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Mare Crisium: Regional stratigraphy and geologic history
Author(s) -
Adams John B.,
Head James W.,
McCord Thomas B.,
Pieters Carle,
Zisk Stanley
Publication year - 1978
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl005i004p00313
Subject(s) - geology , stratigraphy , structural basin , impact crater , ejecta , geologic map , subsidence , geomorphology , paleontology , tectonics , physics , quantum mechanics , astronomy , supernova
Spectral reflectance measurements of five Luna 24 samples and new telescopic reflectance spectra of 10‐20 km areas of seven sites in Mare Crisium have been used to calibrate multispectral images of mare units. Based on these data, three major mare units are defined in the Crisium basin and their stratigraphy is interpreted. The oldest mare unit is exposed in the ejecta of the craters Picard and Peirce and along the outer edge of the southeastern part of the basin. The next younger unit includes the Luna 24 site and generally follows a topographic annulus along the basin margin. The youngest mare unit occupies the central part of the basin. It is concluded that subsidence occurred throughout the emplacement of mare units, including extensive warping and downfaulting of the inner part of the Crisium basin.