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    Stratigraphy and composition of lava flows in Mare Nubium and Mare Cognitum

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    Author
    Bugiolacchi, Roberto
    Spudis, Paul D.
    Guest, John E.
    Issue Date
    2006-01-01
    Keywords
    Lunar mare
    lunar volcanism
    Lunar geology
    
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    Citation
    Bugiolacchi, R., Spudis, P. D., & Guest, J. E. (2006). Stratigraphy and composition of lava flows in Mare Nubium and Mare Cognitum. Meteoritics & Planetary Science, 41(2), 285-304.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656105
    DOI
    10.1111/j.1945-5100.2006.tb00210.x
    Additional Links
    https://meteoritical.org/
    Abstract
    Three major periods of basaltic activity characterize the infill of the basins. Each of these periods was itself punctuated by discrete phases of widespread magma eruptions: three during both the Late Imbrian Epoch and the early Eratosthenian Period and then two in the late Eratosthenian Period. We found the youngest lavas off the eastern border of the Fra Mauro peninsula and, mantling a much larger area, over most of the central western Nubium basin.Our results place the Nubium/Cognitum basalts in the low-Ti category (1-5 wt% TiO2).The data indicate that the majority (~90%) of the mare terrain has iron content between 18 and 22 wt%. In particular, FeO contents tend to concentrate toward two compositional poles, each of ~20 wt%, and a much smaller one of ~15 wt%. These values are typical of nearside lunar maria.To complement our compositional data, we present a census of craters larger than 500 m using Orbiter IV images. The result was a crater count average with frequency 5.6 x 10^(-2)km^(-2), translating into an inferred mean age of 3300 Ma for the exposed lava flows.By combining lava chemistry with age, we find a possible correlation between the ages of the most prominent flow units and their estimated titanium content, with younger basalts becoming progressively Ti-richer with time (from 2-3 to 4-5 wt% TiO2).
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2006.tb00210.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 41, Number 2 (2006)

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