投稿时间：2024-12-14
修订日期：2025-09-03
网络发布日期：2025-10-31
中文摘要:江南钨矿带黄山岭-桂林郑矿床是一个上部为铅锌(铜)矿体、下部为钨钼矿体的复合矿床，前期研究认为两类矿化均与矿区隐伏花岗斑岩密切有关。然而最近在铅锌(铜)矿体附近识别出石英闪长斑岩，其是否与成矿有关尚不清楚。文章通过详细岩相学观察，对该矿床两类岩体的锆石U-Pb同位素年代学和全岩地球化学分析结果显示，石英闪长斑岩的成岩年龄为(152.0±3.0) Ma (MSWD=0.48，n=14)，具有低硅(w(SiO2)=58.66%~64.71%)、富铝(w(Al2O3)=15.74%~16.11%)及高钾(w(K2O)=3.33%~6.37%)的特征，富集LILE和LREE，亏损HFSE和HREE，为钾玄岩系列、准铝质的I型花岗岩，显示其埃达克质岩的地球化学特征；花岗斑岩的成岩年龄为（129.2±2.6）Ma（MSWD=0.90，n=10），具有高硅（w(SiO2)=76.70%~76.94%）、贫铝（w(Al2O3)=12.18%~12.35%）及高钾（w(K2O)=4.69%~4.79%）的特征，显著亏损Ba、Sr、Eu、P、Ti等元素，为高钾钙碱性系列、准铝质的I型花岗岩。全岩Sr-Nd同位素显示，石英闪长斑岩和花岗斑岩的(87Sr/86Sr)i值分别为0.716 15~0.721 40和0.704 85~0.714 31，ɛNd(t)值分别为-5.38~-4.93和-5.94~-5.75。以上地球化学特征指示该矿床石英闪长斑岩熔体主要源于拆沉下地壳的部分熔融并混合了少量岩石圈地幔组分，岩浆上升侵位过程中受到地壳围岩物质混染；花岗斑岩熔体主要来自上溪群变火成岩的部分熔融。区域对比分析显示，黄山岭-桂林郑矿区中石英闪长斑岩和花岗斑岩分别与江南钨矿带内早期铜(铅锌)矿床和晚期钨矿床成矿岩浆岩的地球化学特征相似，较晚的铜(铅锌)成矿岩体通常具有相对较低的岩浆演化程度和氟含量、相对较高的源区幔源组分占比和氧逸度、富水等专属性特征。
中文关键词:锆石U-Pb同位素定年 地球化学特征 成矿专属性 江南钨矿带（JTB）
Abstract:The Huangshanling-Guilinzheng deposit in the Jiangnan Tungsten Belt (JTB) is a composite deposit consisting of the upper lead-zinc (copper) mineralization and the lower tungsten-molybdenum mineralization. Previous studies have documented that both of them are closely related to the lower granite porphyry in this deposit. In this study, the quartz diorite porphyry occuring near the lead-zinc (copper) mineralized skarn was identified after detailed geological and petrographic observations, and the zircon U-Pb isotopic dating and whole-rock geochemistry of these two types of intrusive rocks in the deposit were carried out. The analytical results indicate that the quartz diorite porphyry intruded at (152.0±3.0) Ma (MSWD=0.48, n=14), with low silica (w(SiO2)=58.66%~64.71%), rich in aluminium (w(Al2O3)=15.74%~16.11%), high potassium (w(K2O)=3.33%~6.37%), enriched in LILE and LREE, and depleted in HFSE and HREE, suggesting it belongs to a shoshonite series, quasi-aluminous I-type granite, and showing characteristics of adakite-like rocks. While the granite porphyry formed at (129.2±2.6) Ma (MSWD=0.90, n=10), with characteristics of high silica (w(SiO2)=76.70%~76.94%), poor in aluminium (w(Al2O3)=12.18%~12.35%), high potassium (w(K2O)=4.69%~4.79%), and depleted in Ba, Sr, Eu, P, and Ti, suggesting it belongs to a high-K calc-alkaline series, quasi-aluminous I-type granite. The (87Sr/86Sr)i and ɛNd(t) values of the quartz diorite porphyry are between 0.71 615 to 0.721 40 and -5.38 to -4.93, respectively, which are distinctly different from granite porphyry ((87Sr/86Sr)i=0.704 85~0.714 31; ɛNd(t)=-5.94~-5.75). These geochemical characteristics indicate that the earlier quartz diorite porphyry magma was partially melted from the lower crust, with a minor lithospheric mantle addition, and experienced visible crustal contamination during its emplacement. While the later granite porphyry magma was partially melted from the Shangxi Group metamorphic rocks (basement strata). After comparing with typical ore-forming granitoid intrusions in JTB, it shows that the quartz diorite porphyry and granite porphyry in the Huangshanling-Guilinzheng deposit have similar geochemical characteristics with the copper (lead-zinc) ore-forming intrusions and tungsten ore-forming intrusions in the Jiangnan tungsten belt respectively. Furthermore, the earlier copper (lead-zinc) ore-forming intrusions generally exhibit lower crystal differentiation degrees and F contents, higher oxygen fugacity, water contents, and mantle components than the later tungsten ore-forming intrusions.
keywords:zircon U-Pb isotopic dating geochemical characteristics metallogenic specialization Jiangnan Tungsten Belt (JTB)
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基金项目:本文得到国家自然科学基金(编号：42472099、42430811)、安徽省自然资源厅科技项目(编号：2023-K-17)和安徽省公益性地质工作项目(编号：2021-g-8)联合资助
引用文本：
雷行行,张达玉,苏海博,刘永飞,丁宁,周涛发.2025.江南钨矿带黄山岭-桂林郑矿床两类成矿岩体成因及其地质意义[J].矿床地质,44(5):942~968LEI HangHang,ZHANG DaYu,SU HaiBo,LIU YongFei,DING Ning,ZHOU TaoFa.2025.Genesis and geological significance of two types ore-forming intrusions in Huangshanling-Guilinzheng deposit, Jiangnan Tungsten Belt[J].Mineral Deposits44(5):942~968
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