δ44Ca of Stratabound Fluorite Deposits in Burgundy (France): Tracing Fluid Origin and/or Fractionation Processes
| Autor: | Thierry Augé, Catherine Guerrot, Maurice Pagel, Benjamin Brigaud, Philippe Négrel, Morgane Gigoux, Guillaume Delpech |
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| Přispěvatelé: | Géosciences Paris Sud (GEOPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) |
| Rok vydání: | 2015 |
| Předmět: |
Calcite
Stratabound fluorite deposits 010504 meteorology & atmospheric sciences Metamorphic rock Dolomite Geochemistry Earth and Planetary Sciences(all) General Medicine Ca isotopes 010502 geochemistry & geophysics 01 natural sciences Fluorite Silicate Sr isotopes chemistry.chemical_compound Isotopic signature Morvan Basement (geology) chemistry [SDU]Sciences of the Universe [physics] Carbonate Burgundy Geology 0105 earth and related environmental sciences |
| Zdroj: | Procedia Earth and Planetary Science Procedia Earth and Planetary Science, Elsevier, 2015, 13, pp.129-133. ⟨10.1016/j.proeps.2015.07.031⟩ |
| ISSN: | 1878-5220 |
| DOI: | 10.1016/j.proeps.2015.07.031 |
| Popis: | International audience; Combined Sr and Caisotopic tracers have beenappliedto stratabound fluorite deposits in the central part ofBurgundy (France). These deposits are spatially related to an unconformity between aPalaeozoic granitic and metamorphic basement and Late Triassic sediments. The aim of this work is to trace the origin of fluid(s)fromwhich stratabound fluorite deposits formed. We suggest thatthe variations of the δ44CaSWin fluorite (-0.1 to +0.2‰ relative to seawater sw) could be explained by1)precipitation from a fluid dominated by a Ca isotopic signature similar to that of seawater (calcite or dolomite dissolution from the host-rock) and a Sr isotopic ratio higher than seawater (granitic basement) and involves no fractionation, the preferred scenarioor 2)cristallization from a fluid with a lowδ44CaSW(carbonate and silicate sources) involving fractionationprocesses. |
| Databáze: | OpenAIRE |
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