Uranium mobilization by fluids associated with Ca–Na metasomatism: A P–T–t record of fluid–rock interactions during Pan-African metamorphism (Western Zambian Copperbelt)

Eglinger, Aurélien; Tarantola, Αlexandre; Durand, Cyril; Ferraina, Clément; Vanderhaeghe, Olivier; André-Mayer, Anne-Sylvie; Paquette, Jean‐Louis; Deloule, Étienne

doi:10.1016/j.chemgeo.2014.07.028

Cited by 21 publications

(17 citation statements)

References 109 publications

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“…. Pluri‐centimetric kyanite porphyroblasts were found in phlogopite schists bearing syn‐metamorphic to post‐metamorphic uranium and copper mineralizations (Roan group, western Copperbelt Zambia) . Millimetric rhombs of calcite were found in calcitic veins oblique to marble foliation of the Kamariza schists (Laurion, Greece).…”

Section: Samplesmentioning

confidence: 99%

Raman spectra of water in fluid inclusions: I. Effect of host mineral birefringence on salinity measurement

Caumon

Tarantola

Mosser‐Ruck

2015

J Raman Spectroscopy

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International audienceRaman microspectrometry of water in individual aqueous fluid inclusions can provide chemical information about fluid composition, in particular the concentration of chloride ions. The regular method consists in correlating the deformation of the OH stretching vibration band of liquid water in the region assigned to hydrogen-bonded OH groups with chloride concentration. In the present study, a set of seven different minerals with various birefringence properties (barite, calcite, celestine, fluorite, kyanite, quartz and siderite) was selected for the analysis of the water band of their hosted aqueous fluid inclusions. The comparison with microthermometry highlighted that any birefringent mineral may affect the determination of salinity carried out by the analysis of the Raman signal of water: the Raman salinity exposed sinusoidal variations when rotating the samples on the microscope stage. This phenomenon was explained by mineral birefringence, and by the polarization properties of the OH stretching vibration band of liquid water and of the spectrometers gratings. A good knowledge of the polarization properties of the optical devices of the Raman spectrometer and a correct positioning of the sample thus result in salinity (chloride concentration) measurements with the same accuracy as classic microthermometry

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Section: Samplesmentioning

confidence: 99%

Raman spectra of water in fluid inclusions: I. Effect of host mineral birefringence on salinity measurement

Caumon

Tarantola

Mosser‐Ruck

2015

J Raman Spectroscopy

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“…22 Ne, 23 Na, 25 Mg, 27 Al, 29 Si, 53 Cr, 55 23 Na, 25 Mg, 29 Si, 34 S, 39 K, 44 Ca, 47 An in-house multi-element solution containing 37 elements (the 33 elements cited above + Rb, Cs, Ba and Sb) at a concentration of ca. 0.1, 1 and 10 mg g À1 each (except Na xed at ca.…”

Section: Methodsmentioning

confidence: 99%

“…Analytical conditions for the three setups are given in Table 1 (Table 3). 47 Additional isotopes, detected by the TOFMS in uid inclusions >10 mm, are 39 K, 55 Mn, 75 As and 121 Sb, which were not included in the isotope selection for the QMS and SFMS. 47 Additional isotopes, detected by the TOFMS in uid inclusions >10 mm, are 39 K, 55 Mn, 75 As and 121 Sb, which were not included in the isotope selection for the QMS and SFMS.…”

Section: Precision and Accuracymentioning

confidence: 99%

Capabilities of sequential and quasi-simultaneous LA-ICPMS for the multi-element analysis of small quantity of liquids (pl to nl): insights from fluid inclusion analysis

