磁法在大兴安岭北段金及多金属找矿中的应用
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摘要
磁法勘探包括地面、航空、海洋磁法勘探及井中磁测等,是最常用的地球物理勘探方法之一,主要用于寻找铁、铅锌、铜多金属等有关矿产,也被用来进行地质填图、研究地质构造等。截止目前,我国大多数铁矿床、多金属矿床及油气田等均开展过大量的磁法勘查工作,并取得良好的找矿效果。磁法勘查也是基本地球物理手段,已纳入国家进行全国范围的系统测量的计划,并且基本覆盖全国各重要地区。
本文依托地调局工作项目和省资源补偿费项目,通过航磁异常筛选与三级、二级异常查证,发现重要的金及铜多金属矿化线索,表明磁法勘查是大兴安岭地区开展金及多金属找矿取得快速突破的有效手段。
工作区地处工作区属额尔古纳—兴安岭成矿带(Ⅱ级成矿区(带),包括额尔古纳成矿区(带)和大兴安岭成矿区(带)两个Ⅲ级成矿区(带),两者之间为寰宇-新林蛇绿混杂岩带。前中生代的地质构造格架为大兴安岭弧盆系(Ⅱ级),其前寒武系构成古老地块的结晶基底或构成多岛弧盆系统的基底杂岩系,早古生界主要由岛弧或弧火山沉积建造组成,晚古生界多为上叠断拗陷盆地沉积建造。中生代以来,受太平洋板块作用的控制,形成漠河前陆盆地和滨太平洋陆缘岩浆弧,叠加于天山—兴蒙造山系之上。在漫长的地质构造演化过程中,壳幔物质能量交换作用活跃,地壳挤压造山收缩作用强烈,构造结合带、推覆构造带(糜棱岩带)、走滑断裂构造发育。
研究区构造—岩浆活动极为发育,金及多金属成矿作用集中产出,系统研究区域航磁异常特征,针对金及多金属矿产勘查开展航磁异常的筛选与查证,对大兴安岭成矿带金及多金属找矿取得突破具有重要意义。
在大兴安岭北部,对圈定的航磁异常进行筛选,选择成矿条件有利的异常,进行三级异常查证；对于三级查证较好的开展二级异常查证。2010年度对黑C-2009-10557号异常进行了三级查证、二级查证和工程揭露,施工了6条探槽。经工程揭露发现岩石中见有孔雀石化,局部硅化、黄铁矿化亦较发育。对TC557-04号异常进行探槽揭露,在其北西端的花岗斑岩局部中见有星点状、团斑状的黄铜矿化矿段。根据基本分析结果,在TC557-04探槽中圈定出3条低品位铜矿体,3条铜矿化带：第一条矿化带宽58.40m,平均Cu品位0.106%,圈出2条宽2.00m的低品位铜矿体；第二条矿化带宽4.00m,平均Cu品位0.116%；第三条矿化带宽14.00m,平均品位0.121%,圈出1条宽1.00m的低品位铜矿体。在TC557-02探槽中圈定出1条低品位铜矿体,2条铜矿化带：第一条矿化带宽15.00m,平均品位0.146%,圈出1条低品位铜矿体,矿体宽4.00m,平均Cu品位0.232%；第二条矿化带宽度为5.00m,平均品位0.112%。在TC557-07号探槽中圈定出5条钼矿化带：第一条矿化带宽2.00m,平均Cu品位0.014%；第二条矿化带宽4.30m,平均Cu品位0.013%；第三条矿化带宽3.00m,平均Cu品位0.012%；第四条矿化带宽3.00m,平均Cu品位0.017%；第五条矿化带宽4.00m,平均品位0.022%。
对C14号航磁异常进行二级、三级异常查证和工程揭露,在10Ht-4异常浓集中心和物探激电浓集中心吻合较好的地段,进行槽探工程揭露,发现金矿化体1条,平均品位0.3．10-6,斜厚lm,赋矿围岩为碎裂花岗岩,具强黄铁矿化、黄铁矿呈浸染状,晶型较完整,大小约0.5mm；具弱硅化、呈弥漫状。(0.1～0.3)×10-6的金矿化6条。上述结果表明,通过航磁异常筛选与查证,有利于快速发现金及多金属矿化带和矿体,是取得找矿突破的重要途径。根据区内已有矿床、矿点、矿化点的资料和2010年查证的160处航磁异常,总结航磁异常筛选的原则、方法和规律,为2011年“黑龙江漠河—塔河地区航空物探异常查证”和“黑龙江省大兴安岭地区1：5万航空物探测量异常查证”异常的筛选提供依据,也为“小兴安岭地区航磁异常查证”项目异常的筛选提供指导。
Magnetic prospecting including the ground, air, sea and magnetic prospecting of a test track, is the most common method of the geophysical exploration, which is mainly used in the search for iron, copper, lead-zinc metal in the mineral resources, and it is also used in geologic mapping and geological structure investigating. Until now, the iron bed, erzmetall bed and oil-field for our country have been exploring a large number of magnetic prospecting and the study made a great achievement. Magnetic techniques is also a basic geophysical exploration, have been incorporated in the plan of the system of measurement of countries and basicly covers all important areas.
