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@article{1720436,
author = {Slobodník, Marek and Dillingerová, Veronika and Blažeková, Michaela and Huraiová, Monika and Hurai, Vratislav},
article_location = {Basel},
article_number = {12},
doi = {http://dx.doi.org/10.3390/min10121125},
keywords = {apatite; carbonatite; cathodoluminescence; geochemistry; Evate; Mozambique},
language = {eng},
issn = {2075-163X},
journal = {Minerals},
title = {Trace Elements in Apatite as Genetic Indicators of the Evate Apatite-Magnetite Deposit, NE Mozambique},
url = {https://doi.org/10.3390/min10121125},
volume = {10},
year = {2020}
}
TY - JOUR
ID - 1720436
AU - Slobodník, Marek - Dillingerová, Veronika - Blažeková, Michaela - Huraiová, Monika - Hurai, Vratislav
PY - 2020
TI - Trace Elements in Apatite as Genetic Indicators of the Evate Apatite-Magnetite Deposit, NE Mozambique
JF - Minerals
VL - 10
IS - 12
SP - 1-24
EP - 1-24
PB - MDPI
SN - 2075163X
KW - apatite
KW - carbonatite
KW - cathodoluminescence
KW - geochemistry
KW - Evate
KW - Mozambique
UR - https://doi.org/10.3390/min10121125
L2 - https://doi.org/10.3390/min10121125
N2 - The Evate deposit is a Neoproterozoic (~590 Ma) magnetite-apatite-carbonate body emplaced parallel to foliation of the Monapo granulite complex in NE Mozambique. A complicated history of the deposit is recorded in apatite textures visualized in cathodoluminescence (CL) images. In spite of different solid and fluid inclusions, mineral assemblages, and the CL textures, electron probe microanalyses indicate relatively consistent apatite compositions corresponding to fluorapatite (XF = 0.51–0.73, XOH = 0.21–0.47, XCl = 0.02–0.06) with limited belovite- and cesanite-type substitutions. Laser ablation inductively coupled plasma mass spectrometric analyses show that apatites from unaltered magnetite-forsterite-spinel ores are depleted in Y, REE, Ba, and Sr compared to apatites from carbonate-anhydrite ores. Hydrothermally overprinted apatites with complex patchy domain CL textures are enriched in Y-REE in greenish-grey zones, Fe-U-Th in blue zones, and Mn-Sr-Ba in brown domains. Observed CL-emissions in the Evate apatites result from very subtle variations in REE, Mn, and U contents controlled by the variability of redox conditions. The decreased Th:U ratio in the hydrothermally overprinted apatites reflects the oxidation and partial removal of U4+ from the apatite structure during the interaction with oxidizing aqueous fluids capable of transporting U6+. Flat, LREE (La-Sm)-enriched chondrite-normalized patterns with Eu/Eu* = 0.7–1.4 and Ce/Ce* = 0.9–1.5, together with concentrations of diagnostic trace elements (Sr, Mn, Y, REE) are consistent with apatites from magmatic carbonatites and phoscorites. This study corroborates that the Evate deposit is a post-collisional orogenic carbonatite genetically linked with mafic plutonic rocks intruding the Monapo granulite complex after granulite-facies metamorphism, and later overprinted by intensive hydrothermalism. The Evate apatite is peculiar in retaining its pristine magmatic signature despite the extensive hydrothermal-metasomatic alteration accompanied by dissolution-reprecipitation.
ER -
SLOBODNÍK, Marek, Veronika DILLINGEROVÁ, Michaela BLAŽEKOVÁ, Monika HURAIOVÁ a Vratislav HURAI. Trace Elements in Apatite as Genetic Indicators of the Evate Apatite-Magnetite Deposit, NE Mozambique. \textit{Minerals}. Basel: MDPI, 2020, roč.~10, č.~12, s.~1-24. ISSN~2075-163X. Dostupné z: https://dx.doi.org/10.3390/min10121125.
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