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Early Eocene volcanic ashes on Greifswalder Oie and their depositional environment, with an overview of coeval ash-bearing deposits in northern Germany and Denmark

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Abstract

Unconsolidated bentonites and carbonate-cemented volcanic ashes occur in northern Germany within the clay sequence of the Lamstedt and Schlieven Formations documented by several wells. Ash-bearing carbonate concretions (so-called cementstones) are also known from glacially transported rafts and erratic boulders on the Baltic Sea island Greifswalder Oie, representing the easternmost exposures of early Eocene sediments in the North Sea Basin. The ashes can be correlated with water-lain ashes of the Danish Fur and Ølst Formations (mo-clay) generated during the opening of the North Atlantic Ocean about 55 Ma ago. Two types of cementstones can be distinguished on the basis of the mineralogical composition, sedimentary features and fossil content. Greifswalder Oie type I contains a black, up to 12-cm-thick ash deposit that follows above two distinct thin grey ash layers. The major ash unit has a rather homogeneous lower part; only a very weak normal grading and faint lamination are discernible. In the upper part, however, intercalations with light mudstone, in part intensively bioturbated, together with parallel and cross-lamination suggest reworking of the ash in a shallow marine environment. Major and trace element compositions are used to correlate type I ashes with those of the Danish-positive series which represent rather uniform ferrobasalts of the Danish stage 4, probably related to the emergence of proto-Iceland. In contrast, type II ash comprises a single, normally graded, about 5-cm-thick layer of water-lain air-fall tuff, which is embedded in fine-grained sandstone to muddy siltstone. Type II ash is characterised by very high TiO2 but low MgO contents. Exceptional REE patterns with a pronounced positive Eu anomaly suggest intense leaching of the glass that hampers exact correlation with pyroclastic deposits within the North Atlantic Igneous Province.

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Acknowledgments

The manuscript has much benefitted by profound and critical advices of Lotte Melchior Larsen (GEUS Copenhagen) and useful comments by Lutz Reinhardt (BGR Hannover), who both reviewed the paper. We thank Christina Lang (University of Greifswald), Hans Lorenz and Frank Korte (BGR Hannover) for sample preparation and processing the RFA and ICP-MS analyses. Manfred Ruppel (Goethe University Frankfurt), Bärbel Nülken and Manfred Zander (University of Greifswald) gave SEM technical support. Mathias Mähler (Verein Jordsand e.V.), head of the bird’s watching station at Greifswalder Oie, is thanked for his hospitality and friendship during our visits to the island.

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Obst, K., Ansorge, J., Matting, S. et al. Early Eocene volcanic ashes on Greifswalder Oie and their depositional environment, with an overview of coeval ash-bearing deposits in northern Germany and Denmark. Int J Earth Sci (Geol Rundsch) 104, 2179–2212 (2015). https://doi.org/10.1007/s00531-015-1203-1

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