ArticlesSpecial Mineral Studies

High Crystallization Temperatures Indicated for Igneous Rocks from Tranquillity Base

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Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 652-654
DOI: 10.1126/science.167.3918.652


Complex intergrowths of troilite (FeS) and iron in the igneous rocks from Tranquillity Base contain 8.4 percent native iron by volume. The intergrowths were derived from an initially homogeneous sulfide liquid that separated immiscibly from the magma at 1140°C or above. Textures show that the sulfide liquid formed late in the crystallization and cooling history of the igneous rocks and after the major ilmenite and pyroxene had formed.

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