Carbon isotope geochemistry of the Cretaceous-Tertiary section of the Wasserfallgraben, Lattengebirge, southeast Germany

Details Carbon isotope geochemistry of the Cretaceous-Tertiary section of the Wasserfallgraben, Lattengebirge, southeast Germany Carbon isotope geochemistry of the Cretaceous-Tertiary section of the Wasserfallgraben, Lattengebirge, southeast Germany

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..75...50a&link_type=abstract

Earth and Planetary Science Letters, Volume 75, Issue 1, p. 50-58.

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Carbonates and organic matter in sediments of the Cretaceous-Tertiary (C/T) section of the Wasserfallgraben, Lattengebirge (Bavaria) have been investigated. All parameters-the carbonate content (Ccarb), its isotopic composition (δ13Ccarb, δ18Ocarb) as well as the organic carbon content (Corg), its isotopic composition (δ13Corg) and the H/C ratio of the sedimentary organic matter-display systematic variations across the C/T boundary which cannot be attributed to a single cause. The boundary zone as a whole is tectonically disturbed and shows significant features of detrital contaminations. Unidirectional shift in δ13Ccarb and δ13Corg are observed when directly comparing Maastrichtian (latest Cretaceous) and Danian (earliest Tertiary) sediments. These synchronous isotope displacements towards more negative readings are interpreted to reflect the reduced photosynthetic activity as consequence of the mass extinction at the C/T boundary. The results may have some bearings on other C/T profiles investigated where measurements on the reduced carbon species are still lacking.

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