Glaucophane Schists of Caledonian age from Spitsbergen

Horsfield, W. T.

doi:10.1017/s0016756800042242

Cited by 58 publications

(48 citation statements)

References 9 publications

(9 reference statements)

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“…The archipelago of Svalbard (Spitsbergen), isolated by the Atlantic Ocean, was a part of the European continent before the Cretaceous-Tertiary opening of the northern Atlantic Ocean. Horsfield (1972) described blueschists from Oscar II Land in western Spitsbergen, and reported K-Ar dates of 470 Ma (ph) and 475 Ma (ph) and whole-rock ages of 402 Ma, 428 Ma, and 621 Ma. Ohta et al (1983) confirmed preDevonian metamorphism by documenting an unconformable contact between underlying schists and overlying Devonian strata.…”

Section: Fig 11 Schematic Illustration Showing the Distribution Andmentioning

confidence: 99%

Blueschists and Eclogites of the World and Their Exhumation

Maruyama

Liou

Terabayashi

1996

International Geology Review

576

364

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Section: Fig 11 Schematic Illustration Showing the Distribution Andmentioning

confidence: 99%

Blueschists and Eclogites of the World and Their Exhumation

Maruyama

Liou

Terabayashi

1996

International Geology Review

576

364

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“…Recent U-Pb zircon and Rb-Sr data suggest that the amphibolite metamorphism might be Grenvillian in age (Gavrilenko et al 1993;Balasov et al 1995). Based on the numerous Caledonian cooling ages north of this study area (Gayer et al 1966;Horsfield, 1972;E. C. Hauser, unpub.…”

Section: Geological Settingmentioning

confidence: 99%

Thermochronological evidence for late Proterozoic (Vendian) cooling in southwest Wedel Jarlsberg Land, Spitsbergen

et al. 1998

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Two Proterozoic terranes with different metamorphic histories are distinguished from geological mapping in southwestern Wedel Jarlsberg Land: a northern greenschist facies terrane and a southern amphibolite facies terrane which has been overprinted by greenschist facies metamorphism. To better characterize the tectonothermal history of these terranes we have obtained new 40 Ar/ 39 Ar mineral dates from this area. A muscovite separate from the northern terrane yielded a Caledonian plateau age of 432 ± 7 Ma. The southern terrane yielded significantly older 40 Ar/ 39 Ar ages with three muscovite plateau dates of 584 ± 14 Ma, 575 ± 15 Ma, and 459 ± 9 Ma, a 484 ± 5 Ma biotite plateau date, and a 616 ± 17 Ma hornblende plateau date. The oldest thermochronological dates are over 300 Ma younger than the age of amphibolite facies metamorphism and therefore probably do not represent uplift-related cooling. Instead, the Vendian dates correlate well with a regionally widespread magmatic and metamorphic/thermal resetting event recognized within Caledonian complexes of northwestern Spitsbergen and Nordaustlandet. The apparent Ordovician dates are interpreted to represent partial resetting, suggesting that late Caledonian greenschist facies overprinting of the southern terrane was of variable intensity.

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“…The HP rocks are represented by carbonates, blueschists, eclogites and glaucophane-bearing metasediments accompanied by serpentinites. Available geochronological data suggest a c. 470 Ma age of metamorphism based on K-Ar muscovite dating [22], 40 Ar/ 39 Ar muscovite and paragonite dating ( [11], Fig. 2), lower intercept of the U-Pb zircon discordia [5] as well as Rb-Sr analyses [11].…”

Section: Caledonian Orogenymentioning

confidence: 99%

Magmatic and metamorphic events recorded within the Southwestern Basement Province of Svalbard

Majka

Kośmińska

2017

Arktos

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A recent increase in fieldwork activity within the Southwestern Basement Province (SBP) of Svalbard followed by detailed geochronological and petrological studies has allowed recognition of previously unknown magmatic and metamorphic events in the studied region. These discoveries of, e.g. true c. 950 Ma granitic magmatism, c. 640 Ma Torellian metamorphism, completely new localities of high-pressure rocks and a c. 360 Ma Ellesmerian, Barrovian-type metamorphic sequence emphasize the importance of further research in this part of the Svalbard Archipelago. Paleogene tectonic overprint of the SBP, manifested by the West Spitsbergen Fold and Thrust Belt, is an additional challenge for geologists working in this part of Svalbard's crystalline basement, and must be taken into account in all interpretations of pre-Cenozoic structures. Several enigmatic issues concerning the evolution of the SBP remain unanswered. Hence, there is a need for continued research in this key area for understanding the geological evolution of the northern Barents Shelf and High Arctic in general.

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Glaucophane Schists of Caledonian age from Spitsbergen

Cited by 58 publications

References 9 publications

Blueschists and Eclogites of the World and Their Exhumation

Blueschists and Eclogites of the World and Their Exhumation

Thermochronological evidence for late Proterozoic (Vendian) cooling in southwest Wedel Jarlsberg Land, Spitsbergen

Magmatic and metamorphic events recorded within the Southwestern Basement Province of Svalbard

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