首页|3-D spatial distribution of concealed ore-forming granitoid intrusion and structures determined by the CSAMT survey of Wuxu Sb-Zn-polymetallic ore district, South China
3-D spatial distribution of concealed ore-forming granitoid intrusion and structures determined by the CSAMT survey of Wuxu Sb-Zn-polymetallic ore district, South China
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NETL
NSTL
Taylor & Francis
Wuxu ore district is an important lead-zinc-antimony polymetallic ore field within the Danchimetallogenic belt of South China. Although previous geochemical studies have indicated thatthe deposit type is medium to low-temperature magmatic-hydrothermal, the existing metallogenicmodels remain controversial due to the thick covering layer and lack of exposure of graniticbodies. To address this issue, this study utilised four CSAMT parallel profiles across the Wuxuanticline to perform two-dimensional inversion, yielding high-resolution subsurface resistivitymodels. By comparing the resistivity anomalies along the regional strike shown by the profilesand integrating geochemical and ore deposit structural analyses, a detailed geological interpretationwas conducted. A significant high-resistivity body beneath the core region of the Wuxuanticline is interpreted to be the Yanshanian period granitic intrusion. There are westward- andeastward-dipping high-conductivity belts existing within the western and eastern wings andappear to sandwich the inferred high-resistivity code of the Wuxu anticline, respectively. Theymay represent the deep faults extending underground and are the result of decoupling of lithologicalinterface within the anticline and thereby rock fracturing. The high-conductivity featuremay be the result of filling with high-conductivity saline fluids, and possible hydrothermal alteration.The regional compression stress during the Caledonian period and the early Yanshanianperiod promoted the formation of the anticline and rock fracturing of both wings of the anticline.After that, the regional extension background of the late Yanshanian period made the faultzones reactivated, becoming the site and channels for magmatic intrusion, upward transportingof hydrothermal fluid and alteration, causing lead-zinc-antimony polymetallic ore formation.The exposed ore deposits above may also corroborate this view point. In summary, our resistivitymodel visually depicts the spatial distribution of the granitic intrusion controlling ore formationand major structures such as anticlines, fault zones, and hydrothermal alteration zones in the 3-Dspace, providing new geophysical constraints for solving the controversy over the metallogenicmodel for Wuxu ore district.
NETL
NSTL
Taylor & Francis
