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Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts

Fernanda Gervasoni, Stephan Klemme, Arno Rohrbach, Tobias Gruetzner and Jasper Berndt
Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts
American Mineralogist (April 2017) 102 (4): 860-866

Abstract

Carbonatites are rare igneous carbonate-rich rocks. Most carbonatites contain a large number of accessory oxide, sulfide, and silicate minerals. Baddeleyite (ZrO (sub 2) ) and zircon (ZrSiO (sub 4) ) are common accessory minerals in carbonatites and because these minerals host high concentrations of U and Th, they are often used to determine the ages of formation of the carbonatite. In an experimental study, we constrain the stability fields of baddeleyite and zircon in Ca-rich carbonate melts with different silica concentrations. Our results show that SiO (sub 2) -free and low silica carbonate melts crystallize baddeleyite, whereas zircon only crystallizes in melts with higher concentration of SiO (sub 2) We also find that the zirconsilicate baghdadite (Ca (sub 3) ZrSi (sub 2) O (sub 9) ) crystallizes in intermediate compositions. Our experiments indicate that zircon may not be a primary mineral in a low-silica carbonatite melt and care must be taken when interpreting zircon ages from low-silica carbonatite rocks.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 102
Serial Issue: 4
Title: Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts
Affiliation: Westfaelische Wilhelms Universitaet, Institut fuer Mineralogie, Munster, Germany
Pages: 860-866
Published: 201704
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 46
Accession Number: 2017-041518
Categories: General mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201723
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