硫化型之间叠加蚀变带的特征;上部带以高硫化型矿化有关的高级泥化蚀变为主,主要发育高岭石、迪开石、水铝石、叶蜡石、明矾石等蚀变矿物。白云母族矿物属于该矿区内发育最广泛的蚀变矿物。短波红外光谱特征显示,塞尔维亚Bor矿区的白云母族矿物主要包括:钠云母、普通白云母、多硅白云母三种类型;电子探针成分分析结果表明:研究区内白云母整体上呈现出高Si、低Al、K的特点,指示白云母总体上的形成温度偏低,在绿泥石-绢云母化蚀变带和中浅部过渡带内发育多硅白云母,具有相对富Si、Mg、Fe,贫Al的特征,其形成温度相对较高;下部绢英岩化蚀变带中发育的白云母族矿物,在垂向蚀变分带中(浅部→深部)Si含量逐渐减少,K含量逐渐增大,表明该矿区内由浅至深绢云母化蚀变逐渐增强。白云母族矿物的w Al OH值与元素之间具有的相关性,说明白云母族矿物的w Al OH值(短波红外2200nm处的吸收峰值)可以指示矿物中元素的变化趋势;ISM值(ISM=depth2200/depth1900)与品位又存在相同的变化趋势,因此,提出白云母族矿物的ISM值可用于指示矿化中心。本次研究结合蚀变矿物矿物学特征、红外光谱特征、矿物晶体化学特征等多元信息的耦合特征分析,建立Bor矿区的找矿勘查模型,初步建立该矿区的蚀变勘查标识。更多还原

【Abstract】 The Bor copper-gold deposit in Serbia is a large porphyry-epithermal copper-gold deposit in the Timok mineralization concentrated area,with large reserves and deep burial,which has important research value.In this study,combined with short-wave infrared technology,X-ray diffraction(XRD)and electron probe(EPMA),to study the characteristics of lithography,spectroscopy and mineral crystal chemical characteristics of the altered minerals in the Bor deposit.Through the mapping of altered minerals in the Bor copper-gold deposit,combined with the crystal chemical characteristics of the pointer mineral muscovite,to establish the exploration identification of altered minerals,and the theoretical basis is provided for the deep margin prospecting of Bor mining area.Bor deposits contain various alteration minerals and have obvious zonal characteristics by the study of SWIR.The upper zone is mainly advanced argillic alteration related to high sulfide mineralization,and the main alteration minerals are kaolinite,dickite,diaspore,pyrophyllite and alunite.In the deep part of the deposit,there is a set of alteration mineral assemblages mainly composed of diaspore,pyrophyllite and andalusite,which may represent the characteristics of superimposed alteration zones between porphyry and high sulfide mineralization.The lower zone is mainly propylitic alteration related to porphyry mineralization,which gradually transitions from silicification and sericitization to gypsum and chlorite-sericite alteration.The main alteration minerals in this zone are sericite,chlorite,gypsum,calcite and so on.Combining microscopic features and XRD phase analysis,the white mica group is the most widely developed alteration minerals in this mining area.The short-wave infrared spectroscopic characteristics of white mica group shows that the white mica minerals in Bor mining area mainly divided into three types:paragonite,muscovite and phengite.The results of electron probe composition analysis show that the white mica in the study area is high Si,low Al,and K,indicating that the formation temperature of white mica is generally low.Phengite is developed in the chlorite-sericite alteration zone and the middle and shallow transition zone with relatively rich Si,Mg,Fe and poor Al characteristics,indicating a relatively high formation temperature.The white mica mineral developed in the altered rock in the lower part of the ore body shows that Si content gradually decreases from shallow to deep in the vertical alteration zone(shallow to deep),while K content gradually increases,indicating that sericite alteration gradually strengthens from shallow to deep in this mining area.The correlation between w Al OH value of white mica group and elements indicates that w Al OH value of white mica group can indicate the change trend of elements in minerals.The ISM value has the same change trend as grade,so it is proposed that ISM value of white mica mineral can be used to indicate mineralization center.In this study,combined with the coupling analysis of multiple information such as the mineralogical characteristics,infrared spectral characteristics,and crystal chemical characteristics of the altered minerals,to preliminarily establish the alteration exploration identification of the ore area.更多还原