TY - JOUR
T1 - The lower Maastrichtian Hivdskud succession, Møns Klint, Denmark
T2 - calcareous nannofossil biostratigraphy, carbon isotope stratigraphy, and bulk and brachiopod oxygen isotopes
AU - Jelby, M.E.
AU - Thibault, Nicolas Rudolph
AU - Surlyk, Finn
AU - Ullmann, Clemens Vinzenz
AU - Harlou, Rikke
AU - Korte, Christoph
PY - 2014/11/28
Y1 - 2014/11/28
N2 - A new calcareous nannofossil and δ13C stratigraphy is established
for the chalk exposed in the lower Maastrichtian Hvidskud succession,
Møns Klint, Denmark. It is based on 21 nannofossil samples and analysis
of 82 stable isotope samples, allowing correlation with a previously
established brachiopod zonation.
The succession, which belongs to the brachiopod spinosa-subtilis
to pulchellus-pulchellus zones, extends upwards from calcareous
nannofossil subzone UC16ii to UC19ii and encompasses δ13C events M1+ to
M2+. A new chronostratigraphic and geochronological age model is
proposed based on correlation with the cored boreholes Stevns-1
(Denmark) and ODP Site 762C (Indian Ocean).
Hvidskud encompasses the 405 kyr eccentricity cycles Ma40513 –
Ma40511 within magnetochron C31r. A sedimentation rate of 5.0 cm kyr-1
can be inferred from correlation to geochronological tie-points in ODP
762C, suggesting an age of ~70.9 Ma for the base of the succession and a
duration of >680 kyr for the investigated interval. The Hvidskud
succession is well-exposed, easily accessible, and the new stratigraphic
framework and precise age model suggest that it can be used as a key
locality for stratigraphic correlation of the lower Maastrichtian in
north-western Europe. Information on palaeo-seawater temperatures can be
drawn from oxygen isotope records obtained from bulk rock samples and
24 micromorphic brachiopod specimens (Terebratulina faujasii).
The brachiopod data show a clear diagenetic trend but point to an
upper range of unaltered values between –0.4 and –0.6\\\\\\‰. Assuming a
δ18O value of –1\\\\\\‰ for seawater in a Cretaceous ice-free world,
this would indicate bottom water temperatures of 13.6 to 14.3°C of the
Danish Chalk Sea (45°N) during the early Maastrichtian cooling.
Basin, brachiopod zonation, oxygen isotopes, Hvidskud.
AB - A new calcareous nannofossil and δ13C stratigraphy is established
for the chalk exposed in the lower Maastrichtian Hvidskud succession,
Møns Klint, Denmark. It is based on 21 nannofossil samples and analysis
of 82 stable isotope samples, allowing correlation with a previously
established brachiopod zonation.
The succession, which belongs to the brachiopod spinosa-subtilis
to pulchellus-pulchellus zones, extends upwards from calcareous
nannofossil subzone UC16ii to UC19ii and encompasses δ13C events M1+ to
M2+. A new chronostratigraphic and geochronological age model is
proposed based on correlation with the cored boreholes Stevns-1
(Denmark) and ODP Site 762C (Indian Ocean).
Hvidskud encompasses the 405 kyr eccentricity cycles Ma40513 –
Ma40511 within magnetochron C31r. A sedimentation rate of 5.0 cm kyr-1
can be inferred from correlation to geochronological tie-points in ODP
762C, suggesting an age of ~70.9 Ma for the base of the succession and a
duration of >680 kyr for the investigated interval. The Hvidskud
succession is well-exposed, easily accessible, and the new stratigraphic
framework and precise age model suggest that it can be used as a key
locality for stratigraphic correlation of the lower Maastrichtian in
north-western Europe. Information on palaeo-seawater temperatures can be
drawn from oxygen isotope records obtained from bulk rock samples and
24 micromorphic brachiopod specimens (Terebratulina faujasii).
The brachiopod data show a clear diagenetic trend but point to an
upper range of unaltered values between –0.4 and –0.6\\\\\\‰. Assuming a
δ18O value of –1\\\\\\‰ for seawater in a Cretaceous ice-free world,
this would indicate bottom water temperatures of 13.6 to 14.3°C of the
Danish Chalk Sea (45°N) during the early Maastrichtian cooling.
Basin, brachiopod zonation, oxygen isotopes, Hvidskud.
M3 - Journal article
SN - 0011-6297
VL - 62
SP - 89
EP - 104
JO - Bulletin of the Geological Society of Denmark
JF - Bulletin of the Geological Society of Denmark
ER -