Oligocene to Lower Pliocene deposits of the Norwegian continental shelf, Norwegian Sea, Svalbard, Denmark and their relation to the uplift of Fennoscandia: A synthesis

Eidvin, Tor; Riis, Fridtjof; Rasmussen, Erik S.

doi:10.1016/j.marpetgeo.2014.04.006

Cited by 63 publications

(170 citation statements)

References 56 publications

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“… (a) Simplified structural map of the North Viking Graben, northern North Sea, highlighting the major faults, the Horda and East Shetland Platform [after Holgate et al ., ], (b) quantitative X‐ray diffraction data of exploration well 35/10‐1, (c) quantitative X‐ray diffraction data of exploration well 35/11‐5 with simplified stratigraphic column [ NPD , ], and (d) geoseismic section illustrating the major faults and stratigraphic units. Note that there are several stratigraphic breaks in the Cenozoic [e.g., Løseth et al ., ; Eidvin et al ., ] that are not annotated on these stratigraphic columns.…”

Section: Methodsmentioning

confidence: 76%

Impact of silica diagenesis on the porosity of fine‐grained strata: An analysis of Cenozoic mudstones from the North Sea

Wrona

Taylor

Jackson

et al. 2017

Geochem Geophys Geosyst

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Silica diagenesis has the potential to drastically change the physical and fluid flow properties of its host strata and therefore plays a key role in the development of sedimentary basins. The specific processes involved in silica diagenesis are, however, still poorly explained by existing models. This knowledge gap is addressed by investigating the effect of silica diagenesis on the porosity of Cenozoic mudstones of the North Viking Graben, northern North Sea through a multiple linear regression analysis. First, we identify and quantify the mineralogy of these rocks by scanning electron microscopy and X‐ray diffraction, respectively. Mineral contents and host rock porosity data inferred from wireline data of two exploration wells are then analyzed by multiple linear regressions. This robust statistical analysis reveals that biogenic opal‐A is a significant control and authigenic opal‐CT is a minor influence on the porosity of these rocks. These results suggest that the initial porosity of siliceous mudstones increases with biogenic opal‐A production during deposition and that the porosity reduction during opal‐A/CT transformation results from opal‐A dissolution. These findings advance our understanding of compaction, dewatering, and lithification of siliceous sediments and rocks. Moreover, this study provides a recipe for the derivation of the key controls (e.g., composition) on a rock property (e.g., porosity) that can be applied to a variety of problems in rock physics.

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Section: Methodsmentioning

confidence: 76%

Impact of silica diagenesis on the porosity of fine‐grained strata: An analysis of Cenozoic mudstones from the North Sea

Wrona

Taylor

Jackson

et al. 2017

Geochem Geophys Geosyst

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“…In addition to a discolouration to yellow/orange colours, particularly reworked bisaccates showed a high degree of compression, a faint alveolar structure of airsacks and mineral imprints (de Vernal and Mudie, 1989a, b;Willard, 1996). Cenozoic uplift phases and shifting depocentres as documented in Eidvin et al (2014) are restricted to the basins off the Norwegian coast and should not have affected the coring site which is located on the Outer Vøring Plateau.…”

Section: Sample Preparation and Pollen Analysismentioning

confidence: 98%

Climate variability and long-term expansion of peatlands in Arctic Norway during the late Pliocene (ODP Site 642, Norwegian Sea)

