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地磁场(AR)中剪切断层型断裂(破裂)的表达:以 Lisagor 矿田为例

Gagik Markosyan, Lyuba Mirzoyan
埃里温国立大学地理和地质系

摘要


本文讨论了磁力测量(磁力勘探)绘制剪切断层断裂图的可能性及其在磁场中分离的规律。断裂发生的地质构造先决
条件及其意义被表示为矿山控制结构。特别是剪切断层断裂,除了环境磁畴结构的机械变化外,还会导致磁畴磁矩的定向和
磁矩的减小。因此,断裂带的地磁异常场强度在一定程度上降低,这在磁力测量过程中有时无法记录,特别是当扰动发生在
磁性较弱的复杂沉积岩区域时。该问题的解决方案,尤其是在褶皱区域,可以通过存在具有陡坡的磁性活动层(基性岩脉、
磁铁矿砂岩等),该层经历了剪切断层破裂。本文介绍了在 AR 的 Lisagore 矿区通过地磁研究发现的剪切断层型断裂。这些断
裂表现在带有砂岩夹层的泥质岩磁活动层的几个滑动幕中,地质图中也对此进行了描述。泥板岩本身不具有磁性财产,因此
其磁性活动可以用磁铁矿-砂岩薄夹层的存在来解释,这些夹层由一系列 T 场的高强度线性异常所描述,这些异常被断裂位置
处滑动幅度的大小所中断并相互偏离。

关键词


构造断裂;剪切断层;磁强计;磁异常

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参考


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DOI: http://dx.doi.org/10.12361/2661-3646-05-03-128817

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