论文部分内容阅读
在布莱斯金(Briskin)和施雷贝尔(Schreiber,1978)的论文中,曾论述过在海洋沉积物中赋存自生板状石膏晶体的问题。他们认为,这种石膏的形成模式是:在海洋相对静止的海底表面,当富氧而含Ca~(2+)和CO_3~(2-)不饱和的底层水,在短暂的时期内形成的。并进一步指出:在碳酸钙饱和的海底表层,堆积着钙质贝壳物质(主要是浮游和底栖有孔虫),而在沉积物中则含有硫酸根离子(生物死亡后分解作用过程所产生),当富氧贫钙——碳酸盐底层水,流经这样海底时,将导致沉积物中钙——碳酸盐含量的减少,并促使从沉积物中沉淀出石膏晶体(由于沉积孔隙水中有过饱和的钙和硫酸根离子)。如果该富氧的底层水能持续一段较长的时间,那么首先可使浮游生物产量剧增,继之使沉积物中的有机质大大增加。有机质不断地供给、改变沉积微环境,致使在需氧的
In papers by Briskin and Schreiber (1978), the problem of the presence of spontaneous plate-shaped gypsum crystals in marine sediments has been discussed. In their opinion, the formation pattern of gypsum is as follows: when the oxygen-rich sub-surface water containing Ca 2+ and CO 3 2- is formed in a relatively short period of time on the relatively seabed surface of the ocean . And further pointed out that: in the calcium carbonate saturated surface layer of the sea, the accumulation of calcareous shell material (mainly planktonic and benthic foraminifera), while in the sediment contains sulfate ions (biological death after the decomposition process) , When oxygen-poor calcium-carbonate bottom water, flowing through such seafloor, results in a reduction of calcium-carbonate content in the sediment and causes the precipitation of gypsum crystals from the sediment (due to the deposition of pore water Supersaturated calcium and sulfate ions). If the oxygen-rich subterranean water lasts for a longer period of time, then first increase in plankton yield, followed by a substantial increase in the organic matter in the sediment. The continuous supply of organic matter, altering sediment microenvironment, resulting in aerobic