广东大宝山多金属矿床叠加成因:硫化物Re⁃Os和Rb⁃Sr年龄及原位微量元素证据
王磊 , 王祥东 , 胡军 , 金鑫镖 , 张熊 , 谭娟娟
地球科学 ›› 2025, Vol. 50 ›› Issue (07) : 2548 -2565.
广东大宝山多金属矿床叠加成因:硫化物Re⁃Os和Rb⁃Sr年龄及原位微量元素证据
Superimposed Mineralization of Dabaoshan Polymetallic Deposit in Guangdong Province: Evidence from Sulfide Re⁃Os and Rb⁃Sr Dating and In⁃Situ Trace Element Analysis
,
大宝山是钦杭成矿带内一个重要的大型多金属矿床,其是否存在海底喷流沉积成矿作用尚存在争议.对该矿床不同类型的硫化物进行了同位素定年和原位微量元素分析.获得的磁黄铁矿Re-Os和闪锌矿Rb-Sr等时线年龄分别为(366±33)Ma 和(166.3±2.5)Ma.磁黄铁矿整体呈现Co低、Ni高、Se高、Te低的特点,Co/Ni比值几乎均小于1,指示其沉积成因的特征.闪锌矿相对富集Fe、Mn、Cd、Ga、In、Sn等元素,具有较低的Zn/Cd和Cd/Fe比值,较低的Co含量和较高的Sn含量,指示其喷流沉积成因.综合认为大宝山多金属矿床经历了中泥盆世喷流沉积成矿和中侏罗世岩浆热液叠加成矿.在400 ℃左右的成矿温度下,硫化物Re-Os同位素体系保持封闭,原位成分仍记录了早期沉积成因特征,这一发现在华南块状硫化物矿床成因研究中可供借鉴.
The Dabaoshan deposit is a large-sized polymetallic deposit within the Qin-Hang Metallogenic Belt, and it is still controversial whether there has been submarine exhalative sedimentation. In this study, we conducted isotopic dating and in-situ elemental analysis of various sulfides in the deposit, having obtained Re-Os isochron age of (366±33) Ma for pyrrhotites and Rb-Sr isochron age of (166.3±2.5) Ma for sphalerite, respectively. The pyrrhotite is characterized by low concentrations of Co and Te, and high concentrations of Ni and Se, with Co/Ni ratios predominantly below 1, indicating a sedimentary origin. Additionally, sphalerite is relatively enriched in elements such as Fe, Mn, Cd, Ga, In, and Sn, exhibiting relatively low Zn/Cd and Cd/Fe ratios, low Co content, and high Sn content, indicating a sedimentary exhalative origin. Generally, the Dabaoshan polymetallic deposit experienced mineralization through Devonian exhalative sedimentation mineralization, followed by Jurassic magmatic-hydrothermal superimposition. The Re-Os isotope system of sulfides remained stable at a mineralization temperature around 400 °C, preserving the in-situ geochemical signatures of the initial sedimentary processes. The findings provide valuable insights into the genesis of massive sulfide deposits in South China.
磁黄铁矿Re⁃Os定年 / 闪锌矿Rb⁃Sr定年 / 原位微量元素 / 叠加成矿 / 大宝山多金属矿床 / 矿床学.
pyrrhotites Re⁃Os dating / sphalerite Rb⁃Sr dating / in⁃situ composition / superimposed mineralization / Dabaoshan polymetallic deposit / ore deposit
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国家自然科学基金项目(41302068)
国家自然科学基金项目(U2244212)
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