Utility of stable isotope system of tungsten as a paleocean redox proxy based on molecular structure

海洋锰铁氧化物的吸附是控制现代含氧海水中钨的浓度和同位素组成的重要过程。我们通过结构分析和同位素测量，重点研究了W在锰铁氧化物上的浓缩和同位素分馏。我们发现W通过在Fe(O_2O_3)氧化物和Mn_2O_3表面上的内球配位作用改变了其分子对称性，并表现出同位素分馏。

Adsorption on marine ferromanganese oxides is the important process controlling concentration and isotopic composition of tungsten (W) in modern oxic seawater. We focused on the enrichment and isotopic fractionation of W onto ferromanganese oxides by both structural analysis and isotope measurements. We revealed that W changes its molecular symmetry through inner-sphere complexation on the surface of both Fe (oxyhydr)oxides and Mn oxides, and also shows isotopic fractionation.