Controls on upper Campanian-Maastrichtian chalk deposition in the eastern Danish Basin
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Controls on upper Campanian-Maastrichtian chalk deposition in the eastern Danish Basin. / Boussaha, Myriam; Thibault, Nicolas Rudolph; Anderskouv, Kresten; Moreau, Julien; Stemmerik, Lars; Reijmer, John (Redaktør).
I: Sedimentology, Bind 64, Nr. 7, 2017, s. 1998-2030.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Controls on upper Campanian-Maastrichtian chalk deposition in the eastern Danish Basin
AU - Boussaha, Myriam
AU - Thibault, Nicolas Rudolph
AU - Anderskouv, Kresten
AU - Moreau, Julien
AU - Stemmerik, Lars
A2 - Reijmer, John
PY - 2017
Y1 - 2017
N2 - Detailed facies analysis of a 350 m long core of upper Campanian-Maastrichtian chalk at Stevns Peninsula, eastern Denmark, shows that four mudstone and wackestone chalk facies account for close to 95% of the succession, and that bioturbated mudstone chalk alone accounts for nearly 55% of the sediment. Sedimentation took place in deep water, below the photic zone and storm-wave base, and is characterized by decimetre to metre-scale variations in facies and trace fossil assemblages indicating repeated shifts in depositional environment. Integration of facies with published data on sea-surface temperature and accumulation rates suggests that sea-surface temperature is the most important parameter in controlling stratification of the water column and thereby, indirectly, the observed variations in depositional facies. However, bioturbated mudstone chalk occurs in all stratigraphic levels independent of accumulation rates and sea temperatures and is interpreted to represent a very broad set of deep water environmental conditions with an ample supply of calcareous nannofossil debris and intense bioturbation. Longer term shifts in deposition are best expressed by distribution of clay, flint and bioturbated micro-wackestone, bioturbated wackestone and laminated mudstone chalk facies, whereas the trace fossil assemblages appear less useful. The data set indicates overall shallowing over time with two distinctive events of clay influx to the basin during the late Campanian-earliest Maastrichtian and late Maastrichtian.
AB - Detailed facies analysis of a 350 m long core of upper Campanian-Maastrichtian chalk at Stevns Peninsula, eastern Denmark, shows that four mudstone and wackestone chalk facies account for close to 95% of the succession, and that bioturbated mudstone chalk alone accounts for nearly 55% of the sediment. Sedimentation took place in deep water, below the photic zone and storm-wave base, and is characterized by decimetre to metre-scale variations in facies and trace fossil assemblages indicating repeated shifts in depositional environment. Integration of facies with published data on sea-surface temperature and accumulation rates suggests that sea-surface temperature is the most important parameter in controlling stratification of the water column and thereby, indirectly, the observed variations in depositional facies. However, bioturbated mudstone chalk occurs in all stratigraphic levels independent of accumulation rates and sea temperatures and is interpreted to represent a very broad set of deep water environmental conditions with an ample supply of calcareous nannofossil debris and intense bioturbation. Longer term shifts in deposition are best expressed by distribution of clay, flint and bioturbated micro-wackestone, bioturbated wackestone and laminated mudstone chalk facies, whereas the trace fossil assemblages appear less useful. The data set indicates overall shallowing over time with two distinctive events of clay influx to the basin during the late Campanian-earliest Maastrichtian and late Maastrichtian.
KW - Campanian-Maastrichtian
KW - Chalk
KW - Depositional processes
KW - Facies
KW - Palaeoenvironment
U2 - 10.1111/sed.12386
DO - 10.1111/sed.12386
M3 - Journal article
AN - SCOPUS:85021790588
VL - 64
SP - 1998
EP - 2030
JO - Sedimentology
JF - Sedimentology
SN - 0037-0746
IS - 7
ER -
ID: 180993790