近日，昆明理工大学孔志岗团队研究了原地U-Pb定年和石榴石、钛铁矿的微量元素作为矽卡岩矿床年龄和成矿条件的指标——以云南南部官房东瓜林矿床为例。这一研究成果发表在2025年12月9日出版的《地球化学学报》杂志上。

宝珠山矿集区作为华南西部钨锡多金属成矿带的关键组成部分，在其中心区域发育十余处矿床（或矿点），主要成矿阶段时限约为88 Ma。

研究组聚焦于该矿集区内的官房矿床（南部）和冬瓜林矿床（北部）。对冬瓜林矿床中榍石和石榴石的原位激光剥蚀电感耦合等离子体质谱U-Pb年代学分析，分别获得其Tera-Wasserburg下交点年龄为98.3 ± 5.7 Ma（MSWD = 0.53, n = 24）和100.28 ± 9.97 Ma（MSWD = 0.53, n = 23）。结合前人研究，这些结果表明矿集区内存在两期独立的矽卡岩成矿事件：早期（约98 Ma）和晚期（约88 Ma）。

地球化学分析揭示，主成矿阶段（约88 Ma）的成矿流体相较于早期阶段（约98 Ma）具有更高的氧逸度。石榴石中较高的W、Sn含量指示冬瓜林矿床与官房矿床（分别约98 Ma和约88 Ma）具有显著的钨锡成矿潜力。榍石的Sn元素数据进一步表明，相对于约98 Ma的阶段，约88 Ma的成矿阶段具有更大的Sn富集潜力。这些发现深化了对区域成矿过程的理解，并为今后的找矿勘查工作提供了新的认识。

附：英文原文

Title: In situ U–Pb dating and trace element of garnet and titanite as indicators of the age and ore-forming condition of skarn deposit: A case study of the Guanfang-Donggualin deposits in southern Yunnan, China

Author: Li, Zhipeng, Ren, Yangyang, Liu, Yi, Kong, Zhigang, Dong, Youpu, Liu, Xuelong, Yang, Guangshu

Issue&Volume: 2025-12-09

Abstract: The Bozhushan ore cluster (BOC), a critical component of the W-Sn polymetallic metallogenic belt in western South China, contains over 10 mineral deposits (or ore occurrences) in its central region, with the main mineralization stage dated to approximately 88 Ma. This study focuses on the Guanfang deposit (GFD, southern sector) and the Donggualin deposit (DGLD, northern sector) within the BOC. In situ LA-ICP-MS U–Pb geochronology of titanite and garnet from the DGLD yields Tera-Wasserburg lower intercept ages of 98.3 ± 5.7 Ma (MSWD = 0.53, n = 24) and 100.28 ± 9.97 Ma (MSWD = 0.53, n = 23), respectively. Integrated with previous studies, these results suggest the existence of two independent skarn mineralization events in the ore cluster: an early stage (~ 98 Ma) and a later stage (~ 88 Ma). Geochemical analyses reveal that the ore-forming fluids during the main mineralization stage (~ 88 Ma) exhibited higher O compared to the early stage (~ 98 Ma). The high W and Sn contents in garnet indicate that the DGLD and GFD (~ 98 Ma, ~ 88 Ma) have significant W-Sn mineralization potential. Titanite Sn element data further suggest that the ~ 88 Ma mineralization stage has a greater Sn enrichment potential relative to the ~ 98 Ma stage. These findings enhance the understanding of regional metallogenic processes and provide novel insights for future exploration targeting.

DOI: 10.1007/s11631-025-00836-0

Source: https://link.springer.com/article/10.1007/s11631-025-00836-0