Rhythmical patterns of quartz-molybdenite and interpretation of its origin

Subject of the study was molybdenite aggregate (0.9 × 0.5 cm) in granite from Cu ± Mo-porphyry mineralisation (Altynai Massif, eastern part of Middle Urals). Microprobe analysis and electron microscopy identified fine alternating microlayers of molybdenite and quartz in all 0.4-5.0 mm flakes of moly...

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Main Authors: O. B. Azovskova, A. I. Grabezhev, V. V. Khiller, V. N. Smirnov, S. P. Glavatskih
Format: Article
Language:English
Published: A.N. Zavaritsky Institute of Geology and Geochemistry 2016-01-01
Series:Литосфера
Subjects:
Online Access:https://test.lithosphere.ru/jour/article/view/11
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author O. B. Azovskova
A. I. Grabezhev
V. V. Khiller
V. N. Smirnov
S. P. Glavatskih
author_facet O. B. Azovskova
A. I. Grabezhev
V. V. Khiller
V. N. Smirnov
S. P. Glavatskih
author_sort O. B. Azovskova
collection DOAJ
description Subject of the study was molybdenite aggregate (0.9 × 0.5 cm) in granite from Cu ± Mo-porphyry mineralisation (Altynai Massif, eastern part of Middle Urals). Microprobe analysis and electron microscopy identified fine alternating microlayers of molybdenite and quartz in all 0.4-5.0 mm flakes of molybdenite. Thickness of normally discontinuous layers of quartz is 0.5-3 μ, distance between layers - 8-100 μ or more. Quartz layers are aligned only with the basal cleavage of molybdenite. In some molybdenite flakes or parts of flakes quartz layers are absent or very few in number. Large flakes of molybdenite are surrounded by fine-grained aggregate of quartz, chamosite and molybdenite. Occasional grains of fluorite and galena have also been found within this aggregate. Molybdenite flakes in such areas contain no quartz layers, have random orientation, and can be seen as fragments cemented by chamosite and quartz. Molybdenite has consistently low rhenium content of 29 ppm (according to ICP-MS). It is suggested that molybdenite-quartz rhythms are likely to correspond to primary oscillatory distribution which was subsequently subjected to deformations and redistribution of silica in crushed areas.
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spelling doaj.art-a8ce9791a59a42c59a3280e73ab5b2502022-12-21T18:42:46ZengA.N. Zavaritsky Institute of Geology and GeochemistryЛитосфера1681-90042500-302X2016-01-010116316811Rhythmical patterns of quartz-molybdenite and interpretation of its originO. B. Azovskova0A. I. Grabezhev1V. V. Khiller2V. N. Smirnov3S. P. Glavatskih4Institute of Geology and Geochemistry, Urals Branch of RASInstitute of Geology and Geochemistry, Urals Branch of RASInstitute of Geology and Geochemistry, Urals Branch of RASInstitute of Geology and Geochemistry, Urals Branch of RASInstitute of Geology and Geochemistry, Urals Branch of RASSubject of the study was molybdenite aggregate (0.9 × 0.5 cm) in granite from Cu ± Mo-porphyry mineralisation (Altynai Massif, eastern part of Middle Urals). Microprobe analysis and electron microscopy identified fine alternating microlayers of molybdenite and quartz in all 0.4-5.0 mm flakes of molybdenite. Thickness of normally discontinuous layers of quartz is 0.5-3 μ, distance between layers - 8-100 μ or more. Quartz layers are aligned only with the basal cleavage of molybdenite. In some molybdenite flakes or parts of flakes quartz layers are absent or very few in number. Large flakes of molybdenite are surrounded by fine-grained aggregate of quartz, chamosite and molybdenite. Occasional grains of fluorite and galena have also been found within this aggregate. Molybdenite flakes in such areas contain no quartz layers, have random orientation, and can be seen as fragments cemented by chamosite and quartz. Molybdenite has consistently low rhenium content of 29 ppm (according to ICP-MS). It is suggested that molybdenite-quartz rhythms are likely to correspond to primary oscillatory distribution which was subsequently subjected to deformations and redistribution of silica in crushed areas.https://test.lithosphere.ru/jour/article/view/11молибденитCu-Mo-порфировые системымикрозональностьмикрозондовый анализУралmolybdeniteporphyry-copper systemsmicrozonationmicroprobe analysesUrals
spellingShingle O. B. Azovskova
A. I. Grabezhev
V. V. Khiller
V. N. Smirnov
S. P. Glavatskih
Rhythmical patterns of quartz-molybdenite and interpretation of its origin
Литосфера
молибденит
Cu-Mo-порфировые системы
микрозональность
микрозондовый анализ
Урал
molybdenite
porphyry-copper systems
microzonation
microprobe analyses
Urals
title Rhythmical patterns of quartz-molybdenite and interpretation of its origin
title_full Rhythmical patterns of quartz-molybdenite and interpretation of its origin
title_fullStr Rhythmical patterns of quartz-molybdenite and interpretation of its origin
title_full_unstemmed Rhythmical patterns of quartz-molybdenite and interpretation of its origin
title_short Rhythmical patterns of quartz-molybdenite and interpretation of its origin
title_sort rhythmical patterns of quartz molybdenite and interpretation of its origin
topic молибденит
Cu-Mo-порфировые системы
микрозональность
микрозондовый анализ
Урал
molybdenite
porphyry-copper systems
microzonation
microprobe analyses
Urals
url https://test.lithosphere.ru/jour/article/view/11
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AT aigrabezhev rhythmicalpatternsofquartzmolybdeniteandinterpretationofitsorigin
AT vvkhiller rhythmicalpatternsofquartzmolybdeniteandinterpretationofitsorigin
AT vnsmirnov rhythmicalpatternsofquartzmolybdeniteandinterpretationofitsorigin
AT spglavatskih rhythmicalpatternsofquartzmolybdeniteandinterpretationofitsorigin