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Rare earth element distributions in the Arabian Sea reveal the influence of redox processes within the oxygen deficient zone
Chemical Geology ( IF 3.9 ) Pub Date : 2021-05-04 , DOI: 10.1016/j.chemgeo.2021.120214
Alexis E. Floback , James W. Moffett

The Arabian Sea is a dynamic system driven by intense monsoon cycling, water mass interactions, and a persistent oxygen deficient zone (ODZ). It has been an area of much interest due to high primary productivity with the potential to act as a major source of climatically important gases, nitrous oxide and dimethylsulfide, and a sink for fixed nitrogen. Trace metal geochemistry is influenced by complex physics and biology within the Arabian Sea, and by inputs from continental margins that surround it on three sides. Rare earth elements (REE) and manganese have been studied on a transect through the Arabian Sea during the southwest monsoon in 2007. Fractionation within the REE series (especially cerium) and comparison with manganese and previously published iron data show the importance of redox gradients within the ODZ and transport from the continental margin. Shale-normalized patterns of the entire series reveal the importance of aeolian deposition, but also reveal that some dust may have been significantly altered by weathering before deposition, with important implications for other metals. Hydrographic data, a slightly positive europium anomaly, and Fe and Mn data give evidence for hydrothermal input from the Gulf of Aden. Interactions between the hydrothermally-derived, shelf-driven, and aeolian deposition inputs make it difficult to ascertain the inputs directly, but there is supporting evidence for all three.



中文翻译:

阿拉伯海中的稀土元素分布揭示了缺氧区中氧化还原过程的影响

阿拉伯海是一个动态系统,由强烈的季风循环,水团相互作用和持续的缺氧区(ODZ)驱动。由于具有很高的初级生产力,它成为气候重要气体,一氧化二氮和二甲基硫的主要来源以及固定氮汇的潜力,因此成为一个备受关注的领域。痕量金属地球化学受到阿拉伯海内部复杂的物理学和生物学的影响,也受到围绕其三面的大陆边缘的输入的影响。2007年西南季风期间,通过阿拉伯海的一个样带研究了稀土元素(REE)和锰。REE系列(尤其是铈)中的分馏以及与锰和先前发表的铁数据的比较表明,ODZ内氧化还原梯度和从大陆边缘运移的重要性。整个系列的页岩归一化模式揭示了风沙沉积的重要性,但同时也揭示了一些粉尘可能在沉积前因风化而发生了明显变化,这对其他金属也具有重要意义。水文数据、,异常略为正,铁和锰数据为亚丁湾的热液输入提供了证据。热液衍生的,陆架驱动的和风沙沉积输入之间的相互作用使得很难直接确定输入,但是对于这三个输入都有支持的证据。整个系列的页岩归一化模式揭示了风沙沉积的重要性,但同时也揭示了一些粉尘可能在沉积前因风化而发生了显着变化,这对其他金属也具有重要意义。水文数据、,异常略为正,铁和锰数据为亚丁湾的热液输入提供了证据。热液衍生的,陆架驱动的和风沙沉积输入之间的相互作用使得很难直接确定输入,但是对于这三个输入都有支持的证据。整个系列的页岩归一化模式揭示了风沙沉积的重要性,但同时也揭示了一些粉尘可能在沉积前因风化而发生了明显变化,这对其他金属也具有重要意义。水文数据、,异常略为正,铁和锰数据为亚丁湾的热液输入提供了证据。热液衍生的,陆架驱动的和风沙沉积输入之间的相互作用使得很难直接确定输入,但是对于这三个输入都有支持的证据。Fe和Mn数据为亚丁湾的热液输入提供了证据。热液衍生的,陆架驱动的和风沙沉积输入之间的相互作用使得很难直接确定输入,但是对于这三个输入都有支持的证据。Fe和Mn数据为亚丁湾的热液输入提供了证据。热液衍生的,陆架驱动的和风沙沉积输入之间的相互作用使得很难直接确定输入,但是对于这三个输入都有支持的证据。

更新日期:2021-05-04
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