Fluid mixing forms basement-hosted Pb-Zn deposits: Insight from metal and halogen chemistry of individual fluid inclusions

Tobias Fusswinkel, Thomas Wagner, M. Wälle, T. Wenzel, C.A. Heinrich, G. Markl

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

Fluid mixing across unconformities between crystalline basement and overlying sedimentary basins is commonly invoked as an efficient chemical mechanism for ore deposition, but the origin of basement brines and the process of ore formation have rarely been linked by direct evidence. Using LA-ICPMS microanalysis of individual fluid inclusions with an improved detection approach for anion components, we determined simultaneously the ore metal concentrations and the Cl/Br ratio in texturally well-constrained inclusion assemblages from a basement-hosted quartz-fluorite-barite-Pb-Zn vein system. An inverse correlation between the Pb+Zn concentrations and the Cl/Br mass ratios in the fluid inclusions provides clear evidence for mixing of a basement-derived metal-rich brine and a metal-poor formation water that acquired its salinity from halite dissolution in Triassic evaporites of the sedimentary cover. This mixing of two distinct brines with comparable salinity is recorded during the growth of individual quartz crystals containing small galena inclusions, demonstrating the transient and episodic nature of fluid mixing during mineral deposition.
Originalspråkengelska
TidskriftGeology
Volym41
Utgåva6
Sidor (från-till)679-682
Antal sidor4
ISSN0091-7613
DOI
StatusPublicerad - 2013
MoE-publikationstypA1 Tidskriftsartikel-refererad

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  • 1171 Geovetenskaper

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Fusswinkel, Tobias ; Wagner, Thomas ; Wälle, M. ; Wenzel, T. ; Heinrich, C.A. ; Markl, G. / Fluid mixing forms basement-hosted Pb-Zn deposits: Insight from metal and halogen chemistry of individual fluid inclusions. I: Geology. 2013 ; Vol. 41, Nr. 6. s. 679-682.
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abstract = "Fluid mixing across unconformities between crystalline basement and overlying sedimentary basins is commonly invoked as an efficient chemical mechanism for ore deposition, but the origin of basement brines and the process of ore formation have rarely been linked by direct evidence. Using LA-ICPMS microanalysis of individual fluid inclusions with an improved detection approach for anion components, we determined simultaneously the ore metal concentrations and the Cl/Br ratio in texturally well-constrained inclusion assemblages from a basement-hosted quartz-fluorite-barite-Pb-Zn vein system. An inverse correlation between the Pb+Zn concentrations and the Cl/Br mass ratios in the fluid inclusions provides clear evidence for mixing of a basement-derived metal-rich brine and a metal-poor formation water that acquired its salinity from halite dissolution in Triassic evaporites of the sedimentary cover. This mixing of two distinct brines with comparable salinity is recorded during the growth of individual quartz crystals containing small galena inclusions, demonstrating the transient and episodic nature of fluid mixing during mineral deposition.",
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Fluid mixing forms basement-hosted Pb-Zn deposits: Insight from metal and halogen chemistry of individual fluid inclusions. / Fusswinkel, Tobias; Wagner, Thomas; Wälle, M.; Wenzel, T.; Heinrich, C.A.; Markl, G.

I: Geology, Vol. 41, Nr. 6, 2013, s. 679-682.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - Fluid mixing forms basement-hosted Pb-Zn deposits: Insight from metal and halogen chemistry of individual fluid inclusions

AU - Fusswinkel, Tobias

AU - Wagner, Thomas

AU - Wälle, M.

AU - Wenzel, T.

AU - Heinrich, C.A.

AU - Markl, G.

PY - 2013

Y1 - 2013

N2 - Fluid mixing across unconformities between crystalline basement and overlying sedimentary basins is commonly invoked as an efficient chemical mechanism for ore deposition, but the origin of basement brines and the process of ore formation have rarely been linked by direct evidence. Using LA-ICPMS microanalysis of individual fluid inclusions with an improved detection approach for anion components, we determined simultaneously the ore metal concentrations and the Cl/Br ratio in texturally well-constrained inclusion assemblages from a basement-hosted quartz-fluorite-barite-Pb-Zn vein system. An inverse correlation between the Pb+Zn concentrations and the Cl/Br mass ratios in the fluid inclusions provides clear evidence for mixing of a basement-derived metal-rich brine and a metal-poor formation water that acquired its salinity from halite dissolution in Triassic evaporites of the sedimentary cover. This mixing of two distinct brines with comparable salinity is recorded during the growth of individual quartz crystals containing small galena inclusions, demonstrating the transient and episodic nature of fluid mixing during mineral deposition.

AB - Fluid mixing across unconformities between crystalline basement and overlying sedimentary basins is commonly invoked as an efficient chemical mechanism for ore deposition, but the origin of basement brines and the process of ore formation have rarely been linked by direct evidence. Using LA-ICPMS microanalysis of individual fluid inclusions with an improved detection approach for anion components, we determined simultaneously the ore metal concentrations and the Cl/Br ratio in texturally well-constrained inclusion assemblages from a basement-hosted quartz-fluorite-barite-Pb-Zn vein system. An inverse correlation between the Pb+Zn concentrations and the Cl/Br mass ratios in the fluid inclusions provides clear evidence for mixing of a basement-derived metal-rich brine and a metal-poor formation water that acquired its salinity from halite dissolution in Triassic evaporites of the sedimentary cover. This mixing of two distinct brines with comparable salinity is recorded during the growth of individual quartz crystals containing small galena inclusions, demonstrating the transient and episodic nature of fluid mixing during mineral deposition.

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