Rock textures and mineral zoning - A clue to understanding rare-metal granite evolution: Argemela stock, Central-Eastern Portugal

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F22%3APU147188" target="_blank" >RIV/00216305:26310/22:PU147188 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985831:_____/22:00550728

Výsledek na webu

<a href="https://reader.elsevier.com/reader/sd/pii/S0024493721006058?token=7A7D1B328D0DA828EC44D452B93F3D2A357683C6BF97051E38F547F129D93F5C48A89D7ED25270FE68505ADA9A5F6B57&originRegion=eu-west-1&originCreation=20230131165930" target="_blank" >https://reader.elsevier.com/reader/sd/pii/S0024493721006058?token=7A7D1B328D0DA828EC44D452B93F3D2A357683C6BF97051E38F547F129D93F5C48A89D7ED25270FE68505ADA9A5F6B57&originRegion=eu-west-1&originCreation=20230131165930</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.lithos.2021.106562" target="_blank" >10.1016/j.lithos.2021.106562</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Rock textures and mineral zoning - A clue to understanding rare-metal granite evolution: Argemela stock, Central-Eastern Portugal

Popis výsledku v původním jazyce

The small leucocratic strongly peraluminous P, F, Li-rich granitic system at Argemela, central-eastern Portugal, is an ideal object for the study of relations between chemical composition of granitic rocks, rock-forming minerals and rock and mineral textures, and the associated Sn, Ta and W mineralization. To define the rock and mineral composition and to formulate an evolutionary model, traditional methods of bulk-rock chemical analyses, and EMPA and LA ICP-MS analyses of rock-forming minerals were combined with the study of macrotextures, TIMA-automated mineralogical mapping of typical rock samples, and CL study of internal texture of quartz and mica crystals. The Argemela stock forms a steep cylindrical body 1 km deep, with an elliptical outcrop 250 x 180 m in size, crosscutting Cambrian schists. The stock comprises two intrusions: a geochemically moderately evolved equigranular facies (0.3 wt% F, 1.2 wt% P2O5, 1850 ppm Li, 310 ppm Sn, 24 ppm Ta, 5 ppm W) composed of albite, quartz, muscovite and minor montebrasite followed by a rather inhomogeneous, more evolved porphyritic facies (0.25-1.2 wt% F, 1.3-1.8 wt% P2O5, 1600-4900 ppm Li, 600-1000 ppm Sn, 40-85 ppm Ta, 3-6 ppm W) composed of quartz, mica and subordinate K-feldspar phenocrysts embedded in an albite-quartz-mica-amblygonite matrix. The later facies is rimmed by stockscheider at the contact with slates, and with an up to 1 m thick layered zone with unidirectional solidification textures along contact with the equigranullar facies. The NE-part of the stock is crosscut by numerous thin quartz veinlets +/- K-feldspar, phosphates and wolframite, while several aplitic dikes and thicker quartz+phosphate veins were found in two boreholes NW of the granite. Porphyritic facies, the most voluminous part of the system, contains strongly zoned phenocrysts of mica (phengite -> lepidolite) and quartz (Ti-enriched to Al, Rb-enriched) indicating crystallization in two magmatic stages, while the equigranular facies and ex

Název v anglickém jazyce

Rock textures and mineral zoning - A clue to understanding rare-metal granite evolution: Argemela stock, Central-Eastern Portugal

Popis výsledku anglicky

The small leucocratic strongly peraluminous P, F, Li-rich granitic system at Argemela, central-eastern Portugal, is an ideal object for the study of relations between chemical composition of granitic rocks, rock-forming minerals and rock and mineral textures, and the associated Sn, Ta and W mineralization. To define the rock and mineral composition and to formulate an evolutionary model, traditional methods of bulk-rock chemical analyses, and EMPA and LA ICP-MS analyses of rock-forming minerals were combined with the study of macrotextures, TIMA-automated mineralogical mapping of typical rock samples, and CL study of internal texture of quartz and mica crystals. The Argemela stock forms a steep cylindrical body 1 km deep, with an elliptical outcrop 250 x 180 m in size, crosscutting Cambrian schists. The stock comprises two intrusions: a geochemically moderately evolved equigranular facies (0.3 wt% F, 1.2 wt% P2O5, 1850 ppm Li, 310 ppm Sn, 24 ppm Ta, 5 ppm W) composed of albite, quartz, muscovite and minor montebrasite followed by a rather inhomogeneous, more evolved porphyritic facies (0.25-1.2 wt% F, 1.3-1.8 wt% P2O5, 1600-4900 ppm Li, 600-1000 ppm Sn, 40-85 ppm Ta, 3-6 ppm W) composed of quartz, mica and subordinate K-feldspar phenocrysts embedded in an albite-quartz-mica-amblygonite matrix. The later facies is rimmed by stockscheider at the contact with slates, and with an up to 1 m thick layered zone with unidirectional solidification textures along contact with the equigranullar facies. The NE-part of the stock is crosscut by numerous thin quartz veinlets +/- K-feldspar, phosphates and wolframite, while several aplitic dikes and thicker quartz+phosphate veins were found in two boreholes NW of the granite. Porphyritic facies, the most voluminous part of the system, contains strongly zoned phenocrysts of mica (phengite -> lepidolite) and quartz (Ti-enriched to Al, Rb-enriched) indicating crystallization in two magmatic stages, while the equigranular facies and ex

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

LITHOS

ISSN

0024-4937

e-ISSN

1872-6143

Svazek periodika

410-411

Číslo periodika v rámci svazku

106562

Stát vydavatele periodika

NO - Norské království

Počet stran výsledku

25

Strana od-do

„“-„“

Kód UT WoS článku

000762448200002

EID výsledku v databázi Scopus

2-s2.0-85121650151