Major and minor element signatures of OC-rich Paleogene sediments from Lomonosov-Ridge (IODP Leg 302)
Final Report Abstract
The major findings of this project and their value for the broader understanding of the Arctic Ocean are: • The organic-rich, biosiliceous Eocene sediments recovered from the Arctic Lomonosov Ridge can be classified as black shale-type deposits, geochemically and genetically comparable to e.g. Cretaceous black shales from lowlatitude settings. • Probably the closest modern analogues of this Arctic depositional setting are deep anoxic basins of the Baltic Sea (e.g. Gotland Deep). • The accumulation of organic matter was most probably supported by a combination of elevated primary productivity, and enhanced preservation under anoxic to euxinic bottom water conditions. • Even under these conditions, the Arctic Ocean was never a completely isolated ocean basin over the last ~60 million years, but had at least shallow connections to the world ocean and was episodically flushed with welloxygenated water masses. • The high biogenic opal productivity may have been significantly influenced by an increased delivery of bio-available iron that originated from rivers and/or suboxic shelf sediments. • The timing and cause of the termination of Arctic black shale deposition remains dubious, but our data strongly suggest that several periods of very low sedimentation or even sediment erosion between the middle Eocene and middle Miocene erased parts of the Cenozoic sediment record. • The first onset of modern-type, oxic conditions in the central Arctic are marked by extreme positive Ce anomalies, to our knowledge the highest ever reported from marine sediments.
Publications
- (2008). A siliceous microfossil view of Middle Eocene Arctic paleoenvironments: a window of biosilica production and preservation. Palaeoceanography 23, PA1S14
Stickley CE, Koç N, Brumsack H-J, Jordan RW and Suto I
(See online at https://doi.org/10.1029/2007PA001485) - (2008). A ~25 Million years gap in the central Arctic record at the Greenhouse-Icehouse transition: Looking for clues. Palaeoceanography 23, PA1S04
Sangiorgi F, Brumsack H-J, Willard DA, Brinkhuis H, Schouten S, Stickley CE, O'Regan M, Reichart G-J and Sinninghe Damste J
(See online at https://doi.org/10.1029/2007PA001477) - (2008). Arctic late Paleocene – Early Eocene paleoenvironments with special emphasis on the Paleocene – Eocene thermal maximum (Lomonosov Ridge, Integrated Ocean Drilling Program Expedition 302). Palaeoceanography 23, PA1S11
Sluijs A, Röhl U, Schouten S, Brumsack H-J, Sangiorgi F, Sinninghe Damsté J and Brinkhuis H
(See online at https://doi.org/10.1029/2007PA001495) - (2008). Mid-Cenozoic Tectonic and Paleoenvironmental Setting of the Central Arctic Ocean. Palaeoceanography 23, PA1S20
O’Regan M, Moran K, Backman J, Jakobsson M, Sangiorgi F, Brinkhuis H, Pockalny R, Skelton A, Stickley C, Koc N, Brumsack H-J and Willard D
(See online at https://doi.org/10.1029/2007PA001559) - (2008). Surface water productivity and paleoceanographic implications in the Cenozoic Arctic Ocean. Palaeoceanography 23, PA1S16
Knies J, Mann U, Popp B, Stein R and Brumsack H-J
(See online at https://doi.org/10.1029/2007PA001455) - Geochemical cycles in Arctic marine sediments - Climate signals or diagenesis? NSG/EUROPROX Symposium, Utrecht, 28.11.2008
C. März, B. Schnetger, H.-J. Brumsack
- Inorganic geochemistry of Arctic (Plio-Pleistocene) sediments - From Lomonosov Ridge to Bering Sea. Geochimica Actie (Geochemical Seminar), Utrecht University, 04.06.2009
C. März, B. Schnetger, H.-J. Brumsack
- Major and minor element signatures and their paleoenvironmental significance in Central Arctic Ocean sediments (Lomonosov Ridge, IODP Leg 320). IODP/ICDP Kolloquium, Potsdam, 16.-18.03.2009
C. März, B. Schnetger, H.-J. Brumsack
- Manganese cycles in Arctic Ocean sediments - Climate signals or diagenesis? European Geosciences Union (EGU) General Assembly, Vienna, 19.-25.04.2009
C. März, A. Stratmann, S. Eckert, B. Schnetger, H.-J. Brumsack
- (2010). Paleoenvironmental implications of Cenozoic sediments from the Central Arctic Ocean (IODP Expedition 302) using inorganic geochemistry. Paleoceanography 25, PA3206
März C, Schnetger B and Brumsack H-J
(See online at https://doi.org/10.1029/2009PA001860) - Arctic Ocean circulation during the anoxic Eocene Azolla event. European Geosciences Union (EGU) General Assembly, Vienna, 02.-07.05.2010
E.N. Speelman, J.S. Sinninghe Damsté, C. März, H.-J. Brumsack, G.-J. Reichart
- What can inorganic geochemical records tell us about the history of the Arctic Ocean? UK Polar Network, Polar sedimentary processes and archives workshop, Loughborough, 18.-19.11.2010
C. März, B. Schnetger, H.-J. Brumsack
- (2011). Das Marine Sediment als Gedächtnis des Klimas (The marine sediments as long-term climate archive). In: J. Lozán (Ed.) Warnsignale Klima: Die Meere - Änderungen und Risiken
März C, Böning P and Brumsack H-J
- (2011). Variable Eocene-Miocene sedimentation processes and bottom water redox conditions in the Central Arctic Ocean (IODP Expedition 302). Earth Planet. Sci Lett. 310, 526-537
März C, Vogt C, Schnetger B and Brumsack H-J
- Complex sedimentation processes and bottom water redox conditions across the Eocene-Miocene “hiatus” in the Central Arctic Ocean (IODP Expedition 302). IODP/ICDP Kolloquium, Münster, 14.-16.03.2011
C. März, C. Vogt, B. Schnetger, H.-J. Brumsack
- The geochemical signature of Paleogene "Black Shale" deposition and its termination in the central Arctic Ocean (IODP Expedition 302). Cretaceous-Paleogene palaeoenvironments, tectonics and biostratigraphy of the Arctic and subarctic, Tromsö, 29.-30.03.2011
C. März, C. Vogt, B. Schnetger, H.-J. Brumsack
