Mineralogy and genesis of sapphire in corundum-bearing xenoliths from the Miocene andesites in the Záhradné, Hubošovce and Vechec quarries in the Slanské vrchy Mountains (Slovakia)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F24%3A10136548" target="_blank" >RIV/00023272:_____/24:10136548 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/24:00138787

Result on the web

<a href="https://geologicacarpathica.com/browse/archive/?journal_article_no=32999" target="_blank" >https://geologicacarpathica.com/browse/archive/?journal_article_no=32999</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.31577/GeolCarp.2024.06" target="_blank" >10.31577/GeolCarp.2024.06</a>

Result language

angličtina

Original language name

Mineralogy and genesis of sapphire in corundum-bearing xenoliths from the Miocene andesites in the Záhradné, Hubošovce and Vechec quarries in the Slanské vrchy Mountains (Slovakia)

Original language description

Sapphires crystals were identified in the corundum-bearing xenoliths in Miocene (Upper to Middle Sarmathian) andesites of the Slansk &amp; eacute; vrchy Mountains, eastern Slovakia at the Záhradné, Hubošovce and Vechec localities. The sapphire crystals occur in (1) micaceous xenoliths, which are built mostly of dark mica from annite-phlogopite series (biotite), K-feldspars, plagioclase with abundant inclusions of hercynite, ilmenite and Ti-rich magnetite, locally with pyroxenes of enstatite-ferosilite series at the localities Záhradné; and Hubošovce. Less abundant are sapphires occurring in cordieritic xenoliths (2), dominantly consisting of cordierite, plagioclase and sillimanite with minor hercynite and ilmenite inclusions discovered in the Vechec quarry. Sapphires are dark blue to light blue with vitreous to diamond lustre and no visible pleochroic colour change forming mostly pseudohexagonal tabular, locally more complex euhedral to subhedral crystals up to 2.0 mm in size with triangular-shaped patterns on crystal faces. Raman spectroscopy showed characteristic corundum peaks at 419 cm-1 A1g mode and 384 cm-1 Eg mode with other peaks assigned to Al2O3 crystal vibrations. Chemical composition (EPMA, LA-ICP-MS) shows typical content of 98.12-99.60 wt. % Al2O3 with increased concentrations of Fe, Ti, Cr, V, Mg and Ga, locally also Na, Ca, K, B and Li. Genesis of corundum-bearing xenoliths interpreted from paragenetic observations and geochemical data shows clear metamorphic trend. Formation of sapphires was caused by incorporation of Al-rich precursor metasediments depleted in silica into the magmatic reservoir, which caused thermal overprint of the precursor mineral assemblage and led to the formation of high temperature mineral association suitable for corundum crystallization.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geologica Carpathica

ISSN

1335-0552

e-ISSN

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Volume of the periodical

75

Issue of the periodical within the volume

2

Country of publishing house

SK - SLOVAKIA

Number of pages

15

Pages from-to

117-131

UT code for WoS article

001268151600003

EID of the result in the Scopus database

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