| 桂西百色平那钨锡矿床的发现及意义 |
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| 关键词:Pingna W-Sn deposit in Baise ore-field structure Late Cretaceous Dachang district Nanpanjiang– Youjiang metallogenic belt South China |
| 基金项目:中国地质调查局地质调查项目(编号: DD20240127; DD20230344; DD20190161)；深地国家科技重大专项(编号: 2024ZD1001701);中国地质科学院地质力学研究所所长基金项目(编号: DZLXJK202521);广西壮族自治区地质矿产勘查开发局部门预算前期地质勘查项目(编号: 桂地矿地[2023]21号) |
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| The Discovery and Significance of the Pingna Tungsten-tin Deposit in Baise, Western Guangxi, South China |
| The coupling mechanism of structural deformation and mineralization remains a central challenge in metallogenic dynamics and mineral exploration. Research shows that structural superimposition and compounding often result in complex material compositions and structures, which are critical factors in the formation of large and high-grade ore deposits. The Nanpanjiang–Youjiang metallogenic belt in South China is a major tin belt, with proven Sn resources exceeding 3 million tonnes. Characterized by complex deformation and diverse structural styles, this belt provides an ideal setting for innovating structural ore-controlling theories and achieving breakthroughs in W-Sn exploration. Guided by geomechanical theory, this study employed a seven-year integrated industry-academia-research collaborative approach. Through multi-scale ore-field structural mapping, large-scale geophysical and geochemical surveys, as well as trenching and mechanized core drilling verification, we first discovered the Pingna W-Sn deposit within thick clastic rocks of western Guangxi. Detailed structural analysis, deposit dissection, geochronology, and ore-forming fluid studies reveal that the Pingna deposit is a Late Cretaceous magmatic-hydrothermal W-Sn deposit genetically related to a deep-seated concealed felsic intrusion. This discovery confirms the validity of the W-Sn heavy mineral anomalies delineated in the Lucheng–Longchuan metallogenic district on the 1:200 000 Tianlin Sheet ge-ological map. We first recognized an early-stage muscovite-assiterite-quartz mineralization event within the Longlin–Xilin Sb-Au ore cluster, suggesting significant potential for further W-Sn exploration along the Xil-in–Longlin–Tianlin–Baise fault zone. Comparative analysis with the metallogenic model of the Dachang Sn ore district demonstrates that Pingna shares consistent host structural evolution, host rock assemblages, and ore-forming age, indicating its potential to become the second “Dachang-type” Sn ore district. The discovery of Pingna reveals that the formation of the Nanpangjiang–Youjiang Sn belt occurred in a basin- or regional-scale transtensional en-vironment, rather than local extensional settings, significantly advancing our understanding of Sn metallogenic tectonic settings. This exploration breakthrough demonstrates that thick sedimentary clastic rocks can serve as im-portant hosts for W-Sn deposits and further corroborates that Devonian strata are not the primary controlling factor for Sn polymetallic mineralization in the Danchi metallogenic belt. Based on these results, the Youjiang–Tianlin W-Sn key investigation area in western Guangxi is now qualified for upgrading to a key exploration zone, with the potential to become a major W-Sn resource base. Furthermore, this discovery inspires a new exploration direction for medium- to high-temperature magmatic-hydrothermal deposits in western Guangxi, providing a crucial scientific foundation for implementing Guangxi’s new round of Strategic Action for Mineral Exploration Breakthrough. |
| XIAO Changhao,WEI Changshan,CHEN Zhengle,MAO Cheng’an,YU Pingping,LIU Xiangchong,LI Xingpeng,LE Xingwen,YANG Fuqiang,HU Jiaxiu,ZHANG Wen’gao,ZHANG Yu,LU Shenghui,SHENG Yuke.2025.The Discovery and Significance of the Pingna Tungsten-tin Deposit in Baise, Western Guangxi, South China[J].Acta Geoscientica Sinica,46(6):1051-1066. |
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