摘要:
南陵—宣城矿集区近年来逐步发展为长江中下游成矿带内的第八个重要矿集区。由于地表覆盖层较厚,深部地质结构的研究相对薄弱,复杂的断裂系统和隐伏岩体尚未得到系统的三维建模与分析,严重制约了成矿规律的认识和深部找矿工作的推进。为揭示该区深部地质结构,综合利用重力、磁法、电磁法及地震等多源地球物理数据,结合钻孔和岩矿石物性等先验信息,优化隐式三维地质-地球物理建模方法,通过多源数据的联合反演和综合建模,建立了南陵—宣城矿集区的三维地质结构模型,详细刻画了区域内断裂网络、隐伏岩体及控矿地层的空间分布特征。多重先验信息约束和钻孔信息进一步提高了模型的精度和可靠性,显著提升了对深部地质结构及成矿系统的解析能力。研究结果揭示了该区控矿要素的空间分布规律,并识别出潜在有利的成矿区段,分析显示,南陵—宣城矿集区内深部岩浆活动与主要构造系统之间具有密切的成矿耦合关系,模型中识别的多个隐伏岩体和控矿地层的接触部位具有良好的找矿潜力,研究成果可为深部找矿工作提供有效的技术支撑。
Abstract:
Nanling-Xuancheng ore district has recently emerged as the eighth significant metallogenic district within the Middle-Lower Yangtze River metallogenic belt. Due to the thick surface cover and relatively insufficient research on the deep geological structure, the complex fault systems and concealed intrusions have not yet been systematically modeled and analyzed in 3D model, which significantly restricts the understanding of metallogenic regularities and the progress of deep mineral exploration. To address this issue, the authors in this paper integrated multi-source geophysical data, including gravity, magnetism, electricity, and seismicity, along with the apriori information of borehole data and rock physical properties. And the implicit 3D geological-geophysical modeling approach was optimized to reveal the deep geological structure and provide effective technical support for deep prospecting. Through joint inversion and comprehensive modeling of multi-source data, this study established a 3D geological model of Nanling-Xuancheng ore district, which delineated the spatial distribution characteristics of fault networks, concealed intrusions, and ore-controlling strata in detail. The incorporation of multiple apriori information constraints and borehole information further improved the model's precision and reliability, significantly enhancing the interpretation ability of deep geological structures and metallogenic systems. The results revealed the spatial distribution regularities of ore-controlling factors and identified potential favorable mineralization zones. The findings suggest that there is a close metallogenic coupling relationship between deep magmatic activity and the primary fault systems in Nanling-Xuancheng ore district, and that several contact zones between the identified concealed intrusions and ore-controlling strata have promising mineralization potential.
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