TY - JOUR
T1 - Correlation of carbon isotope events in the Danish Upper Cretaceous chalk
AU - Schovsbo, Niels H.
AU - Rasmussen, Susanne Lil
AU - Sheldon, Emma
AU - Stemmerik, Lars
PY - 2008/7/10
Y1 - 2008/7/10
N2 - A high resolution carbon isotope (δ13C) profile through the
upper Campanian to Maastrichtian chalk was recently completed based on
material from the Stevns-1 core from the Stevns peninsula, eastern
Denmark. The δ13C variation of marine carbonates essentially
reflects global perturbations in the carbon cycle, i.e. the burial
fluxes of carbonate carbon versus organic carbon. It is widely observed
that the δ13C variation broadly tracks the eustatic sea-level curve, and that δ13C curves can be used for stratigraphic correlation (e.g. Jarvis et al.
2002). In the Stevns-1 core, a total of 29 notable isotope changes have
been identified in the upper Cam panian to Maastrichtian succession. In
order to evaluate the stratigraphic significance of the isotope
changes, the variation in δ13C values of the
mid-Maastrichtian chalk from cores in eastern Denmark and the Danish
North Sea, and from outcrops at Rørdal, northern Jylland has been
examined (Fig. 1). The selected interval is characterised by distinct
chalk and marl cycles in the Stevns-1 and Karlslunde-1 cores and in the
Rørdal quarry (Fig. 2), whereas a non-cyclic clean chalk is found in the
M-10X well from the North Sea. In the Rørdal quarry, the chalk–marl
unit spans the upper–lower Maastrichtian boundary in the Boreal
brachiopod and belemnite stratigraphies (Surlyk 1984; unpublished data,
B. Lauridsen & F. Surlyk). In Stevns-1 and Karlslunde-1 the
chalk–marl unit was deposited during the younger part of nannofossil
subzone UC20b (Sheldon 2006, in press). This paper presents preliminary
results of a high-resolution study of carbon isotopes, carried out by
the Geological Survey of Denmark and Greenland (GEUS) in co-operation
with partners from the Department of Geography and Geology at the
University of Copenhagen. This paper is a product of the Cretaceous
Research Centre (CRC) at Geo center Denmark.
AB - A high resolution carbon isotope (δ13C) profile through the
upper Campanian to Maastrichtian chalk was recently completed based on
material from the Stevns-1 core from the Stevns peninsula, eastern
Denmark. The δ13C variation of marine carbonates essentially
reflects global perturbations in the carbon cycle, i.e. the burial
fluxes of carbonate carbon versus organic carbon. It is widely observed
that the δ13C variation broadly tracks the eustatic sea-level curve, and that δ13C curves can be used for stratigraphic correlation (e.g. Jarvis et al.
2002). In the Stevns-1 core, a total of 29 notable isotope changes have
been identified in the upper Cam panian to Maastrichtian succession. In
order to evaluate the stratigraphic significance of the isotope
changes, the variation in δ13C values of the
mid-Maastrichtian chalk from cores in eastern Denmark and the Danish
North Sea, and from outcrops at Rørdal, northern Jylland has been
examined (Fig. 1). The selected interval is characterised by distinct
chalk and marl cycles in the Stevns-1 and Karlslunde-1 cores and in the
Rørdal quarry (Fig. 2), whereas a non-cyclic clean chalk is found in the
M-10X well from the North Sea. In the Rørdal quarry, the chalk–marl
unit spans the upper–lower Maastrichtian boundary in the Boreal
brachiopod and belemnite stratigraphies (Surlyk 1984; unpublished data,
B. Lauridsen & F. Surlyk). In Stevns-1 and Karlslunde-1 the
chalk–marl unit was deposited during the younger part of nannofossil
subzone UC20b (Sheldon 2006, in press). This paper presents preliminary
results of a high-resolution study of carbon isotopes, carried out by
the Geological Survey of Denmark and Greenland (GEUS) in co-operation
with partners from the Department of Geography and Geology at the
University of Copenhagen. This paper is a product of the Cretaceous
Research Centre (CRC) at Geo center Denmark.
UR - http://www.scopus.com/inward/record.url?scp=54749113197&partnerID=8YFLogxK
U2 - 10.34194/geusb.v15.5032
DO - 10.34194/geusb.v15.5032
M3 - Article
SN - 2597-2154
SN - 1904-4666
SN - 1604-8156
VL - 15
SP - 13
EP - 16
JO - Geological Survey of Denmark and Greenland Bulletin
JF - Geological Survey of Denmark and Greenland Bulletin
ER -