Yangzhumingite and phlogopite from the Kvaløya lamproite (North Norway): Structure, composition and origin
This study reports a petrographic and crystal chemical analysis of three types of micas (yangzhumingite, light brown phlogopite and dark brown phlogopite) found in a lamproitic dyke at the Kvaløya Island (North Norway). The study was carried out integrating different analytical techniques: electron...
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Online Access: | http://hdl.handle.net/11586/124029 https://doi.org/10.1016/j.lithos.2014.09.020 |
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ftunivbari:oai:ricerca.uniba.it:11586/124029 2023-06-11T04:13:46+02:00 Yangzhumingite and phlogopite from the Kvaløya lamproite (North Norway): Structure, composition and origin SCHINGARO, Emanuela LACALAMITA, MARIA MESTO, ERNESTO Kullerud K Scordari F Zozulya D Erambert M Ravna E. J. K. Schingaro, Emanuela Kullerud, K Lacalamita, Maria Mesto, Ernesto Scordari, F Zozulya, D Erambert, M Ravna, E. J. K. 2014 http://hdl.handle.net/11586/124029 https://doi.org/10.1016/j.lithos.2014.09.020 unknown info:eu-repo/semantics/altIdentifier/wos/WOS:000347507600001 volume:210 firstpage:1 lastpage:13 numberofpages:13 journal:LITHOS http://hdl.handle.net/11586/124029 doi:10.1016/j.lithos.2014.09.020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84908222424 info:eu-repo/semantics/article 2014 ftunivbari https://doi.org/10.1016/j.lithos.2014.09.020 2023-05-31T16:47:14Z This study reports a petrographic and crystal chemical analysis of three types of micas (yangzhumingite, light brown phlogopite and dark brown phlogopite) found in a lamproitic dyke at the Kvaløya Island (North Norway). The study was carried out integrating different analytical techniques: electron microprobe, single crystal X-ray diffraction, inductively coupled plasma mass spectrometry, Mössbauer and micro-Fourier Transform infrared spectroscopy. Kvaløya yangzhumingite (second occurrence in nature) was characterized for the first time in detail via single crystal X-ray diffraction. The different mica types are distinguishable on the basis of the VIFe and Mg versus Si content. Yangzhumingite composition is intermediate between those of KMg2.75(Si3.5Al0.5)O10F2 and KMg2.50Si4O10F2 synthetic compounds reported in the literature. Light and possibly dark brown phlogopite is a Mg-rich fluorotetraferriphlogopite, the latter having a greater Fe content. The infrared spectra of yangzhumingite and the light brown phlogopite show the occurrence of OH- absorption bands respectively at: ~ 3586 cm- 1 which correlates well with the measured F content; 3707 cm- 1 and 3686 cm- 1 assigned mainly to 3Mg2 +-K+-OH- (phlogopitic) environment. Structural analyses, performed only on yangzhumingite and light brown phlogopite show that both samples are 1M polytypes with the expected space group C2/m. Crystal chemical details are compatible with the following major substitution mechanisms: 2XIIK+ + VI[] ↔ 2XII[] + VIR2 + (where R2 + = Mg, Fe), OH- ↔ F- for yangzhumingite and 2VIR2 + ↔ VITi4 + + VI[] (Ti-vacancy), OH- ↔ F- for light brown phlogopite. All three types of micas formed at relatively constant low pressure, but over a large temperature range in equilibrium with a grain boundary fluid that underwent significant changes in composition during reaction progress. Light brown phlogopite cores and dark brown phlogopite rims formed during crystallization from the lamproitic magma, while yangzhumingite formed as a result of reactions ... Article in Journal/Newspaper Kvaløya North Norway Università degli Studi di Bari Aldo Moro: CINECA IRIS Norway Lithos 210-211 1 13 |
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Università degli Studi di Bari Aldo Moro: CINECA IRIS |
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ftunivbari |
language |
unknown |
description |
