Abstract As a world-class W–Cu–Mo polymetallic deposit in South China, there are lots of studies focusing on the geochemical characteristics and metallogeny in this region, however, geophysical observations with special attention on the deep structure of the ore district are quite few. In order to better understand the metallogenic mechanism at Dahutang region, we deployed a dense seismic array and then performed the seismic image to get the deep structure, including the ambient noise tomography, receiver function calculation, H-κ stacking and joint inversion of receiver function and surface wave dispersion. The Moho depth deepens from the south to the north along the array. The seismic image and gravity anomaly show a low velocity in the upper crust, high velocity in the middle-lower crust, relatively high Vp/Vs ratio, and low gravity anomaly beneath the Dahutang deposit. These features may indicate the process of mineralization: under the context of lithospheric extension and thinning in the Late Mesozoic, there are some magma underplating and melting the lower crust. The hot melts migrated upward and differentiated, the dense component cooled in the middle-lower crust to form the high velocity zones. The light component intruded into the Neoproterozoic granite and formed the Mesozoic granite, providing the heat and material source for the further enrichment of tungsten‑copper polymetallic ore.

中文翻译：

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华南大湖塘矿床基于阵列的地震图像：对矿化的洞察

摘要 作为华南地区世界一流的 W-Cu-Mo 多金属矿床，该地区的地球化学特征和成矿学研究较多，但对矿区深部结构特别关注的地球物理观测相当多。很少。为了更好地了解大湖塘地区的成矿机制，我们部署了密集地震台阵，然后进行地震图像获取深部构造，包括环境噪声层析成像、接收函数计算、H-κ叠加和接收函数联合反演和表面波色散。莫霍面深度沿阵列由南向北加深。地震图像和重力异常显示上地壳速度低，中下地壳速度高，Vp/Vs 比值较高，和大湖塘矿床下方的低重力异常。这些特征可能预示着成矿过程：在晚中生代岩石圈拉张减薄的背景下，有一定的岩浆底侵作用和下地壳的熔融作用。热熔体向上迁移分化，致密组分在中下地壳冷却形成高速带。轻组分侵入新元古代花岗岩，形成中生代花岗岩，为钨铜多金属矿的进一步富集提供了热量和物质来源。热熔体向上迁移分化，致密组分在中下地壳冷却形成高速带。轻组分侵入新元古代花岗岩，形成中生代花岗岩，为钨铜多金属矿的进一步富集提供了热量和物质来源。热熔体向上迁移分化，致密组分在中下地壳冷却形成高速带。轻组分侵入新元古代花岗岩，形成中生代花岗岩，为钨铜多金属矿的进一步富集提供了热量和物质来源。