豫西洛宁县老里湾银矿和嵩县中营铅矿地质特征及找矿方向
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摘要
豫西地区为金、钼钨、银铅锌矿集区,经历了近50 a未间断的矿产勘查工作,近期仍在中—新生代盆地边缘查明了洛宁县老里湾大型银矿和嵩县中营大型铅矿等斑岩型矿床。结合相关地质勘探成果,详细分析了两者地质特征、矿床成因及找矿方向。研究表明:(1)老里湾银矿赋存于早白垩世第二期花岗斑岩体内,岩石具有多斑状结构,中营铅矿赋存于早白垩世第二期隐伏黑云母斑状花岗岩体上方的青磐岩化带,花岗岩呈似斑状结构,两类岩体的共同特点是基质和斜长石斑晶具有绢云母-高岭石化,成矿的共同特征是细脉状、浸染状大范围矿化,两者为一对分处岩体内外的斑岩型矿床;(2)按照透岩浆流体成矿作用理论,矿床成因为来自岩浆源区熔融残余的含矿流体再注入岩体,或透过岩体成矿于岩体上方;(3)豫西地区的成矿分带以金矿集区为中心,向外、向上依次为钼、银铅锌、铅锌、重晶石、萤石矿,中—新生代山间盆地保存了居于成矿分带上部位置的银铅锌矿,因而在豫西地区有关5个盆地的边缘和小秦岭金矿田南侧的Mo-Pb-Zn-Ag等综合异常区寻找银铅锌矿具有较大的找矿空间;(4)由于覆盖层的存在,以往水系沉积物地球化学测量和多目标土壤地球化学测量均未在中—新生代盆地边缘圈出有关异常,矿床的重力、磁场特征也被区域重力低场和长城系火山岩的跳跃磁场所掩盖,矿区下一步找矿需要试验新的具有一定穿透能力的物化探方法。
Western Henan Province is a Au,Mo-W,Pb-Zn-Ag ore accumulated area. It has experienced nearly 50 years of uninterrupted mineral exploration work. Laoliwan large silver deposit in Luoning County and Zhongying large lead deposit in Song County have been found in the edge of Meso-Cenozoic Basin. Based on the geological and exploration results of the area,the geological characteristics of Laoliwan silver deposit and Zhongying lead deposit are discussed,and the deposit genesis and prospecting directions of them are also analyzed ind detail. The study results show that:(1)Laoliwan silver deposit is existed in the second phase of Early Cretaceous granite porphyry rock mass,which with multi porphyritic texture,Zhongying lead deposit is existed in propylitization belt,that is distributed on the second phase of Early Cretaceous concealed biotite porphyritic granite rock mass,the structure of the granite is porphyriticlike texture,the common feature of the granites is the sericitization-kaolinization in matrix and plagioclase phenocryst,and the common characteristics of ore-forming is veinlet and disseminated mineralization with large scale,the Laoliwan silver deposit and Zhongying lead deposit are a pair of porphyritic deposits inside and outside of the granite rock mass;(2)according to the theory of transmagmatic fluid metallogenesis,the deposit genesis is belongs to the ore-bearing fluid that is derive from the magma source melting reside injecting rock mass again,or the mineralization occurs over the rock mass through the rock mass;(3)the metallogenic zoning of Western Henan Province is centered on gold ore accumulated area,followed by Mo,Ag-Pb-Zn,Pb-Zn,barite,fluorite deposit outward and upward,the Ag-Pb-Zn deposit that is distributed on the upper part of metallogenic zoning that is conserved in Meso-Cenozoic intermountain basin,so there area large exploring spaces in the edge of five basins related to Western Henan Province and Mo-Pb-Zn-Ag comprehensive ore accumulated area in Southern Xiaoqinling gold field to find Ag-Pb-Zn deposit;(4)due to the existence of overburden,any anomaly is not delineated in the edge of Meso-Cenozoic intermountain basin by adopting stream sediment geochemical survey method and multi-objective soil geochemical survey method,besides that,the gravity and magnetic field characteristics of deposit are covered by regional gravity low and the jump magnetic field of Changcheng System volcanic rock,therefore,geophysical-geochemical methods with certain penetration ability should be tested in the further prospecting work of the two mining areas.