Construction and magmatic activities of the area are very active, gold and polymetal ore-forming effects are on productivity, we study on a magnetic anomaly features, gold and polymetal mineral exploration cruise a magnetic anomaly in the filter and a warrant, which is a breakthrough significance for searching for the gold and polymetal in Daxing'anling oreforming belt.
The area is located in the workplace of Argun-Daxing'anling oreforming belt, including Argun mining areas and Daxinganling mining areas, betwee the two districts is the Huanyu-Xinlin ophiolites belt. Early mesozoic geologic space structure is like the Daxing'anling arc system, and the old bottom of crystallization is an ancient terrains of island arc constitute a basis for the system of rock. Early palaeozoic is mainly bulided by the island arc and the sediment of arc volcano, Late palaeozoic is mainly builted of the broken of sedimentary basins hinder. Since mesozoic,due to the control of the pacific plate, forming the forland basin of Mohe and offshore volcanic arc, had been superimposed on Tianshan-Xingmeng. In the long period of geological structure evolution the shell material energy exchange is active, the earth's crust contractes strongly in the courses of hill-forming, structure combine zone, thrusting nappe zone and strike-slip fracture zone is usually seen in this area.
This article in supported by the programme of geological investigation institute and the resource project in the province, through cruising with a magnetic anomaly filter level 3 and level 2 exception, we discovered the important mineralization clues of gold and bronze polymetal, indicated that the magnetic prospecting is a fast and effective way to look for gold and polymetal mines in Daxing'anling region.
In north of Daxing'anling, to screening of the aeromagnetic anomalies, choose the favorable abnormalities of conditions metallogenic, verification three-tier abnormal; unfolding the secondary abnormal verified for three-tier abnormal. Process secondary abnormal, three-tier abnormal and engineering construction, The 6 exploratory trench slot construction for anomaly of C-2009-10557 at Heilongjiang in 2010. The engineering expose found rock saw a peacock petrochemical, local silliconization and pyrite change also more development. For the number of TC557 anomaly revealed, The stage appear small pyrite granular, erythema shape in granite in north-west locally. According to the basic analysis results, in TC557-04 exploratory trench irisout the 3 low-grade copper ore body,3 copper mineralized zone:The first mineralization 58.40 m, The Average of Cu grade is 0.106% and 2 strip of 2.00 m wide low-grade copper body is circle of. The second mineralization 4.00 m, the Average is 0.116%, the third mineralization 14.00 m, the Average of Cu grade is 0.121% and one strip of 1.00 m wide low-grade copper body is circle of. In TC557-02 exploratory trench irisout the 1 low-grade copper ore body, The first mineralization 15.00 m, The Average of Cu grade is 0.146% and 1 strip of 4.00 m wide low-grade copper body is circle of, average Cu grade 0.232%; The second mineralization 5.00 m, The Average is 0.112%. In TC557-07 exploratory trench irisout of the 5 mineralized zone of molybdenum:the first mineralization 2.00 m, the average of Cu grade is 0.014%, the second mineralization 4.30 m, the average of Cu grade is 0.013%, the third mineralization 3.00 m, the average of Cu grade is 0.012%, the forth mineralization 3.00 m, the average of Cu grade is 0.017%, the fifh mineralization 4.00 m, the average of Cu grade is 0.022%.
Carry out the check and engineering expose of secondary, three-level anomalies for the aeromagnetic anomalies of C14. In the place where the 10Ht-4 anomalies concentration center is identical with the geophysical prospecting and IP concentration center to expose Slot Ethan engineering. Then find a gold mineralization body whose average grade is 0.3×10-6, oblique thick is one meter. Fu ore rock is Fracturing granite which has strong pyrite mineralization. It's pyrite is disseminated and it's crystallinity is high. It's about 0.5mm having silicification and it Show diffuse shape. There are six gold mineralization which is bigger than (0.1～0.3)×10-6.
The results show that through verification screening and aeromagnetic anomalies, it is the benefit of finding the gold and polymetallic mineralized zone and ore body in a shorter time. It is an important way to obtain prospecting breakthrough. On the basis of the data of deposit, mineral occurrence, mineralization point we have already got and 160 aeromagnetic anomalies we verified in 2010, we have summarized the principle, methods and rules of aeromagnetic screening. In order to provide basis for "Heilongjiang and mohe river-tahe area aerogeophysical anomalies verify" and "Heilongjiang daxinganling area 1:50000 aerogeophysical measurement anomaly investigation and verification.As well as providing guidance for" Xiaoxinganling mountain area Aeromagnetic anomalies investigate and verify" item's abnormal screening.
