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  4. Development and controls of the final Cretaceous black-shale event, Coniacian to lower Campanian (OAE 3):A reference section from the tropical Atlantic at Milankovitch time-scales
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-diss000102356

Development and controls of the final Cretaceous black-shale event, Coniacian to lower Campanian (OAE 3):A reference section from the tropical Atlantic at Milankovitch time-scales

Veröffentlichungsdatum
2005-11-08
Autoren
Beckmann, Britta  
Betreuer
Wagner, Thomas  
Gutachter
Hinrichs, Kai-Uwe  
Zusammenfassung
The study focuses on high-resolution investigation of marine sediments accumulated during the Coniacian-Campanian oceanic anoxic event 3 (OAE 3) to obtain a model of black shale formation in the equatorial Atlantic Ocean at ODP Site 959 off Ivory Coast. Selected geochemical parameters display cyclic fluctuations that are attributed to orbital forcing of Milankovitch frequency. Marine and continental geochemical proxy-data indicate two depositional modes defining boundary conditions for black shale accumulation and OC-lean sedimentation in relation to African climate across the OAE 3. Variable amplitudes in continental proxy records suggest climate contrasts alternating between arid and humid conditions. Continental runoff was identified as main trigger for productivity cycles, with extreme variations in redox-conditions across the water column. Simulations using a global climate model validated the assumption of freshwater discharge resulting in circulation reversal, the development of ocean anoxia and finally black shale deposition. Results from this study support a highly dynamic climate-ocean system during the Upper Cretaceous.
Schlagwörter
oceanic anoxic event

; 

OAE 3

; 

black shale

; 

ODP Site 959

; 

paleoclimate
Institution
Universität Bremen  
Fachbereich
Fachbereich 05: Geowissenschaften (FB 05)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

00010235.pdf

Size

16.25 MB

Format

Adobe PDF

Checksum

(MD5):8a6205f1c67b41333e4e500902054f3c

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