Trace element and stable isotope geochemistry of secondary carbonates in alkaline volcanic rocks of the Rhoen, Germany.

Journal article
(Original article)


Publication Details

Author(s): Joachimski M
Journal: Chemie Der Erde-Geochemistry
Publisher: Elsevier
Publication year: 1999
Journal issue: 59
Pages range: 105-121.
ISSN: 0009-2819


Abstract


Carbonates occurring as accessory phases within volcanic rocks are often interpreted as being of meteoric water origin. Contary to this model, trace element studies in chloroacetic acid leachates from rocks of the tertiary intracontinental alkaline volcanic field of the Rhoen (Germany) give evidence that the precipitation of the carbonates was imprinted by highly evolved late magmatic fluids. High concentrations of F, Sr, Ba, and the REE indicate that the volcanic rocks were affected by magmatogenic carbonate rich fluids. δ13C covers a range from -2.9 to -14.2‰ PDB and the δ18O values lie between 26.9 and 34.2‰ SMOW. The carbon isotopes have primary magmatic character with a shift to isotopic light carbon. The oxygen isotopes indicate equilibration with fluids of a meteoric-hydrothermal system at low temperatures. Based on these data, a two-step model is proposed for the genesis including a first late magmatic stage and a later secondary low temperature alteration.



FAU Authors / FAU Editors

Joachimski, Michael Prof. Dr.
Lehrstuhl für Geologie (Exogene Dynamik)

Last updated on 2018-09-08 at 05:24