scholarly journals Depositional environments of Lower Cretaceous (Ryazanian– Barremian) sediments from Wollaston Forland and Kuhn Ø, North-East Greenland

2013 ◽  
Vol 61 ◽  
pp. 19-36 ◽  
Author(s):  
Sebastian Pauly ◽  
Jørg Mutterlose ◽  
Peter Alsen
Keyword(s):  
Lower Cretaceous ◽  
Late Jurassic ◽  
Stable Carbon Isotopes ◽  
Short Interval ◽  
First Record ◽  
Depositional Environments ◽  
Heavy Minerals ◽  
Mineral Contents ◽  
East Greenland ◽  
North East

Lower Cretaceous sediments from the Wollaston Forland–Kuhn Ø area in North-East Greenland have been analyzed for stable carbon isotopes, total organic carbon (TOC) content, and major and trace elements, aiming at a lithological characterization and reconstruction of the depositional environments. The marine sediments of Ryazanian–Barremian age were deposited in North-East Greenland directly after a major Late Jurassic – earliest Cretaceous rifting event. The Lower Cretaceous post-rift sediments are composed of fossiliferous calcareous mud- and marlstones assigned to the Albrechts Bugt (upper Ryazanian – Valanginian) and Rødryggen (Hauterivian) Members. The calcareous sediments are commonly sandwiched between black mudstones of Late Jurassic – earliest Cretaceous (Bernbjerg Formation) and mid Cretaceous (unnamed formation) age. The carbon isotope curves present the first record for the Lower Cretaceous (upper Ryazanian – Barremian) of North-East Greenland. The Ryazanian – Hauterivian sediments are characterized by a mixture of terrigenous detrital matter (quartz, clay minerals, heavy minerals) similar to average shale, with varying CaCO3 concentrations. The Barremian black mudstones on the contrary have lower CaCO3 and higher clay mineral contents. The deposition of the Bernbjerg Formation took place under anoxic bottom water conditions. The depositional environment of the Albrechts Bugt and Rødryggen Members is characterized by well-oxygenated sea-floor conditions, hemipelagic sedimentation of fine-grained terrigeneous detrital matter, and biogenic carbonate settling. After this relatively short interval of carbonate sedimentation under oxic conditions, bottom waters were affected by dysoxic conditions, responsible for the burial of organic matter in the Barremian.

scholarly journals Dinoflagellate cyst stratigraphy of the Barremian to Albian, Lower Cretaceous, North-East Greenland – a summary

1994 ◽  
Vol 160 ◽  
pp. 68-72
Author(s):  
H Nøhr-Hansen
Keyword(s):  
Lower Cretaceous ◽  
Geological Survey ◽  
Hydrocarbon Potential ◽  
Dinoflagellate Cysts ◽  
East Greenland ◽  
Dinoflagellate Cyst ◽  
North East

As part of studies of the onshore hydrocarbon potential in East Greenland undertaken by the Geological Survey of Greenland (GGU), a project was initiated with the purpose of describing the dinoflagellate cyst stratigraphy of the Lower Cretaceous succession in East Greenland (72°76°N) and correlating the exposed sections throughout the region (Nøhr-Hansen, 1993). Based on the rather sporadic occurrence of macrofossils the Lower Cretaceous sediments of East Greenland was previously dated as Aptian to Albian (Spath, 1946; Maync, 1949; Donovan, 1953, 1955, 1957). Maync (1949) reported the total exposed thickness of the ‘Aptian-Albian series’ to be more than 2000 m, whereas Surlyk (1990) noted that the Lower Cretaceous shale succession reached a cumulative thickness or 1000 m. Furthermore, Donovan (1972) reported that Hauterivian and Barremian sediments were unknown in East Greenland. Dinoflagellate cysts recorded from 40 sections throughout the region have now dated the Lower Cretaceous sequence as Barremian to Albian, and correlation of sections yields a cumulative thickness of approximately 1500m (Nøhr-Hansen, 1993).

First record ofOphthalmosaurus(Reptilia: Ichthyosauria) from the Tithonian (Upper Jurassic) of Mexico

2010 ◽  
Vol 84 (1) ◽  
pp. 149-155 ◽  
Author(s):  
Marie-Céline Buchy
Keyword(s):  
Middle Jurassic ◽  
Late Jurassic ◽  
Field Work ◽  
First Record ◽  
Upper Jurassic ◽  
Marine Transgression ◽  
North East ◽  
The Pacific ◽  
Invertebrate Assemblages ◽  
Marine Reptile

