Stable isotope and trace element geochemistry of Upper Cretaceous carbonates and belemnite rostra (Middle Campanian, north Germany)

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: NIebuhr S, Joachimski M
Zeitschrift: Geobios
Verlag: Elsevier Masson
Jahr der Veröffentlichung: 2002
Band: 35
Heftnummer: 1
Seitenbereich: 51-64
ISSN: 0016-6995


Abstract


Trace element contents and stable isotopic composition of Middle Campanian marl-limestone rhythmites and belemnite rostra of Belemnitella mucronata were investigated. High strontium and low iron as well as manganese and magnesium contents of belemnite calcite and bulk rock samples suggest no diagenetic overprint. However, the orange-coloured cathodoluminescence of coccolith-rich sediments indicates diagenetic cementation and/or recrystallization. The non-luminescent belemnite rostra reveal an extraordinary preservation of the microstructures that is interpreted to have been favoured by a silification of the outer rim of the belemnite rostra. Carbon isotope ratios of the coccolith limestones and belemnite rostra are comparable, with higher δC variations observed for belemnite calcite. The 1.5-2‰ depletion in δO of the marl-limestone rhythmites relative to belemnite calcite is explained by diagenetic alteration of the sediments. Palaeotemperatures, calculated from the δO values of the well-preserved belemnite rostra, are around 12.5 ± 2 °C and suggest rather low sea-surface temperatures for the Middle Campanian epicontinental sea of north Germany assuming a water depth of less than 100 m. © 2002 Éditions scientifiques et médicales Elsevier SAS. All rights reserved.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Joachimski, Michael Prof. Dr.
Lehrstuhl für Geologie (Exogene Dynamik)


Zitierweisen

APA:
NIebuhr, S., & Joachimski, M. (2002). Stable isotope and trace element geochemistry of Upper Cretaceous carbonates and belemnite rostra (Middle Campanian, north Germany). Geobios, 35(1), 51-64. https://dx.doi.org/10.1016/S0016-6995(02)00009-8

MLA:
NIebuhr, Sara, and Michael Joachimski. "Stable isotope and trace element geochemistry of Upper Cretaceous carbonates and belemnite rostra (Middle Campanian, north Germany)." Geobios 35.1 (2002): 51-64.

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