2026-06-27T23:20:37Zhttp://doidb.wdc-terra.org/oaip/oai

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false4DOIDB.GFZ 10.5880/GFZ.3.3.2022.006 Frings, Patrick Patrick Frings 0000-0002-1012-0642 GFZ German Research Centre for Geosciences, Potsdam, Germany Tatzel, Michael Michael Tatzel 0000-0002-4001-2773 Georg-August-Universität Göttingen, Göttingen, Germany Oelze, Marcus Marcus Oelze 0000-0002-3950-6629 Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany GFZ Data Services 2022 Chert EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > DIAGENESIS EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > OXYGEN ISOTOPES EARTH SCIENCE > PALEOCLIMATE > PALEOCLIMATE RECONSTRUCTIONS > SEA SURFACE TEMPERATURE RECONSTRUCTION EARTH SCIENCE > SOLID EARTH > GEOTHERMAL DYNAMICS > GEOTHERMAL TEMPERATURE > TEMPERATURE GRADIENT Frings, Patrick Patrick Frings 0000-0002-1012-0642 GFZ German Research Centre for Geosciences, Potsdam, Germany Tatzel, Michael Michael Tatzel 0000-0002-4001-2773 Georg-August-Universität Göttingen, Göttingen, Germany Frings, Patrick GFZ German Research Centre for Geosciences 2022-12-15 2022-11-11 Model 10.1073/pnas.2213076119 1.0 MIT License / Copyright © 2022 Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences The ratio of 18O to 16O in cherts and other chemical sediments has increased by about 15‰ over geological time, but the cause of this increase is debated. Here, we provide a 1D sediment-column model designed to investigate the role of diagenesis, and specifically the heat flow through marine sediments, in setting the chert oxygen isotope ratios. The model simulates the transformation of amorphous silica (opal-A) to crystalline quartz via an intermediate phase by using a silicon mass balance that is driven by the kinetics and thermodynamics of silica phase dissolution and (re)precipitation. The model demonstrates that heat flow through marine sediments influences the rate, and therefore depths, temperatures, and oxygen isotope compositions, at which cherts form. The implication is that because global heat flow from the solid Earth has decreased through geological time, heat flow is an important contributing factor to the long-term trend in chert oxygen isotope composition.
The model is provided as a set of Matlab scripts (".m" files) and assorted input datasets provided as standard plain text files. The model is described in full in the manuscript "Chert oxygen isotope ratios are driven by Earth's thermal evolution" by Michael Tatzel, Patrick J. Frings, Marcus Oelze, Daniel Herwartz, Nils K. Lünsdorf, and Michael Wiedenbeck, and in the online Supporting Information associated with the manuscript. Once downloaded and unzipped, the files should be added to the local Matlab search path. The parameters of interest can be changed in the first few lines of 'chertKineticModel.m'. No other files need to be opened or modified. These files have been tested in Matlab R2020a running on Mac OS X 12.2.1 and in Matlab R2022b on Mac OS X 12.6.1.
Licence: MIT License (https://opensource.org/licenses/MIT)
Copyright © 2022 Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences

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