陈宪,黎敦朋,崔碧云.福建李坊重晶石矿床中硅质岩硅、氧同位素组成及成因意义[J].地质找矿论丛,2020,35(2):154-160
福建李坊重晶石矿床中硅质岩硅、氧同位素组成及成因意义
Silicon and oxygen isotopic composition of siliceous rocks in the Lifang barite deposit, Fujian province and its genetic significance
投稿时间:2020-01-07  
DOI:10.6053/j.issn.1001-1412.2020.02.004
中文关键词:  李坊重晶石矿床  硅氧同位素  热水沉积  燧石-海水氧同位素地质温度计  福建省
英文关键词:Lifang barite deposit  silicon and oxygen isotope  hot water deposition  flint-seawater oxygen isotope geological thermometer  Fujian province
基金项目:国家科学基金项目(编号:41872220)、福建省自然科学基金项目(编号:2017J01467)联合资助。
作者单位
陈宪 福州大学紫金矿业学院, 福州 350108 
黎敦朋 福州大学紫金矿业学院, 福州 350108 
崔碧云 福州大学紫金矿业学院, 福州 350108 
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中文摘要:
      福建李坊大型重晶石矿床围岩中发育层状硅质岩,为了研究硅质岩的成因,本文对14件硅质岩样品进行了硅、氧同位素分析。结果表明:δ30Si)分布范围为-0.3×10-3~+0.1×10-3,平均值为-0.1×10-3δ18O)分布范围为10.6×10-3~18.9×10-3,平均值为14.7×10-3。基于该层状硅质岩的δ30Si)和δ18O)分布范围特征,结合野外地质调查研究工作的认识,该硅质岩应为原生沉积成因,二氧化硅来源于热水沉积;根据燧石-海水氧同位素地质温度计估算石英的形成温度为100.2℃—198.7℃,平均值为146.0℃,即该硅质岩形成于热水沉积,暗示李坊重晶石矿床形成于热水沉积作用。
英文摘要:
      Layered siliceous rocks are developed in the surrounding rocks of the large-scale barite deposit in Lifang, Fujian province. In order to study the genesis of siliceous rocks silicon and oxygen isotopes of 14 siliceous rock samples are analyzed. The results show that the value of δ(30Si) is-0.3×10-3~+0.1×10-3, with an average of-0.1×10-3;the value of δ(18O) is 10.6×10-3~18.9×10-3, average value of 14.7×10-3. Based on the δ(30Si) and δ(18O) distribution range characteristics of the layered siliceous rock, combined with the field geological survey and research work, it is considered that siliceous rocks are in the original sedimentary genesis. Silica precipitated from hot water. By the flint-sea water oxygen isotope geological thermometer quartz is estimated to form at temperature of around 100.2℃—198.7℃, with an average value of 146.0℃, that is, the siliceous rock was formed in hot water deposition, suggesting that the Lifang barite deposit was formed in hot water deposition.
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