10.6084/m9.figshare.3452969.v1
OLIVER FRIEDRICH
OLIVER
FRIEDRICH
SILKE VOIGT
SILKE
VOIGT
TANJA KUHNT
TANJA
KUHNT
MIRJAM C. KOCH
MIRJAM C.
KOCH
Repeated bottom-water oxygenation during OAE 2: timing and duration of short-lived benthic foraminiferal repopulation events
(Wunstorf, northern Germany)
Geological Society of London
2016
oxygenation
benthic foraminiferal repopulation events
Oceanic Anoxic Event 2
Wunstorf
repopulation events
NW
interval
concentration
OAE 1 b
OAE 2
benthic foraminiferal assemblage data
benthic foraminiferal assemblage records
anoxic
Geology
2016-06-21 11:01:23
Dataset
https://geolsoc.figshare.com/articles/dataset/Repeated_bottom-water_oxygenation_during_OAE_2_timing_and_duration_of_short-lived_benthic_foraminiferal_repopulation_events___Wunstorf_northern_Germany_/3452969
<p>Published proxy data for Oceanic Anoxic Event 2 (OAE 2 or Cenomanian–Turonian Boundary Event) and other mid-Cretaceous OAEs
indicate widespread anoxic bottom-water conditions. However, increasing evidence shows that anoxia was not permanent but subject
to significant fluctuations. We have generated X-ray fluorescence elemental concentration and benthic foraminiferal assemblage
records for a short section of OAE 2 black shales from Wunstorf, northern Germany. Two intervals of low sulphur elemental
concentration are interpreted as periods of increased oxygenation of bottom waters. This is supported by benthic foraminiferal
assemblage data showing repopulation events associated with these intervals. These repopulation events are characterized mainly
by the occurrence of agglutinated taxa, with <em>Lingulogavelinella globosa</em> being the only abundant calcareous species. This observation is interpreted in terms of short-term interruptions of the otherwise
anoxic bottom-water environment. Comparison with repopulation events during OAE 1b and Quaternary sapropels make it reasonable
to speculate that short-term cooling and an associated increase in bottom-water ventilation at the NW European shelf sea are
the main trigger mechanisms for the observed repopulation events at Wunstorf. As source area for benthic foraminifera, shallower
parts of the Lower Saxony basin are proposed.
</p>