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Chalk is usually thought to be a homogeneous sediment with a relatively simple early diagenetic history. Here, clumped isotope analyses of samples from a core of Campanian Maastrichtian chalk are presented, indicating that material smaller than 5 µm has a different origin than the coccolith-dominated coarser fraction. The smallest size fraction (1...
The Cretaceous Earth, with its greenhouse climate and absence of major ice caps in the polar regions, represents an extreme scenario for modeling future warming. Despite considerable efforts, we are just at the verge of fully understanding the conditions of a warm Earth, and better, more extensive proxy evidence is needed to solve existing discrepa...
This study investigates the use of pyrite framboid data to increase insight in sea floor environmental conditions during deposition of chalk-marl cycles in the Upper Cretaceous of the Danish Basin, NW Europe. Framboid data have been used successfully to differentiate stages of oxygen reduction in siliciclastic mud rocks, and the data presented here...
The Chalk Group forms important hydrocarbon reservoirs offshore and water aquifers onshore Denmark. Within a day of fieldwork, a 450 m long reflection seismic profile was acquired onshore in an area in southeast Denmark, where the Chalk Group extends almost to the surface and is approximately 900 m thick. The main objective of the study was to imag...
The Chalk Group is of special interest because it contains groundwater aquifers onshore Denmark and hydrocarbon reservoirs in the North Sea. The Stevns peninsula, eastern Zealand offers a unique opportunity to study a reservoir analogue. Based on different data types from this area, we examine the influence of rock physical parameters linked to spe...
This work illustrates the evolution the Lower Jurassic shallow-water carbonates known as the Calcare Massiccio Formation in the Central Apennines (Italy). The Calcare Massiccio is characterized by lateral and vertical variability in the facies associations, related to an articulated physiography of the Triassic to Lower Jurassic carbonate platform...
This study integrates facies analysis, macrofossil distribution, borehole wireline gamma-logs, core scanning gamma logs as well as porosity and permeability core plug measurements. The aim is to establish a holostratigraphy and recognize established stratigraphic members within the 350 m core and compare the data with other shallow onshore wells within the Danish Basin