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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian

IMPACT FACTOR 2017: 2.645

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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Volume 92, Issue 10


Carbon is not required during crystallization to produce ferrobasalts/ferrodiorites (FTP rocks)

Matthew L. Whitaker / Donald H. Lindsley / Jan M. Kubicek Whitaker / Hanna Nekvasil
Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2007.2643


Experiments were conducted to determine whether the presence of graphite is required to produce the Fe-Ti-P-enrichment, silica-depletion trend seen in ferrobasalts and ferrodiorites/jotunites. A nominally anhydrous Snake River Plain olivine tholeiite was crystallized at 9.3 kbar in Fe-Pt capsules; the composition of the Fe-Pt alloy was empirically chosen such that the charge neither lost nor gained iron. The results of these experiments and those of previous experiments conducted in graphite are strikingly similar: in both cases the residual liquids were depleted in silica and enriched in Fe, Ti, and P. We conclude that the presence of carbon is not essential for producing this distinctive trend.

Keywords: Experimental petrology; tholeiite; crystal-liquid differentiation; phase equilibria

About the article

Received: 2007-03-19

Accepted: 2007-05-21

Published Online: 2015-04-01

Published in Print: 2007-10-01

Citation Information: American Mineralogist, Volume 92, Issue 10, Pages 1750–1755, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2007.2643.

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