A mid-Cretaceous prograding sedimentary complex in the Sisimiut Basin, offshore West Greenland—stratigraphy and hydrocarbon potential

Gregersen, Ulrik; Skaarup, Nina

doi:10.1016/j.marpetgeo.2006.10.005

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…Reverse faulting was also observed in proximity to the Ikermiut Fault Zone (IFZ – Gregersen & Skaarup, ; Chalmers & Pulvertaft, ). In the IFZ reverse faulting in close association with folding affects the successions prior to the Middle Ypresian Horizon (Fig.…”

Section: Resultsmentioning

confidence: 99%

The role of pre‐existing structures during rifting, continental breakup and transform system development, offshore West Greenland

et al. 2017

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Continental breakup between Greenland and North America produced the small oceanic basins of the Labrador Sea and Baffin Bay, which are connected via the Davis Strait, a region mostly comprised of continental crust. This study contributes to the debate regarding the role of pre‐existing structures on rift development in this region using seismic reflection data from the Davis Strait data to produce a series of seismic surfaces, isochrons and a new offshore fault map from which three normal fault sets were identified as (i) NE‐SW, (ii) NNW‐SSE and (iii) NW‐SE. These results were then integrated with plate reconstructions and onshore structural data allowing us to build a two‐stage conceptual model for the offshore fault evolution in which basin formation was primarily controlled by rejuvenation of various types of pre‐existing structures. During the first phase of rifting between at least Chron 27 (ca. 62 Ma; Palaeocene), but potentially earlier, and Chron 24 (ca. 54 Ma; Eocene) faulting was primarily controlled by pre‐existing structures with oblique normal reactivation of both the NE‐SW and NW‐SE structural sets in addition to possible normal reactivation of the NNW‐SSE structural set. In the second rifting stage between Chron 24 (ca. 54 Ma; Eocene) and Chron 13 (ca. 35 Ma; Oligocene), the sinistral Ungava transform fault system developed due to the lateral offset between the Labrador Sea and Baffin Bay. This lateral offset was established in the first rift stage possibly due to the presence of the Nagssugtoqidian and Torngat terranes being less susceptible to rift propagation. Without the influence of pre‐existing structures the manifestation of deformation cannot be easily explained during either of the rifting phases. Although basement control diminished into the post‐rift, the syn‐rift basins from both rift stages continued to influence the location of sedimentation possibly due to differential compaction effects. Variable lithospheric strength through the rifting cycle may provide an explanation for the observed diminishing role of basement structures through time.

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Section: Resultsmentioning

confidence: 99%

The role of pre‐existing structures during rifting, continental breakup and transform system development, offshore West Greenland

et al. 2017

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“…The strait is a bathymetric high with water depths <700 m, while the water depth in the Baffin Bay and the Labrador Sea exceeds 2000 m. Prominent tectonic features of the Davis Strait are the Ungava Fault Complex and the Davis Strait High. A line of positive southwest-northeastward striking free-air gravity anomalies marks the location of the Ungava Fault Complex, a major transform fault (Funck et al 2007;Gregersen & Skaarup 2007;Gerlings et al 2009). In the centre of the strait, the Davis Strait High is character-ized by outcropping basement between 66 and 67 • N (Dalhoff et al 2006).…”

Section: Introductionmentioning

confidence: 98%

The Davis Strait crust—a transform margin between two oceanic basins

Suckro¹,

Gohl²,

Funck

et al. 2013

Geophysical Journal International

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The Davis Strait is located between Canada and Greenland and connects the Labrador Sea and the Baffin Bay basins. Both basins formed in Cretaceous to Eocene time and were connected by a transform fault system in the Davis Strait. Whether the crust in the central Davis Strait is oceanic or continental has been disputed. This information is needed to understand the evolution of this transform margin during the separation of the North American plate and Greenland. We here present a 315-km-long east-west-oriented profile that crosses the Davis Strait and two major transform fault systems-the Ungava Fault Complex and the Hudson Fracture Zone. By forward modelling of data from 12 ocean bottom seismographs, we develop a P-wave velocity model. We compare this model with a density model from ship-borne gravity data. Seismic reflection and magnetic anomaly data support and complement the interpretation. Most of the crust is covered by basalt flows that indicate extensive volcanism in the Davis Strait. While the upper crust is uniform, the middle and lower crust are characterized by higher P-wave velocities and densities at the location of the Ungava Fault Complex. Here, P-wave velocities of the middle crust are 6.6 km s −1 and of the lower crust are 7.1 km s −1 compared to 6.3 and 6.8 km s −1 outside this area; densities are 2850 and 3050 kg m −3 compared to 2800 and 2900 kg m −3. We here interpret a 45-km-long section as stretched and intruded crust or as new igneous crust that correlates with oceanic crust in the southern Davis Strait. A high-velocity lower crust (6.9-7.3 km s −1) indicates a high content of mafic material. This mantle-derived material gradually intruded the lower crust of the adjacent continental crust and can be related to the Iceland mantle plume. With plate kinematic modelling, we can demonstrate the importance of two transform fault systems in the Davis Strait: the Ungava Fault Complex with transpression and the Hudson Fracture Zone with pure strike-slip motion. We show that with recent poles of rotation, most of the relative motion between the North American plate and Greenland took place along the Hudson Fracture Zone.

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“…The numerous grabens and half-grabens mapped along this margin were filled with synrift facies that included potential petroleum source rocks and reservoir rocks. Sag-phase reservoirs of the passive margin include marginal marine to deep marine slope and fan sandstones of Cretaceous and Paleogene age others, 2000, 2006;Dalhoff and others, 2003;Gregersen and Skaarup, 2007 Figure 9. Total Petroleum System events chart for the Eurekan Structures Assessment Unit (ES AU in fig.…”

Section: Geologic Model For Assessmentmentioning

confidence: 99%

Geology and assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008

Schenk¹

2017

Professional Paper

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A mid-Cretaceous prograding sedimentary complex in the Sisimiut Basin, offshore West Greenland—stratigraphy and hydrocarbon potential

Cited by 11 publications

References 28 publications

The role of pre‐existing structures during rifting, continental breakup and transform system development, offshore West Greenland

The role of pre‐existing structures during rifting, continental breakup and transform system development, offshore West Greenland

The Davis Strait crust—a transform margin between two oceanic basins

Geology and assessment of undiscovered oil and gas resources of the West Greenland-East Canada Province, 2008

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