摘要
江汉盆地江陵凹陷深处赋存高温富钾卤水,含卤地层主要是古新统沙市组。富钾卤水的分布受持续的继承性沉降中心(洼陷)、沙市组含盐系、石盐-硫酸盐沉积相的控制,聚集在砂岩、玄武岩、辉绿岩和白云岩等孔隙-裂隙内,裂隙的发育又与局部构造(背斜、盐构造等)枢纽部共轭裂隙带有关。古新世,盐湖已经蒸发浓缩到钙芒硝-石盐阶段,可能短暂达到硫酸镁盐和硫酸钾镁盐阶段。以后,原生的晶间卤水在成岩后期受到玄武岩侵入和高温流体影响,发生变质作用、去镁和去硫酸根作用,同时带入丰富的钾、铷、铯等元素,最后形成了高温富钾卤水。这种成矿过程可称为地下热事件激发成矿机制,值得进一步探讨。
The potassium-bearing brine with higher temperature had been discovered since 1970s in Jiangling depression of Hubei Province,and the brine mainly being stored in Shashi group of Eocene series.The distribution of brine are controlled by the subsiding center,stratum,halite-sulfates phase.The brine is cumulated in pores and cranies of sand rock,basalt,diabase,dolomite rock;the growth of cranies has been related with conjugate fractures in hinges of anticlines and salt structures.During Eocene epoch,salt lake had evolved to the glauberite and halite-crystalizing stage,or maybe reaching the K-Mg sulfate stage in impermanency.Afterward,in diagenesis the primary intercrystal brine was impacted by the invading of basalt and high temperature fluid,in the result,the metamorphose of brine had taken place,resulting in the removal of Mg and sulfate from brine,meanwhile plenty of K,Rb,Cs and so on had been brought into the brine,thus,the potassium-beaing brine had been formed.The brine formation is activated by the underground hot event resulting from volcanic activites.
出处
《化工矿产地质》
CAS
2011年第2期65-72,共8页
Geology of Chemical Minerals
关键词
江陵凹陷
高温卤水
钾盐
古近纪
玄武岩
Jiangling depression
high-temperature brine
pleogene
Eocene
basalt
