摘要
通过沉积相、岩石学、矿物学、氧碳同位素和微量元素特征研究,证明块状白云岩的混合水白云石化作用是一个包括交代、重结晶调整和溶蚀充填作用的复杂水-岩反应过程,提出块状白云岩的混合水成因模式。白云石化过程主要受混合水带的孔隙水盐度变化控制,在侧向加积变浅的浅海碳酸盐沉积体系中,混合水带由陆向海方向迁移引起的孔隙水盐度由高向低变化,是控制白云石化过程的水文动力因素。
By the studies of sedimentary facies, petrology, mineralogy, stable isotope (δ^(18)O and δ^(13)C)and trace elements,ect,this paper suggested a mixed water genetic model of massive dolomite. It means that mixed water dolomitization is not a simply process that dolomites replace calcites, but also a complicated reaction between mixed water and sedimnents or rocks,including replacement,recrystallization, regulatization,corrosion and filling, ect. The dolomitization is mainly controlled by changing salinity of porospace water in mixed water zone, and the salinity (sea water 40→10%) is controlled by hydrodynamic factor that the mixed water zone migrates gradually from land to sea. The model is of common significance to explain the genesis of mixed water massive dolomites presented generally in Palaeozoic and Mesozoic platform in the areas of Yunnan, Guizhou and Guangxi province.
出处
《矿物岩石》
CAS
CSCD
1992年第1期55-64,共10页
Mineralogy and Petrology
关键词
白云岩
块状
成因
模式
同位素
mixed water
dolomitization model
massive dolomite
ordering degree
cathodoluminescence
stable isotope(δ^(18)O and δ^(13)C)
trace elements
