Steady-state flow of solid CO2: Preliminary results
Geophysical Research Letters
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Abstract
To help answer the question of how much solid CO2 exists in the Martian south polar cap, we performed a series of laboratory triaxial deformation experiments at constant displacement rate in compression on jacketed cylinders of pure, polycrystalline CO2. Test conditions were temperatures 150 < T < 190 K, hydrostatic confining pressures 5≤ P ≤40 MPa, and strain rates 4.5×10−8 ≤ ε ≤4.3×10−4 s−1. Most of the measurements follow a constitutive law of the form ε = Aσnexp(−Q/RT), where σ is the applied differential stress, R is the gas constant, and the other constants have values as follows: A = 103 86 MPa−ns−1, n = 5.6, and Q = 33 kJ/mol. Solid CO2 is markedly weaker than water ice. Our results suggest that the south polar cap on Mars is unlikely to be predominately solid CO2, because the elevation and estimated age of the cap is difficult to reconcile with the very weak rheology of the material.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Steady-state flow of solid CO2: Preliminary results |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/1999GL008373 |
| Volume | 26 |
| Issue | 23 |
| Year Published | 1999 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Earthquake Science Center |
| Description | 4 p. |
| First page | 3493 |
| Last page | 3496 |
| Other Geospatial | Mars |
| Google Analytic Metrics | Metrics page |