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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Geology of the North Atlantic Borderlands — Memoir 7, 1981
Pages 563-584
European Borderlands

Mesozoic Sedimentary Succession at Andoy, Northern Norway, and Relation to Structural Development of the North Atlantic Area

A. Dalland

Abstract

The Jurassic—Lower Cretaceous succession at Andoy occurs in a small, fault-bounded area at the eastern coast of the island. Total thickness of the succession is more than 500 m, consisting of two major fining-upwards sequences, one of Middle Jurassic (Bajocian — Bathonian) to Ryazanian age, the other one of Valanginian to Aptian age. The outcrop area is situated at the western margin of a very narrow rift or graben trending north-south. K/A dating of weathered basement below the Mesozoic succession indicates a Late Devonian/Early Carboniferous event of deep tropical weathering followed by deposition of a very thick upper Paleozoic succession. During Triassic time, uplift occurred and the Paleozoic succession was nearly completed eroded. Only a thin Carboniferous (?) limestone was left by Middle Jurassic time when a new cycle of sedimentation was initiated by blockfaulting in the area. Faulting probably also occurred in the area within Ryazanian, Aptian and Turonian times, and perhaps also during Tertiary time. The Mesozoic geological evolution at Andoy is very similar to that of the East Greenland area, and there also are strong similarities to the development of the Vestfjord basin farther south along to the Norwegian coast. It is suggested that a Mesozoic rift may have existed from the Vestfjord area and northwards to Andoy, and that the Jurassic rift pattern between Norway and Greenland consisted of a central rift flanked on each side by basement uplifts and narrow rift zones parallel to the central rift landward of the uplifts.


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