The Rattray Volcanics

Middle Jurassic fissure volcanism in the UK Central North Sea

Ailsa K. Quirie (Corresponding Author), Nick Schofield, Adrian Hartley, Malcolm J. Hole, Stuart G. Archer, John R. Underhill, Douglas Watson, Simon P. Holford

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Middle Jurassic Rattray Volcanic Province is located at the triple junction of the North Sea continental rift system. It has previously been thought to be sourced from three large central volcanoes: the Glenn, Fisher Bank and Ivanhoe Volcanic Centres. Re-interpretation using 3D seismic and well data shows that no volcanic centres are present and the Rattray Volcanics were instead sourced in fissure eruptions from linear vents including the Buchan Glenn Fissure System, a ~25km-long zone of WSW-ENE striking linear fissure vents and associated small volcanic edifices across the Buchan-Glenn Horst. The orientation of the fissures is broadly parallel to the Highland Boundary Fault which intersects the Rattray Volcanics at the Buchan-Glenn Fissure System, implying that Middle Jurassic magmatism exploited pre-existing crustal structural anisotropies established during the Caledonian Orogeny. The lack of large intrusive complexes beneath the Rattray Volcanics indicates pre-Middle Jurassic sedimentary sequences (e.g. Devonian-Carboniferous Old Red Sandstone Group, Permian Rotliegend and Zechstein Groups and Triassic Skagerrak Formation) extend further than previously supposed, and therefore the presence of possible sub-volcanic reservoir and source rock units may have been overlooked within the triple junction of the Central North Sea.
Original languageEnglish
Pages (from-to)462-481
Number of pages19
JournalJournal of the Geological Society
Volume176
Early online date23 Nov 2018
DOIs
Publication statusPublished - May 2019

Fingerprint

fissure
volcanism
Jurassic
triple junction
Old Red Sandstone
Zechstein
horst
reservoir rock
Caledonian orogeny
sedimentary sequence
source rock
magmatism
volcanic rock
Permian
anisotropy
Triassic
volcano
volcanic eruption
sea

Keywords

  • ERUPTION
  • FACIES
  • FAROE-SHETLAND BASIN
  • FIELD
  • IGNEOUS ROCKS
  • INSIGHTS
  • INTRUSION
  • LAVA
  • SEQUENCE
  • SYSTEM

ASJC Scopus subject areas

  • Geology

Cite this

The Rattray Volcanics : Middle Jurassic fissure volcanism in the UK Central North Sea. / Quirie, Ailsa K. (Corresponding Author); Schofield, Nick; Hartley, Adrian; Hole, Malcolm J.; Archer, Stuart G.; Underhill, John R.; Watson, Douglas; Holford, Simon P.

In: Journal of the Geological Society , Vol. 176, 05.2019, p. 462-481.

Research output: Contribution to journalArticle

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abstract = "The Middle Jurassic Rattray Volcanic Province is located at the triple junction of the North Sea continental rift system. It has previously been thought to be sourced from three large central volcanoes: the Glenn, Fisher Bank and Ivanhoe Volcanic Centres. Re-interpretation using 3D seismic and well data shows that no volcanic centres are present and the Rattray Volcanics were instead sourced in fissure eruptions from linear vents including the Buchan Glenn Fissure System, a ~25km-long zone of WSW-ENE striking linear fissure vents and associated small volcanic edifices across the Buchan-Glenn Horst. The orientation of the fissures is broadly parallel to the Highland Boundary Fault which intersects the Rattray Volcanics at the Buchan-Glenn Fissure System, implying that Middle Jurassic magmatism exploited pre-existing crustal structural anisotropies established during the Caledonian Orogeny. The lack of large intrusive complexes beneath the Rattray Volcanics indicates pre-Middle Jurassic sedimentary sequences (e.g. Devonian-Carboniferous Old Red Sandstone Group, Permian Rotliegend and Zechstein Groups and Triassic Skagerrak Formation) extend further than previously supposed, and therefore the presence of possible sub-volcanic reservoir and source rock units may have been overlooked within the triple junction of the Central North Sea.",
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note = "PGS are thanked for the generous donation of the MegaSurveyPlus and MegaSurvey 3D seismic data sets. The British Geological Survey are thanked for the generous donation of Digital Magnetic Anomaly data over the Central North Sea. Nexen are thanked for the use of the AM852D1009 2D seismic data. Well and 2D seismic data were downloaded from the UK Oil & Gas Common Data Access (CDA) portal. Offshore gravity and other magnetic anomaly data were accessed on the BGS Offshore GeoIndex. GB onshore aeromagnetic data was downloaded from the BGS Open Geoscience website. Interpretation was carried out using IHS Kingdom, Foster Findlay Associates’ (FFA) GeoTeric and Schlumberger Techlog software. AQ thanks Jonathon Hardman for his advice on spectral decomposition and Niall Mark and Jessica Pugsley for their helpful discussions. We would like to acknowledge John Dixon who pioneered the work on the Triple Junction and who was a key mentor to both NS and JRU. Craig Magee and an anonymous reviewer are thanked for their suggestions which substantially improved this manuscript. Funding This work is part of AQ’s PhD research which is funded by the Carnegie Trust for the Universities of Scotland. AQ would like to thank the Carnegie Trust for their continued support.",
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KW - FIELD

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KW - LAVA

KW - SEQUENCE

KW - SYSTEM

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