Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..383f&link_type=abstract
Lunar and Planetary Science, volume 27, page 383
Computer Science
2
Basalt: Mare, Clementine, Galileo, Lava Flows, Mare Imbrium
Scientific paper
We are investigating regional variations in mare basalts to determine whether there are changes in the magma sources over time or evolution of lava during the course of emplacement. Mare Imbrium, with its multiple high-volume Eratosthenian flows, is a prime location for examining magma compositions in three spatial and temporal contexts: along lengthy flows, between major eruptive events (represented by at least three phases of lava flows), and between younger (Eratosthenian) and older (Late Imbrium) mare filling lavas. We have used Clementine and Galileo spectral reflectance data, calibrated to determine FeO and TiO2 contents to high accuracy. These data show significant differences between older and younger Imbrium mare, which suggest distinctly different geochemical provinces: one like Apollo 15 basalts and one like yellow glass 15010,3189 and richer in TiO2 and Th. The flows from three eruptive events, attributed to the same source but spread over 0.5 Gy, show minor variations in composition, suggesting modest evolution through time of the magma source due to the repeated high volume melting events. Two long (400-600 km) Eratosthenian flows show no consistent variation downstream, indicating little fractional crystallization took place during flow emplacement.
Blewett Dave T.
Friedman R. C.
Jeffrey Taylor G.
Lucey Paul G.
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