The role of the Kupferschiefer in the formation of hydrothermal base-metal mineralization in the Spessart ore district, Germany: insight from detailed sulfur isotope studies

Thomas Wagner, M. Okrusch, S. Weyer, J. Lorenz, Y. Lahaye, H. Taubald, R.T. Schmitt

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

The Spessart district (SW Germany), located at the southwestern margin of the Permian Kupferschiefer basin in Central Europe, hosts abundant stratabound and structurally controlled base metal mineralization. The mineralization styles identified are (1) stratabound Cu-Pb-Zn-(Ag) ores in Zechstein sedimentary rocks, (2) structurally controlled Cu-As-(Ag) ores in Zechstein sedimentary rocks, (3) crosscutting Co-Ni-(Bi)-As and Cu-Fe-As veins, (4) stratabound metasomatic Fe-Mn carbonate ores in Zechstein dolomite, (5) barren barite veins, and (6) Fe-Mn-As veins in Permian rhyolites. Building on previous work that involved mineralogical, textural and chemical characterization of the major mineralization types, we have performed a comprehensive sulfur isotope study that applied both conventional and novel laser-ablation multi-collector ICP-MS techniques. The δ34S values of sulfide minerals from the different ore types are consistently negative and highly variable, in the range between –44.5 to –3.9 ‰, whereas the δ34S values of barite are all positive in the range between 4.7 and 18.9 ‰. Remarkably, stratabound and structurally controlled mineralization in Zechstein sedimentary rocks has the least negative δ34S values, whereas vein-type deposits have consistently more negative δ34S values. The observed pattern of sulfide δ34S values can be best interpreted in terms of fluid mixing at the basement-cover interface. Hydrothermal fluids originating from the crystalline basement migrated upward along subvertical fault zones and were periodically injected into groundwaters that were flowing in the post-Variscan sedimentary cover. These groundwaters had interacted with the Zechstein sedimentary rocks, resulting in fluids characterized by elevated concentrations of reduced sulfur (with negative δ34S values) and alkaline pH. Repeated mixing between both chemically contrasting fluids caused rapid and efficient precipitation of sulfide ore minerals in hydrothermal veins with highly variable but distinctly negative δ34S values.

Originalspråkengelska
TidskriftMineralium Deposita
Volym45
Sidor (från-till)217-239
ISSN0026-4598
DOI
StatusPublicerad - 2010
Externt publiceradJa
MoE-publikationstypA1 Tidskriftsartikel-refererad

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title = "The role of the Kupferschiefer in the formation of hydrothermal base-metal mineralization in the Spessart ore district, Germany: insight from detailed sulfur isotope studies",
abstract = "The Spessart district (SW Germany), located at the southwestern margin of the Permian Kupferschiefer basin in Central Europe, hosts abundant stratabound and structurally controlled base metal mineralization. The mineralization styles identified are (1) stratabound Cu-Pb-Zn-(Ag) ores in Zechstein sedimentary rocks, (2) structurally controlled Cu-As-(Ag) ores in Zechstein sedimentary rocks, (3) crosscutting Co-Ni-(Bi)-As and Cu-Fe-As veins, (4) stratabound metasomatic Fe-Mn carbonate ores in Zechstein dolomite, (5) barren barite veins, and (6) Fe-Mn-As veins in Permian rhyolites. Building on previous work that involved mineralogical, textural and chemical characterization of the major mineralization types, we have performed a comprehensive sulfur isotope study that applied both conventional and novel laser-ablation multi-collector ICP-MS techniques. The δ34S values of sulfide minerals from the different ore types are consistently negative and highly variable, in the range between –44.5 to –3.9 ‰, whereas the δ34S values of barite are all positive in the range between 4.7 and 18.9 ‰. Remarkably, stratabound and structurally controlled mineralization in Zechstein sedimentary rocks has the least negative δ34S values, whereas vein-type deposits have consistently more negative δ34S values. The observed pattern of sulfide δ34S values can be best interpreted in terms of fluid mixing at the basement-cover interface. Hydrothermal fluids originating from the crystalline basement migrated upward along subvertical fault zones and were periodically injected into groundwaters that were flowing in the post-Variscan sedimentary cover. These groundwaters had interacted with the Zechstein sedimentary rocks, resulting in fluids characterized by elevated concentrations of reduced sulfur (with negative δ34S values) and alkaline pH. Repeated mixing between both chemically contrasting fluids caused rapid and efficient precipitation of sulfide ore minerals in hydrothermal veins with highly variable but distinctly negative δ34S values.",
author = "Thomas Wagner and M. Okrusch and S. Weyer and J. Lorenz and Y. Lahaye and H. Taubald and R.T. Schmitt",
year = "2010",
doi = "10.1007/s00126-009-0270-2",
language = "English",
volume = "45",
pages = "217--239",
journal = "Mineralium Deposita",
issn = "0026-4598",
publisher = "Springer",

}

The role of the Kupferschiefer in the formation of hydrothermal base-metal mineralization in the Spessart ore district, Germany: insight from detailed sulfur isotope studies. / Wagner, Thomas; Okrusch, M.; Weyer, S.; Lorenz, J.; Lahaye, Y.; Taubald, H.; Schmitt, R.T.

