Compositional variations of zirconolite from the Evate apatite deposit (Mozambique) as an indicator of magmatic-hydrothermal conditions during post-orogenic collapse of Gondwana

Hurai, Vratislav; Huraiová, Monika; Gajdošová, Michaela; Konečný, Petr; Slobodník, Marek; Siegfried, Pete R.

doi:10.1007/s00710-017-0538-7

Cited by 10 publications

(8 citation statements)

References 57 publications

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“…In natural zirconolite, it contains not only actinides and lanthanides but also charge compensators like Al 3+ and Fe 3+ . Thus, researchers proposed to immobilize actinides into Ca site of zirconolite with using Al or Fe as the charge compensator to replace Ti sites.…”

Section: Introductionmentioning

confidence: 99%

“…29,31 In natural zirconolite, it contains not only actinides and lanthanides but also charge compensators like Al 3+ and Fe 3+ . 18,[32][33][34] Thus, researchers proposed to immobilize actinides into Ca site of zirconolite with using Al or Fe as the charge compensator to replace Ti sites. Vance et al reported that the solubility of Nd, Ce, U, Pu, Np in zirconolite-2M has a range from 10% to 65% when Al 3+ replacing Ti 4+ sites.…”

Section: Introductionmentioning

confidence: 99%

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Synchrotron x‐ray spectroscopy investigation of the Ca_1−xLn_xZrTi_2−x(Al, Fe)_xO₇ zirconolite ceramics (Ln = La, Nd, Gd, Ho, Yb)

Liao

et al. 2019

J Am Ceram Soc

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When incorporating actinides into zirconolite for high‐level radioactive waste immobilization, Al3+ and Fe3+ ions generally act as charge compensators. In this study, we rationally designed a series of Ca1-xLnxZrTi2-x)(Al,0.166667emFexnormalO7 (Ln = La, Nd, Gd, Ho, Yb) to unravel the dopant solubility and evolutions of the crystalline phase and local environment of cations through synchrotron X‐ray methods. It was found that single zirconolite phase is difficult to obtain and the fraction of perovskite have an increase with x from 0.1 to 0.9 in Ca1-xLaxZrTi2-x)(Al,0.166667emFexnormalO7. Formation of both zirconolite‐2M and zirconolite‐3O phases was observed in Ca1-xNdxZrTi2-x)(Al,0.166667emFexnormalO7 and Ca1-xGdxZrTi2-x)(Al,0.166667emFexnormalO7. Phase transformation from zirconolite‐2M to 3O occurs at x = 0.7 for Ca1-xNdxZrTi2-x)(Al,0.166667emFexnormalO7 while x = 0.9 for Ca1-xGdxZrTi2-x)(Al,0.166667emFexnormalO7. The solubility of Ca1-xHoxZrTi2-x)(Al,0.166667emFexnormalO7 and Ca1-xYbxZrTi2-x)(Al,0.166667emFexnormalO7 to form single zirconolite‐2M can reach to 0.9 f.u. and 0.7 f.u., respectively. The evolution of lattice parameters of zirconolite in Ca1-xLnxZrTi2-x)(Al,0.166667emFexnormalO7 is greatly related to the ionic radii of cations and substitution mechanism among the cations. X‐ray absorption near edge spectroscopy revealed that Fe3+ ions replace both five‐ and six‐coordinated Ti sites and the ratio of TiO5 to TiO6 decreases when increasing dopant concentration in the Ca1-xHoxZrTi2-x)(Al,0.166667emFexnormalO7. For the local environment of Zr4+, the major form is ZrO7 with a trace of ZrO8.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synchrotron x‐ray spectroscopy investigation of the Ca_1−xLn_xZrTi_2−x(Al, Fe)_xO₇ zirconolite ceramics (Ln = La, Nd, Gd, Ho, Yb)

Liao

et al. 2019

J Am Ceram Soc

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“…The Fe 3+ /Fe tot ratios recalculated from stoichiometry based on four cations and the cationic charge equal to 14 [31] The zirconolite compositions from Hajnáčka diatreme project within the triangle area bounded by REE-rich members of the zirconolite group-that is, steffanweissite, laachite, and nöggerathite (Figure 11c). One outlier falls outside the field, close to the Ca-apex diagnostic of the common REE-depleted zirconolite CaZrTi 2 O 7 .…”

Section: Zirconolitementioning

confidence: 99%

REE Minerals as Geochemical Proxies of Late-Tertiary Alkalic Silicate ± Carbonatite Intrusions Beneath Carpathian Back-Arc Basin

