The Canadian Mineralogist

The Kovdor phlogopite deposit, one of the largest on Earth, occurs in the northwestern part of the Kovdor carbonatite-bearing alkaline-ultrabasic complex, Kola Peninsula, Russia. The Main phlogopite lode is situated in the central part of a semicircular zone of phlogopite-rich rocks; its morphology...

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Main Author: Natal’ya I. Krasnova
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.6197
http://rruff.info/doclib/cm/vol39/CM39_33.pdf
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spelling ftciteseerx:oai:CiteSeerX.psu:10.1.1.495.6197 2023-05-15T17:04:55+02:00 The Canadian Mineralogist Natal’ya I. Krasnova The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.6197 http://rruff.info/doclib/cm/vol39/CM39_33.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.6197 http://rruff.info/doclib/cm/vol39/CM39_33.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://rruff.info/doclib/cm/vol39/CM39_33.pdf phlogopite alkaline rocks carbonatite alkali-ultrabasic pegmatite Kovdor complex Kola Peninsula Russia. SOMMAIRE text ftciteseerx 2016-01-08T08:45:23Z The Kovdor phlogopite deposit, one of the largest on Earth, occurs in the northwestern part of the Kovdor carbonatite-bearing alkaline-ultrabasic complex, Kola Peninsula, Russia. The Main phlogopite lode is situated in the central part of a semicircular zone of phlogopite-rich rocks; its morphology is similar to some bodies of granitic pegmatites, hosted in granites, and has a zonal structure. The rocks of the marginal part are monomineralic and consist of giant crystals (up to 2 m across) of diopside, whereas near the center are zones of forsterite–phlogopite, forsterite and apatite rocks. A microtextural study of the phlogopite-bearing bodies shows a regular pattern of spatial arrangement of the main minerals. All grew from the contacts of individual vein-like bodies toward the center. The chemical composition of the main rock-forming minerals (forsterite, phlogopite, diopside) is char-acterized by lower contents of Ti and Fe compared to the compositions of those minerals in olivinites, but are relatively enriched compared to the same minerals in phoscorites and carbonatites. Gas extracted from phlogopite and apatite shows that hydrogen is an important component in the inclusions. Thermometric data suggest that the formation of the main minerals in the deposit took place at a high temperature, in the range 800–900°C, whereas hydrostatic pressure in the system barely exceeded 2000 bars. On the basis of its shape, structure, features of mineral growth and crystallization sequence, the Main phlogopite lode may be regarded as a peculiar alkali-ultrabasic pegmatite. Text kola peninsula Unknown Kola Peninsula Kovdor ENVELOPE(30.620,30.620,67.534,67.534)
institution Open Polar
collection Unknown
op_collection_id ftciteseerx
language English
topic phlogopite
alkaline rocks
carbonatite
alkali-ultrabasic pegmatite
Kovdor complex
Kola Peninsula
Russia. SOMMAIRE
spellingShingle phlogopite
alkaline rocks
carbonatite
alkali-ultrabasic pegmatite
Kovdor complex
Kola Peninsula
Russia. SOMMAIRE
Natal’ya I. Krasnova
The Canadian Mineralogist
topic_facet phlogopite
alkaline rocks
carbonatite
alkali-ultrabasic pegmatite
Kovdor complex
Kola Peninsula
Russia. SOMMAIRE
description The Kovdor phlogopite deposit, one of the largest on Earth, occurs in the northwestern part of the Kovdor carbonatite-bearing alkaline-ultrabasic complex, Kola Peninsula, Russia. The Main phlogopite lode is situated in the central part of a semicircular zone of phlogopite-rich rocks; its morphology is similar to some bodies of granitic pegmatites, hosted in granites, and has a zonal structure. The rocks of the marginal part are monomineralic and consist of giant crystals (up to 2 m across) of diopside, whereas near the center are zones of forsterite–phlogopite, forsterite and apatite rocks. A microtextural study of the phlogopite-bearing bodies shows a regular pattern of spatial arrangement of the main minerals. All grew from the contacts of individual vein-like bodies toward the center. The chemical composition of the main rock-forming minerals (forsterite, phlogopite, diopside) is char-acterized by lower contents of Ti and Fe compared to the compositions of those minerals in olivinites, but are relatively enriched compared to the same minerals in phoscorites and carbonatites. Gas extracted from phlogopite and apatite shows that hydrogen is an important component in the inclusions. Thermometric data suggest that the formation of the main minerals in the deposit took place at a high temperature, in the range 800–900°C, whereas hydrostatic pressure in the system barely exceeded 2000 bars. On the basis of its shape, structure, features of mineral growth and crystallization sequence, the Main phlogopite lode may be regarded as a peculiar alkali-ultrabasic pegmatite.
author2 The Pennsylvania State University CiteSeerX Archives
format Text
author Natal’ya I. Krasnova
author_facet Natal’ya I. Krasnova
author_sort Natal’ya I. Krasnova
title The Canadian Mineralogist
title_short The Canadian Mineralogist
title_full The Canadian Mineralogist
title_fullStr The Canadian Mineralogist
title_full_unstemmed The Canadian Mineralogist
title_sort canadian mineralogist
url http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.6197
http://rruff.info/doclib/cm/vol39/CM39_33.pdf
long_lat ENVELOPE(30.620,30.620,67.534,67.534)
geographic Kola Peninsula
Kovdor
geographic_facet Kola Peninsula
Kovdor
genre kola peninsula
genre_facet kola peninsula
op_source http://rruff.info/doclib/cm/vol39/CM39_33.pdf
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http://rruff.info/doclib/cm/vol39/CM39_33.pdf
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