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American Mineralogist

Journal of Earth and Planetary Materials

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


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

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

Online
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1945-3027
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Volume 100, Issue 5-6

Issues

Letter. Experimental confirmation of high-temperature silicate liquid immiscibility in multicomponent ferrobasaltic systems

Tong Hou
  • Corresponding author
  • State Key Laboratory of Geological Process and Mineral Resourses, China University of Geosciences, Beijing, 100083, China
  • GFZ German Research Center for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany
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  • Other articles by this author:
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/ Ilya V. Veksler
  • GFZ German Research Center for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany
  • Department of Mineralogy, Technical University Berlin, Ackerstrasse 71-76, Berlin 13555, Germany
  • Perm State University, Geological Department, Bukireva 15, 614990 Perm, Russia
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Published Online: 2015-05-12 | DOI: https://doi.org/10.2138/am-2015-5285

Abstract

Here we report the results of an experimental study aimed at testing the existence of stable, superliquidus immiscibility between silica- and Fe-rich multicomponent melts at temperatures above 1100 °C. Four pairs of the potentially immiscible compositions were tested in a 1-atm gas-mixing furnace (Ar/H2-CO2 gas mixture) at 1150 and 1200 °C and at the oxygen fugacity corresponding to that of the QFM buffer. Pre-synthesized pairs of the silica-rich and Fe-rich starting compositions were loaded in Pt wire loops, fused separately at 1300 °C, then brought in contact and kept at constant experimental temperature for more than 24 h. Three pairs of compositions out of four used in this study did not mix. Some temperature-dependent chemical re-equilibration was observed in the Fe-rich liquid phase but, in the cases of immiscibility, the two liquids remained compositionally distinct and showed sharp compositional gradients at contacts. One pair of liquids crystallized some tridymite, whereas the other compositions were clearly above the liquidus. Overall, the results of the experiments are in good agreement with the earlier centrifuge study and confirm the existence of stable, super-liquidus immiscibility in some Fe-rich basaltic-andesitic compositions at temperatures up to 1200 °C.

Keywords: Experimental petrology; silicate liquid immiscibility; ferrobasaltic; multicomponent silicate melts

About the article

Received: 2014-12-16

Accepted: 2015-01-13

Published Online: 2015-05-12

Published in Print: 2015-05-01


Citation Information: American Mineralogist, Volume 100, Issue 5-6, Pages 1304–1307, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2015-5285.

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© 2015 by Walter de Gruyter Berlin/Boston.

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