南秦岭安康成矿带金矿地质特征与成矿条件研究
Study on geological characteristics and metallogenic conditions of gold deposits in Ankang metallogenic belt,South Qinling Mountains
张炜1
作者信息
- 1. 甘肃省地质调查院,甘肃 兰州 730000
- 折叠
摘要
安康金成矿远景区位处南秦岭安康成矿带,区内赋矿层位为志留系下统斑鸠关组、梅子垭组,受北西西—南东东向展布的叶坪河复式向斜构造控制,成矿类型属沉积改造型.岩石地球化学分析表明,Au元素在各地层的平均质量分数值范围为1.19×10-9～6.68×10-9,而经后期变质改造的各地层中(含矿层片岩类),Au元素的质量分数值升高,各变质地层Au元素的质量分数值范围为 255×10-9～711×10-9,平均值的范围为 23.06×10-9～26.52×10-9,具找矿前景,是勘查区内主要的找矿目标.认为地层岩性、构造特征、围岩蚀变、化探异常可作为该区域金矿床找矿的标志.
Abstract
The prospective location of Ankang gold mineralization is located in the Ankang metallogenic belt of the South Qinling Mountains.The ore-bearing horizon in the area is the Lower Silurian Zejiuguan Formation and Meizya Formation,which is controlled by the Yepinghe complex syncline structure spreading from northwest to southeast.The ore-forming type belongs to the sedimentary transformation type.The geochemical analysis shows that the average mass fraction of Au in different layers ranges from 1.19×10-9 to 6.68×10-9.The mass fraction value of Au element increased in the strata(ore-bearing schist)after the late metamorphic transformation,and the mass fraction value of Au element in each metamorphic strata ranged from 255×10-9 to 711×10-9,with an average value of 23.06×10-9 to 26.52×10-9,which has prospecting prospect and is the main prospecting target in the exploration area.It is considered that the stratigraphic lithology,structural characteristics,alteration of surrounding rock and geochemical anomaly can be used as the indication of gold deposit prospecting in this area.
关键词
南秦岭/安康成矿带/地质特征/成矿条件Key words
South Qinling Mountains/Ankang metallogenic belt/geological characteristics/metallogenic condition引用本文复制引用
出版年
2024
NETL
NSTL
万方数据