Proxy records for iron, sulfur and nitrogen cycling in the Tarfaya upwelling system ...
Oceanic Anoxic Events (OAEs) in Earth's history are regarded as analogues for current and future ocean deoxygenation, potentially providing information on its pacing and internal dynamics. In order to predict the Earth system's response to changes in greenhouse gas concentrations and radia...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
2019
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| Online Access: | https://dx.doi.org/10.1594/pangaea.906320 https://doi.pangaea.de/10.1594/PANGAEA.906320 |
| Summary: | Oceanic Anoxic Events (OAEs) in Earth's history are regarded as analogues for current and future ocean deoxygenation, potentially providing information on its pacing and internal dynamics. In order to predict the Earth system's response to changes in greenhouse gas concentrations and radiative forcing, a sound understanding of how biogeochemical cycling differs in modern and ancient marine environments is required. Here, we report proxy records for iron (Fe), sulfur and nitrogen cycling in the Tarfaya upwelling system in the Cretaceous Proto-North Atlantic before, during and after OAE2 (∼93 Ma). We apply a novel quantitative approach to sedimentary Fe speciation, which takes into account the influence of terrigenous weathering and sedimentation as well as authigenic Fe (non-terrigenous, precipitated onsite) rain rates on Fe-based paleo-redox proxies. Generally elevated ratios of reactive Fe (i.e., bound to oxide, carbonate and sulfide minerals) to total Fe (FeHR/FeT) throughout the 5 million year record are ... : Supplement to: Scholz, Florian; Beil, Sebastian; Flögel, Sascha; Lehmann, Moritz F; Holbourn, Ann E; Wallmann, Klaus; Kuhnt, Wolfgang (2019): Oxygen minimum zone-type biogeochemical cycling in the Cenomanian-Turonian Proto-North Atlantic across Oceanic Anoxic Event 2. Earth and Planetary Science Letters, 517, 50-60 ... |
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