From the Middle Jurassic on, the Tethys basin opened westward; the existence of a Carribean corridor linking the European and Pacific realms now appears well supported by comparison of marine reptile assemblages (e.g., Gasparini and Fernández, 1997, 2005; Gasparini et al., 2000; Fernández and Iturralde-Vinent, 2000; Gasparini and Iturralde-Vinent, 2001, 2006; Gasparini et al., 2002). Marine transgression in Mexico began during the Callovian, as evidenced by the evaporites of the Minas Viejas Fm. However, microfossils and invertebrate assemblages indicate that the Mexican Gulf remained isolated from both the European Archipelago and the Pacific, at least temporarily, until the middle Berriasian; the Florida uplift and southward movement of Yucatan were proposed as possibly forming a barrier (Salvador et al., 1993; Adatte et al., 1994, 1996; Goldhammer, 1999; Goldhammer and Johnston, 2001; Gasparini and Iturralde-Vinent, 2006). After almost a decade of field work and examination of collections, the Late Jurassic marine reptile assemblage of north-east Mexico confirms the conclusions drawn from microfossils and invertebrates. Poorly diagnostic ichthyosaur remains, with various thalattosuchians, numerically dominate the assemblage. Sauropterygians are rare, mainly represented by large pliosaurids of unclear affinities, a few vertebrae attributed to elasmosaurids, and a unique cryptoclidid. Turtles are yet to be reported (Frey et al., 2002; Buchy et al., 2003, 2005b, 2006a–d; Buchy, 2007, 2008a, b; material currently under study).

scholarly journals Post-Caledonian sediments in North-East Greenland between 76° and 78°30'N

1990 ◽  
Vol 148 ◽  
pp. 123-126
Author(s):  
L Stemmerik ◽  
S Piasecki
Keyword(s):  
Lower Cretaceous ◽  
Middle Jurassic ◽  
East Greenland ◽  
Fine Grained ◽  
North East ◽  
Fine Grained Sand

Post-Caledonian sediments in North-East Greenland between 76° and 78° 30´N are, with the exception of an outlier near Kulhøj, restricted to Store Koldewey. The sediments on Store Koldewey, believed to span the Middle Jurassic to Lower Cretaceous (Callovian to Aptian), are dominated by fine-grained sand and silt. They contain a rich macrofauna which, together with material collected for microfloral investigations, will form the basis for a detailed stratigraphy and dating of the sequence.

scholarly journals Colophon, contents, preface

2018 ◽  
Vol 42 ◽  
Author(s):  
Jørgen A. Bojesen-Koefoed
Keyword(s):  
Lower Cretaceous ◽  
Direct Consequence ◽  
The United States ◽  
Upper Jurassic ◽  
Source Rocks ◽  
United States Geological Survey ◽  
East Greenland ◽  
North East ◽  
Industry Collaboration ◽  
Collaborative Agreement

This bulletin presents a series of nine papers dealing with the succession of Upper Jurassic – Lower Cretaceous sedimentary rocks penetrated by the fully cored Blokelv-1 borehole, drilled in western Jameson Land, central East Greenland in August 2008. The borehole was drilled as the first of three boreholes that in combination were designed to provide full coverage of the Upper Jurassic – Lower Cretaceous petroleum source-rock succession in eastern Greenland. The remaining two boreholes, Rødryggen-1 and Brorson Halvø-1, were drilled on Wollaston Forland in 2009 and 2010, respectively, and the results from these boreholes will be published in a companion volume. The objectives of the drilling campaign were fulfilled, demonstrating that continuous sedimentation of oil-prone petroleum source rocks took place in eastern Greenland over a period of c. 13 million years from the Oxfordian to the Ryazanian, with the Blokelv-1 succession representing the older, Oxfordian–Volgian part of this interval. The drilling campaign was carried out as one of a number of projects within the framework of a multi-client collaborative programme between GEUS and a long list of petroleum companies entitled Petroleum Geological Studies, Services and Data in East and Northeast Greenland. This collaboration was initiated in 2007 and is ongoing at the time of writing with more than 20 participant companies, a subset of which sponsored the studies presented herein; for contractual reasons, these companies cannot be named. The GEUS–industry collaboration was initiated in recognition of the need for new and better data on many aspects of the petroleum geology of eastern Greenland prior to an anticipated licensing round of offshore North-East Greenland. The Circum-Arctic Resource Appraisal (CARA), undertaken by the United States Geological Survey (USGS), also played an important role in defining the priorities of the collaborative agreement by directing attention towards specific subjects in need of investigation. Licensing rounds in 2012 and 2013 resulted in the award of five licences. Based on the results of these activities in eastern Greenland, a large number of scientific papers have been published since 2008, and more are expected as confidentiality clauses expire. This volume is, however, the first GEUS Bulletin to be published as a direct consequence of the GEUS–industry collaboration.

scholarly journals The stratigraphy of the Upper Jurassic and Lower Cretaceous sediments of Milne Land, central East Greenland