et al. 2016

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Abstract.Little is known about the terrestrial response of high-latitude Scandinavian vegetation to the warmerthan-present climate of the late Pliocene (Piacenzian, 3.60-2.58 Ma). In order to assess Piacenzian terrestrial climate variability, we present the first high-resolution reconstruction of vegetation and climate change in northern Norway between 3.6 and 3.14 Ma. The reconstructions are derived from pollen assemblages in the marine sediments of ODP Hole 642B, Norwegian Sea (67 • N). The palynological assemblages provide a unique record of latitudinal and altitudinal shifting of the forest boundaries, with vegetation alternating between cool temperate forest during warmerthan-present intervals and boreal forest similar to today during cooler intervals. The northern boundary of the nemoral to boreonemoral forest zone was displaced at least 4-8 • further north, and warmest-month temperatures were 6-14.5 • C higher than at present during warm phases. Warm climatic conditions persisted during the earliest Piacenzian (ca. 3.6-3.47 Ma) with diverse cool temperate nemoral to boreonemoral forests growing in the lowlands of the Scandinavian mountains. A distinct cooling event at ca. 3.47 Ma resulted in a southward shift of vegetation zones, leading to the predominance of boreal forest and the development of open, low alpine environments. The cooling culminated around 3.3 Ma, coinciding with Marine Isotope Stage (MIS) M2. Warmer climate conditions returned after ca. 3.29 Ma, with higher climate variability indicated by the repeated expansion of forests and peatlands during warmer and cooler periods, respectively. Climate progressively cooled after 3.18 Ma, resembling climatic conditions during MIS M2. A high variability of Norwegian vegetation and climate changes during the Piacenzian is superimposed on a long-term cooling trend. This cooling was accompanied by an expansion of Sphagnum peatlands that potentially contributed to the decline in atmospheric CO 2 concentrations at the end of the Piacenzian warm period and facilitated ice growth through positive vegetation-snow albedo feedbacks. Correlations with other Northern Hemisphere vegetation records suggest hemisphere-wide effects of climate cooling.

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“…A number of rifted continental margins across the globe exhibit elevated coastal topography, complex sedimentary geometries and widespread volcanism implying continued tectonic activity in their ‘post‐rift’ stages (e.g. Chalmers, ; Eidvin, Riis, & Rasmussen, ; Hansen, ; Japsen, Green, & Chalmers, ; Riis, ; Rohrman & van der Beek, ), yet an underlying cause for tectonic rejuvenation is rarely evident. Onshore Cenozoic geology is seldom preserved; therefore, low temperature thermochronology has been widely employed to ascertain thermal histories, used to infer the denudational history of the landscape (Hendriks & Andriessen, ; Johannessen, Kohlmann, Ksienzyk, Dunkl, & Jacobs, ; Johnson & Gallagher, ; Wildman et al., ).…”

Section: Introductionmentioning

confidence: 99%

Evolution of the central West Greenland margin and the Nuussuaq Basin: Localised basin uplift along a stable continental margin proposed from thermochronological data

2018

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The Late Cenozoic is typically considered a time of widespread episodic tectonic uplift along the West Greenland continental margin (36-2 Ma), similar to other margins across the North Atlantic, such as Norway, East Greenland and the UK. The present study re-examines and remodels onshore thermochronological data from central West Greenland and the Cretaceous Nuussuaq Basin, utilising a Bayesian modelling approach and new concepts related to radiation damage within apatite. These new thermal histories indicate that slow-protracted cooling has occurred across the southern extent of the margin during the Mesozoic and Cenozoic, whereas those from within the Nuussuaq Basin display reheating through the Late Cretaceous/Palaeogene and cooling to present. Results suggest that no significant Late Cenozoic uplift has occurred along the southern margin, while cooling in the Nuussuaq Basin is consistent with events outlined in the basin's stratigraphy and implies uplift during volcanism and an isostatic response to the unroofing of the lithosphere has elevated the modern topography. These results imply significant tectonism in the region ceased by~45 Ma, yet have wider implications regarding how low temperature thermochronology data are treated and our understanding of the postrift evolution of passive margins. K E Y W O R D Smodelling, passive margins, stratigraphy, tectonics and sedimentation, thermochronology

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Oligocene to Lower Pliocene deposits of the Norwegian continental shelf, Norwegian Sea, Svalbard, Denmark and their relation to the uplift of Fennoscandia: A synthesis

Cited by 63 publications

References 56 publications

Impact of silica diagenesis on the porosity of fine‐grained strata: An analysis of Cenozoic mudstones from the North Sea

Impact of silica diagenesis on the porosity of fine‐grained strata: An analysis of Cenozoic mudstones from the North Sea

Climate variability and long-term expansion of peatlands in Arctic Norway during the late Pliocene (ODP Site 642, Norwegian Sea)

Evolution of the central West Greenland margin and the Nuussuaq Basin: Localised basin uplift along a stable continental margin proposed from thermochronological data

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