East Greenland caledonian Fold Belt

Henriksen, N

doi:10.4095/103557

Cited by 61 publications

(74 citation statements)

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“…Sedimentary deposits of East Greenland are widely exposed in the Caledonian realm and adjoining areas extending from 70° to 82°N; in addition, exposures of Cretaceous and earliest Tertiary sediments occur north of Kangerdlugssuaq and local Eocene deposits cover the Blosseville plateau (Haller, 1971;Birkelund & Perch-Nielsen, 1976;Dawes, 1976;Henriksen & Higgins, 1976;Soper et al, 1976a,b). Several of the stones, regardless their lithology, can be argued to have been derived from sedimentary formations because of their more or less well-rounded shapes (Fig.…”

Section: Provenance Of Ird With a Sedimentary Originmentioning

confidence: 99%

“…These high-grade gneisses, with local evidence of granulite facies (Henriksen & Higgins, 1976;Henriksen, 1985;Higgins, 1988;Kalsbeek et al, 1993a,b;Kalsbeek, 1995), are exposed in the shield, continuously along the southeastern coast up to the Kangerdlugssuaq Fjord (68°30'N) and further north in a narrow zone landinward from the Blosseville Kyst, disappearing under the inland ice; in the foreland and basement complexes of the Caledonides, they occur throughout most of the length of the belt. Additional outcrops are found at Liverpool Land, a coastal peninsula between 70°30' and 71°30'N, in a horst-like structure outlying from the main exposures of gneiss.…”

Section: Provenance Of the Metamorphic Irdmentioning

confidence: 99%

“…The hinterland of DS97-18-19, the limestone with Palaeozoic brachiopods and gastropods, must be restrained to exposures of the Lower Ordovician, which form a narrow zone in the central fjord zone, from Ella 0 to Heim Bjerge, between 72°50' and 74°N (Henriksen & Higgins, 1976).…”

Section: Provenance Of Ird With a Sedimentary Originmentioning

confidence: 99%

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Provenance of coarse ice-rafted detritus near the SE Greenland margin

Linthout

Troelstra

Kuijpers

2000

Netherlands Journal of Geosciences

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The provenance of coarse-grained ice-rafted detritus has been studied, based on material collected from the SE Greenland margin.The sediment was sampled by a 1.5 m 3 video-grab from 1256 m water depth. The fraction > 1cm was macroscopically investigated and a thin-section analysis was made. The results clearly show that East Greenland north of the Denmark Strait is the source region of the material sampled. The main provenance is from areas adjoining Kangerdlugssuaq Fjord, Blosseville Kyst, Scoresby Sund, Kong Oskar Fjord, and Kejser Franz Joseph Fjord. It can thus be demonstrated that significant ice-stream activity and iceberg calving occurred there. Present-day iceberg production is mainly concentrated to the Scoresby Sund, but the other areas apparently represent locations of larger ice-stream activity during periods prior to the Holocene.More generally, it can be concluded that southerly surface-water flow similar to the present East Greenland Current must also have occurred prior to the Holocene. Although either North America (Canada) or Scandinavia -or both -are generally referred to as important regions for the provenance of ice-rafted detritus, we conclude that (East) Greenland may have been an important source for (late) glacial North Atlantic ice-rafted detritus production as well.

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Section: Provenance Of Ird With a Sedimentary Originmentioning

confidence: 99%

Section: Provenance Of the Metamorphic Irdmentioning

confidence: 99%

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Provenance of coarse ice-rafted detritus near the SE Greenland margin

Linthout

Troelstra

Kuijpers

2000

Netherlands Journal of Geosciences

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“…The marbles were found on the occasion of a mapping expedition of the Geological Survey of Greenland (1972) to the southern termination of the migmatite zone (Bucher, 1979). For description and discussion of the various aspects of the regional geology, refer to Henriksen & Higgins (1976), and Steiger et al (1979).…”

Section: General Geologymentioning

confidence: 99%

Mechanism of Mineral Reactions Inferred from Textures of Impure Dolomitic Marbles from East Greenland

Bucher-Nurminen¹

1982

Journal of Petrology

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Mineral assemblages and chemical compositions of minerals found in impure dolomitic marbles embedded in gneisses and migmatites of the E. Greenland Caledonian fold belt (Scoresby Sund) suggest that the marbles were metamorphosed near 630 °C at 5 kb pressure. The analysis of complex textural and mineralogical relations among minerals such as dolomite, calcite, forsterite, pargasite, chlorite, spinel, diopside and phlogopite led to the conclusion that the major mineralogical features of the rocks were probably caused by sodium metasomatism at constant temperature and pressure. The effect of the inferred sodium metasomatism may be summarized by three schematic reactions all involving modal changes of excess dolomite, calcite, forsterite, chlorite and spinel: (a) nucleation and growth of pargasite, (b) resorption of phlogopite, and (c) growth of pargasite from phlogopite.

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“…Henriksen & Higgins 1976). Modern studies of this complex show that rocks that did experience Caledonian metamorphism and deformation are regionally underlain by Archaean and Proterozoic basement with relatively minor Caledonian overprint, and that the abscherunzone is an extensional detachment (e.g.…”

Section: The Fixist Eramentioning

confidence: 99%

The detachment era (1977–1982) and its role in revolutionizing continental tectonics

Wernicke

2009

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After the discovery of thrust-and-nappe structure near the turn of the twentieth century, mountain belts were viewed as a direct expression of horizontal shortening of the continental crust, and continental rifting was viewed as a phenomenon distinct from it. By mid-century, broad consensus had emerged, mainly on the basis of physical reasoning, that thrust-and-nappe structure instead reflected gravity sliding secondary to vertical motions of the crust, as embodied in the influential stockwerk folding hypothesis. In a noteworthy period from 1977 to 1982, informally referred to here as the 'detachment era', not only did the last vestiges of support for the stockwerk hypothesis evaporate, but large-magnitude extension was discovered throughout the Cordillera, manifest primarily by extensional detachments and metamorphic core complexes. Soon afterward extensional detachments were recognized as a global phenomenon, forcing first-order reinterpretation of field relations in most orogens. Although plate tectonics is indisputably the most profound discovery in Earth sciences in the twentieth century, the detachment era arguably had commensurate impact on field-based interpretations of continental tectonics. Three decades later, controversy persists over the origin of metamorphic tectonites in core complexes, and over the existence and mechanics of slip on shallowly dipping extensional detachments.

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East Greenland caledonian Fold Belt

Cited by 61 publications

References 0 publications

Provenance of coarse ice-rafted detritus near the SE Greenland margin

Provenance of coarse ice-rafted detritus near the SE Greenland margin

Mechanism of Mineral Reactions Inferred from Textures of Impure Dolomitic Marbles from East Greenland

The detachment era (1977–1982) and its role in revolutionizing continental tectonics

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