(Tephra studies as a tool in quaternary research - 1981)

Document title

A textural study of basaltic tephras from lower Tertiary diatomites in northern Denmark in Tephra studies.

Authors(s) and Affiliation(s)

PEDERSEN A. K. ; JORGENSEN K. A. ; SELF S. (Editeur scientifique) ; SPARKS R. S. J. (Editeur scientifique) ; NATO Advanced Study Institute ; 


More than 200 tephra layers deposited in early Tertiary diatomite and clay in northern Denmark record explosive volcanism in the Skagerrak and in the North Sea. The early activity is basaltic, rhyolitic, and mafic and salic alkaline while later activity is exclusively tholeiitic Fe-Ti-basaltic. Several of the younger basaltic tephras exceed 4 km by volume. The morphology and grain size of the tephras indicate both subaerial and phreatic activity. The Fe-Ti-basaltic tephras are distinctly surtseyan in type, wich may indicate volcanism in a shallow sea environment.



Tephra studies as a tool in quaternary research ()

Editor : Unknown country of publication (1981)

Millesime : 1981 [pp. 213-218]

Bibliographic references : 20 réf.




Bibliothèque du centre de géographie - Paris

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