NDLI: Geochemistry of Precambrian basic igneous rocks between St. Jonsfjorden and Isfjorden, central western Spitsbergen, Svalbard

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Glaciation development and interstadial sea-level on central Spitsbergen, Svalbard

A pockmark field in the central Barents Sea; gas from a petrogenic source?

Askeladden Delta Sequence (Palaeocene) on Spitsbergen - sedimentation and controls on delta formation

Geochemistry of Precambrian basic igneous rocks between St. Jonsfjorden and Isfjorden, central western Spitsbergen, Svalbard

Geochemistry of the late Proterozoic Kapp Hansteen igneous rocks of Nordaustlandet, Svalbard

Metamorphism of the Mullerneset Formation, St. Jonsfjorden, Svalbard

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Age determination in Svalbard ptarmigan Lagopus mutus hyperboreus

The Arctic skua Stercorarius parasiticus L. in northwest Hornsund, Spitsbergen, summer of 1980

Comments to a polar bear population model

Volume 1982, 1982

Geochemistry of Precambrian basic igneous rocks between St. Jonsfjorden and Isfjorden, central western Spitsbergen, Svalbard

Content Provider	Taylor & Francis Online
Author	Ohta, Yoshihide
Abstract	Two types of basic igneous rocks have been mapped in the middle Hecla Hoek succession in the area between St. Jonsfjorden and Isfjorden, central western Spitsbergen: the metadiabase-gabbros from the calc-argillo-volcanic formation and the Trollheimen volcanics from the quartzite-shale formation; both formations are older than the Eocambrian tilloid formation. The former has diabasic and gabbroic textures and occurs as thin discontinuous lensoid masses, while the latter exhibits definite extrusive structures with large amounts of pyroclastics and tuffs and relatively small amounts of solid lavas with abundant amygdules. Both basic rocks have been metamorphosed under the greenschist facies conditions, characterized by actinolite-epidote-biotite-albite assemblage.The metadiabase-gabbros are moderate-high Fe tholeiites and the Trollheimen volcanics are mainly Na-alkaline, accompanied by a small amount of calk alkaline rocks. The immobile minor and trace element contents indicate that the metadiabase-gabbros are oceanic, similar to the MORB, while those of the Trollheimen volcanics show non-oceanic chemical characteristics and occur in shallow marine, shelfshelfedge sediments.The calc-argillo-volcanic formation reveals a shallow marine sedimentary environment and this does not conform with the oceanic nature of the metadiabase-gabbros, occurring in the formation. To overcome this disagreement, an idea of changing tectonic position is postulated to bring a shallow marine sedimentary regime onto a mid-oceanic tectonic zone. This hypothesis supports the concept of active consuming margin tectonics of the Svalbard Caledonides and explains, for example, the occurrence of the high-P metamorphic rocks in the western part of the present area.
Starting Page	49
Ending Page	67
Page Count	19
File Format	PDF HTM / HTML
ISSN	17518369
DOI	10.3402/polar.v3i1.6939
Journal	Polar Research
Volume Number	3
Issue Number	1
Language	English
Publisher	Routledge
Publisher Date	2016-12-16
Access Restriction	Open
Content Type	Text
Resource Type	Article
Subject	1900/1901 Environmental Chemistry Environmental Science Oceanography

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