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

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Joachimski M
Zeitschrift: Chemie Der Erde-Geochemistry
Verlag: Elsevier
Jahr der Veröffentlichung: 1999
Heftnummer: 59
Seitenbereich: 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-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

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

Zuletzt aktualisiert 2018-09-08 um 05:24