<abstract xmlns="http://www.w3.org/1999/xhtml">Chevkinite-group minerals are widespread in a very wide range of igneous and metamorphic parageneses, forming important components of accessory mineral assemblages. Their presence in a rock may be difficult to establish by standard optical techniques, which has contributed to their importance being underestimated; a combination of SEM and EMPA is recommended here. Currently, there are eleven IMAapproved members of the group but undoubtedly several more will be described in the near future. There is considerable compositional variation in the group, which can be expressed as: REE + M2+C + M3+C = Ca2+ A + Sr + Ti4+C + Zr4+C where A and C are structural sites. Chevkinite-group minerals strongly fractionate geochemically coherent pairs, such as LREE-HREE, Nb-Ta, Zr-Hf and Th-U, and thus play a critical role in geochemical modelling.</abstract>

Chevkinite-group minerals are widespread in a very wide range of igneous and metamorphic parageneses, forming important components of accessory mineral assemblages. Their presence in a rock may be difficult to establish by standard optical techniques, which has contributed to their importance being underestimated; a combination of SEM and EMPA is recommended here. Currently, there are eleven IMAapproved members of the group but undoubtedly several more will be described in the near future. There is considerable compositional variation in the group, which can be expressed as: REE + M2+C + M3+C = Ca2+ A + Sr + Ti4+C + Zr4+C where A and C are structural sites. Chevkinite-group minerals strongly fractionate geochemically coherent pairs, such as LREE-HREE, Nb-Ta, Zr-Hf and Th-U, and thus play a critical role in geochemical modelling.

The chevkinite group: underestimated accessory phases from a wide range of parageneses

IGMiP Faculty of Geology, University of Warsaw, ul. Żwirki i Wigury 93, 02-089 Warszawa, Poland

Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom

Mineralogia

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Chevkinite-group minerals are widespread in a very wide range of igneous and metamorphic parageneses, forming important components of accessory mineral...

The chevkinite group: underestimated accessory phases from a wide range of parageneses

Online veröffentlicht: 31. Juli 2014

Seitenbereich: 99 - 114

Eingereicht: 20. Apr. 2011

Akzeptiert: 08. Aug. 2013

DOI: https://doi.org/10.2478/mipo-2013-0006

Schlüsselwörter
chevkinite group minerals, chevkinite, perrierite, chemical composition, classification

© by Bogusław Bagiński

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The chevkinite group: underestimated accessory phases from a wide range of parageneses

Online veröffentlicht: 31. Juli 2014

Seitenbereich: 99 - 114

Eingereicht: 20. Apr. 2011

Akzeptiert: 08. Aug. 2013

DOI: https://doi.org/10.2478/mipo-2013-0006

Schlüsselwörterchevkinite group minerals, chevkinite, perrierite, chemical composition, classification

© by Bogusław Bagiński

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Schlüsselwörter
chevkinite group minerals, chevkinite, perrierite, chemical composition, classification