地质学报Issue(4)：507-518,12.
安徽沙溪铜矿区域重磁三维反演与找矿启示
Prospecting Indicator of Anhui Shaxi Porphyry Copper Deposit Based on Regional Gravity and Magnetic 3D Inversion
摘要
Abstract
Shaxiporphyry copper-gold deposit located in Lujiang county where named as Luzong (Lujiang-Zongyang)ore concentrate district,Anhui province,east China.This deposit is the most typical Mesozoic porphyry copper-gold deposit in the middle and lower reaches of Yangtze River.In order to expand scale of the deposit,it ’s necessary to research metallogenic background to understand ore-control factor and metallogenic characteristics,and then provide basical information for mineral exploration.Quartz diorite porphyry is the main ore bearing pluton in Shaxi deposit,so mapping the three-dimensional space distribution of the pluton is a key step for prospecting.Based on the 3D inversion of gravity and magnetic, we tried the lithology recognition and successfully portrays the three-dimensional morphology of four main types of pluton include ore bearing quartz diorite porphyry,biotite monzonite,quartz diorite porphyry and diorite,and we also speculated a canceled mechanism of the volcano.Analysis with magnetotelluric data,we think the formation of Shaxi intrusion complex have more closely relation with deep fault on its west side,maybe have no direct relation with the formation of Luzong volconic basin.It also proved that Shaxi porphyry copper-gold deposit and Luzong porphyrite iron deposit is not the same metallogenic system.Although copper ore can’t generate stronger gravity and magnetic anomaly,but gravity and magnetic data can provide intrusion information to realize prospecting indirectly.According gravity and magnetic 3D inversion and Audio Magnetotelluric results,we find that ore bearing quartz diorite porphyry can character as low magnetic, low density and high resistivity,so where low magnetic and gravity anomalies in surface,low magnetic body near high density body in 3D inversion model and high resistivity in Audio Magnetoteluric survey are mostly area for mineral exploration.Integrate geophysics exploration and geological interpretation,we believe that the deep part one the west of Shaxi main ore zone,Shahu mountain and Xijiadun which one the east of Fengtai mountain are favorable targets for porphyry copper gold deposit.关键词
沙溪铜矿/重磁/三维反演/成矿背景/找矿预测Key words
Shaxi porphyry copper/gravity and magnetic/3-D inversion/metallogenic background/exploration prediction引用本文复制引用
严加永,吕庆田,吴明安,陈向斌,张昆,祁光..安徽沙溪铜矿区域重磁三维反演与找矿启示[J].地质学报,2014,(4):507-518,12.基金项目
本文受国家“深部探测技术与实验研究专项（SinoProbe）”第3项目“深部矿产资源立体探测技术及实验研究”第04课题（SinoProbe-03-04）、国家自然科学基金基金项目（41104061，40930418）资助。 （）