本文依托地调局工作项目和省资源补偿费项目,通过航磁异常筛选与三级、二级异常查证,发现重要的金及铜多金属矿化线索,表明磁法勘查是大兴安岭地区开展金及多金属找矿取得快速突破的有效手段。
工作区地处工作区属额尔古纳—兴安岭成矿带(Ⅱ级成矿区(带),包括额尔古纳成矿区(带)和大兴安岭成矿区(带)两个Ⅲ级成矿区(带),两者之间为寰宇-新林蛇绿混杂岩带。前中生代的地质构造格架为大兴安岭弧盆系(Ⅱ级),其前寒武系构成古老地块的结晶基底或构成多岛弧盆系统的基底杂岩系,早古生界主要由岛弧或弧火山沉积建造组成,晚古生界多为上叠断拗陷盆地沉积建造。中生代以来,受太平洋板块作用的控制,形成漠河前陆盆地和滨太平洋陆缘岩浆弧,叠加于天山—兴蒙造山系之上。在漫长的地质构造演化过程中,壳幔物质能量交换作用活跃,地壳挤压造山收缩作用强烈,构造结合带、推覆构造带(糜棱岩带)、走滑断裂构造发育。
研究区构造—岩浆活动极为发育,金及多金属成矿作用集中产出,系统研究区域航磁异常特征,针对金及多金属矿产勘查开展航磁异常的筛选与查证,对大兴安岭成矿带金及多金属找矿取得突破具有重要意义。
在大兴安岭北部,对圈定的航磁异常进行筛选,选择成矿条件有利的异常,进行三级异常查证；对于三级查证较好的开展二级异常查证。2010年度对黑C-2009-10557号异常进行了三级查证、二级查证和工程揭露,施工了6条探槽。经工程揭露发现岩石中见有孔雀石化,局部硅化、黄铁矿化亦较发育。对TC557-04号异常进行探槽揭露,在其北西端的花岗斑岩局部中见有星点状、团斑状的黄铜矿化矿段。根据基本分析结果,在TC557-04探槽中圈定出3条低品位铜矿体,3条铜矿化带：第一条矿化带宽58.40m,平均Cu品位0.106%,圈出2条宽2.00m的低品位铜矿体；第二条矿化带宽4.00m,平均Cu品位0.116%；第三条矿化带宽14.00m,平均品位0.121%,圈出1条宽1.00m的低品位铜矿体。在TC557-02探槽中圈定出1条低品位铜矿体,2条铜矿化带：第一条矿化带宽15.00m,平均品位0.146%,圈出1条低品位铜矿体,矿体宽4.00m,平均Cu品位0.232%；第二条矿化带宽度为5.00m,平均品位0.112%。在TC557-07号探槽中圈定出5条钼矿化带：第一条矿化带宽2.00m,平均Cu品位0.014%；第二条矿化带宽4.30m,平均Cu品位0.013%；第三条矿化带宽3.00m,平均Cu品位0.012%；第四条矿化带宽3.00m,平均Cu品位0.017%；第五条矿化带宽4.00m,平均品位0.022%。
对C14号航磁异常进行二级、三级异常查证和工程揭露,在10Ht-4异常浓集中心和物探激电浓集中心吻合较好的地段,进行槽探工程揭露,发现金矿化体1条,平均品位0.3．10-6,斜厚lm,赋矿围岩为碎裂花岗岩,具强黄铁矿化、黄铁矿呈浸染状,晶型较完整,大小约0.5mm；具弱硅化、呈弥漫状。(0.1～0.3)×10-6的金矿化6条。上述结果表明,通过航磁异常筛选与查证,有利于快速发现金及多金属矿化带和矿体,是取得找矿突破的重要途径。根据区内已有矿床、矿点、矿化点的资料和2010年查证的160处航磁异常,总结航磁异常筛选的原则、方法和规律,为2011年“黑龙江漠河—塔河地区航空物探异常查证”和“黑龙江省大兴安岭地区1：5万航空物探测量异常查证”异常的筛选提供依据,也为“小兴安岭地区航磁异常查证”项目异常的筛选提供指导。
Magnetic prospecting including the ground, air, sea and magnetic prospecting of a test track, is the most common method of the geophysical exploration, which is mainly used in the search for iron, copper, lead-zinc metal in the mineral resources, and it is also used in geologic mapping and geological structure investigating. Until now, the iron bed, erzmetall bed and oil-field for our country have been exploring a large number of magnetic prospecting and the study made a great achievement. Magnetic techniques is also a basic geophysical exploration, have been incorporated in the plan of the system of measurement of countries and basicly covers all important areas.
