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| Titel |
Vein mineralizations - record of paleo-fluid systems in the Thuringian basin (Germany) |
| VerfasserIn |
Petra Lepetit, Lothar Viereck, Michael Abratis, Stefanie Fritsch |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100100
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| Publikation (Nr.) |
 EGU/EGU2014-15983.pdf |
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| Zusammenfassung |
| Vein-related mineralizations within the Mesozoic sediments of the Thuringian basin
(Germany) are investigated in analytical detail (petrography, XRD, XRF, EPMA,
LA-ICP-MS, and isotope studies: O, C, S, Sr) in order to characterize paleo-fluid systems that
intruded the basin and circulated within it millions of years ago. Samples from 55
outcrops, 34 quarries and 21 drill cores comprise mainly carbonates (calcite, dolomite,
siderite, ankerite), additional sulfates (gypsum, celestine, barite,), and rarely sulfides.
The mineralizations are almost exclusively restricted to WNW-ESE trending fault
systems.
First δ13C and δ18O isotope analyses of calcite mineralizations reveal differences between
veins within Triassic sediments (Lower Muschelkalk: δ13C: 1.8 to 2.9 o, mean 2.3 o, δ18O:
-7.3 to -10.4 o, mean -8.2 o) and Jurassic sediments (δ13C: -0.7 to -2.1 o, mean -1.4 o,
δ18O: -9.3 to -10.6 o, mean -9.9 o), indicating intra-formational and extra-formational
paleo-fluid transport.
Also first δ34S and δ18O isotope analyses of gypsum mineralizations display differences
between veins within Triassic and Permian sediments, respectively. These initial data are
comparable with isotope analyses of vein-related host rocks and hydrochemical signatures of
recent well waters in the Thuringian basin indicating intra-formational in addition to
extra-formational paleo-fluid transport.
Further isotope studies are in progress including high resolution in situ-Sr- isotope analysis.
The present study is part of INFLUINS, a BMBF-funded project bundle, which is dedicated
to the comprehensive description and understanding of the fluid systems within the
Thuringian basin in time and space. |
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