Diagenetic alterations of copper sulfides in modern ore-bearing sediments of the Logatchev-1 hydrothermal field (Mid-Atlantic Ridge 14°45′ N)

Габлина, И. Ф.; Semkova, T. A.; Stepanova, T. V.; Gor’kova, N. V.

doi:10.1134/s0024490206010032

Cited by 27 publications

(13 citation statements)

References 11 publications

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“…Depending on the synthesis method and experimental conditions, Cu x S forms different phases with a varying stoichiometry between Cu and S. Generally, Cu x S exists as stable chalcocite Cu 2 S and covellite CuS phases, and several stable and metastable phases with varying stoichiometries between those of stable Cu 2 S and CuS . At least nine different Cu x S phases with different compositions and crystal structures have been identified, including villamaninite (CuS 2 ), covellite (CuS), yarrowite (Cu 1.12 S), spionkopite (Cu 1.39 S), geerite (Cu 1.6 S), anilite (Cu 1.75 S), digenite (Cu 1.8 S), djurleite (Cu 1.96 S), and chalcocite (Cu 2 S) . Among the various Cu x S materials, covellite CuS has the highest concentration of hole density of ∼10 21 cm –3 and the highest copper deficiency exhibiting strong p‐type metallic character.…”

Section: Figurementioning

confidence: 99%

Synthesis of Cu_xS Thin Films with Tunable Localized Surface Plasmon Resonances

Kalanur

Seo

2018

ChemistrySelect

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In this work, we report the fabrication of copper sulfide (CuS, Cu1.39S, and Cu2S) thin films with tunable localized surface plasmon resonance (LSPR). The thin films were synthesized by keeping the Cu precursor concentration constant and varying that of sodium thiosulfate, which dictated the final CuxS product. CuS showed the highest intensity LSPR peak and its intensity decreased with the increasing incorporation of Cu, as in the case of Cu1.39S, and vanished for the Cu‐rich Cu2S, indicating carrier concentration‐dependent plasmonic absorption. The shift in the XRD peak positions towards a lower degree and the increase in the d‐spacing values for CuS indicated the intercalation of Cu species in the initial covellite lattice, yielding Cu1.39S and Cu2S in the process. XPS valence band edge studies revealed that among the synthesized CuxS thin films, CuS showed a stronger p‐type as compared to Cu1.39S and Cu2S.

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Section: Figurementioning

confidence: 99%

Synthesis of Cu_xS Thin Films with Tunable Localized Surface Plasmon Resonances

Kalanur

Seo

2018

ChemistrySelect

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“…Results of the thermodynamic model presented above in conjunction with previous thermodynamic studies predict that magnesite should form during reaction of oceanic serpentinite and CO 2 -bearing aqueous fluids (e.g., ). Yet, few studies have reported magnesite in oceanic serpentinite (Gablina et al, 2006), suggesting that it is rare in subseafloor environments or has yet to be sampled. Clinopyroxene is known to remain stable during serpentinization of harzburgite due to the relatively low aSiO 2(aq) imposed by serpentine and brucite while olivine and orthopyroxene undergo complete serpentinization (e.g., .…”

Section: Implications For Carbonate Formation In Active and Fossil Ocmentioning

confidence: 99%

“…Whereas magnesite commonly occurs in ultramafic outcrops on land, it is rarely found in association with carbonate-altered mantle rocks in oceanic settings (Gablina et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Carbon and mineral transformations in seafloor serpentinization systems

Grozeva¹

2018

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This thesis examines abiotic processes controlling the transformation and distribution of carbon compounds in seafloor hydrothermal systems hosted in ultramafic rock. These processes have a direct impact on carbon budgets in the oceanic lithosphere and on the sustenance of microorganisms inhabiting hydrothermal vent ecosystems. Where mantle peridotite interacts with carbon-bearing aqueous fluids in the subseafloor, dissolved inorganic carbon can precipitate as carbonate minerals or undergo reduction by H 2(aq) to form reduced carbon species. In Chapters 2 and 3, I conduct laboratory experiments to assess the relative extents of carbonate formation and CO 2 reduction during alteration of peridotite by CO 2(aq)-rich fluids. Results from these experiments reveal that formation of carbonate minerals is favorable on laboratory timescales, even at high H 2(aq) concentrations generated by serpentinization reactions. Although CO 2(aq) attains rapid metastable equilibrium with formate, formation of thermodynamically stable CH 4(aq) is kinetically limited on timescales relevant for active fluid circulation in the subseafloor. It has been proposed that CH 4 and potentially longer-chain hydrocarbons may be sourced, instead, from fluid inclusions hosted in plutonic and mantle rocks. Chapter 4 analyzes CH 4-rich fluid inclusions in olivine-rich basement rocks from the Von Damm hydrothermal field and the Zambales ophiolite to better understand the origin of abiotic hydrocarbons in ultramaficinfluenced hydrothermal systems. Comparisons of hydrocarbon abundances and stable isotopic compositions in fluid inclusions and associated vent fluids suggest that fluid inclusions may provide a significant contribution of abiotic hydrocarbons to both submarine and continental serpentinization systems.

