West Spitsbergen Orogen

Harland, W. B.; Horsfield, W. T.

doi:10.1144/gsl.sp.2005.004.01.46

Cited by 50 publications

(43 citation statements)

References 11 publications

(6 reference statements)

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“…Others have argued for (i) pure strike-slip faulting (Harland & Horsfield 1974), (ii) a mainly contractional fault zone contemporaneous with (Ohta et al 1992) or late in the fold-thrust belt evolution (Hanisch 1984), or (iii) a normal fault (Lyberis & Manby 1993). The geometric and kinematic pattern of individual structures along the Isfjorden-Ymerbukta Fault Zone may, in isolation, permits the various interpretations.…”

Section: Discussionmentioning

confidence: 99%

“…1b, c). Various structural interpretations of this fault zone have been proposed: Harland & Horsfield (1974) described it as a dextral strike-slip fault, the Isfjorden Fault, whereas Ohta et al (1992) applied the name Ymerbukta Fault for the related reverse element. Other structural interpretations include an oblique-thrust ramp (Bergh et al 1988Dallmann et al 1993), a late thrust (Hanisch 1984), and an extensional (normal) fault (Lyberis & Manby 1993).…”

Section: Introductionmentioning

confidence: 99%

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Kinematics of the Isfjorden-Ymerbukta Fault Zone: A dextral oblique-thrust ramp in the Tertiary fold-thrust belt of Spitsbergen

Braathen

Bergh

Karlsen

et al. 1999

Norsk Geologisk Tidsskrift

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of the IsfjordenYmerbukta Fault Zone: a dextral oblique-thrust ramp in the Tertiary fold-thrust belt of Spitsbergen.The NNE-trending Isfjorden-Ymerbukta Fault Zone is an oblique structural element within the NNW-trending Tertiary transpressional fold-thrust belt of Spitsbergen, Arctic Norway. It can be traced for nearly 50 km, and separates two different structural domains in the fold-thrust welt of Oscar II Land, Central Spitsbergen. The fault zone is more than 500 m wide and contains several segments of highly folded/rotated, faulted and cleaved Triassic through Paleocene rocks. Displacement across the fault zone can be decomposed into (i) a reverse, top-to-the-ENE component with a minimum 650 m vertical throw, and (ii) a horizontal dextral component of approximately 5-10 km. Displacement across the fault decreases northward along strike, where the fault zone merges into parallelism with a ramp-system of the fold-thrust belt. Inherited, underlying Devonian(?)-Carboniferous structures may have controlled the location of the fault zone.Detailed studies of map and mesoscale faults and folds reveal complex geometries and varied kinematic signatures across the fault zone width. Along the southwest portion of the fault zone (Ramfjellet-Erdmannflya) three major fault segments record obliquereverse (Morenekilen fault), combined oblique-reverse and oblique-normal (Straumhallet fault), and dextral strike-slip (Flydammane fault) movements, respectively. Further northeast (Mehøgda-Bohemanflya), a traverse from west to east of three structural domains shows; (1) thrusts and associated folds that record oblique-reverse kinematics, (2) steep faults with dextral strike-slip and conjugate strike-slip (extrusion) movements, and (3) thrusts and oblique-normal faults. The overall kinematics is consistent with mainly oblique-reverse and dextral strike-slip faulting, and subordinate local fault zone-oblique/parallel extension. Various geometries within the fault zone, as well as the variation in the direction of movement on the segments, can be explained from either (i) synchronous shortening and out-of-the-plane movement partitioning, or (ii) an effect of polyphase changes in the orientation of the overall shortening axes during the fold-thrust belt evolution. Either of these interpretations is consistent with the IsfjordenYmerbukta Fault Zone as an oblique-thrust ramp or transfer fault.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinematics of the Isfjorden-Ymerbukta Fault Zone: A dextral oblique-thrust ramp in the Tertiary fold-thrust belt of Spitsbergen

Braathen

Bergh

Karlsen

et al. 1999

Norsk Geologisk Tidsskrift

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“…One sample (ES-10) is significantly older (25797.3 My). Additionally, dating of one dolerite sample (WS-0) from the western Spitsbergen thrust-and-fold belt in the Bellsund area (Birkenmajer 1972;Harland & Horsfield 1974) yielded an age of 118.796.8 My. The great analytical error is the consequence of the high Ar atm contamination, resulting from alteration of the sample.…”

