| 齐勇攀,李水平,荆鹏.时间域激电法在坦桑尼亚尼亚斯罗利金矿勘查中的应用[J].矿产勘查,2020,11(6):1270-1276 |
| 时间域激电法在坦桑尼亚尼亚斯罗利金矿勘查中的应用 |
| Application of time domain induced polarization (IP) method in the Nyasirori gold deposit,Tanzania |
| 投稿时间：2020-02-27 |
| DOI： |
| 中文关键词: 金矿 时间域激发极化法 勘查应用 坦桑尼亚 |
| 英文关键词: gold deposit, time domain induced polarization (IP) method, survey application, Tanzania |
| 基金项目:国外矿产资源风险勘查专项(编号:201210B01600234)资助。 |
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| 中文摘要: |
| 尼亚斯罗利(Nyasirori)金矿位于坦桑尼亚环维多利亚湖东部的穆索马—马拉绿岩带(Musoma-Mara)上,提交(332)+(333)金资源量约11 t,平均品位6.62×10-6。尼亚斯罗利金矿为隐伏构造蚀变岩型金矿,为了指导矿区勘查工作,依据探测目标体(构造蚀变岩)具有“低-中阻、弱极化”、其它岩石表现为“高阻、微极化”或“低阻、高极化”的物理特性,投入了大功率时间域激发极化法(激电中梯、激电测深),获得了由探测目标体和目的物引起的良好激电异常,了解了它们在平面上和地下半空间内的电性分布特征,依据激电中梯显示的“低-中阻、弱极化”异常圈定了矿化富集部位,激电测深显示的“低-中阻、弱极化”断面异常对含矿地层或构造和金矿(化)体进行空间定位,起到了为钻探工程布置提供充分依据的作用。大功率时间域激发极化法指导了矿区勘查工作,提高了钻探见矿率和总体找矿效果。 |
| 英文摘要: |
| The Nyasirori gold deposit is located in the Mara-Musoma greenstone belt in the eastern part of the Lake Victoria of Tanzania. The submitted industrial grade (332) + (333) gold reserve is about 11 t with an average grade of 6.62×10-6. Nyasirori gold deposit is a tectonic altered rock type gold deposit in Tanzania, In order to guide the exploration of mining areas, according to the physical characteristics of the detection target body(tectonic altered rock) with "medium resistance, weak polarization", and other rocks with "high resistance, micropolarization " or "low resistance, high polarization ", A high power time-domain excitation polarization method is performed(Induced polarization measured using central gradient array and Induced polarization sounding), obtained good excitation anomalies caused by detection target bodies and objects, and understood their electrical distribution characteristics in the plane and underground semi-space. According to the anomaly of "medium resistance and weak polarization" displayed by the induced polarization measured using central gradient array, the mineralization and enrichment sites were determined. The anomaly of “low or medium resistivity, weak polarization rate” in the section shown by the induced polarization bathymetry has the function of providing a sufficient basis for the drilling project layout by positioning the ore-bearing strata or tectonic and gold deposits. The high-power time-domain induced polarization method guides the exploration of the mining area, improves the drilling prospecting rate and the overall prospecting effect. |
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