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“…Seafloor weathering (halmyrolysis s.s.) and the related dissolution, breakdown and reworking of consolidated ores of ancient sulfide mounds have been suggested for the origin of sulfide breccias and fine-grained sulfide sandstones leading through to full oxidation, leaching and development of enrichment zones [10][11][12]. This model has been confirmed as a viable mechanism through the detailed study of eroded modern smoker mounds, in which supergene enrichment results in complete or partial replacement of primary sulfides by secondary sulfides and the formation of gossans [13][14][15].…”

Section: Introductionmentioning

confidence: 96%

Mineralogical Features of Ore Diagenites in the Urals Massive Sulfide Deposits, Russia

et al. 2019

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In weakly metamorphosed massive sulfide deposits of the Urals (Dergamysh, Yubileynoe, Yaman-Kasy, Molodezhnoe, Valentorskoe, Aleksandrinskoe, Saf’yanovskoe), banded sulfides (ore diagenites) are recognized as the products of seafloor supergene alteration (halmyrolysis) of fine-clastic sulfide sediments and further diagenesis leading to the formation of authigenic mineralization. The ore diagenites are subdivided into pyrrhotite-, chalcopyrite-, bornite-, sphalerite-, barite- and hematite-rich types. The relative contents of sphalerite-, bornite- and barite-rich facies increases in the progression from ultramafic (=Atlantic) to bimodal mafic (=Uralian) and bimodal felsic (=Baymak and Rudny Altay) types of massive sulfide deposits. The ore diagenites have lost primary features within the ore clasts and dominantly exhibit replacement and neo-formed nodular microtextures. The evolution of the mineralogy is dependent on the original primary composition, sizes and proportions of the hydrothermal ore clasts mixed with lithic serpentinite and hyaloclastic volcanic fragments together with carbonaceous and calcareous fragments. Each type of ore diagenite is characterized by specific rare mineral assemblages: Cu–Co–Ni sulfides are common in pyrrhotite-rich diagenites; tellurides and selenides in chalcopyrite-rich diagenites; minerals of the germanite group and Cu–Ag and Cu–Sn sulfides in bornite-rich diagenites; abundant galena and sulfosalts in barite- and sphalerite-rich diagenites and diverse tellurides characterize hematite-rich diagenites. Native gold in variable amounts is typical of all types of diagenites.

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Diagenetic alterations of copper sulfides in modern ore-bearing sediments of the Logatchev-1 hydrothermal field (Mid-Atlantic Ridge 14°45′ N)

Cited by 27 publications

References 11 publications

Synthesis of Cu_xS Thin Films with Tunable Localized Surface Plasmon Resonances

Synthesis of Cu_xS Thin Films with Tunable Localized Surface Plasmon Resonances

Carbon and mineral transformations in seafloor serpentinization systems

Mineralogical Features of Ore Diagenites in the Urals Massive Sulfide Deposits, Russia

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Diagenetic alterations of copper sulfides in modern ore-bearing sediments of the Logatchev-1 hydrothermal field (Mid-Atlantic Ridge 14°45′ N)

Cited by 27 publications

References 11 publications

Synthesis of CuxS Thin Films with Tunable Localized Surface Plasmon Resonances

Synthesis of CuxS Thin Films with Tunable Localized Surface Plasmon Resonances

Carbon and mineral transformations in seafloor serpentinization systems

Mineralogical Features of Ore Diagenites in the Urals Massive Sulfide Deposits, Russia

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Synthesis of Cu_xS Thin Films with Tunable Localized Surface Plasmon Resonances

Synthesis of Cu_xS Thin Films with Tunable Localized Surface Plasmon Resonances