CLAY MINERAL PRECIPITATION AND TRANSFORMATION DURING BURIAL DIAGENESIS
CLAY MINERAL PRECIPITATION AND TRANSFORMATION DURING BURIAL DIAGENESIS
复制标题
DOI：
10.1098/rsta.1985.0031
复制
发表时间：
1985-01-01
期刊：
影响因子：
5
通讯作者：
CURTIS, CD
中科院分区：
文献类型：
--
作者：
CURTIS, CD
碎屑粘土矿物在埋藏成岩作用中发生了系统的变化。蒙皂石通过中间的“伊利石-蒙皂石”演化为伊利石。三八面体的“绿土-绿泥石”或“蛭石-绿泥石”向真正的（多型Ib）绿泥石演化。在其他反应中，自生粘土（高岭石，伊利石，高岭土）直接从水溶液中沉淀，而不是通过一些前体晶格的连续改性。在另一些情况下，一种矿物取代了另一种矿物。这些反应中有许多受到有机质及其成岩和热成熟的各种低分子量可溶产物的影响。二氧化碳和有机酸影响孔隙水的pH值，这反过来又影响粘土矿物的溶解度。三八面体层状硅酸盐特别敏感。相反，当氧化铁（III）不稳定时，有机物也起还原剂的作用，产生Fe 2+和显着增加碱度。该反应稳定了三八面体粘土，如chamosite。这些不同反应之间的平衡影响了粘土矿物成岩作用的过程，并且其本身随埋藏深度和温度而系统地变化。
Detrital clay minerals alter systematically during burial diagenesis. Smectites evolve via intermediate ‘illite-smectites’ to illite. Trioctahedral ‘smectite-chlorites’ or ‘vermiculite-chlorites’ evolve towards true (polytype Ib) chlorites. In other reactions, authigenic clays (kaolinite, illite, chlorite) precipitate directly from aqueous solution rather than by continuous modification of some precursor lattice. In yet others, one mineral replaces another. Many of these reactions are influenced by organic matter and the various low molecular mass soluble products of its diagenetic and thermal maturation. Carbon dioxide and organic acids influence pore-water pH and this, in turn, affects the solubility of clay minerals. Trioctahedral phyllosilicates are particularly sensitive. In contrast, organic matter also acts as a reducing agent when iron (III) oxides are destabilized to produce Fe2+and a marked increase in alkalinity. This reaction stabilizes trioctahedral clays such as chamosite. The balance between these different reactions affects the course of clay mineral diagenesis and itself varies systematically with burial depth and temperature.