K-Ar dating of basic intrusions at Bellsund, Spitsbergen, Svalbard

Birkenmajer, Krzysztof; Krajewski, Krzysztof P.; Pécskay, Zoltán; Lorenc, Marek W.

doi:10.4202/ppres.2010.01

Cited by 37 publications

(53 citation statements)

References 2 publications

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“…This and subsequent approaches (Burov et al 1977;Vincenz et al 1981;Birkenmajer et al 2010) are discussed below vis-à-vis the dates we obtained. There are, however, some lines of geological evidence that may be conclusive in this respect.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…We suppose the production of this lava from the Lutynia area (Poland) where the vent is located, 1-2 km from the sampled location. The idea of this relation was tested using a comparison of magnetic properties of basalts on both sides of the border, comparing data of the Zálesí lava flow and previously published data from Lutynia (Birkenmajer et al 2002).…”

Section: Zálesí Lava Flowmentioning

confidence: 99%

“…These volcanics represent primitive basaltic magmas (Vokurka & Bendl 1992, much like most other similar Cenozoic volcanics in the Bohemian Massif. These rocks were studied in their paleomagnetic properties by Marek (1969Marek ( , 1973Marek ( , 1974 and Kolofíková (1976), in the Czech Republic and by Birkenmajer et al (2002) in Poland.…”

Section: Introductionmentioning

confidence: 99%

Chronological implications of the paleomagnetic record of the Late Cenozoic volcanic activity along the Moravia-Silesia border (NE Bohemian Massif)

Cajz¹,

Schnabl²,

Pécskay

et al. 2012

Geologica Carpathica

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This paper presents the results of a paleomagnetic study carried out on Plio-Pleistocene Cenozoic basalts from the NE part of the Bohemian Massif. Paleomagnetic data were supplemented by 27 newly obtained K/Ar age determinations. Lavas and volcaniclastics from 6 volcanoes were sampled. The declination and inclination values of paleomagnetic vectors vary in the ranges of 130 to 174 and -85 to -68° for reversed polarity (Pleistocene); or 345 to 350° and around 62°f or normal polarity (Pliocene). Volcanological evaluation and compilation of older geophysical data from field survey served as the basis for the interpretation of these results. The Pleistocene volcanic stage consists of two volcanic phases, fairly closely spaced in time. Four volcanoes constitute the Bruntál Volcanic Field; two others are located 20 km to the E and 65 km to the NW, respectively. The volcanoes are defined as monogenetic ones, producing scoria cones and lavas. Exceptionally, the largest volcano shows a possibility of remobilization during the youngest volcanic phase, suggested by paleomagnetic properties. The oldest one (4.3-3.3 Ma), Břidličná Volcano, was simultaneously active with the Lutynia Volcano (Poland) which produced the Zálesí lava relic (normal polarity). Three other volcanoes of the volcanic field are younger and reversely polarized. The Velký Roudný Volcano was active during the Gelasian (2.6-2.1 Ma) and possibly could have been reactivated during the youngest (Calabrian, 1.8-1.1 Ma) phase which gave birth to the Venušina sopka and Uhlířský vrch volcanoes. The reliability of all available K-Ar data was evaluated using a multidisciplinary approach.

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“…The northern Antarctic Peninsula region contains a geological record of the evo− lution of West Antarctica, reflecting a series of paleoclimatic and paleoenviron− mental changes that led to the emergence and development of the Antarctic ice sheet close to the Eocene/Oligocene boundary (Dingle and Lavelle 2000; Birkenmajer et al 2005;Ivany et al 2006;Francis et al 2009). The Cenozoic strata on King George Island (KGI) comprise mostly basaltic and andesitic rocks intruded by dykes and plugs (e.g.…”

Section: Introductionmentioning

confidence: 99%

Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica

Mozer¹,

Pécskay²,

Krajewski³

2015

Polish Polar Research

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Abstract:Radiometric and geochemical studies were carried out at Red Hill in the southern part of King George Island (South Shetland Islands, northern Antarctic Peninsula) on the Bransfield Strait coast. The rock succession at Red Hill has been determined to represent the Baranowski Glacier Group that was previously assigned a Late Cretaceous age. Two forma− tions were distinguished within this succession: the lower Llano Point Formation and the up− per Zamek Formation. These formations have stratotypes defined further to the north on the western coast of Admiralty Bay. On Red Hill the Llano Point Formation consists of terrestrial lavas and pyroclastic breccia; the Zamek Formation consist predominantly of fine to coarse tuff, pyroclastic breccia, lavas, tuffaceous mud−, silt−, and sandstone, locally conglomeratic. The lower part of the Zamek Formation contains plant detritus (Nothofagus, dicotyledonous, thermophilous ferns) and numerous coal seams (vitrinitic composition) that confirm the abundance of vegetation on stratovolcanic slopes and surrounding lowlands at that time. Se− lected basic to intermediate igneous rocks from the succession have been analysed for the whole−rock K−Ar age determination. The obtained results indicate that the Red Hill succes− sion was formed in two stages: (1) from about 51-50 Ma; and (2) 46-42 Ma, i.e. during the Early to Middle Eocene. This, in combination with other data obtained from other Bara− nowski Glacier Group exposures on western coast of Admiralty Bay, confirms the recently defined position of the volcano−clastic succession in the stratigraphic scheme of King George Island. The new stratigraphic position and lithofacies development of the Red Hill succession strongly suggest its correlation with other Eocene formations containing fossil plants and coal seams that commonly occur on King George Island.

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K-Ar dating of basic intrusions at Bellsund, Spitsbergen, Svalbard

Cited by 37 publications

References 2 publications

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

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

Chronological implications of the paleomagnetic record of the Late Cenozoic volcanic activity along the Moravia-Silesia border (NE Bohemian Massif)

Eocene age of the Baranowski Glacier Group at Red Hill, King George Island, West Antarctica

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