Other formats:
BibTeX
LaTeX
RIS
@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 and 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, vol.~352, JAN 2020, p.~1-19. ISSN~0024-4937. Available from: https://dx.doi.org/10.1016/j.lithos.2019.105289.
|