摘要
沉积型天青石矿床和蒸发岩类 ,特别是石膏的沉积密切相关 ,含矿地层主要是纹层状叠层石或藻灰岩。天青石中硫、锶同位素值和海水硫、锶同位素值相近。在蒸发条件下海水浓缩到一定浓度时 ,产生天青石沉积 ,或是富锶的硫酸型晶间卤水和钙碳酸盐反应 ,形成交代型天青石。天青石主要分布于蒸发盐盆地的边缘部位 。
A sedimentary celestine deposit has a close link with evaporite sediments, particularly associated with gypsum phase, with the ore hosting rocks prodominated by laminated stromatolite and algal limestone.Compositions of S and Sr isotopes for celestine are similar to those for general sea waters. On sea water evaporation until a critical concentration, or, alternatively, reaction of Sr rich,sulfate type,intercrystalline brine with carbonate may form respectively sedimentary and metasomatic celestines.This bi genetic mineral distributes essentially on marginal parts of evaporitic basins in transpositional zones of carbonate facies to sulfate one.
出处
《化工矿产地质》
CAS
1998年第1期32-37,共6页
Geology of Chemical Minerals
关键词
天青石矿床
藻灰岩
矿床成因
地质特征
celestine deposit, laminated stromatolite, algal limestone, evaporite, sedimentation mechanism
