Clusters of Small Closely Spaced Pits in Ejecta-Related Deposits
Reference work entry
Closely spaced pits found in the thin, ejecta-related deposits of well-preserved Martian and Vesta impact craters.
Bowl-shaped depressions that range in size from a few meters to more than ∼3 km in diameter, but most pits are < ∼200 m in diameter. These pits occur on the floors, terraces, and exterior ejecta deposits of fresh craters (Tornabene et al. 2012; Fig. 1). The pits commonly occur in closely spaced groups or clusters whose individual pits are so close together that their rims share straight segments situated between individual pits (Fig. 2). The tendency for the pits in these closely spaced groups to be nearly circular and to share straight rim segments produces a geometry that resembles a 2-D cross section through soap froth or a honeycomb. There are isolated pits that do not exhibit shared rims, but in general pits occur within closely packed groups with rims that do not appear to be raised above the surrounding terrain. In contrast, isolated pits...
- Boyce JM, Wilson L, Mouginis-Mark PJ, Tornabene L, Hamilton CW (2012) Origin of closely spaced groups of pits in Martian impact craters. Icarus. doi:10:1016/jicarus.2012.07.027Google Scholar
- Denevi D, Blewett D, Capaccioni F, De Sanctis MW, Garry MJ, Li JS, Marchi S, McCoy T, Nathues A, Petro N, Raymond C, Russell CP, Schenk PJ, Scully E, Sunshine J, Williams D, Yingst R (2012) Dawn observations of Marcia Crater, Vesta. Lunar Planet Sci Conf XXXXIII, abstract # 2308, HoustonGoogle Scholar
- Mouginis-Mark PJ, Boyce JM, Hamilton VE, Anderson FS (2003) A very young, large, impact crater on Mars. International Mars conference VI, Pasadena, # 3004Google Scholar
- Tornabene L, McEwen A, Osinski G, Mouginis-Mark P, Boyce J, Williams R, Wray J, Grant J (2007) Impact melting and the role of subsurface volatiles: implications for the formation of valley networks and phyllosilicate-rich lithologies on early Mars. International conference on Mars VII. Lunar Planet Science Institute Contribution #1353Google Scholar
- Tornabene L, Boyce J, Bray V, Caudill C, Grant J, Mattson S, McEwen A, Mouginis-Mark P, Osinski G (2012) Discovery of a widespread crater-related pitted unit associated with the freshest and best-preserved Martian craters: new implications for the interaction of volatiles and the impact process. Icarus, Pasadena. doi:org/10.1016/j.icarus.2012.05.022Google Scholar
© Springer Science+Business Media New York 2015