Fig. 2: δ238U in waters and solids.
From: Deep anoxic aquifers could act as sinks for uranium through microbial-assisted mineral trapping
δ238U in fracture water (blue squares) and calcite (green rhombs) samples collected from the borehole equipment at 415 m depth in KA3105A borehole, Äspö. FW #22970 refers to calcite #22132 and FW #22968 refers to calcite #22125. For calcite sample #22134, no water sample is available. Dashed lines at –1.90‰ and –2.10‰ are plotted for reference relevant to the fluid-solid setting. Error bars represent δ238U = 0.12‰ as ±2σ. δ238U values for modern continental crust and seawater are –0.29(3)‰ (2σ) and –0.39(1)‰ (2σ), respectively90.
