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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Putirka, Keith / Swainson, Ian

12 Issues per year

IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

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Volume 92, Issue 7


Magmatic paragonite in trondhjemites from the Sierra del Convento mélange, Cuba

Antonio García-Casco†
Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2007.2598


In the Sierra del Convento mélange peraluminous trondhjemitic-tonalitic rocks, formed by partial melting of subducted oceanic crust at ca. 15 kbar, 700 °C, contain millimeter-sized crystals of paragonite that appear to be of magmatic origin. These crystals are replaced by plagioclase and quartz along the rims. Chemically relict paragonite cores have high K contents (up to 0.35 apfu), whereas K is low at the rims (down to ca. 0.10 apfu). Calcium is relatively high in the cores and rims ( apfu). The relict core compositions contrast significantly with small matrix paragonite crystals, which formed during subsequent subsolidus retrogression of relictic magmatic plagioclase at high pressure/low temperature (ca. 400 °C, 8 kbar). Textural relations, mineral composition, and calculations of phase relationships in the system NCASH strongly suggest that primary paragonite formed by crystallization of a silicate melt. This appears to be the first reported occurrence of magmatic paragonite.

Keywords: Magmatic paragonite; trondhjemite; mélange; subduction

About the article

Received: 2007-02-05

Accepted: 2007-04-20

Published Online: 2015-04-01

Published in Print: 2007-07-01

Citation Information: American Mineralogist, Volume 92, Issue 7, Pages 1232–1237, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2007.2598.

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© 2015 by Walter de Gruyter Berlin/Boston.Get Permission

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