摘要
老湾金矿带位于秦岭—桐柏—大别造山带中部,是近年来发现的超大型金矿床。为进一步探索深部第二找矿空间,实施了老湾金矿3006.42 m科学钻探。钻探穿透地表花岗岩后在深部又发现隐伏花岗岩体,两岩体在空间上毗邻,通过元素统计分析方法对两岩体进行了元素丰度及分布特征、相关性分析、R型聚类分析和因子分析研究,发现老湾花岗岩和老湾隐伏花岗岩的元素丰度均高于中国二长花岗岩的平均值,且老湾隐伏花岗岩体明显高于老湾花岗岩体。两岩体具有不同的元素组合特征,老湾花岗岩的元素分布较均匀,而老湾隐伏花岗岩的元素分布离散程度较悬殊且Au、W、Mo局部高度富集,具备形成钼钨矿(化)体的条件。老湾隐伏花岗岩的Au、Bi具有高度相关性,受同一地质因子控制,并具有幔源成因特点,表明老湾隐伏花岗岩与金成矿关系密切,为老湾地区金成矿提供了物质来源。老湾金矿是处在秦岭—大别造山带构造背景下,受早白垩世大规模岩浆活动影响的产物,深源幔源岩浆热液为金成矿提供了主要的金铋物质来源及流体。
Laowan Gold Deposit located in the west of Tongbai-Dabie orogenic belt,is a super-large gold deposit discovered recently.In order to further explore the second deep prospecting space,3006.42 m scientific drilling was carried out in Laowan Gold Deposit.After the ultra-deep drilling penetrates the surface granite,hidden granites are found in the deep.Two granites are adjacent to each other in space.Element combination characteristics of two granites are studied by the method of element statistical analysis.Element abundance and distribution characteristics,correlation analysis,R-type cluster analysis and factor analysis results indicate that Laowan granite and Laowan concealed granite have different element assemblage characteristics.Laowan concealed granite is of mantle origin.The element abundance of two granites is higher than the average value of monzogranite in China.The element distribution of Laowan granite is relatively uniform,while that of Laowan concealed granite is uneven,and Au,W and Mo are highly enriched locally,forming molybdenum and tungsten orebodies.Au and Bi of Laowan concealed granite are highly correlated and controlled by the same geological factors.Laowan gold orebody also has the same element characteristics,indicating that Laowan concealed granite is closely related to gold mineralization and provides material source for gold mineralization in Laowan area.Laowan Gold Deposit is a product of large-scale magmatic activity in the Early Cretaceous under the tectonic setting of Qinling-Dabie orogenic belt.The deep mantle-derived magmatic hydrothermal fluid provides the main gold-bismuth source and fluid for gold mineralization.
作者
陈建立
郭鹏
陈英男
赵焕
魏从玲
CHEN Jianli;GUO Peng;CHEN Yingnan;ZHAO Huan;WEI Congling(The First Geological Exploration Institute of Henan Provincial Bureau of Geo-exploration and Mineral Development,Zhengzhou 450001,China;School of Earth Sciences,Guilin University of Technology,Guilin 541004,China;Guilin University of Technology,Hidden Metal Mineral Exploration Key Laboratory of Guangxi,Guilin 541004,China;Henan Insitiute of Geological Survey,Zhengzhou 450001,China)
出处
《金属矿山》
CAS
北大核心
2023年第1期259-268,共10页
Metal Mine
基金
河南省地质勘查基金项目(编号:豫自然资发[2020]18-14)
河南省地质矿产勘查开发局地质科研项目(编号:豫地矿[2022]06号)
河南省地质矿产勘查开发局地质科研项目(编号:豫地矿科研[2021]Z-14号)。
关键词
科学钻探
老湾(隐伏)花岗岩
元素组合特征
成矿机制
秦岭—大别造山带
scientific drilling
Laowan(concealed)granite
element assemblage characteristics
metallogenic mechanism
Qinling-Dabie orogenic belt
作者简介
陈建立(1966-),男,正高级工程师。