Section: Geochronology Of Dolerites From Svalbardmentioning

confidence: 99%

Dolerites of Svalbard, north-west Barents Sea Shelf: age, tectonic setting and significance for geotectonic interpretation of the High-Arctic Large Igneous Province

et al. 2011

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The dolerites of Svalbard are mineralogically and geochemically homogeneous with geochemical features typical of continental within-plate tholeiites. Their geochemistry is similar to tholeiites belonging to a bimodal suite defined as the High-Arctic Large Igneous Province (HALIP). K–Ar dating of numerous dolerites sampled from many locations across Svalbard define a narrow time span of this magmatism from 125.5±3.6 to 78.3±2.6 Mya. Discrete peaks of intensive activity occurred at 115.3, 100.8, 91.3 and 78.5 Mya corresponding to (1) breakup of the continental crust and formation of an initial rift as a result of mantle plume activity, located in the southern part of the Alpha Ridge; (2) magmatic activity related to spreading along the Alpha Ridge that led to the development of the initial oceanic crust and (3) continuation of spreading along the Alpha Ridge and termination of magmatic activity related to HALIP (last two peaks at 91.3 and 78.5 Mya)

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“…Tertiary deformation in Oscar II Land is largely represented by west-dipping thrust faults and northwest-trending regional folds (e.g. Harland & Horsfield, 1974;Hjelle, Ohta & Winsnes, 1979;Ohta, 1985;Morris, 1988). Birkenmajer (1981) outlined several Tertiary structural domains (Fig.…”

Section: Geologic Settingmentioning

confidence: 99%

“…Significant Tertiary (late Palaeocene-Eocene) orogenic activity is recorded in western Spitsbergen (e.g. Orvin, 1940;Harland & Horsfield, 1974;Dallman, Ohta & Andresen, 1988) and has been interpreted to reflect dextral transpressions which developed when Greenland rotated clockwise relative to Spitsbergen during opening of the Arctic and North Atlantic Oceans (e.g. Harland, 1965;Lowell, 1972;Talwani & Eldholm, 1977;Birkenmajer, 1981;Vogt et al 1981).…”

Section: Introductionmentioning

confidence: 99%

Partial thermal resetting of ⁴⁰Ar/³⁹Ar mineral ages in western Spitsbergen, Svalbard: possible evidence for Tertiary metamorphism

Dallmeyer

1989

Geol. Mag.

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Hornblende and muscovite within high-grade Caledonian metamorphic rocks exposed in Albert I Land (northwest Spitsbergen) display internally concordant 40 Ar/ 39 Ar age spectra providing no record of any post-Silurian thermal history. Both minerals record 420-425 Ma plateau ages indicating that relatively rapid cooling followed Silurian metamorphism. Muscovite within some metamorphic sequences exposed within the Tertiary tectonic zone of Oscar II Land (west-central Spitsbergen) displays a low-temperature 40 Ar/ 39 Ar age spectra discordance suggestive of a slight, post-Caledonian thermal disturbance. This is consistent with a post-Palaeozoic thermal overprint documented elsewhere in Oscar II Land and indicates that, at least locally, metamorphism may have accompanied the Tertiary orogeny.

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West Spitsbergen Orogen

Cited by 50 publications

References 11 publications

Kinematics of the Isfjorden-Ymerbukta Fault Zone: A dextral oblique-thrust ramp in the Tertiary fold-thrust belt of Spitsbergen

Kinematics of the Isfjorden-Ymerbukta Fault Zone: A dextral oblique-thrust ramp in the Tertiary fold-thrust belt of Spitsbergen

Dolerites of Svalbard, north-west Barents Sea Shelf: age, tectonic setting and significance for geotectonic interpretation of the High-Arctic Large Igneous Province

Partial thermal resetting of ⁴⁰Ar/³⁹Ar mineral ages in western Spitsbergen, Svalbard: possible evidence for Tertiary metamorphism

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West Spitsbergen Orogen

Cited by 50 publications

References 11 publications

Kinematics of the Isfjorden-Ymerbukta Fault Zone: A dextral oblique-thrust ramp in the Tertiary fold-thrust belt of Spitsbergen

Kinematics of the Isfjorden-Ymerbukta Fault Zone: A dextral oblique-thrust ramp in the Tertiary fold-thrust belt of Spitsbergen

Dolerites of Svalbard, north-west Barents Sea Shelf: age, tectonic setting and significance for geotectonic interpretation of the High-Arctic Large Igneous Province

Partial thermal resetting of 40Ar/39Ar mineral ages in western Spitsbergen, Svalbard: possible evidence for Tertiary metamorphism

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Partial thermal resetting of ⁴⁰Ar/³⁹Ar mineral ages in western Spitsbergen, Svalbard: possible evidence for Tertiary metamorphism