云南普朗铜矿首采区构造(蚀变岩)地球化学特征及找矿预测  

Geochemical Characteristics of Tectonic(Altered Rock)in the Initial Mining Area and Prospecting Prediction of Yunnan Pulang Porphyry Copper Deposit

作　　者：朱振东 李正章 李志鹏 杨帆 任涛[1] 管申进 王雷[1] 吴练荣 ZHU Zhendong;LI Zhengzhang;LI Zhipeng;YANG Fan;REN Tao;GUAN Shenjin;WANG Lei;WU Lianrong(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;China Copper Mining Resources Co.Ltd.,Kunming 650051,Yunnan,China;Diqing Nonferrous Metals Co.Ltd.,Shangri-La 674400,Yunnan,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]中铜矿产资源有限公司,云南昆明650051 [3]云南迪庆有色金属有限责任公司,云南香格里拉674400

出　　处：《大地构造与成矿学》2023年第5期1002-1017,共16页Geotectonica et Metallogenia

基　　金：校企合作项目(HZ2021F0427);云南省兴滇英才支持计划“青年人才”专项;云南省重大科技专项(202202AG050014)联合资助。

摘　　要：普朗铜矿床是格咱岛弧内最大的斑岩型Cu-Au-Mo矿床,主矿体的展布与复式斑岩体、岩体裂隙发育程度、钾化与青磐岩化蚀变带分布密切相关,为构造(蚀变岩)地球化学勘查技术应用奠定了基础。本次在对首采区8线剖面进行构造-蚀变-矿化编录的基础上,开展构造(蚀变岩)地球化学研究,通过R型聚类分析和因子分析得到3组矿化元素组合,结合矿床地质特征, F1(Ag、Cu、Au、In、Se、S、Co、Fe、Zn、K、Ba、LREE、HREE)为Cu-Au矿化元素组合, F3(Rb、Be、Nb、Ta、Th、U、Mo、Re、LREE)为Mo-Re矿化元素组合, F4(Cu、Au、Se、Mo、-Ca、-Sr)为Cu-Au-Mo矿化元素组合。构造(蚀变岩)地球化学异常特征表明:(1)F1、F3、F4因子在浅部的异常与已知矿体位置基本一致,深部未封闭异常指示剖面深部东侧具有较好找矿潜力,可圈定有利找矿靶区;(2)同时出现了两组Cu-Au矿化和两组Mo矿化组合异常叠加,指示具叠加成矿作用特征;(3)根据异常特征和空间叠置规律,结合主矿体产状特征(总体走向NNW,倾向NEE)和蚀变分带规律,推测了成矿流体运移方向(走向由SSE→NNW,倾向上由北东东深部→南西西浅部运移)和矿体展布特征,并在5线、8线、12线开展靶区验证工作,取得较好找矿效果。综合构造-蚀变-构造(蚀变岩)地球化学异常特征,能够有效的预测深边部找矿信息,在斑岩型铜矿深边部找矿过程中具有较好的应用前景,为构造(蚀变岩)地球化学服务深边部找矿提供了新思路和范例。As the most significant porphyry Cu-Au-Mo deposit in the Geza island arc,the occurrence of the main orebody of the Pulang porphyry copper deposit is closely related to the composite porphyry intrusion,the intensity of structural fracture development,and the potassic and propylitic alteration surrounding the magmatic intrusion.These features provide the basis for an effective application of tectonic geochemical exploration techniques.Based on the tectonic,alteration,and mineralization logging of the Line 8 section in the initial mining area,the tectonic(alteration)geochemical characteristics of the Pulang porphyry copper deposit were investigated.Through R-type cluster analysis and factor analysis,combined with the geological characteristics of the deposit,three ore metal element assemblages were determined,namely F1(Ag,Cu,Au、In,Se、S,Co,Fe,Zn,K,Ba,LREE,HREE)copper-gold ore metal element assemblages,F3(Rb,Be,Nb,Ta,Th,U,Mo,Re,LREE)molybdenum-rhenium ore metal element assemblages,and F4(Cu,Au,Se,Mo,-Ca,-Sr)copper-gold-molybdenum ore metal element assemblages.The tectonic(alteration)geochemical anomalies indicate that,(1)The F_(1),F_(3),and F_(4) sub-surface anomalies are generally consistent with the proven orebodies.Unconfined anomalies at depth indicate that the section has promising potential and can be considered as a preferred target;(2)The superimposition of copper-gold and copper-molybdenum mineralization anomalies indicates the possibility of superimposed mineralization;(3)Based on the anomalous features and spatial pattern,combined with the occurrence of the main ore body and alteration zonation,it is suggested that the ore-forming fluids were transported from SSE→NNW horizontally and NEE(deep)→SWW(shallow)vertically.The results of this study were validated in the target areas of the Line 5,Line 8 and Line 12,and achieved good results in prospecting.In summary,the inferred mineralization targets and potential mineralized sections based on the integrated tectonic(alteration)geochemical anomalies have

关 键 词：普朗铜矿 找矿预测 构造地球化学 斑岩矿床 滇西北 

分 类 号：P612[天文地球—矿床学]