Late Devonian rifting in the central North Sea: evidence from altered felsic volcanic rocks in the Embla oil field

Publication year: 2011
Source: Marine and Petroleum Geology, In Press, Accepted Manuscript, Available online 13 June 2011

A.M., Lundmark , R.H., Gabrielsen , H., Austrheim , K., Flaat , T., Strand , …

In the Embla oil field on the northern flank of the Mid North Sea High, the central North Sea, multiple quartz porphyric volcanic beds at ca. 4600 m depth form part of a volcano-sedimentary interval above the Caledonian basement as interpreted from seismic data. Zircon U-Pb laser ablation ICPMS date one bed to 374 ± 3 Ma, indicating that the volcanic rocks and interbedded sediments are early Famennian and correlate to the Buchan Formation. The volcanic rocks have been extensively clay and carbonate altered in a near surface environment, but high field strength element data show that the protoliths were…