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The Holocene
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A mineral magnetic study of Holocene sediment yields and deposition patterns in the Llyn Geirionydd catchment, north Wales

I. Snowball

(Department of Geology and Geophysics, University of Edinburgh, J.C.M.B., Kings Buildings, Mayfield Road, Edinburgh EH9 3JZ, UK)

R. Thompson

(Department of Geology and Geophysics, University of Edinburgh, J.C.M.B., Kings Buildings, Mayfield Road, Edinburgh EH9 3JZ, UK)

Mineral magnetic investigations of sediment cores and catchment materials from Llyn Geirionydd (north Wales) form the basis of a study of Holocene sediment yields and deposition patterns. Catchment soils and bedrock materials are highly variable in magnetic concentration. In contrast, the lake sediments are more homogenous in magnetic concentration. Magnetic hysteresis properties of catchment materials, bulk sediments and magnetic extracts demonstrate that the occurrence of authigenic greigite (Fe3S4) in early Holocene sediments is responsible for differences between the magnetic characteristics of sediments older than 5000 BP, and the more recent sediments and catchment materials. A whole-lake stratigraphy based on core correlation using magnetic measurements, pollen stratigraphy and 14C age determinations indicates sediment yields which increase almost threefold from the early Holocene to the period from c. AD 500-1850.

Key Words: Llyn Geirionydd • Holocene • sediment yield • magnetic mineral • greigite • Wales.

The Holocene, Vol. 2, No. 3, 238-248 (1992)
DOI: 10.1177/095968369200200305
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