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Carbon on Earth and Mars.
| reservoir | abundance (1015 kg) | δ13C (‰) | ||
|---|---|---|---|---|
| Eartha | Mars | Eartha | Mars | |
| atmosphere (CO2) | 0.72 | 6.4 | −7 | >+40 |
| lithosphere (igneous rocks) | 324 000 | 2000 | −5 | −21.2 |
| hydrosphere (sedimentary rocks) | 84 000 | 25–150 | 0±2 | >+30 |
| biosphere (organics) | 1.56 | ? | −27 | ?? |
| input from extraterrestrial dust | 2 | 2b | ||
From DesMarais (2001).
Assuming that the higher flux of material to Mars is approximately balanced by its lower surface area.
