A fault-controlled depositional model for the Aberystwyth Grits turbidite system

D. Wilson, Jeremy Davies, R. A. Waters, J. A. Zalasiewicz

Research output: Contribution to journalArticlepeer-review

Abstract

The Aberystwyth Grits Group was the first in a series of southerly-supplied sandstone-rich turbidite systems that invaded the Welsh Basin during the Telychian Stage (late Llandovery; Silurian). Structural and stratigraphical evidence indicates that deposition of the sand-dominated parts of the system was largely restricted to the east by a zone of syndepositional faulting, now marked by a major vergence divide. Downfaulting and reverse drag along the fault hangingwall created a bathymetric low, which focused deposition of high-density, sand-carrying turbidite flows and flow components, allowing substantial thicknesses of sediment to accumulate. In contrast, low-density, mud-rich turbidites were deposited over a wider area, enhancing the topographic relief generated by uplift above the fault footwall, to form a feature which restricted the spread of the coeval easterly-supplied turbidites of the Devil's Bridge Formation.
Original languageEnglish
Pages (from-to)595-607
Number of pages13
JournalGeological Magazine
Volume129
Issue number5
DOIs
Publication statusPublished - Sept 1992

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