Manganese metallogenesis in the Hellenic arc: Case studies from a Triassic rift-related volcaniclastic succession of the Cycladic Blueschist Unit, Greece

Stouraiti, Christina; Lozios, Stylianos; Soukis, Konstantinos; Mavrogonatos, Constantinos; Tsikos, Harilaos; Voudouris, Panagiotis; Wang, Hao; Zamparas, Christoforos; Kollias, Konstantinos

doi:10.1016/j.oregeorev.2022.104694

Cited by 2 publications

(1 citation statement)

References 123 publications

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“…The samples of MLX3 have been analyzed by an Transmission Electron Microscope to verify and characterize the structure of nsutite (Figure 5). TEM results and the selected area electron diffraction patterns (Table 4) confirm that the structure of the mineral is that of nsutite; even so, the X-ray energy dispersive spectra (EDS) indicate that, although the structure of nsutite is present, its chemical composition resembles that of todorokite (Table S1) [42]. The process of hydrothermal fluid alteration can explain this phenomenon.…”

Section: Transmission Electron Microscope Analysismentioning

confidence: 83%

Electrochemical Behavior of Natural Manganese Oxides: Transforming Mining Waste into Energy Storage Materials

Soulamidis,

Kourmousi,

Mitsopoulou

et al. 2024

Minerals

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The present research explores the potential of manganese oxide waste ore in energy storage applications, focusing on supercapacitors. The investigation assesses the electrochemical capabilities of natural manganese oxides obtained from the Drama region, which has been the main mining center of Greece for manganese ore, especially that of battery-grade quality. Samples were collected from abandoned mining sites in the Kato Nevrokopi area, Drama. The structure and composition of the manganese minerals were determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Electrochemical tests involved the preparation of electrodes using natural nsutite and heat-treated nsutite (hausmannite). Then, the designed electrodes were subjected to cyclic voltammetry tests and charge–discharge measurements. The hausmannite electrode exhibited a higher specific capacitance of 667 F/g at a current density of 0.2 A/g, and the electrode material retained 98.3% of its initial capacitance after 1000 cycles. This study provides new perspectives on simple and efficient methods for transforming natural nsutite material from mining waste to hausmannite with greater structural homogeneity and better electrochemical behavior.

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Section: Transmission Electron Microscope Analysismentioning

confidence: 83%

Electrochemical Behavior of Natural Manganese Oxides: Transforming Mining Waste into Energy Storage Materials

Soulamidis,

Kourmousi,

Mitsopoulou

et al. 2024

Minerals

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New Ag-Rich Mn-Zn±Pb Vein Mineralization at the Mavro Xylo Manganese Oxide Deposit, Drama, Greece

Soulamidis,

Stouraiti,

Voudouris

et al. 2024

Minerals

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The manganese deposits at the Kato Nevrokopi area are located in the Drama Basin (Northern Greece) and belong to the Rhodope Metamorphic Province. The deposits were previously exploited for several supergene Mn-oxide ore bodies of massive, battery-grade nsutite, spatially associated with fault zones in the vicinity of Oligocene granitic intrusions. We conducted detailed geological, mineralogical, and geochemical investigations at the Mavro Xylo deposit, which led to the identification of Ag-rich Mn-Zn±Pb vein-type mineralization. The studied paragenesis appears to have developed during two hydrothermal stages: stage I, characterized by the mineral assemblage rhodonite–quartz–rhodochrosite–pyrophanite–pyrite–galena–Te bearing argentite–sphalerite–wurtzite–alabandite, and stage II, dominated by Ag-rich, Mn-Zn±Pb oxides in the form of fracture-fills along a high-angle NE-SW fault zone in brecciated marbles. Bulk analyses of the stage-II oxide assemblage yielded concentrations of Ag up to 0.57 wt.%. In the veins, wurtzite is present in bands, succeeded by manganese oxides, while calcite and quartz are the main gangue minerals. We placed particular emphasis on the occurrence of Ag in high concentrations within distinct manganese oxides. Major silver carriers include Zn-bearing todorokite, chalcophanite, and hydrous Pb-Mn oxide. The vein-type mineralization at Mavro Xylo shares many characteristics with other intermediate-sulfidation epithermal precious metal-rich deposits associated with high Mn concentrations. The evolution of the mineral paragenesis indicates a change in the physicochemical attributes of the ore-forming fluids, from initially reducing (stage I) to oxidizing (stage II). Although the origin of the initial ore-forming fluid remains to be constrained, the above redox change is tentatively attributed to the increasing incursion of meteoric waters over time.

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Manganese metallogenesis in the Hellenic arc: Case studies from a Triassic rift-related volcaniclastic succession of the Cycladic Blueschist Unit, Greece

Cited by 2 publications

References 123 publications

Electrochemical Behavior of Natural Manganese Oxides: Transforming Mining Waste into Energy Storage Materials

Electrochemical Behavior of Natural Manganese Oxides: Transforming Mining Waste into Energy Storage Materials

New Ag-Rich Mn-Zn±Pb Vein Mineralization at the Mavro Xylo Manganese Oxide Deposit, Drama, Greece

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