西北地质2025，Vol.58Issue(3)：97-107,11.DOI:10.12401/j.nwg.2024101
东天山红石岗南地区隐伏地质体磁异常特征及其找矿指示
Characteristics of Magnetic Anomalies and Geological Significance in the Southern Hongshigang Area of the Eastern Tianshan Mountains,China
摘要
Abstract
In recent years,the emphasis of metal mineral exploration has gradually shifted to the hidden de-posits in the covered areas where the rock mass is not exposed.However,it is difficult to obtain the information of underground abnormal bodies in the early investigation work because of the thick overlying layer.The Mafic and ultramafic rock mass outlying in the Hongshigang area of the Eastern Tianshan Cu-Ni metallogenic belt shows good prospecting potential.The 1∶50 000 aeromagnetic data and gravity data show that there is a high magnetic and high gravity coupling anomaly in the southern Quaternary covered area,which has not been inves-tigated yet.Therefore,this study conducted high-precision ground magnetic survey work in the southern Hong-shigang area and used magnetic anomaly reduced to the pole,vertical first derivative,normalized total gradient method,two-dimensional profile simulation,and three-dimensional magnetic anomaly inversion methods to con-duct preliminary exploration and research on the underground anomalous bodies in the area.It was found that there are five significant magnetic anomalies in the investigation area,and the average magnetic susceptibility of the hidden anomalous bodies is about 6 000×10-5 SI,with a depth of about 200-300 meters.There are five main small anomalous bodies,which strike nearly southwest-northeast and dip to the north.Combined with geologi-cal data and rock physical properties,the anomalous bodies in this area may be mafic and ultramafic rock bodies with high magnetic susceptibility.Magnetic anomalies are used to indicate the Huangshan-Jingerquan faults in the southwest-northeast direction which are consistent with the inferred position of predecessors and the sec-ondary fault in the investigated area,which could provide a favorable metallogenic environment for copper-nick-el deposits.Therefore,the underground anomalous bodies in the southern Hongshigang area have great prospect-ing potential for copper-nickel deposits,and this study provides reliable geophysical data for subsequent explo-ration work in the area.关键词
磁法勘探/隐伏异常体/二维剖面模拟/三维反演/红石岗南Key words
magnetic prospecting/underground anomalous bodies/two-dimensional profile simulation/three-dimensional inversion/southern Hongshigang分类
地质学引用本文复制引用
刘隆,杜辉,唐小平,刘生荣,王亚磊,荆德龙,李倩宇..东天山红石岗南地区隐伏地质体磁异常特征及其找矿指示[J].西北地质,2025,58(3):97-107,11.基金项目
中国地质调查局项目"西北地区区域地球物理调查"(DD20243470)、"天山-北山成矿带战略性矿产调查"(DD20240074),陕西省自然科学青年基金"含起伏地表模型2.5D逆时偏移成像及其在渭河盆地氦气勘探中的应用"(2202JQ-241)联合资助. （DD20243470）
