Fluid Inclusions and H-O Isotopic Characterization of Shoushan Stone Deposits in Fuzhou and Its Significance for Genesis of Deposits
Zhu Lyuyun
Meng Wei
Yang Zhong
Xu Wen
Li Yujuan
Zhan Xutao
Chen Runsheng
Abstract：As one of the four most famous carving stones in China,Shoushan stone is mainly produced in the Fuzhou volcanic basin and formed by alteration between acidic volcanic rocks and hydrothermal fluids.The characteristics of ore-forming fluid are the key to understanding the mineralization and exploration model.The hydrothermal quartz from Shoushan stone deposit was sampled for the experiment of fluid inclusions and H-O isotopes.The thermodynamic tool is also adopted to quantify the conditions for the formation of Shoushan stone containing kaolinite group minerals.All fluid inclusions in quartz consist of volatile-liquid phases.The homogenization temperatures are 197 ℃ and 211 ℃ for samples from Liuping sample,and 245 ℃ for that from Gaoshan.The δ18OV-SMOW values of quartz are 8.3‰ and 8.4‰,and the δDV-SMOW values of quartz are-61‰ and-83‰.Combined with the H-O isotope results of kaolinite from previous research,the H-O isotope of fluid is calculated theoretically under different temperatures(150℃,200℃and 250℃),which demonstrates that the ore-forming fluid is a mixture of magmatic and meteoric water.By the addition of meteoric water,the temperature,salinity and pH of magmatic-hydrothermal fluids,hydrothermal fluids are made more suitable for the formation of clay minerals.Then,the long-term water-rock reaction leads to the sufficient alternation of acidic volcanic rocks,forming a variety of Shoushan stones.This study improves the mineralization model of Shoushan stone and provides insights into the exploration of metallic and non-metallic deposits caused by epithermal hydrothermal alteration.
Keywords：Shoushan stonefluid inclusionH-O isotopefluid sourcemineralization conditionore deposit
Publication Date：2025-07-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 2707-2719 )