Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgre..11108s91f&link_type=abstract
Journal of Geophysical Research, Volume 111, Issue E8, CiteID E08S91
Physics
29
Planetary Sciences: Solar System Objects: Mars, Planetary Sciences: Solid Surface Planets: Impact Phenomena, Cratering (6022, 8136), Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism
Scientific paper
Large-diameter visible and buried impact basins, seen as ``quasi-circular depressions'' (QCDs) in MOLA gridded data, provide a self-consistent chronology for major events on early Mars in terms of N(200) crater retention ages. On the basis of a conversion to model absolute ages, this chronology extends back hundreds of millions of years into a previously unknown ``pre-Noachian'' epoch during which a now buried highlands surface was established, in which several very large impact basins formed while the global magnetic field was still present. A cluster of very large ``lowland-making'' basins occurred at a model age of about 4.13 GY (or earlier), forming the fundamental topography of the Mars crustal dichotomy at a time prior to the age of the oldest visible highland crust. This early event in Martian history marks the transition from the ``pre-Noachian'' to the Early Noachian when the well-preserved Hellas, Argyre, and Isidis basins formed, all after the global magnetic field died.
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