The history of mare volcanism in the Orientale Basin: Mare deposit ages, compositions and morphologies

Details The history of mare volcanism in the Orientale Basin: Mare deposit ages, compositions and morphologies The history of mare volcanism in the Orientale Basin: Mare deposit ages, compositions and morphologies

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..745k&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 745-746 (SEE N94-16173 03-91)

Mathematics

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Basalt, Deposits, Lunar Craters, Lunar Far Side, Lunar Maria, Volcanology, Galileo Spacecraft, Lunar Orbiter 4, Titanium Oxides, Zond 8 Space Probe

Scientific paper

The eruptive history of mare basalts in the Orientale Basin has been studied, using Lunar Orbiter 4 high-resolution photographs, Zond 8 photographs, and recently acquired Galileo EM-1 multispectral images. This work represents a refined set of compositional data incorporating the use of a linear mixing model for mare compositions, crater count data, and a comprehensive morphologic analysis of Orientale Basin mare deposits. Evidence for multiple eruptive episodes has been found, with compositions ranging from medium- to high-Ti basalt (less than 4 to greater than 6 wt. percent TiO2). Eruptive styles included flood, rille-forming, and shield-forming eruptions. Impact crater densities of mare units in the Orientale Basin enable determination of the ages of these deposits, using the method of Neukum et al. Earliest eruptions of mare basalt in the basin occurred at greater than or equal to 3.80 Ga and the latest eruptions occurred at about 2.3-2.5 Ga. Hence, mare volcanism occurred over a period of nearly 1.5 Ga.

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