扎西康多金属矿含碳质岩石中赋矿断裂带的电性变化及找矿意义
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摘要
研究赋存于含碳质岩石中金属矿的电法勘探。使用音频大地电磁测深法和激电中梯剖面法,对赋存于碳质板岩断裂带中的扎西康铅锌锑多金属矿开展电法勘探实验。发现矿区的碳质板岩呈现低阻高极化背景,赋矿断裂呈现明显的高阻低极化异常。通过分析构造热液活动对碳质物性质及其连通性的影响,认为热液蚀变碳质物和碳质物的连通性被热液脉石矿物破坏,可能是高阻低极化条带形成的2种原因。也即矿体的形成与碳质物的蚀变或碳质物的连通性破坏,是成矿流体流经断裂的2种标志物。据此,提出在含碳质岩石中通过寻找碳质物引起的电性异常来识别构造热液活动带,达到间接找矿的目的。
Strong reducing property of carbonaceous rocks contributes to the sedimentation of metal sulfides. Meanwhile, the high conductivity of carbonaceous materials in rocks can seriously affect electrical exploration of the metal deposit containing carbonaceous rocks. The Zhaxikang Pb-Zn-Sb polymetallic deposit is a typical hydrothermal deposit hosted in the carbonaceous slate. During the process of exploration by using AMT and IP intermediate gradient profiling methods, it is showed that the carbonaceous slates in the mining area has low resistivity and high polarization, and the ore-bearing faults presents obvious anomaly with high resistivity and low polarization. The study of the effects of tectonic hydrothermal activities on the properties of carbonaceous substances and their connectivity, indicates that there may be two reasons for the formation of high resistivity and low polarization bands. Hydrothermal fluids alter carbonaceous substances and the hydrothermal gangue minerals destroy the connectivity of carbonaceous substances, that is, the formation of ore body and the alteration of carbonaceous substances or the failure of the connectivity of carbonaceous substances are two aspects of evidence which manifests the flow of ore-forming solution through the faults. Therefore, the electrical anomalies caused by carbonaceous matters in the carbonaceous rocks can be used to identify the tectonic hydrothermal active zone and prospect ore deposit indirectly.
Strong reducing property of carbonaceous rocks contributes to the sedimentation of metal sulfides. Meanwhile, the high conductivity of carbonaceous materials in rocks can seriously affect electrical exploration of the metal deposit containing carbonaceous rocks. The Zhaxikang Pb-Zn-Sb polymetallic deposit is a typical hydrothermal deposit hosted in the carbonaceous slate. During the process of exploration by using AMT and IP intermediate gradient profiling methods, it is showed that the carbonaceous slates in the mining area has low resistivity and high polarization, and the ore-bearing faults presents obvious anomaly with high resistivity and low polarization. The study of the effects of tectonic hydrothermal activities on the properties of carbonaceous substances and their connectivity, indicates that there may be two reasons for the formation of high resistivity and low polarization bands. Hydrothermal fluids alter carbonaceous substances and the hydrothermal gangue minerals destroy the connectivity of carbonaceous substances, that is, the formation of ore body and the alteration of carbonaceous substances or the failure of the connectivity of carbonaceous substances are two aspects of evidence which manifests the flow of ore-forming solution through the faults. Therefore, the electrical anomalies caused by carbonaceous matters in the carbonaceous rocks can be used to identify the tectonic hydrothermal active zone and prospect ore deposit indirectly.
引文
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