Basin evolution and destruction in an Early Proterozoic continental margin: the Rinkian fold–thrust belt of central West Greenland

Grocott, John; McCaffrey, Ken

doi:10.1144/jgs2016-109

Cited by 34 publications

(20 citation statements)

References 29 publications

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“…b). The TO and NO belts are interpreted to have formed part of the same Paleoproterozoic passive margin prior to ocean closure and continental collision (Van Gool et al ., ; Grocott & McCaffrey, ). A continental collision model of formation is preferred over earlier interpretations of an intracontinental strike‐slip setting due to the presence of Paleoproterozoic calc‐alkaline dykes that are attributed to a subduction zone‐type setting (Korstgård et al ., ).…”

Section: Basement Terranes Of West Greenland and North‐eastern Canadamentioning

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: Basement Terranes Of West Greenland and North‐eastern Canadamentioning

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 morphology here is dominated by E-W trending, deeply incised fjords with 1 to 1.5 km high, steep, often nearly vertical cliffs. Rocks exposed along these cliffs are made up of Archean basement and Early Paleoproterozoic siliciclastic and carbonate sequences of the Karrat Group [46,47]. The Archean basement comprises leucocratic orthogneiss, deformed during multiple orogenic events [48].…”

Section: Study Area and Geological Settingmentioning

confidence: 99%

“…The Karrat Group sequence shows greenschist to amphibolite facies metamorphism [48]. The whole succession of Archean basement and Karrat Group meta-sediments was later overthrusted by Archean basement-cored nappes during the NW-SE directed compressional Rinkian event [46].…”

Section: Study Area and Geological Settingmentioning

confidence: 99%

Integration of Vessel-Based Hyperspectral Scanning and 3D-Photogrammetry for Mobile Mapping of Steep Coastal Cliffs in the Arctic

et al. 2018

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Abstract:Remote and extreme regions such as in the Arctic remain a challenging ground for geological mapping and mineral exploration. Coastal cliffs are often the only major well-exposed outcrops, but are mostly not observable by air/spaceborne nadir remote sensing sensors. Current outcrop mapping efforts rely on the interpretation of Terrestrial Laser Scanning and oblique photogrammetry, which have inadequate spectral resolution to allow for detection of subtle lithological differences. This study aims to integrate 3D-photogrammetry with vessel-based hyperspectral imaging to complement geological outcrop models with quantitative information regarding mineral variations and thus enables the differentiation of barren rocks from potential economic ore deposits. We propose an innovative workflow based on: (1) the correction of hyperspectral images by eliminating the distortion effects originating from the periodic movements of the vessel; (2) lithological mapping based on spectral information; and (3) accurate 3D integration of spectral products with photogrammetric terrain data. The method is tested using experimental data acquired from near-vertical cliff sections in two parts of Greenland, in Karrat (Central West) and Søndre Strømfjord (South West). Root-Mean-Square Error of (6.7, 8.4) pixels for Karrat and (3.9, 4.5) pixels for Søndre Strømfjord in X and Y directions demonstrate the geometric accuracy of final 3D products and allow a precise mapping of the targets identified using the hyperspectral data contents. This study highlights the potential of using other operational mobile platforms (e.g., unmanned systems) for regional mineral mapping based on horizontal viewing geometry and multi-source and multi-scale data fusion approaches.

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“…The West Greenland-Eastern Canada realm comprises multiple Archean and Proterozoic geological domains, reflecting a complex, multiphase evolution (e.g., Kerr et al, 1997;Grocott & McCaffrey, 2017;St-Onge et al, 2009). The evolution of these domains, including their correlation to a pre-Cretaceous reconstruction is dealt with in detail in van Gool et al (2002) and St-Onge et al (2009), as such only the most salient points relevant to this study are reiterated here.…”

Section: Introductionmentioning

confidence: 99%

Segmentation of Rifts Through Structural Inheritance: Creation of the Davis Strait

et al. 2019

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Mesozoic‐Cenozoic rifting between Greenland and North America created the Labrador Sea and Baffin Bay, while leaving preserved continental lithosphere in the Davis Strait, which lies between them. Inherited crustal structures from a Palaeoproterozoic collision have been hypothesized to account for the tectonic features of this rift system. However, the role of mantle lithosphere heterogeneities in continental suturing has not been fully explored. Our study uses 3‐D numerical models to analyze the role of crustal and subcrustal heterogeneities in controlling deformation. We implement continental extension in the presence of mantle lithosphere suture zones and deformed crustal structures and present a suite of models analyzing the role of local inheritance related to the region. In particular, we investigate the respective roles of crust and mantle lithospheric scarring during an evolving stress regime in keeping with plate tectonic reconstructions of the Davis Strait. Numerical simulations, for the first time, can reproduce first‐order features that resemble the Labrador Sea, Davis Strait, Baffin Bay continental margins, and ocean basins. The positioning of a mantle lithosphere suture, hypothesized to exist from ancient orogenic activity, produces a more appropriate tectonic evolution of the region than the previously proposed crustal inheritance. Indeed, the obliquity of the continental mantle suture with respect to extension direction is shown here to be important in the preservation of the Davis Strait. Mantle lithosphere heterogeneities are often overlooked as a control of crustal‐scale deformation. Here, we highlight the subcrust as an avenue of exploration in the understanding of rift system evolution.

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Basin evolution and destruction in an Early Proterozoic continental margin: the Rinkian fold–thrust belt of central West Greenland

Cited by 34 publications

References 29 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

Integration of Vessel-Based Hyperspectral Scanning and 3D-Photogrammetry for Mobile Mapping of Steep Coastal Cliffs in the Arctic

Segmentation of Rifts Through Structural Inheritance: Creation of the Davis Strait

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