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@article{1699296,
author = {Barros, Renata and Kaeter, David and Menuge, Julian F. and Škoda, Radek},
article_location = {Amsterdam},
article_number = {JAN 2020},
doi = {http://dx.doi.org/10.1016/j.lithos.2019.105289},
keywords = {Leinster pegmatite belt; Albite-spodumene pegmatite; Pegmatite zonation; Albitisation},
language = {eng},
issn = {0024-4937},
journal = {Lithos},
title = {Controls on chemical evolution and rare element enrichment in crystallising albite-spodumene pegmatite and wallrocks: Constraints from mineral chemistry},
url = {https://doi.org/10.1016/j.lithos.2019.105289},
volume = {352},
year = {2020}
}
TY - JOUR
ID - 1699296
AU - Barros, Renata - Kaeter, David - Menuge, Julian F. - Škoda, Radek
PY - 2020
TI - Controls on chemical evolution and rare element enrichment in crystallising albite-spodumene pegmatite and wallrocks: Constraints from mineral chemistry
JF - Lithos
VL - 352
IS - JAN 2020
SP - 1-19
EP - 1-19
PB - Elsevier
SN - 00244937
KW - Leinster pegmatite belt
KW - Albite-spodumene pegmatite
KW - Pegmatite zonation
KW - Albitisation
UR - https://doi.org/10.1016/j.lithos.2019.105289
L2 - https://doi.org/10.1016/j.lithos.2019.105289
N2 - Internal differentiation and consequent geochemical evolution in pegmatites are significant processes in the development of economically viable deposits of metal-bearing minerals. Albite-spodumene pegmatites, which represent important resources of Li and Ta worldwide, challenge the general rules of pegmatite petrogenesis as these are nearly homogeneous bodies with little or no intrusion-scale pegmatite zonation. Bulk intrusion concentrations of Li are in the uppermost range obtained by magmatic enrichment experiments, around 2 wt% Li2O, and extensive volumes of saccharoidal or platy albite are present. In Leinster, southeast Ireland, weakly zoned to homogeneous albitised spodumene pegmatites and their wallrocks were studied to compare mineral chemistry variations and understand the internal evolution of pegmatites, characteristics linked to the poor development of zonation, and links between internal evolution and pegmatite-wallrock interactions. Leinster pegmatites present mineralogical, textural and geochemical characteristics coherent with Li-saturation, and possibly supersaturation, prior to crystallisation. Weak border to centre zonation in the thickest bodies can be attributed to geochemically evolved initial melt, likely leading to nearly contemporaneous crystallisation throughout the intrusion and resulting in limited internal geochemical fractionation. Increased abundance of minerals bearing highly incompatible elements (e.g. columbite-group minerals and cassiterite) and network modifiers (e.g. phosphates) in albitite indicates it is a fractionation product from pegmatite crystallisation. Enrichment in incompatible elements B, Li, Rb, Cs and F in spodumene pegmatite exocontacts in different country rock types suggests unmixing of a hydrous fluid from the residual melt after the crystallisation of main pegmatitic assemblages, and that the H2O-rich component was mobilised into country rocks. (C) 2019 Elsevier B.V. All rights reserved.
ER -
BARROS, Renata, David KAETER, Julian F. MENUGE a Radek ŠKODA. Controls on chemical evolution and rare element enrichment in crystallising albite-spodumene pegmatite and wallrocks: Constraints from mineral chemistry. \textit{Lithos}. Amsterdam: Elsevier, 2020, roč.~352, JAN 2020, s.~1-19. ISSN~0024-4937. Dostupné z: https://dx.doi.org/10.1016/j.lithos.2019.105289.
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