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随着磁力仪灵敏度、坚固性和便携性的提高,使得磁力仪有可能在缺少原岩“磁噪声”条件下查明砂矿中某些砾石的类型。磁法勘探找砂金矿的效果取决于以下三个因素:1.与金共生的磁铁矿的数量;2.砾石层的深度;3.基岩的性质。我们都知道,美国内华达州砂矿中的金是与磁性黑砂伴生的。研究者们对黑砂中的磁铁矿进行了就地评价测量。当深部有含金砾石存在时,则很容易用磁测方法发现,因为含金砾石层阻档住了基岩的可能影响,改善了有效信号与噪声的比例关系。基岩类型对磁测效果的作用也是很大的。当基岩是磁化率低的岩石时,则会形成均匀的磁背景,不会妨碍含矿砾石的发现。这一般是由强烈侵入作用
With the increased sensitivity, robustness and portability of magnetometers, it is possible for magnetometers to pinpoint the type of gravel in the placer, in the absence of raw rock “magnetic noise”. The effectiveness of magnetic prospecting for gold recovery depends on three factors: 1. The amount of magnetite that is coexistent with gold; 2. The depth of the gravel layer; 3. The nature of bedrock. We all know that the gold in the plains of Nevada in the United States is associated with magnetic black sand. Researchers conducted in situ evaluation of magnetite in black sand. When deep gold-bearing gravel exists, it is easy to detect magnetically because the gravel layer blocks the possible effects of bedrock and improves the effective signal-to-noise ratio. The role of bedrock type on magnetic measurement effect is also great. When the bedrock is a rock with a low magnetic susceptibility, a uniform magnetic background is formed that does not prevent the discovery of ore-bearing gravels. This is generally caused by a strong intrusion