About: Zinc and sulfur isotope variation in sphalerite from carbonate-hosted zinc deposits, Cantabria, Spain     Goto   Sponge   NotDistinct   Permalink

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  • The two generations of sphalerite at Picos de Europa show different δ66Zn values (stage 1 sphalerite +0.24 per mil and stage 2 sphalerite from –0.75 to +0.08 per mil). Both generations also differ in the sulfur isotope composition (stage 1 has δ34S = +6.6; and stage 2 has δ34S = -0.9 to +2.9 per mil) and the chemical composition (stage 1 sphalerite, compared to stage 2 sphalerite, is significantly enriched in Pb, As, Mn, Sb, slightly enriched in Ag, Ni and Cu and depleted in Co, Ga, Tl, Te, Ge and Sn ). We suggest that Zn isotope fractionation was controlled predominantly by pH and T changes. High Zn isotope values reflect rapid precipitation of sphalerite from higher-temperature acidic fluids that carried Zn mostly as chloride species after interaction with carbonate rocks while lower Zn isotope values most likely resulted from a longer precipitation process from fluid at higher pH and decreasing T that carried dominantly Zn sulfide species. At La Florida, sphalerite samples show light 66Zn-depleted signatures with δ66Zn values from –0.80 to –0.01 per mil (mostly between –0.80 and –0.24 per mil) and δ34S values from +10.7 to +15.7 per mil without any relationship between the δ66Zn and δ34S values. Here, the variation in Zn isotope values is interpreted as related to mixing of fluids from two reservoirs. The Zn was carried by a single deep-seated and higher T (~250 - 320°C) fluid and precipitation took place after mixing with a connate S-rich fluid in a system with mH2S>mZn2+ as a result of change in pH, T and Zn predominant species. The light δ66Zn accompanied by heavy δ34S values resulted from fractionation of Zn aqueous sulfides at near-neutral pH and decreasing T. Hydrozincite samples show much heavier δ66Zn values (+0.21 to +0.33 per mil), consistent with fractionation during supergene processes.
  • The two generations of sphalerite at Picos de Europa show different δ66Zn values (stage 1 sphalerite +0.24 per mil and stage 2 sphalerite from –0.75 to +0.08 per mil). Both generations also differ in the sulfur isotope composition (stage 1 has δ34S = +6.6; and stage 2 has δ34S = -0.9 to +2.9 per mil) and the chemical composition (stage 1 sphalerite, compared to stage 2 sphalerite, is significantly enriched in Pb, As, Mn, Sb, slightly enriched in Ag, Ni and Cu and depleted in Co, Ga, Tl, Te, Ge and Sn ). We suggest that Zn isotope fractionation was controlled predominantly by pH and T changes. High Zn isotope values reflect rapid precipitation of sphalerite from higher-temperature acidic fluids that carried Zn mostly as chloride species after interaction with carbonate rocks while lower Zn isotope values most likely resulted from a longer precipitation process from fluid at higher pH and decreasing T that carried dominantly Zn sulfide species. At La Florida, sphalerite samples show light 66Zn-depleted signatures with δ66Zn values from –0.80 to –0.01 per mil (mostly between –0.80 and –0.24 per mil) and δ34S values from +10.7 to +15.7 per mil without any relationship between the δ66Zn and δ34S values. Here, the variation in Zn isotope values is interpreted as related to mixing of fluids from two reservoirs. The Zn was carried by a single deep-seated and higher T (~250 - 320°C) fluid and precipitation took place after mixing with a connate S-rich fluid in a system with mH2S>mZn2+ as a result of change in pH, T and Zn predominant species. The light δ66Zn accompanied by heavy δ34S values resulted from fractionation of Zn aqueous sulfides at near-neutral pH and decreasing T. Hydrozincite samples show much heavier δ66Zn values (+0.21 to +0.33 per mil), consistent with fractionation during supergene processes. (en)
Title
  • Zinc and sulfur isotope variation in sphalerite from carbonate-hosted zinc deposits, Cantabria, Spain
  • Zinc and sulfur isotope variation in sphalerite from carbonate-hosted zinc deposits, Cantabria, Spain (en)
skos:prefLabel
  • Zinc and sulfur isotope variation in sphalerite from carbonate-hosted zinc deposits, Cantabria, Spain
  • Zinc and sulfur isotope variation in sphalerite from carbonate-hosted zinc deposits, Cantabria, Spain (en)
skos:notation
  • RIV/00025798:_____/14:00000128!RIV15-MSM-00025798
http://linked.open...avai/riv/aktivita
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  • I, P(LG13006)
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  • 7
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  • 57379
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  • RIV/00025798:_____/14:00000128
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  • zinc isotopes, sulfur isotopes, sphalerite, carbonate-hosted base metal deposits, Aliva mine, La Florida mine, Cantabria, Spain (en)
http://linked.open.../riv/klicoveSlovo
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  • DE - Spolková republika Německo
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  • [84D7E19441F4]
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  • Mineralium Deposita
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  • 49
http://linked.open...iv/tvurceVysledku
  • Pašava, Jan
  • Chrastný, Vladislav
  • Tornos, Fernando
http://linked.open...ain/vavai/riv/wos
  • 000342495500002
issn
  • 0026-4598
number of pages
http://bibframe.org/vocab/doi
  • 10.1007/s00126-014-0535-2
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