铜陵矿集区上地壳三维横波速度结构特征
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1.中国地质科学院;2.安徽省地质矿产勘查局地质队

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Three-dimensional shear wave velocity tomography of the upper crust in the Tongling ore concentration area
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1.Chinese Academy of Geological Sciences;2.Anhui Geological and Mineral Exploration Bureau 321 Geological Team

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    摘要:

    铜陵是长江中下游成矿带内极具特色的矿集区,其浅部地壳波速结构对于揭示整个矿集区中生代的成矿过程具有重要意义,对于开展深部找矿也大有益处。利用在铜陵东部2022-2023年间部署的最小台间距为2-5 km的57个宽频地震台站记录的连续地震数据,通过背景噪声面波层析成像方法获得了铜陵矿集区高精度上地壳三维横波速度结构。结果显示,宣南凹陷浅部横波速度显著低于铜陵隆起,二者之间的横波速度异常分界线勾勒出丁桥-戴汇断裂产状:倾向南东,延伸深度达3 km。铜陵隆起1 km深度之下存在比宣南凹陷更高的横波速度(~3 km/s),可能与铜陵隆起深部存在大规模花岗岩侵入体有关。且侵入体在新桥和狮子山深部呈上隆的岩盖形态,在南部的凤凰山地区则表现为岩床形态。研究结果对认识铜陵矿集区成矿动力学过程有重要意义,也为长江中下游成矿带的岩浆底侵成矿模式提供了新的地震学证据。

    Abstract:

    Located in the Middle-Lower Yangtze River Metallogenic Belt, Tongling represents a unique ore concentration area. The velocity structure of its shallow crust plays a crucial role in deciphering the Mesozoic metallogenic processes of the entire ore district and holds considerable value for deep mineral exploration. During 2022–2023, we deployed 57 temporary broadband stations with a minimum inter-station distance of 2-5 km in eastern Tongling. We apply the continuous records to derive a high-resolution three-dimensional shear-wave velocity structure of the upper-crust in the study region by ambient noise surface tomography. The results show that the S-wave velocity in the shallow part of Xuannan Sag is significantly lower than that of Tongling Uplift, and the boundary of S-wave velocity anomalies delineates well the occurrence of the Dingqiao–Daihui Fault, which dips southeastward and extends to a depth of ~3 km. The S-wave velocity below 1 km depth of the Tongling Uplift is higher (~3 km/s) than that of the Xuannan Sag, implying possible intrusions of large-scale granities in the Tongling uplift. These intrusions display a dome-like laccolith beneath the Xinqiao and Shizishan, and a sill-like bedrock in the southern Fenghuangshan region. The results are of great significance for understanding the metallogenic dynamic process of the Tongling ore concentration area, and also provide new evidence for the magmatic underplating model of the Middle-Lower Yangtze River Metallogenic Belt.

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  • 收稿日期:2025-10-26
  • 最后修改日期:2025-11-10
  • 录用日期:2025-11-14
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