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Calcium-rich rhodochrosite layers in sediments of the Gotland Deep, Baltic Sea, as indicators for seawater inflow

Heiser, Uwe


The formation of Ca-rich rhodochrosites in sediments of the predominantly anoxic Gotland Deep, Baltic Sea, has been assumed to reflect deepwater oxygenation events caused by inflows of large volumes of North Sea water into the Baltic Sea. Such episodically occurring seawater inflows are a product of specific North European/North Atlantic atmospheric conditions. In this work, the formation conditions of sub-recent Ca-rich rhodochrosites was analysed for the first time in surficial sediments of the Gotland Deep. The stratigraphy of Ca-rich rhodochrosite layers was directly compared to recent oceanographic records and the isotopic composition of the carbonates was analysed. The solid phase composition was compared to the porewater composition in order to analyse thermodynamic equilibria. Furthermore, the distribution of trace elements in these sediments was analysed.

The hypothesis of a synsedimentary formation of Ca-rich rhodochrosite as a product of North Sea water inflows was confirmed in this study. However, dependent on hydrographic conditions, surface sediments can be re-suspended or eroded and authigenic carbonates can be re-dissolved in undersaturated bottomwaters. ... mehr

Zugehörige Institution(en) am KIT Fakultät für Bauingenieur-, Geo- und Umweltwissenschaften – Institut für Mineralogie und Geochemie (IMG)
Publikationstyp Hochschulschrift
Publikationsjahr 2000
Sprache Englisch
Identifikator ISSN: 0943-8599
KITopen-ID: 5362000
Verlag Universität Karlsruhe (TH)
Serie Karlsruher Geochemische Hefte ; 17
Art der Arbeit Dissertation
Fakultät Fakultät für Bio- und Geowissenschaften (Fak. f. Bio- u. Geowiss.)
Institut Fakultät für Bauingenieur-, Geo- und Umweltwissenschaften – Institut für Petrographie und Geochemie (Inst. f. Petrograph. u. Geochem.)
Prüfungsdaten 12.07.2000
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