内蒙古扎兰屯哈拉河银铜铅锌矿围岩蚀变与矿化作用
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摘要
哈拉河银铜铅锌矿为内蒙古扎兰屯地区新发现的斑岩型矿床,斑岩体为钙碱性花岗闪长斑岩。围绕侵入岩体,围岩蚀变强烈。围岩蚀变与矿化作用关系的研究是斑岩矿床成矿过程研究的一项重要内容。对围岩蚀变类型、蚀变矿物组合以及蚀变类型与矿化体品位变化关系进行了研究。结果显示:哈拉河矿区内围岩蚀变类型主要有钾长石化、绢云母化、硅化、绿泥石化、绿帘石化和碳酸盐化等;蚀变分带比较明显,由深至浅依次为钾长石化带、绢英岩化带和青磐岩化带;区内蚀变与矿化关系密切,蚀变类型决定矿化类型和矿化强度,银矿化主要发育青磐岩化带内,铜铅锌矿化主要产在绢英岩化带内。
Halahe Ag-Cu-Pb-Zn deposit is a porphyry-type deposit newly discovered in Zhalantun,Inner Mongolia,the lithology of the host intrusion is calc-alkali granodiorite porphyry. In the ore field surrounding the intrusive rock mass,the wall rocks alteration is strong. Studying the relationship between wall rock alteration and mineralization is important for the study on the mineralization of porphyry-type deposits. In this study,wall rock alteration type,alteration mineral assemblage,and the relationship between alteration type and the change of orebody grade of the deposit were studied. The result of the study showed that the wall rock alteration types in the Halahe mining area mainly include the potash feldspathization,sericitization,silicification,chloritization,epidotization and carbonatization. There are exist obvious alteration zoning of the wall rocks,from the deep to the shallow,they respectively are belt of the potash feldspathization,belt of sericitization-silicification,and the prophylitic zone. There is a closely relationship between the wall rocks alteration and the mineralization in this area,the type of alteration correspond to a certain type of mineralization and mineralization intensity. The silver mineralization mainly occured in the prophylitic zone,and the Cu-Pb-Zn mineralization mainly occured in the belt of sericitization-silicification.
Halahe Ag-Cu-Pb-Zn deposit is a porphyry-type deposit newly discovered in Zhalantun,Inner Mongolia,the lithology of the host intrusion is calc-alkali granodiorite porphyry. In the ore field surrounding the intrusive rock mass,the wall rocks alteration is strong. Studying the relationship between wall rock alteration and mineralization is important for the study on the mineralization of porphyry-type deposits. In this study,wall rock alteration type,alteration mineral assemblage,and the relationship between alteration type and the change of orebody grade of the deposit were studied. The result of the study showed that the wall rock alteration types in the Halahe mining area mainly include the potash feldspathization,sericitization,silicification,chloritization,epidotization and carbonatization. There are exist obvious alteration zoning of the wall rocks,from the deep to the shallow,they respectively are belt of the potash feldspathization,belt of sericitization-silicification,and the prophylitic zone. There is a closely relationship between the wall rocks alteration and the mineralization in this area,the type of alteration correspond to a certain type of mineralization and mineralization intensity. The silver mineralization mainly occured in the prophylitic zone,and the Cu-Pb-Zn mineralization mainly occured in the belt of sericitization-silicification.
引文
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[4]王筱筝,吕骏超,胥嘉,等.黑龙江六九山铜银矿床地质特征[J].地质与资源,2016,25(2):137-143.
[5]耿文辉,姚金炎.内蒙古东部闹牛山铜矿成矿地质背景分析[J].矿产与地质,2004,18(3):240-244.
[6]潘建,常立海,王嵩莉,等.牙克石市翠干公路岭上铅锌钼多金属矿床地质特征简述[J].吉林地质,2012,31(1):49-54.
[7]岳紫龙,杜杨松,曹毅,等.安徽铜陵桂花冲斑岩铜矿围岩蚀变与矿化作用[J].现代地质,2016,30(1):50-58.
[8]佘宏全,李红红,李进文,等.内蒙古大兴安岭中北段铜铅锌金银多金属矿床成矿规律与找矿方向[J].地质学报,2009,83(10):1456-1472.
[9]李伟,司秋亮,唐振,等.内蒙古1∶5万大呼勒气沟、萨马街、干沟子、王巴脖子幅区域地质调查[R].中国地质调查局沈阳地质调查中心,2015.
[10]刘波,乔宝成,李海东.综合物化探方法在哈拉河铅锌矿区勘查中的应用[J].物探与化探,2014,38(2):261-267,277.
[11]姜永果,吴静,李峰,等.云南香格里拉春都斑岩铜矿区围岩蚀变及矿化特征[J].地质与勘探,2011,47(6):1107-1113.
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