Chemical Composition and Petrogenetic Implications of Apatite in the Khibiny Apatite-Nepheline Deposits (Kola Peninsula)
Khibiny, one of the largest of the world’s peralkaline intrusions, hosts gigantic apatite deposits. Apatite is represented by F-apatite and it contains exceptionally high concentration of SrO. (4.5 wt % on average) and increased amounts of rare earth elements (REEs; up to 8891 ppm). Such enrichment...
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ftmdpi:oai:mdpi.com:/2075-163X/8/11/532/ 2023-08-20T04:07:48+02:00 Chemical Composition and Petrogenetic Implications of Apatite in the Khibiny Apatite-Nepheline Deposits (Kola Peninsula) Lia Kogarko agris 2018-11-16 application/pdf https://doi.org/10.3390/min8110532 EN eng Multidisciplinary Digital Publishing Institute Crystallography and Physical Chemistry of Minerals & Nanominerals https://dx.doi.org/10.3390/min8110532 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 8; Issue 11; Pages: 532 apatite Khibiny apatite-nepheline deposit phase diagram apatite-nepheline-diopside Text 2018 ftmdpi https://doi.org/10.3390/min8110532 2023-07-31T21:50:49Z Khibiny, one of the largest of the world’s peralkaline intrusions, hosts gigantic apatite deposits. Apatite is represented by F-apatite and it contains exceptionally high concentration of SrO. (4.5 wt % on average) and increased amounts of rare earth elements (REEs; up to 8891 ppm). Such enrichment of apatite ores in REEs defined Khibiny deposit as world-class deposit with resources reaching several millions tons REE2O3. Apatite from the Khibina alkaline complex is characterized by the significant enrichment in light REEs relative to the heavy REEs (with average Ce/Yb ratio of 682) and the absence of a negative Eu anomaly. The obtained geochemical signature of apatite suggests a residual character of the Khibiny alkaline magma and it indicates that the differentiation of the primary olivine-melanephelinitic magma developed without fractionation of plagioclase which is the main mineral-concentrator of Sr and Eu in basaltic magmatic systems. The compositional evolution of the Khibiny apatite in the vertical section of the intrusion reflects primary fractionation processes in the alkaline magma that differentiated in situ. The main mechanism for the formation of the apatite-nepheline deposits was the gravitational settling of large nepheline crystals in the lower part of the magma chamber, while very small apatite crystals were suspended in a convective magma, and, together with the melt, were concentrated in its upper part of the magmatic chamber. Text kola peninsula MDPI Open Access Publishing Kola Peninsula Khibiny ENVELOPE(33.210,33.210,67.679,67.679) Minerals 8 11 532 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
apatite Khibiny apatite-nepheline deposit phase diagram apatite-nepheline-diopside |
spellingShingle |
apatite Khibiny apatite-nepheline deposit phase diagram apatite-nepheline-diopside Lia Kogarko Chemical Composition and Petrogenetic Implications of Apatite in the Khibiny Apatite-Nepheline Deposits (Kola Peninsula) |
topic_facet |
apatite Khibiny apatite-nepheline deposit phase diagram apatite-nepheline-diopside |
description |
Khibiny, one of the largest of the world’s peralkaline intrusions, hosts gigantic apatite deposits. Apatite is represented by F-apatite and it contains exceptionally high concentration of SrO. (4.5 wt % on average) and increased amounts of rare earth elements (REEs; up to 8891 ppm). Such enrichment of apatite ores in REEs defined Khibiny deposit as world-class deposit with resources reaching several millions tons REE2O3. Apatite from the Khibina alkaline complex is characterized by the significant enrichment in light REEs relative to the heavy REEs (with average Ce/Yb ratio of 682) and the absence of a negative Eu anomaly. The obtained geochemical signature of apatite suggests a residual character of the Khibiny alkaline magma and it indicates that the differentiation of the primary olivine-melanephelinitic magma developed without fractionation of plagioclase which is the main mineral-concentrator of Sr and Eu in basaltic magmatic systems. The compositional evolution of the Khibiny apatite in the vertical section of the intrusion reflects primary fractionation processes in the alkaline magma that differentiated in situ. The main mechanism for the formation of the apatite-nepheline deposits was the gravitational settling of large nepheline crystals in the lower part of the magma chamber, while very small apatite crystals were suspended in a convective magma, and, together with the melt, were concentrated in its upper part of the magmatic chamber. |
format |
Text |
author |
Lia Kogarko |
author_facet |
Lia Kogarko |
author_sort |
Lia Kogarko |
title |
Chemical Composition and Petrogenetic Implications of Apatite in the Khibiny Apatite-Nepheline Deposits (Kola Peninsula) |
title_short |
Chemical Composition and Petrogenetic Implications of Apatite in the Khibiny Apatite-Nepheline Deposits (Kola Peninsula) |
title_full |
Chemical Composition and Petrogenetic Implications of Apatite in the Khibiny Apatite-Nepheline Deposits (Kola Peninsula) |
title_fullStr |
Chemical Composition and Petrogenetic Implications of Apatite in the Khibiny Apatite-Nepheline Deposits (Kola Peninsula) |
title_full_unstemmed |
Chemical Composition and Petrogenetic Implications of Apatite in the Khibiny Apatite-Nepheline Deposits (Kola Peninsula) |
title_sort |
chemical composition and petrogenetic implications of apatite in the khibiny apatite-nepheline deposits (kola peninsula) |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2018 |
url |
https://doi.org/10.3390/min8110532 |
op_coverage |
agris |
long_lat |
ENVELOPE(33.210,33.210,67.679,67.679) |
geographic |
Kola Peninsula Khibiny |
geographic_facet |
Kola Peninsula Khibiny |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_source |
Minerals; Volume 8; Issue 11; Pages: 532 |
op_relation |
Crystallography and Physical Chemistry of Minerals & Nanominerals https://dx.doi.org/10.3390/min8110532 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min8110532 |
container_title |
Minerals |
container_volume |
8 |
container_issue |
11 |
container_start_page |
532 |
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1774719683334766592 |