摘要
查明黔西南贞丰等地冰洲石矿床的成矿温度为126~160℃,成矿压力为(260~520)×105Pa;成矿流体盐度(SNaCl)为12.2%~19.6%。研究了不同成矿阶段方解石、冰洲石的氢、氧、碳同位素组成及变化特征:其中冰洲石成矿阶段δ18O值为16.24~18.48‰,平均17.36‰;W/R为0.16~0.18。而从薄层方解石阶段到冰洲石成矿阶段δDH2O=-49~-68‰。δ13C(PDB)=-0.60~0.73‰,δ13CCO2(PDB)为-0.37~2.43‰。计算出δ13C∑C=-2.08~-2.49‰。研究表明成矿流体来源于大气降水与加热的地下水的混合,碳来源于地层。探讨了冰洲石成矿时特定的物理化学条件及地质环境。
It has been established that the homogenization temperature of iceland spar deposits ranges from 126~160℃ and the ore forming pressure from 260~520×10 5 Pa in a certain location of Southwest Guizhou province.The salinity of ore forming fluid is measured in the range of 12.2~19.6%.Isotopic composition of oxygen,hydrogen and carbon has been studied.In this deposit,iceland spar has δ 18 O value of 16 24~18.48‰,on the average 17.36‰.W/R is 0.16~0.18,δD H 2O is -49‰~-68‰ from calcite to iceland spar stages.δ 13 C (PDB) is -0.60~0.73‰.δ 13 C CO 2 (PDB) is -0 37~2 43‰.The calculation is δ 13 C ∑C =-2 08~-2 49‰.The study shows that the ore forming fluid originates in comosite of meteoric water and heating underground water.Carbon comes from the limestone wallrock.The special physico chemical conditions and environment for forming iceland spar have been discussed.
出处
《贵州工业大学学报(自然科学版)》
CAS
1999年第4期27-31,109,共6页
Journal of Guizhou University of Technology(Natural Science Edition)
基金
贵州省科学技术基金
关键词
冰洲石矿床
矿床地球化学
黔西南
贵州
iceland spar
ore forming geochemistry
hydrogen,oxygen and carbon isotopes
Southwest Guizhou