Temperature dependence of oxygen- and clumped isotope fractionation in carbonates: A study of travertines and tufas in the 6?95 C temperature range
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Tartalom: http://www.sciencedirect.com/science/article/pii/S0016703...
Archívum: MTA Könyvtár
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Type = Article
Cím:
Temperature dependence of oxygen- and clumped isotope fractionation in carbonates: A study of travertines and tufas in the 6?95 C temperature range
Létrehozó:
Kele, Sándor
Breitenbach, Sebastian F. M.
Capezzuoli, Enrico
Meckler, A. Nele
Ziegler, Martin
Millan, Isabel M.
Kluge, Tobias
Deák, József
Hanselmann, Kurt
John, Cédric M.
Yan, Hao
Liu, Zaihua
Bernasconi, Stefano M.
Dátum:
2015-11-01
Téma:
QE02 Geochemistry / geokémia
Tartalmi leírás:
Conventional carbonate?water oxygen isotope thermometry and the more recently developed clumped isotope thermometer have
been widely used for the reconstruction of aleotemperatures from a variety of carbonate materials. In spite of a large number of studies, however, there are still large uncertainties in both d18O- and D47-based temperature calibrations. For this reason there is a need to better understand the controls on isotope fractionation especially on natural carbonates. In this study we analyzed oxygen,
carbon and clumped isotopes of a unique set of modern calcitic and aragonitic travertines, tufa and cave deposits from natural springs and wells. Together these samples cover a temperature range from 6 to 95 ?C. Travertine samples were collected close to the vents of the springs and from pools, and tufa samples were collected from karstic creeks and a cave. The majority of our vent and pool travertines and tufa samples show a carbonate?water oxygen isotope fractionation comparable to the one of Tremaine et al. (2011) with some samples showing higher fractionations. No significant difference between the calcite?water and aragonite?water oxygen isotope fractionation could be observed. The D47 data from the travertines show a strong relationship with temperature
and define the regression D47 = (0.044 ± 0.005 ? 106)/T2 + (0.205 ± 0.047). The pH of the parent solution, mineralogy and precipitation rate do not appear to significantly affect the D47-signature of carbonates, compared to the temperature effect and the analytical error. The tufa samples and three biogenic calcites show an excellent fit with the travertine calibration, indicating that this
regression can be used for other carbonates as well. This work extends the calibration range of the clumped isotope thermometer to travertine and tufa deposits in the temperature range from 6 ?C to 95 ?C.
Típus:
Article
PeerReviewed
Formátum:
text
Azonosító:
Kele, Sándor and Breitenbach, Sebastian F. M. and Capezzuoli, Enrico and Meckler, A. Nele and Ziegler, Martin and Millan, Isabel M. and Kluge, Tobias and Deák, József and Hanselmann, Kurt and John, Cédric M. and Yan, Hao and Liu, Zaihua and Bernasconi, Stefano M. (2015) Temperature dependence of oxygen- and clumped isotope fractionation in carbonates: A study of travertines and tufas in the 6?95 C temperature range. Geochimica et Cosmochimica Acta (168). pp. 172-192. ISSN 0016-7037
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