PuSH - Publikationsserver des Helmholtz Zentrums München: Stable isotope disequilibria in travertine from high pH waters: Laboratory investigations and field observations from Oman.

Informationen

Hinweise zu Qualitätskriterien von Zeitschriften

Open-Access-Richtlinie der Helmholtz-Gemeinschaft 2016

CC Licencences

Metriken für Publikationen

Navigation

Startseite

English

EVA: Veröffentlichen

Neuer EVA Antrag

Recherche

Erweiterte Suche

Durchblättern nach ...

... HMGU-Autoren/Konsortien

... Organisationsstruktur

... Zeitschriften

... Publikationstypen

... Forschungsdaten

... Arbeitsgruppen

... Erscheinungsjahr

Publikationen im Überblick

Statistik

HGF Fortschrittsbericht

OA Publikationen

Eintragen

Neue Publikation eintragen

Neue Publikation holen aus...

...EVA

Fehlende Publikation melden

Highlights

Suche

Hilfe & Kontakt

Ansprechpartner

Hilfe

Datenschutz

Helmholtz Open Science

Bibliometrische Indikatoren

SHERPA/RoMEO

DOAJ

Export:

Text

Endnote (RIS) BIB

BibTeX

Clark, I.D.* ; Fontes., J.C.* ; Fritz, P.J.

Stable isotope disequilibria in travertine from high pH waters: Laboratory investigations and field observations from Oman.

Geochim. Cosmochim. Acta 56, 2041-2050 (1992)

DOI

Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

Abstract
Metriken
Zusatzinfos

Ultramafic rocks in northern Oman host unusual, hyperalkaline groundwaters (pH > 11.5) which precipitate inorganic travertine by diffusive uptake of atmospheric CO2 after discharge. Stable isotope fractionation during CO2 uptake results in strong depletions of the carbonate phase (δ13C values as low as -27.5‰ and δ18O values of -16.9‰ PDB). Experiments under closed and open system conditions show that a kinetic depletion in the order of 15.5‰ for 13C occurs during hydroxylation of aqueous CO2 (CO2(aq) + OH- reaction), attributed to a lower activation energy for 12C-O vs 13C-O. The observed 18O depletion can be accounted for by CO2 reaction with OH- (ε{lunate}18OOH--H2O ≅ -40‰) without subsequent exchange and with no evidence of significant additional kinetic effects. Calculated reaction rates show hydroxylation to be the rate limiting step and that CO2(g)-CO2(aq) exchange at the gas/solution interface achieves isotopic equilibrium.

Impact Factor

Scopus SNIP

Scopus
Cited By

Altmetric

0.000