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      Tectonically-triggered sediment and carbon export to the Hadal zone

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          Abstract

          Sediments in deep ocean trenches may contain crucial information on past earthquake history and constitute important sites of carbon burial. Here we present 14C data on bulk organic carbon (OC) and its thermal decomposition fractions produced by ramped pyrolysis/oxidation for a core retrieved from the >7.5 km-deep Japan Trench. High-resolution 14C measurements, coupled with distinctive thermogram characteristics of OC, reveal hemipelagic sedimentation interrupted by episodic deposition of pre-aged OC in the trench. Low δ 13C values and diverse 14C ages of thermal fractions imply that the latter material originates from the adjacent margin, and the co-occurrence of pre-aged OC with intervals corresponding to known earthquake events implies tectonically triggered, gravity-flow-driven supply. We show that 14C ages of thermal fractions can yield valuable chronological constraints on sedimentary sequences. Our findings shed new light on links between tectonically driven sedimentological processes and marine carbon cycling, with implications for carbon dynamics in hadal environments.

          Abstract

          Within sediments in deep ocean trenches an earthquake record may be observed. Here, the authors present 14C data on bulk organic carbon (OC) and thermal decomposition from a sediment core in the Japan Trench and match OC values with known earthquake events.

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          Sedimentary organic matter preservation: an assessment and speculative synthesis

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            Mineral control of soil organic carbon storage and turnover

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              Controls on tectonic accretion versus erosion in subduction zones: Implications for the origin and recycling of the continental crust

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                Author and article information

                Contributors
                rui.bao@erdw.ethz.ch
                Michael.Strasser@uibk.ac.at
                timothy.eglinton@erdw.ethz.ch
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                9 January 2018
                9 January 2018
                2018
                : 9
                : 121
                Affiliations
                [1 ]ISNI 0000 0001 2156 2780, GRID grid.5801.c, Geological Institute, , ETH Zurich, ; 8092 Zurich, Switzerland
                [2 ]ISNI 0000 0004 0504 7510, GRID grid.56466.37, National Ocean Science Accelerator Mass Spectrometry Facility, , Woods Hole Oceanographic Institute, ; Woods Hole, MA 02543-1539 USA
                [3 ]ISNI 0000 0001 2151 8122, GRID grid.5771.4, Institute of Geology, , University of Innsbruck, ; 6020 Innsbruck, Austria
                [4 ]ISNI 0000 0001 2297 4381, GRID grid.7704.4, MARUM-Center for Marine Environmental Sciences University of Bremen, ; D-28359 Bremen, Germany
                [5 ]ISNI 0000 0001 2156 2780, GRID grid.5801.c, Laboratory for Ion Beam Physics, Department of Physics, , ETH Zurich, ; 8093 Zurich, Switzerland
                [6 ]ISNI 0000 0000 9762 0345, GRID grid.224137.1, Scottish Universities Environmental Research Centre, ; Glasgow, G75 0QF UK
                [7 ]ISNI 000000041936754X, GRID grid.38142.3c, Present Address: Department of Earth and Planetary Sciences, , Harvard University, ; Cambridge, MA 02138 USA
                Author information
                http://orcid.org/0000-0003-3991-2405
                http://orcid.org/0000-0001-8517-9836
                Article
                2504
                10.1038/s41467-017-02504-1
                5760703
                29317639
                3a4bad3c-95a7-4bcd-901a-e735b83a6398
                © The Author(s) 2017

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 23 December 2016
                : 5 December 2017
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