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

Total extrusive and intrusive magma generated on Mars over the last ~3.8 billion years is estimated at 654 × 10^6 cubic kilometers, or 0.17 cubic kilometers per year (km^3/yr), substantially less than rates for Earth (26 to 34 km^3/yr) and Venus (less than 20 km^3/yr) but much more than for the Moon (0.025 km^3/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.