Single-grain zircon dating of the metamorphic and granitic rocks from the Biscayarhalvøya-Holtedahlfonna zone, north-west Spitsbergen

Ohta, Y.; Ларионов, А. Н.; Tebenkov, Alexander M.

doi:10.3402/polar.v22i2.6459

Cited by 12 publications

(6 citation statements)

References 23 publications

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“…The LA-ICP-MS ages of 1100–1200 Ma, 1300–1400 Ma and 1650–1750 Ma in combination with the ion microprobe identification of the presence of 1350 Ma xenocrysts in sample SVL 145, suggest that the BIS magmatic rocks were generated by melting of rocks with Grenvillian signatures. Similar ages have also been recorded in the metasedimentary rocks of northwestern Spitsbergen (Montblanc Formation) and associated migmatites (Ohta, Larionov & Tebenkov, 2003) and from the Krossfjorden Group metasediments (Pettersson, Pease & Frei, 2009). The 1350 Ma ages, in particular, have been compared with the Metamec Complex and Nain Plutonic Suite of the Eastern Grenville Province (Pettersson Pease & Frei, 2009).…”

Section: Discussionsupporting

confidence: 71%

Torellian (c. 640 Ma) metamorphic overprint of Tonian (c. 950 Ma) basement in the Caledonides of southwestern Svalbard

et al. 2013

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Ion microprobe dating in Wedel Jarlsberg Land, southwestern Spitsbergen, provides new evidence of early Neoproterozoic (c. 950 Ma) meta-igneous rocks, the Berzeliuseggene Igneous Suite, and late Neoproterozoic (c. 640 Ma) amphibolite-facies metamorphism. The older ages are similar to those obtained previously in northwestern Spitsbergen and Nordaustlandet where they are related to the Tonian age Nordaustlandet Orogeny. The younger ages complement those obtained recently from elsewhere in Wedel Jarlsberg Land of Torellian deformation and metamorphism at 640 Ma. The Berzeliuseggene Igneous Suite occurs in gently N-dipping, top-to-the-S-directed thrust sheets on the eastern and western sides of Antoniabreen where it is tectonically intercalated with younger Neoproterozoic sedimentary formations, suggesting that it provided a lower Tonian basement on which upper Tonian to Cryogenian sediments (Deilegga Group) were deposited. They were deformed together during the Torellian Orogeny, prior to deposition of Ediacaran successions (Sofiebogen Group) and overlying Cambro-Ordovician shelf carbonates, and subsequent Caledonian and Cenozoic deformation. The regional importance of the late Neoproterozoic Torellian Orogeny in Svalbard's Southwestern Province and its correlation in time with the Timanian Orogeny in the northern Urals as well as tectonostratigraphic similarities between the Timanides and Pearya (northwestern Ellesmere Island) favour connection of these terranes prior to the opening of the Iapetus Ocean and Caledonian Orogeny.

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Section: Discussionsupporting

confidence: 71%

Torellian (c. 640 Ma) metamorphic overprint of Tonian (c. 950 Ma) basement in the Caledonides of southwestern Svalbard

et al. 2013

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“…These ages, in agreement with one 40 Ar/ 39 Ar age on hornblende (454.9 ± 0.7 Ma, Dallmeyer et al [1990]) postdate the HP metamorphism and may represent reequilibration in the amphibolite facies. A composite scenario with protolith intrusion in the Ediacarian and cooling in the Cambrian, followed by a thermal overprint at HP metamorphism in the Ordovician has been suggested in recent discussions for the Richarddalen complex [ Gromet and Gee , 1998; Ohta et al , 2003]. HP events would therefore apparently be Ordovician in Motalafjella and Biscayarhalvøya.…”

Section: Time Constraints On the Hp Metamorphism And Subsequent Coolingmentioning

confidence: 97%

Structural analysis of high‐pressure metamorphic rocks of Svalbard: Reconstructing the early stages of the Caledonian orogeny

