Experimental calibration of clumped isotopes in siderite between 8.5 and 62 °C and its application as paleo-thermometer in paleosols

van Dijk, Joep; Fernandez, Alvaro; Storck, Julian-Christopher; White, Timothy; Lever, Mark; Müller, Inigo Andreas; Bishop, Stewart; Seifert, Reto; Driese, Steven; Krylov, Alexey; Ludvigson, Gregory; Turchyn, Alexandra; Lin, Chin Yik; Wittkop, Chad; Bernasconi, Stefano (2019). Experimental calibration of clumped isotopes in siderite between 8.5 and 62 °C and its application as paleo-thermometer in paleosols. Geochimica et cosmochimica acta, 254, pp. 1-20. Elsevier Science 10.1016/j.gca.2019.03.018

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The clumped isotope composition of carbonates can be directly related to their formation temperature in the environment, but a robust temperature calibration for siderite is still lacking, and thus limits the applicability of this tool. Here, we present a new calibration for the clumped isotope composition of siderites precipitated with two different techniques between 8.5 and 62 °C:

The slope of our calibration obtained at an acid digestion temperature of 115 °C is statistically indistinguishable from recently published calcite and dolomite clumped isotope calibrations. The intercept differs from calcite at phosphoric acid digestion temperatures of 70 and 115 °C due to a difference in phosphoric acid fractionation, highlighting the necessity of a siderite specific calibration.

We performed the first survey of the clumped isotope compositions of siderites from different environmental settings at ambient temperatures including two permanently waterlogged swamp sites as modern analogues for pedogenic siderite formation in the geologic record. We conclude that pedogenic siderites form at temperatures between the Mean Annual Air Temperature (MAAT) and the summer air temperature highlighting the strong potential of siderites for paleoclimate reconstructions in continental environments.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Storck, Julian-Christopher

Subjects:

500 Science > 550 Earth sciences & geology
500 Science > 560 Fossils & prehistoric life
500 Science > 570 Life sciences; biology
500 Science > 580 Plants (Botany)

ISSN:

0016-7037

Publisher:

Elsevier Science

Language:

English

Submitter:

Julian-Christopher Storck

Date Deposited:

19 Nov 2019 12:27

Last Modified:

19 Nov 2019 12:27

Publisher DOI:

10.1016/j.gca.2019.03.018

BORIS DOI:

10.7892/boris.135099

URI:

https://boris.unibe.ch/id/eprint/135099

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