Development of a positive Eu anomaly during diagenesis
Development of a positive Eu anomaly during diagenesis
复制标题
DOI：
10.1016/0012-821x(92)90116-d
复制
发表时间：
1992-04
影响因子：
5.3
通讯作者：
N. Macrae;H. Nesbitt;B. Kronberg
中科院分区：
文献类型：
--
作者：
N. Macrae;H. Nesbitt;B. Kronberg
Eu在低氧化电位和近中性溶液中还原为Eu 2+的条件下，可能发生成岩再活化作用，产生相对富集Eu 2+的孔隙沃茨，与其三价稀土邻居不同。Eu在高氧化电位的环境中以3+状态再沉淀。这些过程产生了积极的Eu异常的高度氧化的更新世泥的亚马逊深海扇。类似的情况应该是罕见的，但如果发现它们确实提供了当地成岩过程和条件的宝贵信息。
Diagenetic remobilization of Eu is possible under conditions of reduction to Eu2+at low oxidation potential and near neutral solution, producing pore waters relatively enriched in Eu2+, as distinct from its trivalent REE neighbours. Eu is reprecipitated in the 3+ state in environments of high oxidation potential. These processes have produced positive Eu anomalies in highly oxidized Pleistocene muds of the Amazon deep-sea fan. Similar occurrences should be rare, but where found they do provide valuable information on local diagenetic processes and conditions.