贵州工程应用技术学院吴涛等人，报道了世界级川滇黔三角碳酸盐岩型铅锌矿床的年代学和地球动力学背景。2024年8月28日，国际知名学术期刊《地球化学学报》发表了这一成果。

准确的成矿年龄对于认识沉积型铅锌矿床的地球动力学背景和成矿机制具有重要意义，这一直是一个挑战。扬子地块西南缘的川滇黔(SYG)三角是全球公认的碳酸盐岩型铅锌成矿区，也是华南低温成矿域的重要组成部分。该地区的铅和锌资源超过3000万吨(Mt) ，并显示出Ga、Ge、Cd、Se、Tl等分散金属的富集。近20年来，基于各种放射性同位素测年方法，研究人员对SYG三角地区铅锌矿床的成矿年龄进行了大量研究。

本文综合总结了SYG三角铅锌矿床的年代学结果和Pb-Sr同位素资料，确定了影响扬子地块西缘古特提斯洋扩张和闭合动力学过程的，两个不同的铅锌矿化期。SYG三角铅锌成矿优势期为中三叠世至早侏罗世(226-191 Ma)，这与古特提斯洋闭合和印支造山运动引发的大规模盆地流体运移密切相关。次生铅锌成矿期发生在晚泥盆世至晚石炭世，受古特提斯洋扩张相关的伸展构造控制。研究结果强调，有必要对晚泥盆世-晚石炭世的铅锌成矿事件的赋存状态，和可能的影响因素进行进一步研究。

附：英文原文

Title: Geochronology and geodynamic setting of the carbonate-hosted Pb-Zn deposits in world-class Sichuan-Yunnan-Guizhou triangle, South China

Author: Xue, Zhongxi, Shi, Wenxin, Wei, Chen, Wu, Tao, Huang, Zhilong

Issue&Volume: 2024-08-28

Abstract: Unraveling the precise mineralization age is vital to understand the geodynamic setting and ore-forming mechanism of the sediment-hosted Pb-Zn deposit; this has long been a challenge. The Sichuan-Yunnan-Guizhou (SYG) triangle in the southwestern margin of the Yangtze Block is a globally recognized carbonate-hosted Pb-Zn metallogenic province and also an essential part of the South China low-temperature metallogenic domain. This region has > 30 million tons (Mt) Zn and Pb resources and shows the enrichment of dispersed metals, such as Ga, Ge, Cd, Se, and Tl. During the past 2 decades, abundant data on mineralization ages of Pb-Zn deposits within the SYG triangle have been documented based on various radioisotopic dating methods, resulting in significant progress in understanding the geodynamic background and ore formation of Pb-Zn deposits hosted in sedimentary rocks at SYG triangle. This paper provides a comprehensive summary of the geochronological results and Pb-Sr isotopic data regarding Pb-Zn deposits in the SYG triangle, which identified two distinct Pb-Zn mineralization periods influencing the dynamic processes associated with the expansion and closure of the Paleo-Tethys Ocean in the western margin of the Yangtze Block. The predominant phase of Pb-Zn mineralization at SYG triangle spanned from the Middle Triassic to Early Jurassic (226–191 Ma), which was intensely correlated with the large-scale basin fluid transport triggered by the closure of the Paleo-Tethys Ocean and Indosinian orogeny. The secondary Pb-Zn mineralization phase occurred during the Late Devonian to Late Carboniferous and was controlled by extensional structures associated with the expansion of the Paleo-Tethys Ocean. Further investigation is necessary to clarify the occurrence and potential factors involved in the Pb-Zn mineralization events during the Late Devonian to Late Carboniferous.

DOI: 10.1007/s11631-024-00724-z

Source: https://link.springer.com/article/10.1007/s11631-024-00724-z