Timing of Silurian to middle Devonian deformation in the Caledonides of Scandinavia, Svalbard and E Greenland

Roberts, David L.

doi:10.1144/gsl.sp.1988.038.01.26

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…In the study area, the Särv, Saetra, and Leksdal Nappes are composed of sandstones intruded by mafi c dikes Roberts, 1988;Greiling, 1989), while sandstones without dikes compose the Offerdal, Kvitvola, and Dearka Nappes . The Tännäs, Risberget, and Jotun Nappes include a variety of dominantly alkalic plutonic rocks .…”

Section: Middle Allochthonmentioning

confidence: 99%

Continental collisions and the creation of ultrahigh-pressure terranes: Petrology and thermochronology of nappes in the central Scandinavian Caledonides

Hacker¹,

Gans²

2005

Geol Soc America Bull

121

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The formation of the vast Devonian ultrahigh-pressure terrane in the Western Gneiss Region of Norway was investigated by determining the relationship between these ultrahigh-pressure rocks and the structurally overlying oceanic and continental Köli and Seve Nappes in the Trondelag-Jämtland region. Thermobarometry and thermochronology reveal that the oceanic Köli Nappes reached peak conditions of 9-10 kbar and 550-650 °C prior to muscovite closure to Ar beginning at ca. 425 Ma. The continental Seve Nappes attained slightly higher pressures and temperatures (~11-12 kbar and 700-725 °C) and closed to Ar loss in muscovite by 415 Ma in the east and by 400 Ma in the west. In contrast, the ultrahigh-pressure rocks were still deep in the mantle at eclogitefacies pressures at 410-400 Ma. These data, in combination with structural, petrological, and thermochronological data from elsewhere in the orogen, show that the ultrahighpressure metamorphism occurred in the late stages of continental collision, after the earlier stages of ophiolite emplacement and passive-margin subduction.

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Section: Middle Allochthonmentioning

confidence: 99%

Continental collisions and the creation of ultrahigh-pressure terranes: Petrology and thermochronology of nappes in the central Scandinavian Caledonides

Hacker¹,

Gans²

2005

Geol Soc America Bull

121

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“… A synthesis of indicators for continental compressional deformation and mountain building in Late Devonian times for the Appalachians (data from Laird, 1988; Ettensohn, 1995; Murphy and Keppie, 1998), the North African Variscides (data from Piqué et al ., 1993; Echarfaoui et al ., 2002), the European Variscides (data from Ballévre et al ., 1994; Santallier et al ., 1994; Matte, 1995; Maluski and Patocka, 1997; Tait et al ., 1997), the southern Urals (data from Matte, 1995; Puchkov, 1997), the Ellesmerides–Svalbard belt (data from Roberts, 1988; Embry, 1991) and the Antler belt (data from Johnson and Pendergast, 1981). Note the onset of collision and continental uplift at around 380 Ma.…”

Section: The Acadian‐eovariscan Mountain Building Eventmentioning

confidence: 99%

Mountain building‐enhanced continental weathering and organic carbon burial as major causes for climatic cooling at the Frasnian–Famennian boundary (c. 376 Ma)?

Averbuch¹,

Tribovillard²,

Devleeschouwer³

et al. 2005

Terra Nova

117

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The Late Devonian was a period of drastic environmental changes, as exemplified by a major biotic crisis at the Frasnian–Famennian boundary (FFB) and the onset in Famennian times of glaciations across southern Gondwana. Worldwide evidence for the coeval development of the major Acadian–Eovariscan belt led us to propose a model relating the Late Frasnian–Famennian environmental perturbations to extensive continental uplift through two atmospheric CO2‐depleting mechanisms: (1) the intensification of silicate weathering on the continental areas as attested by a major rise in the 87Sr/86Sr composition of sea water at the FFB; and (2) the massive burial of organic carbon (Kellwasser events) in partially confined basins due to the collisional‐induced reduction of equatorial oceanic communications between the Palaeotethysian and Panthalassic oceans. This process is also suggested to have been controlled by an important primary productivity connected to an increased nutrient availability triggered by the enhanced continental run‐off.

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“…Two major orogenic events have been postulated for the development of the northern Scandinavian Caledonides, i.e. a Late-Cambrian-Early-Ordovician event, known as the 'Finnmarkian' and a Silurian to Early Devonian, 'Scandian' event (Sturt, Miller & Fitch 1967;Pringle & Sturt 1969;Sturt, Pringle & Ramsay 1978;Ramsay et al 1985;Roberts 1988a). Western Finnmark (Fig.…”

Section: Regional Geology a N D Samplingmentioning

confidence: 99%

On the palaeogeography of Baltica during the Palaeozoic: new palaeomagnetic data from the Scandinavian Caledonides

Torsvik

Olesen

Ryan

et al. 1990

Geophysical Journal International

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Based on new palaeomagnetic results from the North Norwegian Caledonides, we propose new apparent polar wander paths for Baltica during the Early-Mid Palaeozoic and discuss their palaeogeographic implications.In Cambrian and Early Ordovician times, Baltica occupied southerly latitudes of the order of 30" to SO", but was 'inverted' with respect to its present orientation. Consequently, the Russian Platform faced Avalonia and Gondwana, the latter continent occupying high southerly latitudes. Closure of the Tornquist Sea was then accompanied by continental scale, anticlockwise rotation of Baltica relative to Avalonia. This rotation probably occurred during mid-Ordovician times, although as yet, the timing of final suturing is poorly constrained by available palaeomagnetic data. At this time Laurentia occupied an equatorial position.Baltica then moved northwards in Late Ordovician and Silurian times, and subsequently collided obliquely with Laurentia to produce the Mid-Silurian to Early Devonian Scandian Orogeny . Oblique convergence set up sinistral orogen-parallel shear zones, on which major movements ceased by Late Silurian times. After amalgamation, Baltica and Laurentia occupied equatorial to tropical southerly latitudes.Reconstructions for the Siluro-Devonian boundary are now relatively straightforward. Euramerica was assembled by that time, and occupied equatorial (N. Baltica) to high (c. 60") southerly latitudes (S. Laurentia) prior to northerly movement and the final assembly of Pangea.

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Timing of Silurian to middle Devonian deformation in the Caledonides of Scandinavia, Svalbard and E Greenland

Cited by 7 publications

References 14 publications

Continental collisions and the creation of ultrahigh-pressure terranes: Petrology and thermochronology of nappes in the central Scandinavian Caledonides

Continental collisions and the creation of ultrahigh-pressure terranes: Petrology and thermochronology of nappes in the central Scandinavian Caledonides

Mountain building‐enhanced continental weathering and organic carbon burial as major causes for climatic cooling at the Frasnian–Famennian boundary (c. 376 Ma)?

On the palaeogeography of Baltica during the Palaeozoic: new palaeomagnetic data from the Scandinavian Caledonides

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