I: Mineralium Deposita, Vol. 45, 2010, s. 217-239.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - The role of the Kupferschiefer in the formation of hydrothermal base-metal mineralization in the Spessart ore district, Germany: insight from detailed sulfur isotope studies

AU - Wagner, Thomas

AU - Okrusch, M.

AU - Weyer, S.

AU - Lorenz, J.

AU - Lahaye, Y.

AU - Taubald, H.

AU - Schmitt, R.T.

PY - 2010

Y1 - 2010

N2 - The Spessart district (SW Germany), located at the southwestern margin of the Permian Kupferschiefer basin in Central Europe, hosts abundant stratabound and structurally controlled base metal mineralization. The mineralization styles identified are (1) stratabound Cu-Pb-Zn-(Ag) ores in Zechstein sedimentary rocks, (2) structurally controlled Cu-As-(Ag) ores in Zechstein sedimentary rocks, (3) crosscutting Co-Ni-(Bi)-As and Cu-Fe-As veins, (4) stratabound metasomatic Fe-Mn carbonate ores in Zechstein dolomite, (5) barren barite veins, and (6) Fe-Mn-As veins in Permian rhyolites. Building on previous work that involved mineralogical, textural and chemical characterization of the major mineralization types, we have performed a comprehensive sulfur isotope study that applied both conventional and novel laser-ablation multi-collector ICP-MS techniques. The δ34S values of sulfide minerals from the different ore types are consistently negative and highly variable, in the range between –44.5 to –3.9 ‰, whereas the δ34S values of barite are all positive in the range between 4.7 and 18.9 ‰. Remarkably, stratabound and structurally controlled mineralization in Zechstein sedimentary rocks has the least negative δ34S values, whereas vein-type deposits have consistently more negative δ34S values. The observed pattern of sulfide δ34S values can be best interpreted in terms of fluid mixing at the basement-cover interface. Hydrothermal fluids originating from the crystalline basement migrated upward along subvertical fault zones and were periodically injected into groundwaters that were flowing in the post-Variscan sedimentary cover. These groundwaters had interacted with the Zechstein sedimentary rocks, resulting in fluids characterized by elevated concentrations of reduced sulfur (with negative δ34S values) and alkaline pH. Repeated mixing between both chemically contrasting fluids caused rapid and efficient precipitation of sulfide ore minerals in hydrothermal veins with highly variable but distinctly negative δ34S values.

AB - The Spessart district (SW Germany), located at the southwestern margin of the Permian Kupferschiefer basin in Central Europe, hosts abundant stratabound and structurally controlled base metal mineralization. The mineralization styles identified are (1) stratabound Cu-Pb-Zn-(Ag) ores in Zechstein sedimentary rocks, (2) structurally controlled Cu-As-(Ag) ores in Zechstein sedimentary rocks, (3) crosscutting Co-Ni-(Bi)-As and Cu-Fe-As veins, (4) stratabound metasomatic Fe-Mn carbonate ores in Zechstein dolomite, (5) barren barite veins, and (6) Fe-Mn-As veins in Permian rhyolites. Building on previous work that involved mineralogical, textural and chemical characterization of the major mineralization types, we have performed a comprehensive sulfur isotope study that applied both conventional and novel laser-ablation multi-collector ICP-MS techniques. The δ34S values of sulfide minerals from the different ore types are consistently negative and highly variable, in the range between –44.5 to –3.9 ‰, whereas the δ34S values of barite are all positive in the range between 4.7 and 18.9 ‰. Remarkably, stratabound and structurally controlled mineralization in Zechstein sedimentary rocks has the least negative δ34S values, whereas vein-type deposits have consistently more negative δ34S values. The observed pattern of sulfide δ34S values can be best interpreted in terms of fluid mixing at the basement-cover interface. Hydrothermal fluids originating from the crystalline basement migrated upward along subvertical fault zones and were periodically injected into groundwaters that were flowing in the post-Variscan sedimentary cover. These groundwaters had interacted with the Zechstein sedimentary rocks, resulting in fluids characterized by elevated concentrations of reduced sulfur (with negative δ34S values) and alkaline pH. Repeated mixing between both chemically contrasting fluids caused rapid and efficient precipitation of sulfide ore minerals in hydrothermal veins with highly variable but distinctly negative δ34S values.

U2 - 10.1007/s00126-009-0270-2

DO - 10.1007/s00126-009-0270-2

M3 - Article

VL - 45

SP - 217

EP - 239

JO - Mineralium Deposita

JF - Mineralium Deposita

SN - 0026-4598

ER -