Western Henan Province is a Au,Mo-W,Pb-Zn-Ag ore accumulated area. It has experienced nearly 50 years of uninterrupted mineral exploration work. Laoliwan large silver deposit in Luoning County and Zhongying large lead deposit in Song County have been found in the edge of Meso-Cenozoic Basin. Based on the geological and exploration results of the area,the geological characteristics of Laoliwan silver deposit and Zhongying lead deposit are discussed,and the deposit genesis and prospecting directions of them are also analyzed ind detail. The study results show that:(1)Laoliwan silver deposit is existed in the second phase of Early Cretaceous granite porphyry rock mass,which with multi porphyritic texture,Zhongying lead deposit is existed in propylitization belt,that is distributed on the second phase of Early Cretaceous concealed biotite porphyritic granite rock mass,the structure of the granite is porphyriticlike texture,the common feature of the granites is the sericitization-kaolinization in matrix and plagioclase phenocryst,and the common characteristics of ore-forming is veinlet and disseminated mineralization with large scale,the Laoliwan silver deposit and Zhongying lead deposit are a pair of porphyritic deposits inside and outside of the granite rock mass;(2)according to the theory of transmagmatic fluid metallogenesis,the deposit genesis is belongs to the ore-bearing fluid that is derive from the magma source melting reside injecting rock mass again,or the mineralization occurs over the rock mass through the rock mass;(3)the metallogenic zoning of Western Henan Province is centered on gold ore accumulated area,followed by Mo,Ag-Pb-Zn,Pb-Zn,barite,fluorite deposit outward and upward,the Ag-Pb-Zn deposit that is distributed on the upper part of metallogenic zoning that is conserved in Meso-Cenozoic intermountain basin,so there area large exploring spaces in the edge of five basins related to Western Henan Province and Mo-Pb-Zn-Ag comprehensive ore accumulated area in Southern Xiaoqinling gold field to find Ag-Pb-Zn deposit;(4)due to the existence of overburden,any anomaly is not delineated in the edge of Meso-Cenozoic intermountain basin by adopting stream sediment geochemical survey method and multi-objective soil geochemical survey method,besides that,the gravity and magnetic field characteristics of deposit are covered by regional gravity low and the jump magnetic field of Changcheng System volcanic rock,therefore,geophysical-geochemical methods with certain penetration ability should be tested in the further prospecting work of the two mining areas.
引文
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[15]叶会寿,毛景文,李永峰,等.东秦岭东沟超大型斑岩钼矿SHRIMP锆石U-Pb和辉钼矿Re-Os年龄及其地质意义[J].地质学报,2006,80(7):1078-1088.
[16]孟芳,叶会寿,周珂,等.豫西老君山地区钼矿地质特征及辉钼矿Re-Os同位素年龄[J].矿床地质,2012,31(3):480-492.
[17]罗照华,莫宣学,卢欣祥,等.透岩浆流体成矿作用——理论分析与野外证据[J].地学前缘,2007,14(3);165-183.
[18]罗照华,卢欣祥,郭少丰,等.透岩浆流体成矿体系[J].岩石学报,2008,24(12):2669-2678.
[19]罗照华,卢欣祥,许俊玉,等.成矿侵入体的岩石学标志[J].岩石学报,2010,26(8):2247-2254.
[20]林强,葛文春,马瑞,等.地壳岩石的失水熔融实验[J].吉林大学学报(地球科学版),1999,29(3):209-214.
[21]彭翼,张寿庭,燕长海,等.内生金属矿产大比例尺成矿预测及综合勘查技术方法研究[M].武汉:中国地质大学出版社,2015.
