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

Result code in 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>

Alternative codes found

RIV/67985831:_____/22:00550728

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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

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

—

OECD FORD branch

10500 - Earth and related environmental sciences

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2022

Confidentiality

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

Name of the periodical

LITHOS

ISSN

0024-4937

e-ISSN

1872-6143

Volume of the periodical

410-411

Issue of the periodical within the volume

106562

Country of publishing house

NO - NORWAY

Number of pages

25

Pages from-to

„“-„“

UT code for WoS article

000762448200002

EID of the result in the Scopus database

2-s2.0-85121650151