广西砂子岭银多金属矿矿床地质特征及成矿规律
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摘要
本文通过区域地质背景、矿区地质特征概况、矿床地质特征的分析研究,总结矿区内银多金属矿床的成矿规律。结果表明,矿体展布主要受石英斑岩的断层破碎带构造控制;石英斑岩体为银矿体的主要矿源体;石英斑岩岩浆的侵入在粉砂岩、含泥粉砂岩与角闪黑云石英二长岩体沉积接触的地质界面中,这种封闭构造环境中利于富集形成高品位的银矿石;矿化富集用与不同构造的交叉、构造形变强度、岩石破碎强度以及蚀变交代强烈程度等因素密切相关。可将石英斑岩的断层破碎带及接触蚀变带作为银多金属矿找矿方向。石英斑岩断层破碎带中的硅化、黄铁矿化、褐铁矿化、绿泥石化蚀变,是该区银矿找矿的一种地表直接标志。
In this paper,the metallogenic regularity of Ag-polymetallic deposit in the mining area is summarized through the analysis of the regional geological setting,geological characteristics of the mining area and deposit geology features.The result shows that the orebody distribution is mainly controlled by the fault broken zone of quartz porphyry,and that the quartz porphyry is the main source of silver orebody.For the intrusion of quartz porphyry magma in the geological boundary between silty sandstone,argillaceous silty sandstone and hornblende-biotite-quartz monzonitic granite,the high-grade silver ores are formed in this closed tectonic environment.The mineralization enrichment is closely related with the crossing of different structures,the structural deformation intensity,the rock crushing strength and the alteration and replacement intensity and other factors.The fault zone and contact alteration zone of quartz porphyry can be used as the prospecting direction of silver polymetallic ore deposit.Silicification,pyrite mineralization,limonitization and chloritization alteration in the fault zone of quartz porphyry are all the direct surface signs of silver mineralization exploration in the area.
In this paper,the metallogenic regularity of Ag-polymetallic deposit in the mining area is summarized through the analysis of the regional geological setting,geological characteristics of the mining area and deposit geology features.The result shows that the orebody distribution is mainly controlled by the fault broken zone of quartz porphyry,and that the quartz porphyry is the main source of silver orebody.For the intrusion of quartz porphyry magma in the geological boundary between silty sandstone,argillaceous silty sandstone and hornblende-biotite-quartz monzonitic granite,the high-grade silver ores are formed in this closed tectonic environment.The mineralization enrichment is closely related with the crossing of different structures,the structural deformation intensity,the rock crushing strength and the alteration and replacement intensity and other factors.The fault zone and contact alteration zone of quartz porphyry can be used as the prospecting direction of silver polymetallic ore deposit.Silicification,pyrite mineralization,limonitization and chloritization alteration in the fault zone of quartz porphyry are all the direct surface signs of silver mineralization exploration in the area.
引文
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[2]张继淹,廖庆康,金振威,等.广西壮族自治区区域地质志[M].北京:地质出版社,1985.
[3]刘腾飞.广西云开地区金银矿成矿地质特征及找矿远景[J].广西地质,1997(3):15-22.
[4]韩喜彬,梁金城,冯左海,等.桂东南地区断裂构造分析特征与金银成矿关系研究[J].广西科学,2003,10(2):117-121.
[5]付伟,柴明春,杨启军,等.广西佛子冲大型铅锌多金属矿床的成因:流体包裹体和H-O-S-Pb同位素地球化学约束[J].岩石学报,2013,29(12):4136-4150.
[6]柴明春,付伟,韦龙明,等.广西博白-岑溪断陷带中生代流体活动与铅锌成矿作用[J].地质论评,2013,59(增刊1):468-469.
[7]罗嶂.广西博白-岑溪断裂带地特征与构造演化[J].广西地质,1990(1):25-33.
[8]翟裕生,吕古贤.构造动力体制转换与成矿作用[J].地球学报,2002,23(2):97-102.
[9]冯左海,梁金城.桂东南南渡-莲塘岩体的应变测量与应变特征[J].大地构造与成矿学,1996,20(2):172-183.
[10]李江,陆济璞,康云骥.广西杨梅幅、水汶幅等1∶5万区域地质调查报告[R].1995.