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
Fluids source,evolution and geological implications of the Tangshang Pb-Zn polymetallic deposit,Longquan,SW Zhejiang
邓茂春 1吴海 1俎波 2胡辉 1章浩 2杨文轩 2董晨3
作者信息
- 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
- 折叠
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.
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 mineraliza-tion 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℃,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.
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Key words
ore-forming fluids/H-O isotopes/Tangshang Pb-Zn deposit/porphyry mineralization/Wuyishan metallogenic belt引用本文复制引用
基金项目
国家重点研发计划项目(2022YFC2903301)
国家自然科学基金项目(42372101)
江西省地质局项目(2024JXDZKJRC06)
出版年
2024
NETL
NSTL
万方数据