华南南岭地区W矿化与花岗岩侵入体的成因关系:来自上坪矿床新钻孔的锆石和锡石u-pb年龄的制约因素

IF 3.2 2区 地球科学 Q1 GEOLOGY
Gen-Wen He , Pei Ni , Wen-Sheng Li , Lin-Lin Peng , Kai-Han Zhang , Jun-Yi Pan , Jian-Ming Cui , Zi-Hao Zhao , Zhao-Hui Li , Hong-Hui Yao
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引用次数: 0

摘要

南岭成矿带以广泛开发典型的石英脉型 W 矿床而闻名。这些含有黑钨矿的石英脉经常紧邻花岗岩侵入体。钨矿化与相关花岗岩之间的遗传关系仍存在争议。上坪矿床是南岭地区具有重要历史意义的石英脉型钨矿床。然而,钨矿化发生的具体时间仍然是个谜。矿区没有花岗岩侵入体,只有花岗岩斑岩堤出露,因此钨矿化与岩浆活动之间的联系仍不明确。幸运的是,近年来在上坪 W 矿床东南部的钻孔中发现了一个隐蔽的花岗岩侵入体。要全面探讨花岗岩岩浆活动与 W 矿化之间的联系,弥补花岗岩和矿石矿物地质年代资料的相对不足至关重要。在这里,为了首次获得关于上坪 W 矿床起源的直接年龄约束,我们使用了不同技术的组合,包括锆的 Hf 同位素地球化学和使用激光烧蚀-电感耦合等离子体质谱(LA-ICP-MS)进行锡石 U-Pb 评估。基于这些可靠的数据,我们初步评估了 W 矿化与花岗岩侵入体之间的联系。对于花岗岩斑岩,大多数具有代表性的 U-Pb 锆石测定结果确定了 206Pb/238U 年龄为 150.2 ± 0.5 Ma。根据锆石的铀-铅等时线年龄,推断坑尾窝隐伏花岗岩的成岩年龄约为 151 Ma。结合 Hf 同位素特征,它揭示了坑尾窝隐伏花岗岩的成矿潜力。热液石英脉中的锡石晶粒为近面体至正面体,截距较低的 206Pb/238U 年龄为 153.9 ± 1.0 Ma。就上坪 W 矿床而言,所有这些新的地质年代都提供了 150-154 Ma 的约束良好的成矿年龄。坑尾窝地区隐伏花岗岩的年代与上坪地区钨矿化的年代极为吻合,表明它们大致同时发生。上坪矿床的脉型钨矿化可能与深部的隐伏花岗岩结晶有遗传联系,这需要进一步研究。这些结果凸显了上坪矿床深部隐伏花岗岩侵入体孕育散布型钨矿化的重要性和潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Genetic relationship between W mineralization and granitic intrusion in Nanling Region, South China: Constraints from zircon and cassiterite u-pb age from new drill holes in Shangping deposit

Genetic relationship between W mineralization and granitic intrusion in Nanling Region, South China: Constraints from zircon and cassiterite u-pb age from new drill holes in Shangping deposit
The Nanling metallogenic belt is known for the widely development of typical quartz vein type W deposit. These quartz veins that contain wolframite are frequently located in close proximity to granitic intrusions. The genetic relationship between tungsten mineralization and the associated granitic rocks is still a subject of controversy. The Shangping deposit stands out as a historically significant W deposit with a quartz vein type in the region of Nanling. However, the specific time that W mineralization occurred remains enigmatic. Granitic intrusions are absent from the mine and only granite porphyry dike is exposed, so the link between tungsten mineralization and magmatic activity remains unclear. Fortunately, in recent years, a concealed granite intrusive has been exposed in drill holes in the southeastern of the Shangping W deposit. To comprehensively address the connection between granitic magma activity and W mineralization, it is vital to make up a relative deficiency of geochronological information on granite and ore mineral. Here, in order to get the first direct age constraints on the origin of the Shangping W deposit, we use a combination of different techniques, incorporating the Hf isotope geochemistry of zirconium and cassiterite U-Pb assessment using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Based on these robust data, we tentatively evaluated the connection between W mineralization and granitic intrusion.For the granite porphyry, the majority of representative U-Pb zircon assays establish a 206Pb/238U age of 150.2 ± 0.5 Ma. An inferred emplacement age of ca. 151 Ma for the concealed granite in Kengweiwo is supported by a U-Pb isochron age from zircon. Combined with Hf isotopic characterization, it illuminates the mineralization potential of the Kengweiwo concealed granite. Cassiterite grains from hydrothermal quartz vein are subhedral to anhedral and have a lower intercept 206Pb/238U age of 153.9 ± 1.0 Ma. For the Shangping W deposit, all of these new geochronological dates provide well-constrained mineralization ages of 150–154 Ma. The dates of the concealed granite in the Kengweiwo area and the tungsten mineralization in the Shangping area are extremely concordant, indicating that they occurred roughly concurrently. The vein type tungsten mineralization in Shangping deposit may has a genetic link with crystallization of uncovered granite present at depth, which requires further investigation. These results emphasize the significance and potential of concealed granitic intrusion to host disseminated W mineralization in the deep part of Shangping deposit.
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来源期刊
Ore Geology Reviews
Ore Geology Reviews 地学-地质学
CiteScore
6.50
自引率
27.30%
发文量
546
审稿时长
22.9 weeks
期刊介绍: Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.
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