[2]毛景文,谢桂青,张作衡,等.中国北方中生代大规模成矿作用的期次及其地球动力学背景[J].岩石学报,2005,21(1):169-188.
[3]肖娥,胡建,张遵忠,等.东秦岭花山复式岩基中蒿坪与金山庙花岗岩体岩石地球化学、锆石U-Pb年代学和Lu-Hf同位素组成[J].岩石学报,2012,28(12):4031-4046.
[4]胡浩,李建威,邓晓东.洛南—卢氏地区与铁铜多金属矿床有关的中酸性侵入岩锆石U-Pb定年及其地质意义[J].矿床地质,2011,30(6):979-1000.
[5]卢仁,二梁涛,卢欣祥,等.豫西崤山龙卧沟岩体锆石U-Pb年代学、地球化学特征及地质意义[J].中国地质,2014,41(3):756-772.
[6]彭翼,何玉良.河南省区域成矿规律[M].武汉:中国地质大学出版社,2015.
[7]李靖辉.河南嵩县大石门沟钼矿床辉钼矿Re-Os同位素年龄及地质意义[J].中国地质,2014,41(4):1364-1374.
[8]曹晶,叶会寿,李洪英,等.河南嵩县黄水庵碳酸岩脉型钼(铅)矿床地质特征及辉钼矿Re-Os同位素年龄[J].矿床地质,2014,33(1):53-69.
[9]王赛,叶会寿,杨永强,等.河南栾川火神庙钼矿床辉钼矿Re-Os同位素年龄及其地质意义[J].地质通报,2014,33(9):1430-1438.
[10]姚军明,赵太平,李晶,等.河南祁雨沟金成矿系统辉钼矿Re-Os年龄和锆石U-Pb年龄及Hf同位素地球化学[J].岩石学报,2009,25(2):374-384.
[11]高亚龙,张江明,叶会寿,等.东秦岭石窑沟斑岩钼矿床地质特征及辉钼矿Re-Os年龄[J].岩石学报,2010,26(3):729-739.
[12]李永峰,毛景文,刘敦一,等.豫西雷门沟斑岩钼矿SHRIMP锆石U-Pb和辉钼矿Re-Os测年及其地质意义[J].地质论评,2005,51(1):122-131.
[13]周珂,叶会寿,毛景文,等.豫西鱼池岭斑岩型钼矿床地质特征及其辉钼矿铼-锇同位素年龄[J].矿床地质,2009,28(2):170-184.
[14]刘军,武广,贾守民,等.豫西沙坡岭钼矿床辉钼矿Re-Os同位素年龄及其地质意义[J].矿物岩石,2011,31(1):56-62.
[15]叶会寿,毛景文,李永峰,等.东秦岭东沟超大型斑岩钼矿SHRIMP锆石U-Pb和辉钼矿Re-Os年龄及其地质意义[J].地质学报,2006,80(7):1078-1088.
[16]孟芳,叶会寿,周珂,等.豫西老君山地区钼矿地质特征及辉钼矿Re-Os同位素年龄[J].矿床地质,2012,31(3):480-492.
[17]罗照华,莫宣学,卢欣祥,等.透岩浆流体成矿作用——理论分析与野外证据[J].地学前缘,2007,14(3);165-183.
[18]罗照华,卢欣祥,郭少丰,等.透岩浆流体成矿体系[J].岩石学报,2008,24(12):2669-2678.
[19]罗照华,卢欣祥,许俊玉,等.成矿侵入体的岩石学标志[J].岩石学报,2010,26(8):2247-2254.
[20]林强,葛文春,马瑞,等.地壳岩石的失水熔融实验[J].吉林大学学报(地球科学版),1999,29(3):209-214.
[21]彭翼,张寿庭,燕长海,等.内生金属矿产大比例尺成矿预测及综合勘查技术方法研究[M].武汉:中国地质大学出版社,2015.