Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6439245 | Geochimica et Cosmochimica Acta | 2012 | 18 Pages |
Abstract
The 9-yr time-series analysis indicated that roughly the lower half of the original event bed was preserved in the sediment record. Conversely, the upper half of the deposit experienced significant alterations including bioturbation, addition of new material, as well as coarsening. Comparison of the recently deposited material with 9-yr old preserved strata represented a unique natural laboratory to investigate the diagenesis of sedimentary OM in a non-steady system. Bulk data indicated that OC and TN were degraded at similar rates (loss â¼17%) whereas biomarkers exhibited a broad spectrum of reactivities (loss from â¼6% to â¼60%) indicating selective preservation during early diagenesis. Given the relevance of episodic sedimentation in several margins, this study has demonstrated the utility of event-response and time-series sampling of the seabed for understanding the early diagenesis in non-steady conditions.
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Authors
T. Tesi, L. Langone, M.A. Goñi, R.A. Wheatcroft, S. Miserocchi, L. Bertotti,