Table 2 U content, δ238U and 234U/238U measured in calcite and fracture water (FW) samples, collected from borehole sections at Äspö HRL.

From: Deep anoxic aquifers could act as sinks for uranium through microbial-assisted mineral trapping

Sample, ID

U, µg/L

U, ppm

δ238U, ‰

234U/238U, activity ratio

FW1, #22970

0.47

—

−2.17

4.8728

FW2, #22968

0.71

—

−1.90

4.8402

Calcite1, #22132

—

8.86

−2.08

4.4693

Calcite2, #22125

—

2.03

−1.93

4.6996

Calcite3, #22134

—

1.95

−1.91

4.8320

  1. FW #22970 refers to calcite #22132 and FW #22968 refers to calcite sample #22125. No FW is available for calcite sample #22134. Uncertainties at ±2σ are for δ238U = 0.12‰ and for AR 234U/238U = 0.0015 u.
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