Universität zu Köln

Bajnai, David ORCID: 0000-0002-4053-5056, Guo, Weifu, Spoetl, Christoph, Coplen, Tyler B., Methner, Katharina, Loeffler, Niklas, Krsnik, Emilija, Gischler, Eberhard, Hansen, Maximilian, Henkel, Daniela, Price, Gregory D., Raddatz, Jacek, Scholz, Denis and Fiebig, Jens (2020). Dual clumped isotope thermometry resolves kinetic biases in carbonate formation temperatures. Nat. Commun., 11 (1). BERLIN: NATURE RESEARCH. ISSN 2041-1723

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Abstract

Surface temperature is a fundamental parameter of Earth's climate. Its evolution through time is commonly reconstructed using the oxygen isotope and the clumped isotope compositions of carbonate archives. However, reaction kinetics involved in the precipitation of carbonates can introduce inaccuracies in the derived temperatures. Here, we show that dual clumped isotope analyses, i.e., simultaneous (47) and (48) measurements on the single carbonate phase, can identify the origin and quantify the extent of these kinetic biases. Our results verify theoretical predictions and evidence that the isotopic disequilibrium commonly observed in speleothems and scleractinian coral skeletons is inherited from the dissolved inorganic carbon pool of their parent solutions. Further, we show that dual clumped isotope thermometry can achieve reliable palaeotemperature reconstructions, devoid of kinetic bias. Analysis of a belemnite rostrum implies that it precipitated near isotopic equilibrium and confirms the warmer-than-present temperatures during the Early Cretaceous at southern high latitudes. Some palaeotemperature proxies suffer from inaccuracies related to kinetic fractionations occurring during carbonate mineral growth. Here, the authors show that dual clumped isotope thermometry can identify the origin of these kinetic biases and allows for the reconstruction of accurate environmental temperatures.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bajnai, David UNSPECIFIED orcid.org/0000-0002-4053-5056 UNSPECIFIED Guo, Weifu UNSPECIFIED UNSPECIFIED UNSPECIFIED Spoetl, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Coplen, Tyler B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Methner, Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED Loeffler, Niklas UNSPECIFIED UNSPECIFIED UNSPECIFIED Krsnik, Emilija UNSPECIFIED UNSPECIFIED UNSPECIFIED Gischler, Eberhard UNSPECIFIED UNSPECIFIED UNSPECIFIED Hansen, Maximilian UNSPECIFIED UNSPECIFIED UNSPECIFIED Henkel, Daniela UNSPECIFIED UNSPECIFIED UNSPECIFIED Price, Gregory D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Raddatz, Jacek UNSPECIFIED UNSPECIFIED UNSPECIFIED Scholz, Denis UNSPECIFIED UNSPECIFIED UNSPECIFIED Fiebig, Jens UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-323562
DOI:	10.1038/s41467-020-17501-0
Journal or Publication Title:	Nat. Commun.
Volume:	11
Number:	1
Date:	2020
Publisher:	NATURE RESEARCH
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DEEP-SEA CORALS; BIOLOGICAL CARBONATES; CAVE SPELEOTHEMS; TRACE-ELEMENT; WATER CORALS; DEVILS HOLE; OXYGEN; FRACTIONATION; PALEOTEMPERATURES; BRACHIOPODS Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32356