Universität zu Köln

Bajnai, David ORCID: 0000-0002-4053-5056, Coplen, Tyler B., Methner, Katharina, Loeffler, Niklas, Krsnik, Emilija and Fiebig, Jens (2021). Devils Hole Calcite Was Precipitated at +/- 1 degrees C Stable Aquifer Temperatures During the Last Half Million Years. Geophys. Res. Lett., 48 (11). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

Subaqueous carbonates from the Devils Hole caves (southwestern USA) provide a continuous Holocene to Pleistocene North American paleoclimate record. The accuracy of this record relies on two assumptions: That carbonates precipitated close to isotope equilibrium and that groundwater temperature did not change significantly in the last 570 thousand years. Here, we investigate these assumptions using dual clumped isotope thermometry. This method relies on simultaneous analyses of carbonate increment (47) and increment (48) values and provides information on the existence and extent of kinetic isotope fractionation. Our results confirm the hypothesis that calcite precipitation occurred close to oxygen and clumped isotope equilibrium during the last half million years in Devils Hole. In addition, we provide evidence that aquifer temperatures varied by less than +/- 1 degrees C during this interval. Thus, the Devils Hole calcite delta O-18 time series exclusively represents changes in groundwater delta O-18 values.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bajnai, David UNSPECIFIED orcid.org/0000-0002-4053-5056 UNSPECIFIED Coplen, Tyler B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Methner, Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED Loeffler, Niklas UNSPECIFIED UNSPECIFIED UNSPECIFIED Krsnik, Emilija UNSPECIFIED UNSPECIFIED UNSPECIFIED Fiebig, Jens UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-593821
DOI:	10.1029/2021GL093257
Journal or Publication Title:	Geophys. Res. Lett.
Volume:	48
Number:	11
Date:	2021
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	1944-8007
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CAVE SPELEOTHEMS; CLIMATE RECORD; VEIN CALCITE; ISOTOPE; NEVADA; CARBON; CO2; FRACTIONATION; PALEOCLIMATE; CALIBRATION Multiple languages Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59382