摘要
白龙江复式背斜是南秦岭重要的金成矿带,本文基于航磁异常对白龙江复式背斜构造演化与金成矿关系进行了探讨。通过航磁异常特征分析,将白龙江复式背斜由断裂分为“南北分带、东西分块”的格架;在空间分布上,白龙江复式背斜金矿主要分布在拉尔玛和洛大地区受尼日—马热松多大断裂控制的隐伏辉绿岩范围内;早期辉绿岩体的侵入完成了成矿元素的初步富集,后期中酸性岩体的侵入完成了成矿元素的第二次、第三次富集;金矿找矿有利部位为航磁异常解译的西、东两端的占哇和洛大隐伏辉绿岩岩床范围,次为中部岗藏、葱地两处隐伏辉绿岩体范围。航磁异常可作为该区域重要的找矿标志。
The Bailongjiang complex anticline is an important gold metallogenic belt in the South Qinling Mountains.Based on aeromagnetic anomalies,the relationship between the evolution of Bailongjiang complex anticline and gold metallogenic is discussed in this paper.Through the analysis of aeromagnetic anomaly characteristics,the Bailongjiang complex anticline is divided into a framework of"north-south zoning and east-west segmentation"by faults.In terms of spatial distribution,Bailongjiang complex anticlinal gold deposit is mainly distributed in Laerma and Luoda area,with in the hidden diabase range controlled by the Niri-Maresongduo Fault.The early-stageintrusion of diabase formations led to the initial enrichment of ore-forming elements,while the later-stageintrusion of acidic rock formations further enriched these elements for the second and third time.The favorable locations for gold deposits are the hidden diabase bed ranges of Zhanwa and Luoda at the western and eastern ends of aeromagnetic anomalies area,and the hidden diabase rock range of central Gangzang and Congdi are considered as secondary favorable sites for gold prospecting.Aeromagnetic anomalies can be used as an important mineral prospecting indicator in this area.
作者
胥溢
XU Yi(The Second Geological and Mineral Exploration Institute of Gansu Provincial Bureau of Geology and Mineral Exploration and Development,Lanzhou 730020,Gansu,China)
出处
《资源信息与工程》
2023年第4期14-17,共4页
Resource Information and Engineering
关键词
白龙江复式背斜
微细浸染型金矿
航磁异常
Bailongjiang complex anticline
finely disseminated gold deposit
aeromagnetic anomaly