1984 ◽  
Vol 147 ◽  
pp. 1-56
Author(s):  
T Birkelund ◽  
J.H Callomon ◽  
F.T Fürsich
Keyword(s):  
Great Britain ◽  
Lower Cretaceous ◽  
Tectonic Evolution ◽  
Upper Jurassic ◽  
Depositional Environments ◽  
Land Area ◽  
Important Species ◽  
East Greenland ◽  
Northern Russia ◽  
Upper Callovian

The upper part of the jurassic to Lower Cretaceous succession of Milne Land, described in the present paper, represents an unusually complete, highly fossiliferous sequence of Kimmeridgian, Lower and Middle Volgian and poorly fossiliferous ?Lower Valanginian to Hauterivian deposits. On the basis of some 50 recorded sections the succession is described with respect to lithology and fossil content and placed within a lithostratigraphical frarnework. The Upper Callovian – Middle Volgian Kap Leslie Formation (overlying the Charcot Bugt Formation) is divided into eight members, the upper four of which are described in detail (Gråkløft Member, Krebsedal Member, Pernaryggen Member and Astartedal Member), while the Middle Volgian – Hauterivian Hartz Fjeld Formation above is divided into two members (Hennigryggen Member and Pinnadal Member). A succession of 34 ammonite faunas has been recorded from the Kimmeridgian to Middle Volgian succession of the area. The Kimmeridgian to Lower Volgian faunas match British faunas so closely that the standard zonation of Great Britain can be used. The 17 faunas of the Middle Volgian are closer to successions of northern Russia and Siberia, and the succession has been made the basis of a new regional zonation of nine standard zones for the Boreal Province. One Lower Cretaceous ammonite fauna has been recorded, having ?Early Valanginian age and uncertain affinities. The faunal horizons of Volgian ammonites from Milne Land figured by Spath (1936) in his classical monograph have been determined. Stratigraphically important species found since then have been described elsewhere (Callomon & Birkelund, 1982). The three main areas of outcrops, the Hartz Fjeld area, the Kronen area and the Bays Fjelde area, are correlated in detail on the basis of ammonite occurrences. The depositional environments and tectonic evolution of the Milne Land area are outlined. Some key sections of particular stratigraphical importance are described in an appendix.

Central- and North-East Greenland Rifted Margin Composite Tectono-Sedimentary Element, From Onshore East Greenland to the Greenland Sea

2021 ◽  
pp. M57-2017-15
Author(s):  
Michael B. W. Fyhn ◽  
Peter Alsen ◽  
Morten Bjerager ◽  
Jørgen A. Bojesen-Koefoed ◽  
Flemming G. Christiansen ◽  
...  
Keyword(s):  
Depositional Environments ◽  
Source Rocks ◽  
Rift System ◽  
East Atlantic ◽  
Petroleum Potential ◽  
East Greenland ◽  
North East ◽  
The North ◽  
Marine Sedimentation ◽  
Uplift And Erosion

AbstractThe Devonian to lower Eocene Central-East and NE Greenland Composite Tectono-Sedimentary Element CTSE) is a part of the North-East Atlantic rift system. East and NE Greenland geology is therefore analogues to that of the prolific basins on the conjugate Atlantic margin and in the North Sea in many respects. None the less, hydrocarbon discoveries remain. The presence of world-class source rocks, reservoirs and seals, together with large structures, may suggest an East and NE Greenland petroleum potential, however. The TSE was established through Devonian - Carboniferous, Permian - Triassic and Jurassic - Cretaceous rifting interspersed by periods of uplift and post-rift sagging. Subsequently, Paleocene - Eocene magma-rich rifting accompanied the North-East Atlantic break-up. Depositional environments through time varied in response to the changing tectonism and climate. None-marine deposition dominated until the end of the Triassic, only interrupted by marine sedimentation during Late Permian - Early Triassic times. Subsequently, marine conditions prevailed during the Jurassic and Cretaceous. Volumetric series of basalt erupted over most of the CTSE during the latest Paleocene - early Eocene following a significant latest Cretaceous - Paleocene regression, uplift and erosion event. Since the Eocene, denudation pulses have removed much of these basalts uniquely exposing the up to 17 km strata of the CTSE.

scholarly journals DinoflagelIate cyst stratigraphy of the Barremian to Albian, Lower Cretaceous, North-East Greenland

1993 ◽  
Vol 166 ◽  
pp. 1-171
Author(s):  
H Nøhr-Hansen
Keyword(s):  
Geographical Distribution ◽  
Early Cretaceous ◽  
Lower Cretaceous ◽  
East Greenland ◽  
North East

Stratigraphical ranges, geographical distribution and taxonomy of 176 dinoflagelIate cyst species are described based on analysis of 192 samples from 40 sections of Early Cretaceous age in North-East Greenland (72°-76° N).

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