2021

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The accessory mineral assemblage (AMA) of igneous cumulate xenoliths in volcanoclastic deposits and lava flows in the Carpathian back-arc basin testifies to the composition of intrusive complexes sampled by Upper Miocene-Pliocene basalt volcanoes. The magmatic reservoir beneath Pinciná maar is composed of gabbro, moderately alkalic to alkali-calcic syenite, and calcic orthopyroxene granite (pincinite). The intrusive complex beneath the wider area around Fiľakovo and Hajnáčka maars contains mafic cumulates, alkalic syenite, carbonatite, and calc-alkalic granite. Both reservoirs originated during the basaltic magma underplating, differentiation, and interaction with the surrounding mantle and crust. The AMA of syenites is characterized by yttrialite-Y, britholite-Y, britholite-Ce, chevkinite-Ce, monazite-Ce, and rhabdophane(?). Baddeleyite and REE-zirconolite are typical of alkalic syenite associated with carbonatite. Pyrochlore, columbite-Mn, and Ca-niobates occur in calc-alkalic granites with strong peralkalic affinity. Nb-rutile, niobian ilmenite, and fergusonite-Y are crystallized from mildly alkalic syenite and calc-alkalic granite. Zircons with increased Hf/Zr and Th/U ratios occur in all felsic-to-intermediate rock-types. If rock fragments are absent in the volcanic ejecta, the composition of the sub-volcanic reservoir can be reconstructed from the specific AMA and zircon xenocrysts–xenolith relics disintegrated during the basaltic magma fragmentation and explosion.

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“…Hence, the formation within an extension zone of a collapsed orogen [14] is plausible. Moreover, the Late Cambrian-to-Late Ordovician zirconolite, monazite, and uranothorite indicate an extensive hydrothermal-metasomatic overprint coincidental with the Early Palaeozoic rifting [9,15].…”

Section: Introductionmentioning

confidence: 99%

Trace Elements in Apatite as Genetic Indicators of the Evate Apatite-Magnetite Deposit, NE Mozambique

et al. 2020

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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.

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Compositional variations of zirconolite from the Evate apatite deposit (Mozambique) as an indicator of magmatic-hydrothermal conditions during post-orogenic collapse of Gondwana

Cited by 10 publications

References 57 publications

Synchrotron x‐ray spectroscopy investigation of the Ca_1−xLn_xZrTi_2−x(Al, Fe)_xO₇ zirconolite ceramics (Ln = La, Nd, Gd, Ho, Yb)

Synchrotron x‐ray spectroscopy investigation of the Ca_1−xLn_xZrTi_2−x(Al, Fe)_xO₇ zirconolite ceramics (Ln = La, Nd, Gd, Ho, Yb)

REE Minerals as Geochemical Proxies of Late-Tertiary Alkalic Silicate ± Carbonatite Intrusions Beneath Carpathian Back-Arc Basin

Trace Elements in Apatite as Genetic Indicators of the Evate Apatite-Magnetite Deposit, NE Mozambique

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Compositional variations of zirconolite from the Evate apatite deposit (Mozambique) as an indicator of magmatic-hydrothermal conditions during post-orogenic collapse of Gondwana

Cited by 10 publications

References 57 publications

Synchrotron x‐ray spectroscopy investigation of the Ca1−xLnxZrTi2−x(Al, Fe)xO7 zirconolite ceramics (Ln = La, Nd, Gd, Ho, Yb)

Synchrotron x‐ray spectroscopy investigation of the Ca1−xLnxZrTi2−x(Al, Fe)xO7 zirconolite ceramics (Ln = La, Nd, Gd, Ho, Yb)

REE Minerals as Geochemical Proxies of Late-Tertiary Alkalic Silicate ± Carbonatite Intrusions Beneath Carpathian Back-Arc Basin

Trace Elements in Apatite as Genetic Indicators of the Evate Apatite-Magnetite Deposit, NE Mozambique

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Synchrotron x‐ray spectroscopy investigation of the Ca_1−xLn_xZrTi_2−x(Al, Fe)_xO₇ zirconolite ceramics (Ln = La, Nd, Gd, Ho, Yb)

Synchrotron x‐ray spectroscopy investigation of the Ca_1−xLn_xZrTi_2−x(Al, Fe)_xO₇ zirconolite ceramics (Ln = La, Nd, Gd, Ho, Yb)