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Mineralogical indicators of Mercury's hollows composition in MESSENGER color observations
Author(s) -
Vilas Faith,
Domingue Deborah L.,
Helbert Jörn,
D'Amore Mario,
Maturilli Alessandro,
Klima Rachel L.,
StockstillCahill Karen R.,
Murchie Scott L.,
Izenberg Noam R.,
Blewett David T.,
Vaughan William M.,
Head James W.
Publication year - 2016
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 - 10.1002/2015gl067515
Subject(s) - geology , mineralogy , impact crater , mercury (programming language) , astrobiology , physics , computer science , programming language
Early during MErcury Surface Space ENvironment GEochemistry, and Ranging (MESSENGER)'s orbital mission, the Mercury Dual‐Imaging System imaged the landform called hollows on the two craters Dominici and Hopper, using its Wide‐Angle Camera with eight narrowband color filters ranging from 433 to 996 nm. An absorption feature centered in the MDIS 629 nm filter is evident in reflectance spectra for Dominici's south wall/rim hollows. A different absorption feature found in photometry of Dominici's center hollows extends through the MDIS 828 nm filter. Hollows in Hopper exhibit a weaker spectral absorption feature than that observed in Dominici's center. At Dominici, we postulate that fresher hollows‐hosting material in the wall/rim was exposed to the space environment through a process of slumping of the overlying material. With time, local and global processes darken the hollows and change or mix the surface mineralogy, so that the spectral signature evolves. The hollows could contain low‐density MgS and an opaque component, potentially derived from background material.