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Lunar mare volcanism - Stratigraphy, eruption conditions, and the evolution of secondary crustsRecent developments in the geological analysis of lunar mare volcanism are reviewed. Analysis of returned samples and photogeological and remote sensing studies shows that mare volcanism began prior to the end of heavy bombardment (the period of cryptomare formation), in pre-Nectarian times, and continued until the Copernical Period, the total duration approaching 3.5-4 Ga. Stratigraphic analysis shows that the flux was not constant, but peaked in early lunar history, during the Imbrian Period. Average volcanic output rate during this period was about 0.01 cu cm/a. Volcanic landforms indicate that many eruptions were of high volume and long duration. Some eruptions associated with sinuous rills may have lasted a year and emplaced 1000 cu km of lava, representing the equivalent in one year of about 70,000 yr at the average flux. The occurrence of farside maria within craters whose diameter is generally near to or less than the thickness of the crust may be accounted for by the difference between local and regional compensation.
Document ID
19920062093
Document Type
Reprint (Version printed in journal)
Authors
Head, James W., III (Brown University Providence, RI, United States)
Wilson, Lionel (Brown University Providence, RI; Lancaster, University, United Kingdom)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 56
Issue: 6 Ju
ISSN: 0016-7037
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NGR-40-002-088
CONTRACT_GRANT: NAGW-713
Distribution Limits
Public
Copyright
Other