A model for the evolution of opaques in mare lavasThe apparent 'reduced' state of the opaque mineral assemblages of mare basalts has led to various hypotheses on their origin through reduction by various media. A model is developed whereby the presence of trivalent titanium (Ti/3+/) and metallic iron in mare lavas at low oxygen fugacities automatically leads to the production of the observed assemblages by cooling near the mare basalt solidus. The 'reduced' assemblages may evolve isochemically at oxygen fugacities near the iron-ilmenite-ferropseudobrookite buffer by a reaction of the form Fe(2+)+2 Ti(3+) = metallic iron +2 Ti(4+).
Document ID
19780062733
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Haselton, J. D. (Utah Univ. Salt Lake City, UT, United States)
Nash, W. P. (Utah, University Salt Lake City, Utah, United States)