摘要
陕西省镇安县金龙山金矿是产于南秦岭印支褶皱带中的微细浸染型金矿,上泥盆统南羊山组(D3n)细碎屑岩-碳酸盐岩既是金龙山矿区的容矿地层,又是金等成矿物质的矿源层。金矿脉的产出主要受断裂构造控制,尤其NE向的断裂构造控制了金龙山金矿绝大多数的矿脉产出。在金龙山金矿区金龙山矿段106号金矿脉应用EH4连续电导率仪成功区分出了两种不同的岩性,并识别出了3条与成矿有关的断裂构造。测区内灰岩表现为高阻异常特征,页岩表现为低阻异常特征。近EW走向的断裂构造Fa为测区内规模最大的断裂构造,深部延伸较深;NE向的断裂构造Fb与Fc近平行产出,并且深部均与Fa交汇,其中Fb为106号金矿脉所处断裂构造,而Fc为测区内一条锑矿脉所处的断裂构造。Fa断裂与区域上EW走向的深大断裂倾向一致,为SN向推覆过程中形成的,在成矿过程中为成矿热液提供运移通道;NE向断裂Fb与Fc具有容矿条件,推测应为张性断裂。
The Jinlong Shan gold deposit is of the Carlin-type,which occurs in the Indosinian fold belt of the South Qin Ling Mountains in Zhen'an country,Shaanxi Province. The upper Devonian Nanyangshan Formation fine-grained clastic rocks and carbonate rocks are main ore-hosting beds and source layers. The occurrence of gold veins is controlled by fault structures,especially the NE-trending faults which determine the majority of Au veins in the Jinlong Shan gold deposit. The application of the EH4 continuous conductivity meter on the No. 106 Au vein of Jinlong Shan gold deposit has successfully distinguished two types of rocks and three faults,named Fa,Fb,and Fc,respectively,which are related to the formation of the gold deposit. The limestone in the study area exhibits high resistivity,while shale shows low resistivity. The nearly EW-trending fault structure Fa is the biggest one in the study area and extends downwards to a large depth. The NE-trending fault Fb lies parallel to the fault Fc,all of which intersect with Fa at depth. Fb is the fault where the No. 106 Au vein is located,and Fc is the fault where another vein is situated in the study area. The fault Fa is consistent with the other EW-trending faults in dipping direction in the region,which was formed during NS overthrusting and provided the channel for mineralization hydrothermal solution. The NE trending faults Fb and Fc are the ore-bearing structure,presumably of extensional nature.
出处
《地质与勘探》
CAS
CSCD
北大核心
2014年第3期564-571,共8页
Geology and Exploration
基金
武警黄金指挥部黄金专项项目(编号HJ09-07-1)
国土资源部公益性行业科研专项经费项目(编号:201411048)
中国地质调查局基础调查与综合研究项目(编号:12011220663)
整装勘查区综合研究项目(编号:12120114050201)资助
关键词
EH4
电法勘查
金龙山金矿
陕西镇安
EH4,conductivity prospecting,Jinlongshan gold deposit,Zhen'an of Shaanxi
