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The "Clay-with-Flints' deposit in Northern Ireland: reassessment of the evidence for an early Paleocene ignimbrite
Geol Survey Northern Ireland, Dundonald House,Upper Newtownards Rd, Belfast BT4 3SB, Antrim, North Ireland.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
Geol Survey Northern Ireland, Dundonald House,Upper Newtownards Rd, Belfast BT4 3SB, Antrim, North Ireland.
2018 (English)In: Geological Magazine, ISSN 0016-7568, E-ISSN 1469-5081, Vol. 155, no 8, p. 1811-1820Article in journal (Refereed) Published
Abstract [en]

Reassessment of key geological sections, field relationships and petrographical characteristics of the Northern Ireland Clay-with-Flints' and Donald's Hill Ignimbrite Formation' show they formed dominantly by sedimentary processes. The involvement of a previously postulated pyroclastic flow during early Paleocene time is not recognized and, as such, the Donald's Hill Ignimbrite Formation stratigraphic term is discounted. Instead a multistage model of formation by sedimentary accumulation and remobilization is presented and the term Clay-with-Flints is retained. Regionally, two dominant facies are recognized in most Clay-with-Flints sections. Facies 1 was formed by an initial accumulation of flints on a chalk landscape undergoing karstification, and involved deposition of a clay matrix derived predominantly from contemporaneous erosion of subtropical soil horizons formed mainly on basalt. In Facies 2, evidence is observed for widespread remobilization of Facies 1 deposits by high-density mudflows driven by the advancement of the Antrim Lava Group, which caused the blockage of subsurface and marginalization of surface drainage. A stratigraphical constraint imposed by the presence of a supposed ignimbrite in this part of the North Atlantic Igneous Province has been problematic, but this is resolved by its identification as a diachronous, sedimentary deposit that formed until buried by either the lower or upper formations of the Antrim Lava Group.

Place, publisher, year, edition, pages
CAMBRIDGE UNIV PRESS , 2018. Vol. 155, no 8, p. 1811-1820
Keywords [en]
"Clay-with-Flints', ignimbrite, Paleocene, stratigraphy
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-363200DOI: 10.1017/S0016756817000760ISI: 000445338400011OAI: oai:DiVA.org:uu-363200DiVA, id: diva2:1257085
Funder
Swedish Research CouncilAvailable from: 2018-10-18 Created: 2018-10-18 Last updated: 2018-10-18Bibliographically approved

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Troll, Valentin R.

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