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The Søre Lyklingholmen Formation: Coarse Sedimentary Breccias Related to Submarine Faulting in the Iapetus Ocean

Knut G. Amaliksen and Brian A. Sturt
The Journal of Geology
Vol. 94, No. 1 (Jan., 1986), pp. 109-120
Stable URL: http://www.jstor.org/stable/30081058
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Søre Lyklingholmen Formation: Coarse Sedimentary Breccias Related to Submarine Faulting in the Iapetus Ocean
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Abstract

The Lykling Ophiolitic Complex is composed of the Lykling ophiolite, the Geitung formation, plagiogran-ites, and the Søre Lyklingholmen formation. The ophiolite is unconformably overlain by the late Cambrian Geitfung fm., which, together with cross-cutting plagiogranites, represents the development of a primitive volcanic arc. The Søre Lyklingholmen fm. rests unconformably on the other units and is dominated by coarse sedimentary breccias whose clasts were derived exclusively from the underlying parts of the Lykling Ophiolitic Complex. The breccias form both coarsening-upward and fining-upward sequences and are interpreted to represent submarine scree and sediment gravity flow deposits. The breccias contain angular to subangular clasts more than 100 m across. We consider that the deposition of the Søre Lyklingholmen fm. was related either to submarine fault-scarps associated with the uplift history of a primitive volcanic arc in the Iapetus Ocean or to an oceanic fracture zone that intersected the arc.

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