Fig. 4: Rare earth element (REE) patterns of waters from the Caeté River section, tidal station, and of porewater and sedimentary Fe-Mn oxyhydroxides.
From: The Amazonian mangrove systems accumulate and release dissolved neodymium and hafnium to the oceans
a Distributions of Nd and Fe concentrations of Caeté River estuarine waters. The blue dashed line in panel a represents the calculated conservative Nd mixing line between the freshwater and seawater endmembers along the river transect. The second conservative mixing line (green dashed line) for Nd is defined by endmembers representing maximum Nd removal and seawater. b Distributions of Nd and Fe concentrations of intertidal creek water over 10 days of tidal cycles. Fe concentrations are from Knoke et al.43. c REE patterns of Caeté River estuarine waters, d brackish intertidal creek water, e porewater and labile Fe-Mn oxyhydroxides coatings of sediment. Sample salinities are indicated by the color bar in each panel. All REE patterns are normalized to PAAS90. The REE pattern of labile Fe-Mn oxyhydroxides is scaled down by a factor of 1000 to facilitate comparison. The REE patterns of Caeté estuarine waters (Sal: 20, solid gray line) were added for comparison and magnified by factors of 3 and 5 in panel e.
