平泉县洼子店金矿区碾子沟矿段矿床地质特征
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摘要
本文通过分析平泉县洼子店金矿区碾子沟矿段的成矿地质条件,认为Cu、Pb、Zn、Au、Ag矿化与围岩关联不明显,而与构造有密切关系,岩体内异常组合Mo、Bi、W、Mn、Hg、Au、Cu、Ag主成矿元素与Au、Cu相关性较高,激电异常峰值较明显的点异常由埋藏较浅的隐伏矿体所引起。矿化特征主要为细脉浸染状金(铜)矿化、接触带上金(银)矿化、斑岩中的浸染状金矿化以及地表风化残积型金矿化;矿体似层状,稳定;以黄铁矿为主,呈具自形-半自形-它形粒状结构、交代结构、填隙结构、碎裂结构等结构,以浸染状构造为主,有益、有害元素含量均微少。经历了早期磁铁矿-钛铁矿阶段,热液活动的黄铁矿阶段,形成以黄铜矿-方铅矿-闪锌矿为主,伴生少量辉铜矿、砷黝铜矿为主的硫化物阶段,之后形成细脉状、浸染状硫化物矿石,在压扭性构造活动期下,构造热液使岩石发生蚀变并伴有金矿形成。
Based on the analysis of the metallogenic geological conditions of the ore section,it is considered that the mineralization of Cu,Pb,Zn,Au and Ag is not related to the surrounding rock,but closely related to the structure.The main metallogenic elements of the anomalous assemblage Mo,Bi,W,Mn,Hg,Au,Cu and Ag in the rock mass are highly correlated with Au and Cu.The point anomaly with obvious peak value of IP anomaly is caused by the buried shallow concealed ore body.Mineralization is characterized by veinlet disseminated gold(copper)mineralization,contacted zone gold(silver)mineralization,disseminated gold mineralization in porphyry and surface weathering residual gold mineralization;ore bodies are layered and stable;pyrite is the dominant mineral with automorphic-semi-automorphic-isomorphic granular structure,metasomatic structure,filling structure and fragmental structure,and disseminated structure is the dominant one,which is beneficial and useful.The content of harmful elements is slight.After the early magnetiteilmenite stage and the hydrothermal pyrite stage,chalcopyrite-galena-sphalerite is formed,accompanied by a small amount of chalcopyrite and arsenopyrite-dominated sulfide stage,and then veinlet and disseminated sulfide ores are formed.During the compressive-torsional tectonic active stage,the tectonic hydrothermal fluid altered the rock and accompanied by the formation of gold deposits.
Based on the analysis of the metallogenic geological conditions of the ore section,it is considered that the mineralization of Cu,Pb,Zn,Au and Ag is not related to the surrounding rock,but closely related to the structure.The main metallogenic elements of the anomalous assemblage Mo,Bi,W,Mn,Hg,Au,Cu and Ag in the rock mass are highly correlated with Au and Cu.The point anomaly with obvious peak value of IP anomaly is caused by the buried shallow concealed ore body.Mineralization is characterized by veinlet disseminated gold(copper)mineralization,contacted zone gold(silver)mineralization,disseminated gold mineralization in porphyry and surface weathering residual gold mineralization;ore bodies are layered and stable;pyrite is the dominant mineral with automorphic-semi-automorphic-isomorphic granular structure,metasomatic structure,filling structure and fragmental structure,and disseminated structure is the dominant one,which is beneficial and useful.The content of harmful elements is slight.After the early magnetiteilmenite stage and the hydrothermal pyrite stage,chalcopyrite-galena-sphalerite is formed,accompanied by a small amount of chalcopyrite and arsenopyrite-dominated sulfide stage,and then veinlet and disseminated sulfide ores are formed.During the compressive-torsional tectonic active stage,the tectonic hydrothermal fluid altered the rock and accompanied by the formation of gold deposits.
引文
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[3]魏景瑞.河北平泉卧龙岗深部矿体预测[J].科协论坛:下半月,2009(2):98-99.WEI Jingrui.Prediction of deep orebody in Wolonggang,Pingquan,Hebei province[J].Science&Technology Association Forum,2009(2):98-99.
[4]刘锡文.浅谈冀东北地区的大地构造演化规律与金矿成矿规律[J].大地构造与成矿学,1992,16(4):355-365.LIU Xiwen.Discussion on the Tectonic evolution and gold mineralization of northeast Hebei province[J].Geotectonica et Metallogenia,1992,16(4):355-365.
[5]邵洁涟,梅建明.河北平泉某次火山型金矿床的黄铁矿研究[J].黄金,1984(5):1-6.SHAO Jielian,MEI Jianming.Study on pyrite of a volcanic gold deposit in Pingquan,Hebei province[J].Gold,1984(5):1-6.
[6]刘锡文.冀东北热液金矿控矿因素分析及其找矿方向的厘定[J].大地构造与成矿学,1987,11(2):167-174.LIU Xiwen.Controls of mineralization and trend in searching for gold mineral deposits in northeastern Hebei province[J].Geotectonica et Metalloginia,1987,11(2):167-174.
[7]河北省地质局第十地质队.河北省平泉县洼子店矿区金多金属矿区普查地质报告[R].2000.
[8]李京.冀东地区金矿地质特征及其成因[J].地质与勘探,1988(1):5-8.LI Jing.Geological features and genesis of gold deposits in eastern Hebei province[J].Geology and Exploration,1988(1):5-8
[9]许桂玲,许绍忠,张玉华.冀北金矿的地质特征及找矿方向[J].黄金地质,1995(4):13-18.XU Guiling,XU Shaozhong,ZHANG Yuhua.Geologic features and prospecting guidelines for gold deposits in northern Hebei[J].Gold Geology,1995(4):13-18.
[10]郗爱华,刘鹏鹗.河北省碾子沟金矿成矿远景评价[J].黄金,1996(4):8-12.XI Aihua,LIU Peng'e.The evaluation of the vista of gold metallization of Nianzigou gold deposit,Hebei province[J].Gold,1996(4):8-12.