水库现代沉积过程沉积磷的早期成岩作用模型研究  

EARLY DIAGENESIS MODEL OF SEDIMENTARY PHOSPHORUS IN A RESERVOIR

作　　者：朱俊[1] 王雨春[2] 万国江[1] 刘丛强[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳550002 [2]中国水利水电科学研究院水环境研究所

出　　处：《矿物学报》2006年第3期296-302,共7页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(批准号:40103008)

摘　　要：在沉积磷形态分析、孔隙水化学、核素计年以及吸附解吸实验等的基础上,运用一维“反应-平流-扩散”模型,研究了红枫湖现代沉积过程中磷的沉积改造。结果表明:红枫湖现代沉积过程中,有机态磷的矿化分解和铁结合态磷的络合/溶解,是控制沉积物磷迁移转化动力学的主要机制。沉积物-水界面附近有机磷的快速降解,可能克服沉积界面上铁氧化物对溶解磷的吸附缓冲,而形成向水体的磷酸盐迁移通量;自生磷灰石的沉积改造相对不明显,沉积磷向稳定形态含磷矿物(钙氟磷灰石)的转化过程同样不能影响红枫湖现代沉积过程中磷转化的质量平衡。To shed more quantitative insight into the redistribution of sedimentary P with depth, based on the data from pore water analysis, solid phase P analysis, sedimentary nuclide chronology and sorption experiment, a mathematical model describing the sedimentary P cycle was applied. The result of this study indicated that the mineralization of organic P and the dissolution of Fe-bound P are the major mechanisms by which the sedimentary P dynamics was controlled during the burial processes of sediments in Hongfeng Lake. The model calculation also showed that the amount of dissolved phosphate provided by organic P mineralization in the surface sediment zone was larger than that absorbed by ferriferous oxide, as a result, there is a potential upward flux of phosphate from sediments to overlying waters. Meanwhile, the result of the model calculation suggested that the processes of authigenic P formation and carbonate fluorapatite are of no significance in mass balance of sedimentary P during the early diagenesis of sediments in Hongfeng Lake.

关 键 词：沉积磷 早期成岩作用模型 红枫湖水库 

分 类 号：P594[天文地球—地球化学] X142[天文地球—地质学]