Table 2 Oceanic magnesium fluxes (Tmol yr−1).
From: New isotope constraints on the Mg oceanic budget point to cryptic modern dolomite formation
This study Minimum fluxes scenario | This study Maximum fluxes scenario | This study 50% Silicate weathering scenario | Wilkinson and Algeo25: Modern (average Phanerozoic) | Holland2 | Higgins and Schrag40: Cenozoic range | Gothmann et al.41: Cenozoic range | ||
|---|---|---|---|---|---|---|---|---|
Input rivers | 5.5 | 5.5 | 3.9 | 5.2 (5.4) | 6.1 | 4.9 | 4.0–4.7 | 4.5 |
Increment to seawater | 1.6 | 0.7 | 0.7–1.6 | 0 | 1.7 | 0 | 0.4–1.4 | 0.4–1.4 |
Total outputs | 3.9 | 4.8 | 2.3–3.2 | 5.2 | 4.4 | 4.9 | – | – |
High-T hydrothermal | 0.24–1.4 | 0.24–1.4 | 0.24–1.2a | 5.1 (2.2)b | 2.0 | 2.6b | 1.4–1.6 | 1.7–2.5b,c |
Low-T hydrothermal | 1.0–1.6c | 1.1–1.7c | 0.0–0.6c | – | 0.4c | – | 0.6–1.5c | – |
Dolomite | 1.5–2.0 | 2.3–2.9 | 1.1–2.4 | 0.1 (1.8) | 1.7 | 0.1 | 0.75–1.0 | 0.75–1.75 |
Other | – | – | – | – | 0.3 (Cation exchange) | 2.2 (Chlorite) | – | – |
