Groundwater ferricretes from the Silurian of Ireland and Permian of the Spanish Pyrenees

V. P. Wright, R. J. Sloan, B. Valero Garcés, Laurence Garvie

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Haematite nodule horizons occur in alluvial-lacustrine deposits from the Mill Cove Formation (Silurian) of Dingle, Ireland and the Unidad Roja Superior (Permian) of the Spanish Pyrenees. These horizons, generally less than 1 m thick, are not associated with palaeosol profiles but are hosted by laminated or structureless, bioturbated mudstones to sandstones. The sequences contain weakly developed calcrete profiles. The haematite nodules are interpreted as having formed around fluctuating water-tables and are analogous to present-day groundwater ferricretes (laterites or plinthites). Fe2+, mobilised during periods of reducing groundwaters, was segregated into ferric oxide nodules during falls in the water-table or during influxes of oxygenated meteoric waters. The prevailing climate during deposition of both sequences was probably semi-arid and the presence of ferricrete-like horizons is not evidence of humid climates. The horizons represent early "diagenetic" effects, not related to prevailing soil moisture regime.

Original languageEnglish (US)
Pages (from-to)37-49
Number of pages13
JournalSedimentary Geology
Volume77
Issue number1-2
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

Fingerprint

hematite
Silurian
water table
Permian
ferricrete
calcrete
groundwater
laterite
climate
meteoric water
paleosol
mudstone
lacustrine deposit
mill
sandstone
oxide
soil moisture regime
effect
cove

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

Cite this

Groundwater ferricretes from the Silurian of Ireland and Permian of the Spanish Pyrenees. / Wright, V. P.; Sloan, R. J.; Valero Garcés, B.; Garvie, Laurence.

In: Sedimentary Geology, Vol. 77, No. 1-2, 01.01.1992, p. 37-49.

Research output: Contribution to journalArticle

Wright, V. P. ; Sloan, R. J. ; Valero Garcés, B. ; Garvie, Laurence. / Groundwater ferricretes from the Silurian of Ireland and Permian of the Spanish Pyrenees. In: Sedimentary Geology. 1992 ; Vol. 77, No. 1-2. pp. 37-49.
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