Table 1.
Different crust models
| Description | Case # | North |
South |
Deviation (°) | ||||
|---|---|---|---|---|---|---|---|---|
| U | M | L | U | M | L | |||
| Compositions (Northern crust: B, G, and P/Du) | 11 | B | G | P/Du | A | G | P/Du | −6.5 |
| 12 | B | G | P/Du | A + 1% | G + 1% | P/Du + 1% | −12.4 | |
| 13 | B | G | P/Du | A + 2% | G + 2% | P/Du + 2% | −12.4 | |
| 14 | B | G | P/Du | B | T | P/Du | −6.2 | |
| 15 | B | G | P/Du | B + 1% | T + 1% | P/Du + 1% | −10.2 | |
| 16 | B | G | P/Du | B + 2% | T + 2% | P/Du + 2% | −11.5 | |
| 17 | B | G | P/Du | A | T | P/Du | −8.7 | |
| 18 | B | G | P/Du | A + 1% | T + 1% | P/Du + 1% | −12.3 | |
| 19 | B | G | P/Du | A + 2% | T + 2% | P/Du + 2% | −13.0 | |
| Compositions (Northern crust: D, D, and D) | 21 | D | D | D | A | D | D | 3.1 |
| 22 | D | D | D | A + 1% | D + 1% | D + 1% | 0.8 | |
| 23 | D | D | D | A + 2% | D + 2% | D + 2% | −1.9 | |
| 24 | D | D | D | B | T | D | 5.5 | |
| 25 | D | D | D | B + 1% | T + 1% | D + 1% | 2.1 | |
| 26 | D | D | D | B + 2% | T + 2% | D + 2% | 0.4 | |
| 27 | D | D | D | A | T | D | 2.4 | |
| 28 | D | D | D | A + 1% | T + 1% | D + 1% | −0.3 | |
| 29 | D | D | D | A + 2% | T + 2% | D + 2% | −3.5 | |
| Partial melt ratios for southern crust | 30 | D | D | D | D | D | D | 7.9 |
| 31 | D | D | D | D + 1% | D | D | 3.0 | |
| 32 | D | D | D | D + 1% | D + 1% | D | 5.1 | |
| 33 | D | D | D | D + 1% | D + 1% | D + 1% | 5.5 | |
| 34 | D | D | D | D + 2% | D | D | −1.4 | |
| 35 | D | D | D | D + 2% | D + 2% | D | 3.2 | |
| 36 | D | D | D | D + 2% | D + 2% | D + 2% | 3.6 | |
| 37 | D | D | D | D | D | D + 1% | 7.5 | |
| 38 | D | D | D | D | D | D + 2% | 7.5 | |
| 39 | D | D | D | D + 1.6% | D | D | −0.2 | |
| Partial melt ratios for A-E antipode | 40 | D | D | D | D | D | D | −27.8 |
| 41 | D | D | D | D + 1% | D | D | −25.8 | |
| 42 | D | D | D | D + 2% | D | D | −21.6 | |
| 43 | D | D | D | D + 3% | D | D | −15.7 | |
| 44 | D | D | D | D + 4% | D | D | −8.7 | |
| 45 | D | D | D | D + 5% | D | D | 2.5 | |
| 46 | D | D | D | D + 4.8% | D | D | −0.1 | |
See supplemental Table 2 for compositional abbreviations. U, upper crust, ∼16.7 km; M, middle crust, ∼16.7 km; L, lower crust, ∼16.7 km. Every 1% melting indicates 7.9% reduction for S wave velocity (Vs) and 3.6% reduction for P wave velocity (Vp) and density.28 Default Martian crustal composition (D), velocities of basalt (B), Gabbro (G), andesite (A), tonalite (T), pyroxinite (P), dunite (Du), pyroxinite/dunite (P/Du) are obtained from the previous study (see Table S1). Percentages in the table indicate melt ratios.