自从Krumbein和Garrels(1952)的经典文献发表以来,沉积物及沉积岩形成的地球化学环境一直以氢离子活度(pH)和氧化-还原电位Eh(有时表示为电子活度pe)作为特征参数。虽然在根据热力学数据算得的Eh-pH及pe-pH图中,这些参数能很好地确定沉积环境中矿物的稳定性,但实际上对从事现代未石化沉积物研究的人员来说,它们并无多大用处。其原因有两个。首先,多数水下沉积物,不管是海相的还是非海相的,它们的pH值相当一致,一般都在6—8之间(笔者对河口及正常海相沉积物作过数百次pH值测量,其中90％以上的测量值落在6.5—7.5范围内)。与 Since the publication of classical literature by Krumbein and Garrels (1952), the geochemical environment formed by sediments and sedimentary rocks has been characterized by hydrogen ion activity (pH) and oxidation-reduction potential Eh (sometimes expressed as electron activity pe). Although these parameters can well determine the stability of minerals in sedimentary environments in the Eh-pH and pe-pH plots based on thermodynamic data, in fact, for those undertaking modern non-petrochemical sediments, Not much use. There are two reasons for this. First, the majority of underwater sediments, whether marine or non-marine, have fairly consistent pH values, typically between 6 and 8 (I have done hundreds of pH studies of estuaries and normal marine sediments Value measurement, of which more than 90% of the measurements fall within the range of 6.5-7.5). versus