Mechanically- v. diffusion-controlled metamorphic microstructure: a symplectite example from Rhodope Metamorphic Complex (Greece)
- Publikationstyp:
- Zeitschriftenaufsatz
- Metadaten:
-
- Autoren
- E Moulas
- L Tajcmanova
- JC Vrijmoed
- Y Podladchikov
- Autoren-URL
- https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000360767700006&DestLinkType=FullRecord&DestApp=WOS_CPL
- DOI
- 10.1111/jmg.12141
- eISSN
- 1525-1314
- Externe Identifier
- Clarivate Analytics Document Solution ID: CQ7FF
- ISSN
- 0263-4929
- Ausgabe der Veröffentlichung
- 8
- Zeitschrift
- JOURNAL OF METAMORPHIC GEOLOGY
- Schlüsselwörter
- chemical diffusion
- chemical zoning
- grain boundary diffusion
- pressure variations
- unconventional barometry
- Paginierung
- 849 - 858
- Datum der Veröffentlichung
- 2015
- Status
- Published
- Titel
- Mechanically- <i>v</i>. diffusion-controlled metamorphic microstructure: a symplectite example from Rhodope Metamorphic Complex (Greece)
- Sub types
- Article
- Ausgabe der Zeitschrift
- 33
Datenquelle: Web of Science (Lite)
- Andere Metadatenquellen:
-
- Abstract
- <jats:title>Abstract</jats:title><jats:p>Gradients in chemical potential are the driving force for chemical diffusion and their spatial distribution is thus essential to investigate equilibrium in metamorphic rocks. At high temperatures (>650 °C), where chemical diffusion is relatively fast, the development and preservation of compositional zoning in minerals can be controlled by mechanically maintained pressure variations. Therefore, the dependence of chemical potentials on pressure plays an important role in correct interpretations of rock microstructures. Distinguishing between pressure‐controlled chemical zoning and zoning reflecting chemical diffusion is a challenge. To tackle this challenge, we investigate a symplectitic microstructure around kyanite in an amphibolitized eclogite from the Rhodope Metamorphic Complex (Greece). The sample recrystallized at high temperatures (~720 °C) and low pressures (<1 <jats:styled-content style="fixed-case">GP</jats:styled-content>a) during which kyanite was replaced by fine‐grained symplectites of sapphirine, spinel, plagioclase and corundum. The plagioclase rim around kyanite shows a cusp‐shaped chemical zoning of calcium along the grain boundaries. The results from combined phase equilibria and diffusion modelling show that the cusp‐like shapes were developed by fast grain boundary diffusion at constant pressure after the relaxation of grain‐scale pressure variations across the plagioclase rim. The results illustrate an example where petrographic observations help to distinguish between mechanically‐ and diffusion‐controlled chemical zoning.</jats:p>
- Autoren
- E Moulas
- L Tajčmanová
- JC Vrijmoed
- Y Podladchikov
- DOI
- 10.1111/jmg.12141
- eISSN
- 1525-1314
- ISSN
- 0263-4929
- Ausgabe der Veröffentlichung
- 8
- Zeitschrift
- Journal of Metamorphic Geology
- Sprache
- en
- Online publication date
- 2015
- Paginierung
- 849 - 858
- Datum der Veröffentlichung
- 2015
- Status
- Published
- Herausgeber
- Wiley
- Herausgeber URL
- http://dx.doi.org/10.1111/jmg.12141
- Datum der Datenerfassung
- 2023
- Titel
- Mechanically‐ <i>v</i>. diffusion‐controlled metamorphic microstructure: a symplectite example from Rhodope Metamorphic Complex (Greece)
- Ausgabe der Zeitschrift
- 33
Datenquelle: Crossref
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