A Sr isotope study on fluorite and siderite from post-orogenic mineral veins in the eastern Harz Mountains,Germany |
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Authors: | Email author" target="_blank">Jens?SchneiderEmail author Udo?Haack Klaus?Stedingk |
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Institution: | 1.Justus-Liebig-Universit?t Gie?en, Institut für Geowissenschaften und Lithosph?renforschung, Senckenbergstrasse 3, 35390 Giessen, Germany,Germany;2.Landesamt für Geologie und Bergwesen Sachsen-Anhalt, K?thener Strasse 34, 06035 Halle, Germany,Germany |
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Abstract: | Rb–Sr isotope data for siderite and fluorite from sediment-hosted epithermal mineral veins in the eastern Harz Mountains (Germany)
are presented. Several fluorite and siderite-bearing paragenetic stages have been proposed for these veins, with the most
important mineralization being related to a quartz–sulfide and a subsequent calcite–fluorite–quartz stage, which occurred
at 226±1 and 209±2 Ma, respectively. Our Rb–Sr data do not permit the identification of distinct generations of siderite and
fluorite, but rather reveal straight internal mixing relations, reflecting mixing of fluids or differential fluid–rock interaction
processes. This indicates merely two significant phases of mineral deposition related to the quartz–sulfide and calcite–fluorite–quartz
stages. It is shown that the Paleozoic sedimentary host rocks of the veins are the most likely source for the siderite Sr,
whereas fluorite displays a two-component mixture between sedimentary Sr and radiogenic Sr derived from locally occurring
Permian metavolcanic rocks.
Editorial handling: B. Lehmann |
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Keywords: | Harz Mountains Fluorite Siderite Sr isotopes |
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