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首页> 外文期刊>Geophysical Prospecting >Integrated geological and geophysical exploration for concealed ores beneath cover in the Chaihulanzi goldfield, northern China
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Integrated geological and geophysical exploration for concealed ores beneath cover in the Chaihulanzi goldfield, northern China

机译：中国北方柴胡兰子金矿藏隐蔽矿藏地质与地球物理综合勘探

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An integrated geological and geophysical investigation was carried out in the near-mine areas of the Chaihulanzi gold-field, Inner Mongolia, northern China, to determine the south-eastern strike extension of the principal mineralized shear system, in the search for new resources. In this case study, surface geophysical surveys played an important role in defining the mineralized structures beneath cover. A re-investigation of the mine geology by observing the underground exposures of mineralization and its hosting structures, coupled with re-evaluation and re-examination of previous exploration data, revealed that the mineralization style at the Chaihulanzi gold-field is not the skarn-type as previously assumed, but is structurally controlled by an oblique-sinistral shear structure. Moreover, a southeastward shallow-plunging mineralized corridor within the principal mineralized shear system was also identified, implying that the ore-forming fluid-flow might move through the mineralizing system, from the south-east at depth to the north-west. These new geological findings imply that the mineralized shear system should extend much farther south-eastwards along strike beneath cover, and thus a conceptual target area was proposed. A detailed geophysical survey program, involving the application of VLF-EM, Stratagem EH4, CSAMT and gradient IP measurements, was carried out to test the validity of the conceptual target. Orientation surveys on the geologically known Line-18 traverse revealed that VLF-EM and Stratagem EH4 were the most effective methods of detecting the unseen mineralized system, whereas CSAMT could only provide low-resolution data, and IP proved to be unsuitable in this environment due to the ubiquitous presence of graphite-bearing schists in and around the mineralized system. A follow-up systematic VLF-EM survey highlighted the principal mineralized shear system as a linear conductive belt, tracing the principal mineralized system for a further 750 m of strike length beneath cover from the previous exploration limit (Line 18). Stratagem EH4 soundings over six parallel traverses perpendicular to the mineralized trend revealed that the principal mineralized shear structure extends for more than 500 m in the dip direction, a strong indication of the presence of potential deep mineralization under the surveyed area. Detailed modelling of the Stratagem EH4 sounding images provided well-defined targets for test drilling. Subsequent test drilling on some of these targets returned encouraging results as several core-intercepts of economic gold mineralization were encountered. This led to a more extensive drilling and underground prospecting program, focusing on deep mineralization south-eastwards along the mineralized trend.
机译：在中国北部内蒙古柴胡兰子金矿区的近矿区进行了综合的地质和地球物理调查，以确定主要矿化剪切系统的东南走向扩展，以寻找新资源。在此案例研究中，地表地球物理调查在定义覆盖层下的矿化结构方面发挥了重要作用。通过观察矿藏的地下暴露及其宿主结构对矿山地质情况进行的重新调查，再加上对先前勘探数据的重新评估和重新审查，结果表明，柴胡兰兹金矿的矿化方式不是矽卡岩岩，如前所述，但在结构上受倾斜正弦剪切结构控制。此外，还确定了主要矿化剪切系统内向东南浅陷的矿化走廊，这意味着成矿流体流可能会从东南深度向西北移动穿过矿化系统。这些新的地质发现表明，矿化剪切系统应沿覆盖层下方的走向向东南延伸得多，因此提出了一个概念上的目标区域。进行了详细的地球物理勘测程序，包括VLF-EM，Stratagem EH4，CSAMT和梯度IP测量的应用，以测试概念目标的有效性。对地质已知的18号导线的定向调查显示，VLF-EM和Stratagem EH4是检测看不见的矿化系统的最有效方法，而CSAMT仅能提供低分辨率数据，并且IP被证明不适用于这种环境在矿化系统中及其周围普遍存在着含石墨片岩。后续的系统性VLF-EM调查强调了主要的矿化剪切系统是一条线性导电带，从先前的勘探极限（第18行）开始，追踪了主要的矿化系统，其覆盖层下方还有750 m的走向长度。垂直于矿化趋势的六个平行横断面的Stratagem EH4测深表明，主要的矿化剪切结构在倾角方向延伸了500 m以上，有力地表明了被调查区域内潜在的深部矿化作用。 Stratagem EH4探测图像的详细建模为测试钻探提供了明确的目标。随后对其中一些目标进行的试验钻探返回了令人鼓舞的结果，因为遇到了几个经济金矿化的岩心拦截。这导致了更广泛的钻探和地下勘探计划，重点是沿着矿化趋势向东南方向深部矿化。

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