| 浙西南龙泉塘上铅锌矿床成矿流体来源、演化及其地质意义 |
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| 引用本文： | 邓茂春,吴海,俎波,胡辉,章浩,杨文轩,董晨. 浙西南龙泉塘上铅锌矿床成矿流体来源、演化及其地质意义[J]. 矿产勘查, 2024, 15(7): 1153-1166 |
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| 作者姓名： | 邓茂春 吴海 俎波 胡辉 章浩 杨文轩 董晨 |
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| 作者单位： | 1.江西省地质局第五地质大队,江西 新余 338000;2.中国地质大学(武汉)资源学院,湖北 武汉 430074;3.江西省地质局,江西 南昌 330046 |
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| 基金项目： | 本文受国家重点研发计划项目（2022YFC2903301）、国家自然科学基金项目（42372101）和江西省地质局项目“北武夷成矿带（东段）铜多金属矿成矿规律及找矿方向研究”（2024JXDZKJRC06）联合资助。 |
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| 摘 要： | 塘上铅锌矿床是浙西南地区武夷山Cu-Pb-Zn多金属成矿带新近发现的中型铅锌多金属矿床，其空间产出受断裂构造控制，其成因类型尚不明确。本文在详细划分成矿阶段的基础上，对不同成矿阶段的流体包裹体开展显微测温、激光拉曼和H-O同位素分析。研究表明，成矿早阶段磁铁矿-石英阶段（I）形成温度为273~348 ℃，主成矿阶段脉状方铅矿闪锌矿阶段（II）均一温度为225~304 ℃，成矿晚阶段石英-石英脉阶段（III）均一温度为139~163℃。激光拉曼分析结果显示主成矿阶段成矿流体液相成分以H2O为主，气相成分除H2O外，还有一定量的CO2。石英脉中石英包裹体δDSMOW 主要集中在-72.5‰~-78.9‰，石英δ18O V-PDB数值为-27.6‰-~30.8‰，δ18OV-SMOW集中在-0.6‰~2.5‰，表明塘上铅锌矿床成矿流体来源于岩浆流体，并在成矿过程中有大气降水的逐渐加入。因此，塘上铅锌矿床深部可能具有进一步寻找斑岩型矿化的潜力。
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| 关 键 词： | 成矿流体 H-O同位素 塘上铅锌矿床 斑岩型矿化 武夷山成矿带 |
| 收稿时间： | 2024-02-02 |
| 修稿时间： | 2024-05-09 |
Fluids source， evolution and geological implications of the Tangshang Pb-Zn polymetallic deposit， Longquan， SW Zhejiang |
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| DENG Maochun,WU Hai,ZU Bo,HU Hui,ZHANG Hao,YANG Wenxuan,DONG Chen. Fluids source， evolution and geological implications of the Tangshang Pb-Zn polymetallic deposit， Longquan， SW Zhejiang[J]. Mineral Exploration, 2024, 15(7): 1153-1166 |
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| Authors: | DENG Maochun WU Hai ZU Bo HU Hui ZHANG Hao YANG Wenxuan DONG Chen |
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| Affiliation: | 1.The Fifth Geological Brigade of Jiangxi Provincial Bureau of Geology， Xinyu 338000， Jiangxi China;2.College of Natural Resources， China University of Geosciences （Wuhan）， Wuhan 430074， Hubei， China;3.Jiangxi Provincial Bureau of Geology Nanchang， 330046， Jiangxi， China |
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| Abstract: | The Tangshang Pb-Zn deposit is a medium-sized Pb-Zn polymetallic deposit recently discovered in the Wuyishan Cu-Pb-Zn polymetallic metallogenic belt in southwest Zhejiang. Its spatial output is controlled by fault structures， and its genetic type is not yet clear. In this paper， based on the detailed division of the mineralization stages， microthermometry， laser Raman and H-O isotope analysis were carried out on the fluid inclusions of different mineralization stages. Studies have shown that the formation temperature of the magnetite-quartz stage （Ⅰ） pre-ore period was 273-348℃， and the uniform temperature of the vein-like galena sphalerite stage （Ⅱ） during the main ore-forming period was 225-304°C， and the post-ore period was late. Stage Quartz-quartz vein stage （Ⅲ） homogeneous temperature is 139-163 ℃. Laser Raman analysis results show that the liquid phase composition of the ore-forming fluid in the main ore-forming stage is mainly H2O， and the gas phase composition contains a certain amount of CO2 in addition to H2O. The δDSMOW of quartz inclusions in the quartz veins is mainly concentrated at -72.5‰- -78.9‰， the value of quartz δ18O V-PDB is -27.6‰- -30.8‰， and the δ18OV-SMOW is concentrated at -0.6‰-2.5‰， indicating that the ore-forming fluid comes from magmatic fluid， and there is gradual addition of atmospheric precipitation during the mineralization process. Therefore， the deep part of the Tangshang Pb-Zn deposit may have the potential to further exploration for porphyry-type mineralization. |
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| Keywords: | ore-forming fluids H-O isotopes Tangshang Pb-Zn deposit porphyry mineralization Wuyishan metallogenic belt |
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