et al. 2008

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[1] The basement of Svalbard comprises several terranes that were assembled along NS-trending faults during the Caledonian orogeny. The NW and NE parts of Svalbard are considered to be derived from east Greenland, while SW Svalbard has affinities with Pearya, Ellesmere Island. High-pressure (HP) metamorphic rocks, such as eclogites and blueschists occur in west Svalbard and provide constraints on the history of the Caledonian convergence. The Motalafjella HP rocks display a geometry which is compatible with an initial dome structure sealed by Ordovician deposits. Retrogressed eclogites in Biscayarhalvøya appear in the uppermost unit of a nappe stack that formed in a constrictional deformation regime. The syncollisional exhumation of the eclogites was achieved before the deposition of Late Silurian conglomerates. The two field occurrences of HP rocks are interpreted with a detailed age review for the Svalbard terranes and a restoration of Svalbard paleogeography in the Devonian. We propose that the different tectonic events are part of a continuous Ordovician-Silurian orogenic sequence, predating the Scandian collision between Laurentia and Baltica. The closure of an ocean between Laurentia and a microplate was responsible for the formation and exhumation of the HP rocks of Motalafjella in the Ordovician, and later followed by the collision of the microplate with Laurentia in the Silurian. This orogenic phase can be considered as an equivalent of the Taconic orogeny in the Appalachians. The relative position of the Svalbard terranes and Greenland during this orogenic episode is constrained by strain directions measured in the field.Citation: Labrousse, L., S. Elvevold, C. Lepvrier, and P. Agard (2008), Structural analysis of high-pressure metamorphic rocks of Svalbard: Reconstructing the early stages of the Caledonian orogeny, Tectonics, 27, TC5003,

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“…The metasedimentary successions are intruded locally by 960 Ma granites (Ohta & Larionov, 1998; and have yielded detrital zircons as young as 1015 Ma (Fig. 3), with populations ranging back to c. 1.8 Ga and a few grains from the Neoarchaean (Ohta, Larionov & Tebenkov, 2003;Pettersson, Pease & Frei, 2009). Thus, the Northwestern Province is Figure 3.…”

Section: A Svalbardmentioning

confidence: 99%

“…3), with populations ranging back to c . 1.8 Ga and a few grains from the Neoarchaean (Ohta, Larionov & Tebenkov, 2003; Pettersson, Pease & Frei, 2009). Thus, the Northwestern Province is similar to the lower structural levels on Nordaustlandet.…”

Section: Eurasian High Arcticmentioning

confidence: 99%

The Grenville–Sveconorwegian orogen in the high Arctic

et al. 2012

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AbstractThroughout the high Arctic, from northern Canada (Pearya) to eastern Greenland, Svalbard, Franz Josef Land, Novaya Zemlya, Taimyr and Severnaya Zemlya and, at lower Arctic latitudes, in the Urals and the Scandinavian Caledonides, there is evidence of the Grenville–Sveconorwegian Orogen. The latest orogenic phase (c. 950 Ma) is well exposed in the Arctic, but only minor Mesoproterozoic fragments of this orogen occur on land. However, detrital zircons in Neoproterozoic and Palaeozoic successions provide unambiguous Mesoproterozoic to earliest Neoproterozoic (c. 950 Ma) signatures. This evidence strongly suggests that the Grenville–Sveconorwegian Orogen continues northwards from type areas in southeastern Canada and southwestern Scandinavia, via the North Atlantic margins to the high Arctic continental shelves. The widespread distribution of late Mesoproterozoic detrital zircons far to the north of the Grenville–Sveconorwegian type areas is usually explained in terms of long-distance transport (thousands of kilometres) of either sediments by river systems from source to sink, or of slices of lithosphere (terranes) moved on major transcurrent faults. Both of these interpretations involve much greater complexity than the hypothesis favoured here, the former involving recycling of the zircons from the strata of initial deposition into those of their final residence and the latter requiring a diversity of microcontinents. Neither explains either the fragmentary evidence for the presence of Grenville–Sveconorwegian terranes in the high Arctic, or the composition of the basement of the continental shelves. The presence of the Grenville–Sveconorwegian Orogen in the Arctic, mainly within the hinterland and margins of the Caledonides and Timanides, has profound implications not only for the reconstructions of the Rodinia supercontinent in early Neoproterozoic time, but also the origin of these Neoproterozoic and Palaeozoic mountain belts.

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Single-grain zircon dating of the metamorphic and granitic rocks from the Biscayarhalvøya-Holtedahlfonna zone, north-west Spitsbergen

Cited by 12 publications

References 23 publications

Torellian (c. 640 Ma) metamorphic overprint of Tonian (c. 950 Ma) basement in the Caledonides of southwestern Svalbard

Torellian (c. 640 Ma) metamorphic overprint of Tonian (c. 950 Ma) basement in the Caledonides of southwestern Svalbard

Structural analysis of high‐pressure metamorphic rocks of Svalbard: Reconstructing the early stages of the Caledonian orogeny

The Grenville–Sveconorwegian orogen in the high Arctic

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