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Deep (>0.8km depth) fracture water with residence time estimates on the order of several Ma from the Witwatersrand Basin, South Africa contains up to 40μM of NO 3− , up to 50mM N 2 (90 times air saturation at surface) and 1 to ~400μM NH 3 /NH 4+ . To determine whether the oxidized N species were introduced by mining activity, by recharge of paleometeoric...
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