Harlaux

Borovinskaya

Frick

et al. 2015

J. Anal. At. Spectrom.

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International audienceThree configurations of inductively coupled plasma mass spectrometers (ICPMS), namely: a quadrupole (QMS) and a sector-field (SFMS), both equipped with a standard cylindrical ablation cell, and an orthogonal time-of-flight (TOFMS), equipped with a fast washout ablation cell, were coupled with the same 193 nm Excimer laser ablation system in order to evaluate their capabilities for measurement of multiple minor and trace elements in small quantities of liquids (pl to nl), such as fluid inclusions. Analyses were performed with different objects: (i) multi-element solutions sealed in silica capillaries of internal diameter of 20 mm serving as synthetic analogues of natural fluid inclusions; (ii) natural two-phase (liquid + vapour) fluid inclusions with low salinity (ca. 4.8 wt% NaCl eq.) and homogeneous compositions, trapped in quartz crystals from the Alps; (iii) natural multi-phase (liquid + vapour + multiple solids) fluid inclusions with high salinity (ca. 13-15 wt% NaCl eq.) and homogeneous compositions, trapped in quartz crystals from the Zambian Copperbelt. This study demonstrates that the SFMS and TOFMS provide improvements, particularly in term of limits of detection (LODs) and precision, compared to the QMS traditionally used for the measurement of fluid inclusions. SFMS leads on average to lower LODs within one order of magnitude compared to QMS and TOFMS, but precision and accuracy are lower due to longer acquisition cycle times. TOFMS presents both advantages of having rapid and quasi-simultaneous acquisition for all isotopes from Li-6 to U-238 in a very short cycle time down to 30 ms, with higher precisions and lower LODs than for QMS for isotopes with m/Q > 11. Its use, coupled to a fast washout cell, leads to (i) the improvement in the analysis of small-size (<10 mu m) and multi-phase fluid inclusions and (ii) detection of higher number of isotopes compared to QMS and SFMS, which are both limited by the number of measured isotopes from short transient signals of fluid inclusions. Consequently, the tested TOFMS, coupled with a fast washout ablation cell, appears to be a promising instrument for the analysis of natural fluid inclusions by LA-ICPMS, especially for small, multi-phase and/or low salinity fluid inclusions

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“…The episyenite deposits of the central Ukrainian uranium province [5] and the Lagoa Real uranium province in Bahia, Brazil [27,86], are prime examples of Proterozoic U-mineralization. It is commonly assumed that U is mobile primarily in oxidized fluids (as uranyl complexes), and deposition happens by reduction of U 6+ to U 4+ due to fluid mixing or interaction with reducing, e.g., sulfide-rich, rocks [45,89]. Recent results by Timofeev et al [90], however, suggest that U 4+ is soluble at >150°C in acidic Cl-rich fluids, in which reduction leads only to change in speciation of U (from UO 2 Cl 2 to UCl 4 ).…”

Section: Uraniummentioning

confidence: 99%

“…U is mobilized by circulation of fluids through faults, fractures, and other interconnected porosity within the fertile sources, followed by deposition of U-minerals within episyenitized channels. Leaching of U-bearing accessory (monazite, zircon, allanite) or major minerals (e.g., muscovite) during episyenitization may also provide some U [45,89]. Formation of significant U-mineralization is generally thought to supersede episyenitization (as in Fig.…”

Section: Uraniummentioning

confidence: 99%

Episyenites—Characteristics, Genetic Constraints, and Mineral Potential

Suikkanen

Rämö

2019

Mining, Metallurgy & Exploration

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Episyenites are sub-solidus, quartz-depleted alkali-feldspar-rich rocks. They form veins and lenticular bodies in granitoid rocks and migmatites in a late-to post-orogenic or anorogenic setting. Leaching of quartz is usually a response to a flux of weakly saline hydrothermal solution in circulation cells above cooling intrusions, where sufficient fluid-rock ratios and thermal gradients are achieved. Fluid Si-undersaturation is achieved by rapid cooling within the field of retrograde Si solubility or by temperature and pressure increase outside retrograde conditions. Some quartz may also be consumed in metasomatic reactions and in response to pressure fluctuation in sealed episyenite bodies. The small size and overall rarity of episyenites imply that conditions for episyenite formation are not commonly encountered in the crust. In addition to quartz depletion, episyenites record complex histories of metasomatic alteration and hydrothermal mineral growth. Nearly all episyenites have undergone Na-metasomatism, which may have led to the formation of nearly monomineralic albitite, and which is occasionally followed by late K-metasomatism, phyllic alteration, and argillization. Depending on the effectiveness of later compaction, recrystallization and vug-filling episyenites may preserve the macroscopic porosity formed by quartz dissolution and brittle deformation. Vuggy episyenites can act as significant sinks for metals carried by crustal fluids and host many significant U, Sn, and Au deposits worldwide. Rare earth-critical syenitic fenites around alkaline intrusions share mineralogical and genetic traits with episyenites.

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Uranium mobilization by fluids associated with Ca–Na metasomatism: A P–T–t record of fluid–rock interactions during Pan-African metamorphism (Western Zambian Copperbelt)

Cited by 21 publications

References 109 publications

Raman spectra of water in fluid inclusions: I. Effect of host mineral birefringence on salinity measurement

Raman spectra of water in fluid inclusions: I. Effect of host mineral birefringence on salinity measurement

Capabilities of sequential and quasi-simultaneous LA-ICPMS for the multi-element analysis of small quantity of liquids (pl to nl): insights from fluid inclusion analysis

Episyenites—Characteristics, Genetic Constraints, and Mineral Potential

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