This study reports a petrographic and crystal chemical analysis of three types of micas (yangzhumingite, light brown phlogopite and dark brown phlogopite) found in a lamproitic dyke at the Kvaløya Island (North Norway). The study was carried out integrating different analytical techniques: electron microprobe, single crystal X-ray diffraction, inductively coupled plasma mass spectrometry, Mössbauer and micro-Fourier Transform infrared spectroscopy. Kvaløya yangzhumingite (second occurrence in nature) was characterized for the first time in detail via single crystal X-ray diffraction. The different mica types are distinguishable on the basis of the VIFe and Mg versus Si content. Yangzhumingite composition is intermediate between those of KMg2.75(Si3.5Al0.5)O10F2 and KMg2.50Si4O10F2 synthetic compounds reported in the literature. Light and possibly dark brown phlogopite is a Mg-rich fluorotetraferriphlogopite, the latter having a greater Fe content. The infrared spectra of yangzhumingite and the light brown phlogopite show the occurrence of OH- absorption bands respectively at: ~ 3586 cm- 1 which correlates well with the measured F content; 3707 cm- 1 and 3686 cm- 1 assigned mainly to 3Mg2 +-K+-OH- (phlogopitic) environment. Structural analyses, performed only on yangzhumingite and light brown phlogopite show that both samples are 1M polytypes with the expected space group C2/m. Crystal chemical details are compatible with the following major substitution mechanisms: 2XIIK+ + VI[] ↔ 2XII[] + VIR2 + (where R2 + = Mg, Fe), OH- ↔ F- for yangzhumingite and 2VIR2 + ↔ VITi4 + + VI[] (Ti-vacancy), OH- ↔ F- for light brown phlogopite. All three types of micas formed at relatively constant low pressure, but over a large temperature range in equilibrium with a grain boundary fluid that underwent significant changes in composition during reaction progress. Light brown phlogopite cores and dark brown phlogopite rims formed during crystallization from the lamproitic magma, while yangzhumingite formed as a result of reactions ... |
author2 |
Schingaro, Emanuela Kullerud, K Lacalamita, Maria Mesto, Ernesto Scordari, F Zozulya, D Erambert, M Ravna, E. J. K. |
format |
Article in Journal/Newspaper |
author |
SCHINGARO, Emanuela LACALAMITA, MARIA MESTO, ERNESTO Kullerud K Scordari F Zozulya D Erambert M Ravna E. J. K. |
spellingShingle |
SCHINGARO, Emanuela LACALAMITA, MARIA MESTO, ERNESTO Kullerud K Scordari F Zozulya D Erambert M Ravna E. J. K. Yangzhumingite and phlogopite from the Kvaløya lamproite (North Norway): Structure, composition and origin |
author_facet |
SCHINGARO, Emanuela LACALAMITA, MARIA MESTO, ERNESTO Kullerud K Scordari F Zozulya D Erambert M Ravna E. J. K. |
author_sort |
SCHINGARO, Emanuela |
title |
Yangzhumingite and phlogopite from the Kvaløya lamproite (North Norway): Structure, composition and origin |
title_short |
Yangzhumingite and phlogopite from the Kvaløya lamproite (North Norway): Structure, composition and origin |
title_full |
Yangzhumingite and phlogopite from the Kvaløya lamproite (North Norway): Structure, composition and origin |
title_fullStr |
Yangzhumingite and phlogopite from the Kvaløya lamproite (North Norway): Structure, composition and origin |
title_full_unstemmed |
Yangzhumingite and phlogopite from the Kvaløya lamproite (North Norway): Structure, composition and origin |
title_sort |
yangzhumingite and phlogopite from the kvaløya lamproite (north norway): structure, composition and origin |
publishDate |
2014 |
url |
http://hdl.handle.net/11586/124029 https://doi.org/10.1016/j.lithos.2014.09.020 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Kvaløya North Norway |
genre_facet |
Kvaløya North Norway |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000347507600001 volume:210 firstpage:1 lastpage:13 numberofpages:13 journal:LITHOS http://hdl.handle.net/11586/124029 doi:10.1016/j.lithos.2014.09.020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84908222424 |
op_doi |
https://doi.org/10.1016/j.lithos.2014.09.020 |
container_title |
Lithos |
container_volume |
210-211 |
container_start_page |
1 |
op_container_end_page |
13 |
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1768391102242488320 |