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本文提出了一种检测河流沉积物内隐伏磁铁矿矿床的方法。模型研究结果指出,非磁性基质内磁铁矿含量为0.5%的比较小的平板型矿体(厚1m,宽10m)可以使用一台灵敏的(0.1nT)磁力仪进行地面磁测来检测。沿垂直于河流走向而与基岩走向(或航磁异常走向)成某种角度的测线进行测量,结果发现被测剖面上的总场强和垂直梯度异常基本上都在沿河流走向或河谷方向上被拉长了,这说明异常源是隐伏在河流沉积物内磁铁矿含量较高的矿体。对此进一步的证据是(1)在河流和强磁性蛇纹石地域交切处出现较高的总磁场强度和垂直“梯度”异常。(2)原始冰碛物(冰砾泥)上方无高频异常。(3)功率谱上出现某些特性。河流沉积物内比较大的磁铁矿富集体很可能含有最集中的重系列经济矿物,诸如金子。因此最感兴趣的隐伏沙金探测区域可以从地面详细磁测图或直升机低高程磁测图中选取。
This paper presents a method to detect hidden magnetite deposits in river sediments. The results of the model study indicate that relatively small plate-type ores (1 m in thickness and 10 m in width) with a magnetite content of 0.5% in a non-magnetic matrix can be detected using a sensitive (0.1nT) magnetometer for surface magnetometry. The measurements taken at an angle to the strike of the bedrock (or aeromagnetic anomaly) along the direction perpendicular to the river show that the total field strength and vertical gradient anomalies in the measured section are basically either along the river or The direction of the valley was elongated, indicating that the source of anomalies is buried in the river sediments higher magnetite ore body. Further evidence for this is (1) that there is a high total magnetic field strength and vertical “gradient” anomalies at the intersections of rivers and ferromagnetic serpentine areas. (2) There is no high-frequency anomaly above the original moraine (boulder mud). (3) Some features appear on the power spectrum. Larger magnetite enrichments in river sediments are likely to contain the most concentrated heavy-series economic minerals, such as gold. Therefore, the most interested hidden gold detection zone can be selected from the ground detailed magnetic maps or helicopter low elevation magnetic maps.