| 马振波.河南栾川矿集区深部资源综合物探找矿勘查[J].地质与勘探,2022,58(4):846-856 |
| 河南栾川矿集区深部资源综合物探找矿勘查 |
| Comprehensive geophysical exploration of deep resources in the Luanchuan ore concentration area of Henan Province |
| 投稿时间：2021-03-23 修订日期：2022-06-21 |
| DOI：10.12134/j.dzykt.2022.04.013 |
| 中文关键词: 钼钨矿 重力磁法 CSAMT 卡尼亚电阻率 栾川矿集区 河南省 |
| 英文关键词: molybdenum-tungsten deposit, gravity and magnetic survey, CSAMT, Cagniard
resistivity, Luanchuan ore concentration area, Henan Province |
| 基金项目:河南省地质勘查基金项目（编号：豫国土资发[2012,80号]、豫国土资发[2014,3号]、
豫国土资发[2015,70号]）联合资助 |
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| 中文摘要: |
| 河南栾川县为全国的钼都，矿产资源丰富，已探明钼钨矿产资源与出露岩体关系密切，矿体多产在岩体或岩体接触带围岩。为进一步加强栾川矿集区的资源勘查，确定隐伏岩体的空间分布和成矿规律，对深部资源进行评价，在栾川矿集区开展了重力、磁法面积测量和CSAMT电磁法剖面测量等综合物探找矿勘查。在矿集区开展1∶2.5万重力和磁法面积测量，通过向上延拓、求导及水平梯度模等方法，提取、识别与地质相关的重磁场信息，判断隐伏岩体的分布范围，依地质模型为约束条件，对资料进行定量-半定量解释，圈出隐伏岩体的空间分布形态，构建三维地质模型，得出栾川矿集区隐伏岩体规模巨大，深部资源量丰富。依据重磁解释成果，优选隐伏岩体顶界面相对较浅的黄背岭矿区，进行CSAMT剖面测量，利用卡尼亚电阻率陡变带，对隐伏岩体的顶界面进行定位。经钻孔验证，在黄背岭矿区新发现三条钼钨矿体，矿体产在岩体顶界面上下一定范围内，在岩体的凹陷部位往往矿层厚度较大，新增钼金属量102.01万吨、WO3资源量21.66万吨。成果表明，利用钼钨矿体多产在岩体界面上下一定范围内的特征，用重力、磁法面积测量确定隐伏岩体空间分布，CSAMT剖面测量确定岩体顶界面，指导钻孔定位的物探组合方法，在栾川矿集区深部资源的勘查中成果显著，该方法组合可为“中国钼都”战略资源深部找矿提供强有力的技术支撑。 |
| 英文摘要: |
| Luanchuan County is the molybdenum capital of China, and contains abundant mineral resources. The proven molybdenum and tungsten mineral resources have been inferred to be closely related to the outcropped rock masses, and ore bodies are mainly hosted in in rock mass or surrounding rock of rock mass contact zone. This work aims to strengthen the resources exploration in the Luanchuan ore concentration area, determine the spatial distribution and metallogenic regularity of concealed rock masses, and further evaluate the deep resources. Comprehensive geophysical exploration such as gravity and magnetic survey and CSAMT electromagnetic profiles were conducted in this ore concentration area. Gravity and magnetic areal measurements at a scale of 1:25, 000 were performed to extract and identify geologically related information through upward continuation, derivation and horizontal gradient modulus methods, and the distribution of concealed rock masses was thus obtained. Constrained by geological model, this work performed quantitative and semi-quantitative interpretation of the data to delineate concealed rock masses, and constructed a 3D geological model. It is inferred that the concealed rock masses in the Luanchuan ore concentration area have a huge scale and abundant deep resources. According to the gravity and magnetic interpretation, the Huangbeiling mining area with shallow top interface of concealed rock masses was selected to conduct CSAMT profile measurements, and the abrupt change zone of Cagniard resistivity was used to locate the top interface of concealed rock masses. Drilling verification shows that three new molybdenum and tungsten ore bodies were discovered in the Huangbeiling mining area. The ore bodies occur in a certain range above and below the top interface of rock masses, and the thickness is usually large in the depression of rock masses. The newly discovered molybdenum metal amount is 1, 020,100 tons and the WO3 amount is 216, 600 tons. As molybdenum and tungsten ore bodies occur in a certain range above and below the rock mass interface, gravity and magnetic methods can be utilized to determine the spatial distribution of concealed rock masses, and CSAMT survey can be used to determine the top interface of rock masses. These comprehensive geophysical methods can be well used to guide the positioning of boreholes, and have achieved remarkable results in the exploration of deep resources in the Luanchuan ore concentration area. This method combination can provide strong technical support for deep prospecting of strategic resources in the Luanchuan "molybdenum capital of China". |
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