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有色金属(矿山部分):2019,71(2):33-38
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青海立新地区高精度磁测异常特征及地质意义
((贵州省有色金属和核工业地质勘查局地质矿产勘查院,贵阳 550005))
Features of high accuracy magnetic survey anomaly and their geological significance in Lixin area, Qinghai
((Geological and Mineral Resource Exploration Institute of Guizhou Non-ferrous Metal and Nucleus Industry Geological Bureau, Guiyang 550005, China))
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中文摘要: 通过开展1︰5万地面高精度磁测工作的实地调查,目的是寻找研究区内有利的找矿靶区。通过对区内进行的物探磁法测量,获取了详细的原始磁异常数据,为了准确地分析解释磁异常与地质特征之间的关系,通过化极处理和不同高度的延拓以及异常特征分析,圈定出了磁异常范围,确定了侵入岩体的分布范围和空间特征,筛选出找矿潜力较大的异常区并做出合理推断:C1异常由埋藏深度较大、磁性较强且规模在垂向上由大变小再增大的隐伏岩体引起;C2异常由浅部铜多金属矿化引起;C3-1异常由构造带中埋藏较深、范围不大的中酸性岩体引起;C3-2异常由断裂构造引起。磁异常的整体走向与西金乌兰—金沙江缝合带内构造带走向基本一致,推断由西金乌兰—金沙江缝合带内的含矿构造带引起,同时对磁异常的特征分析对多金属的深部找矿预测可以提供有利证据。
Abstract:Through the field investigation of 1︰50000 ground high-precision magnetic survey, the aim was to find a favorable prospecting target area in this area. Through geophysical magnetic survey, original magnetic anomaly data was obtained. In order to accurately analyze and explain the relationship between magnetic anomaly and geological features, based on the analysis of reduction to the pole、upward continuation and anomaly feature analysis, the scope of the magnetic anomaly was outlined, spatial characteristics of intrusive rock mass was determined, ore-forming target areas was screened and reasonable inferences was made: the anomaly C1 was caused by concealed rock masses with large burial depth, strong magnetic properties, and large scales from large to small scale in the vertical direction. The anomaly C2 was caused by shallow copper polymetallic mineralization. The anomaly C3-1 was caused by medium-acid rock mass with burial depth and small range in the structural belt. The anomaly C3-2was caused by fracture structure. The whole trend of the magnetic anomaly was basically consistent with that of the structural belt within the Xijinwulan-Jinshajiang suture zone, which was caused by the ore-bearing tectonic belt within the Xijinwulan-Jinshajiang suture zone. The characteristic analysis of magnetic anomalies can provide favorable evidence for deep prospecting of polymetallic deposits.
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基金项目:青海省地质勘查基金项目(KD2012-06)
引用文本:
张庆华,罗洪远,卢 卯.青海立新地区高精度磁测异常特征及地质意义[J].有色金属(矿山部分),2019,71(2):33-38.
ZHANG Qinghua,LUO Hongyuan,LU Mao.Features of high accuracy magnetic survey anomaly and their geological significance in Lixin area, Qinghai[J].NONFERROUS METALS(Mining Section),2019,71(2):33-38.

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