Magma Generation on Mars: Amounts, Rates, and Comparisons with Earth, Moon, and Venus

@article{Greeley1991MagmaGO,
  title={Magma Generation on Mars: Amounts, Rates, and Comparisons with Earth, Moon, and Venus},
  author={Ronald Greeley and Byron D. Schneid},
  journal={Science},
  year={1991},
  volume={254},
  pages={996 - 998}
}
Total extrusive and intrusive magma generated on Mars over the last ∼3.8 billion years is estimated at 654 x 106 cubic kilometers, or 0.17 cubic kilometers per year (km3/yr), substantially less than rates for Earth (26 to 34 km3/yr) and Venus (less than 20 km3/yr) but much more than for the Moon (0.025 km3/yr). When scaled to Earth's mass the martian rate is much smaller than that for Earth or Venus and slightly smaller than for the Moon. 

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