Construction and magmatic activities of the area are very active, gold and polymetal ore-forming effects are on productivity, we study on a magnetic anomaly features, gold and polymetal mineral exploration cruise a magnetic anomaly in the filter and a warrant, which is a breakthrough significance for searching for the gold and polymetal in Daxing'anling oreforming belt.
The area is located in the workplace of Argun-Daxing'anling oreforming belt, including Argun mining areas and Daxinganling mining areas, betwee the two districts is the Huanyu-Xinlin ophiolites belt. Early mesozoic geologic space structure is like the Daxing'anling arc system, and the old bottom of crystallization is an ancient terrains of island arc constitute a basis for the system of rock. Early palaeozoic is mainly bulided by the island arc and the sediment of arc volcano, Late palaeozoic is mainly builted of the broken of sedimentary basins hinder. Since mesozoic,due to the control of the pacific plate, forming the forland basin of Mohe and offshore volcanic arc, had been superimposed on Tianshan-Xingmeng. In the long period of geological structure evolution the shell material energy exchange is active, the earth's crust contractes strongly in the courses of hill-forming, structure combine zone, thrusting nappe zone and strike-slip fracture zone is usually seen in this area.
This article in supported by the programme of geological investigation institute and the resource project in the province, through cruising with a magnetic anomaly filter level 3 and level 2 exception, we discovered the important mineralization clues of gold and bronze polymetal, indicated that the magnetic prospecting is a fast and effective way to look for gold and polymetal mines in Daxing'anling region.
In north of Daxing'anling, to screening of the aeromagnetic anomalies, choose the favorable abnormalities of conditions metallogenic, verification three-tier abnormal; unfolding the secondary abnormal verified for three-tier abnormal. Process secondary abnormal, three-tier abnormal and engineering construction, The 6 exploratory trench slot construction for anomaly of C-2009-10557 at Heilongjiang in 2010. The engineering expose found rock saw a peacock petrochemical, local silliconization and pyrite change also more development. For the number of TC557 anomaly revealed, The stage appear small pyrite granular, erythema shape in granite in north-west locally. According to the basic analysis results, in TC557-04 exploratory trench irisout the 3 low-grade copper ore body,3 copper mineralized zone:The first mineralization 58.40 m, The Average of Cu grade is 0.106% and 2 strip of 2.00 m wide low-grade copper body is circle of. The second mineralization 4.00 m, the Average is 0.116%, the third mineralization 14.00 m, the Average of Cu grade is 0.121% and one strip of 1.00 m wide low-grade copper body is circle of. In TC557-02 exploratory trench irisout the 1 low-grade copper ore body, The first mineralization 15.00 m, The Average of Cu grade is 0.146% and 1 strip of 4.00 m wide low-grade copper body is circle of, average Cu grade 0.232%; The second mineralization 5.00 m, The Average is 0.112%. In TC557-07 exploratory trench irisout of the 5 mineralized zone of molybdenum:the first mineralization 2.00 m, the average of Cu grade is 0.014%, the second mineralization 4.30 m, the average of Cu grade is 0.013%, the third mineralization 3.00 m, the average of Cu grade is 0.012%, the forth mineralization 3.00 m, the average of Cu grade is 0.017%, the fifh mineralization 4.00 m, the average of Cu grade is 0.022%.
Carry out the check and engineering expose of secondary, three-level anomalies for the aeromagnetic anomalies of C14. In the place where the 10Ht-4 anomalies concentration center is identical with the geophysical prospecting and IP concentration center to expose Slot Ethan engineering. Then find a gold mineralization body whose average grade is 0.3×10-6, oblique thick is one meter. Fu ore rock is Fracturing granite which has strong pyrite mineralization. It's pyrite is disseminated and it's crystallinity is high. It's about 0.5mm having silicification and it Show diffuse shape. There are six gold mineralization which is bigger than (0.1～0.3)×10-6.
The results show that through verification screening and aeromagnetic anomalies, it is the benefit of finding the gold and polymetallic mineralized zone and ore body in a shorter time. It is an important way to obtain prospecting breakthrough. On the basis of the data of deposit, mineral occurrence, mineralization point we have already got and 160 aeromagnetic anomalies we verified in 2010, we have summarized the principle, methods and rules of aeromagnetic screening. In order to provide basis for "Heilongjiang and mohe river-tahe area aerogeophysical anomalies verify" and "Heilongjiang daxinganling area 1:50000 aerogeophysical measurement anomaly investigation and verification.As well as providing guidance for" Xiaoxinganling mountain area Aeromagnetic anomalies investigate and verify" item's abnormal screening.
引文
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