The moon

, Volume 17, Issue 3, pp 263–287 | Cite as

Basalts from Mare Crisium

  • Graham Ryder
  • Harry Y. McsweenJr.
  • Ursula B. Marvin
Article

Abstract

The stratified core sample returned from Mare Crisium by the Luna 24 unmanned space probe is composed primarily of a new variety of subophitic to ophitic basalt with very low contents of TiO2 and MgO. This consists of clinopyroxene, calcic plagioclase, olivine, and minor amounts of silica, chromite, ulvöspinel, ilmenite, troilite, apatite, and Fe-metal. Granular metabasalts have the same bulk composition, but mineral phases exhibit less compositional variation. Fine-grained impact melts have similar compositions and are apparently derived from these basalts. We conclude that the basalts, which are chemically distinct from the very-low-titanium basalts found elsewhere on the Moon, represent the local surface flows of Mare Crisium.

Sparse fragments of an olivine vitrophyre that is low in TiO2 but high in MgO and approaches the composition of the Apollo 15 green glasses may be derived from patches of dark mantling materials 20 km from the landing site.

Keywords

TiO2 Olivine Apatite Ilmenite Chromite 

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Copyright information

© D. Reidel Publishing Company, Dordrecht-Holland 1977

Authors and Affiliations

  • Graham Ryder
    • 1
  • Harry Y. McsweenJr.
    • 1
  • Ursula B. Marvin
    • 1
  1. 1.Center for AstrophysicsCambridgeUSA

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