Tectonically-triggered sediment and carbon export to the Hadal zone.
作者： Negar Haghipour , Cameron McIntyre , Gerold Wefer , Timothy I. Eglinton , Rui Bao
DOI: 10.1038/S41467-017-02504-1
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摘要: 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 bulk organic (OC) its thermal decomposition fractions produced by ramped pyrolysis/oxidation for a core retrieved from the >7.5 km-deep Japan Trench. High-resolution measurements, coupled with distinctive thermogram characteristics OC, reveal hemipelagic sedimentation interrupted episodic deposition pre-aged OC trench. Low δ13C values diverse ages imply that latter material originates adjacent margin, co-occurrence intervals corresponding to known events implies tectonically triggered, gravity-flow-driven supply. We show can yield valuable chronological constraints sedimentary sequences. Our findings shed new light links between driven sedimentological processes marine cycling, implications dynamics hadal environments.
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