投稿时间：2024-07-20
修订日期：2025-05-03
网络发布日期：2025-07-01
中文摘要:闽西北解放桥钨矿床是近年新发现的与晚侏罗世花岗岩有关的矽卡岩型-石英脉型白钨矿床。矽卡岩钨矿床产于寒武系林田组大理岩透镜体中；石英脉型钨矿产于新元古界下峰岩组中，包含石英大脉和石英细脉型2种矿体；钨矿体空间分布具有上部为似层状矽卡岩型矿体、下部为石英脉型矿体的“上层下脉”的特征。为了研究成矿物质来源和成矿时代，对石英-硫化物成矿期的石英和黄铁矿、闪锌矿、磁黄铁矿分别进行了H、O同位素和S同位素分析，对与成矿相关的花岗岩与花岗斑岩的锆石、矽卡岩中的石榴子石进行了U-Pb测年，结果显示：① δD值介于-72.9‰~-56.4‰，δ18O H2O值介于-3.2‰~2.5‰，在岩浆水与雨水线之间，表明成矿流体起源于岩浆流体，在成矿过程中有大气降水的加入；② δ34S值2.1‰~2.9‰，平均值为2.65‰，属幔源硫，表明硫来源于岩浆；③ 矿区广泛分布的九仙山正长花岗岩获得锆石U-Pb加权平均年龄为（153.6±1.3）Ma，与成矿相关的花岗斑岩获得锆石U-Pb加权平均年龄为（149.8±2.2）Ma，并获得矽卡石中石榴子石的T-W下交点年龄为（150.4±5.3）Ma，说明解放桥钨矿床形成于晚侏罗世，与华南地区的燕山期钨成矿作用具有同步性。
Abstract:The Jiefangqiao tungsten deposit in northwestern Fujian is a newly discovered deposit in recent years, and it is a skarn-quartz vein type scheelite deposit related to the Late Jurassic granite. The skarn tungsten orebodies occur in marble lens of the Cambrian Lintian Formation; while the quartz vein type tungsten orebodies are hosted within the Neoproterozoic Xiafengyan Formation, including two types of orebodies: Large quartz veins and quartz veinlets. The spatial distribution of tungsten orebodies have the characteristics that the upper part is stratoid skarn type orebodies and the lower part is quartz vein type orebodies, in a “upper layered and lower vein” mode. In order to study the source of ore-forming materials and metallogenic age, H, O and S isotope analyses were carried out on quartz, pyrite, sphalerite and pyrrhotite formed in quartz-sulfide metallogenic period, and U-Pb dating was carried out on garnet in skarn and zircon in granite and granite porphyry which are related to mineralization. The results show that : ① The δD value is between -72.9‰ and -56.4‰, and the δ18OH2O value is between -3.2‰ and 2.5‰, which is between the magmatic water and the rainwater line, indicating that the ore-forming fluid is mainly derived from the magmatic fluid, in the process of mineralization atmospheric precipitation is added; ② The δ34S values range from 2.1‰ to 2.9‰, with an average value of 2.65‰, it belongs to mantle-derived sulfur, indicating that the ore-forming materials come from magma; ③ The zircon U-Pb weighted average age of the Jiuxianshan syenogranite widely distributed in the mining area is (153.6±1.3)Ma, and the zircon U-Pb weighted average age of the granite porphyry related to mineralization is (149.8±2.2)Ma, and the T-W lower intersection age of garnet in skarn is (150.4±5.3)Ma, indicating that the Jiefangqiao tungsten deposit was formed in the Late Jurassic and is synchronized with the Yanshanian tungsten mineralization in South China.
keywords:skarn type-quartz vein type tungsten deposit H,O isotope S isotope U-Pb dating Late Jurassic
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基金项目:本文得到福建省自然资源科技创新项目“闽西北地区钨矿成矿规律研究”（编号：KY-060000-04-2023-003）资助
引用文本：
黎敦朋,刘复焜,杨树亮,谢忠龙,黄伟,付一航,陈楠.2025.闽西北解放桥钨矿床成矿物质来源与成矿时代：来自H、O、S同位素分析和锆石、石榴子石U-Pb测年的约束[J].矿床地质,44(3):658~676LI DunPeng,LIU FuKun,YANG ShuLiang,XIE ZhongLong,HUANG Wei,FU YiHang,CHEN Nan.2025.Ore-forming material source and metallogenic epoch of Jiefangqiao tungsten deposit, northwestern Fujian in China:Constraints from H, O, S isotope analysis and zircon, garnet U-Pb dating[J].Mineral Deposits44(3):658~676
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