☆ 4.3 Article

Re-interpretation of a Lower-Middle Cambrian West Gondwanan ramp depositional system: a case study from the Cantabrian Zone (NW Spain)

FACIES (2009)

Journal

FACIES

Volume 55, Issue 3, Pages 473-487

Publisher

SPRINGER

DOI: 10.1007/s10347-008-0174-0

Keywords

Lower-Middle Cambrian; Carbonate ramp; Spain; Lancara Formation; Microfacies; Palaeoenvironment; Palaeoecology

Categories

Geology Paleontology

Funding

German Research Foundation [EL 144/12]

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Abstract

Detailed litho- and biofacies investigations of the Lower-Middle Cambrian carbonate Lancara Formation resulted in its subdivision into nine lithofacies types: (1) claystone, (2) recrystallized mudstone, (3) laminated mudstone with laminoid-fenestral fabrics, (4) stromatolite, (5) laminated aggregate grainstone, (6) non-laminated aggregate grainstone, (7) oolitic-bioclastic floatstone, (8) echinodermal packstone, and (9) bioclastic grainstone. The thicknesses of lithofacies 1-7 (lower member of the Lancara Formation) decrease from south to north. Lithofacies types 8-9 (upper member of the Lancara Formation) are characterized by similar thicknesses and low facies and faunal gradients and are thus indicative of deposition on a carbonate ramp. From palaeoecological, palaeo(bio)geographical, palaeomagnetic, and tectonic considerations, the depositional environment of the Lancara Formation is re-interpreted as an eastward/north-eastward sloping, low morphology carbonate ramp. The Cantabrian Zone, with a primary lateral extension of about 300 km, is further construed to be an element of a widespread and connected, discontinuous drowned Perigondwanan depositional system.

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Facies distribution patterns and environment reconstruction of the upper member of the Lancara Formation in the Somiedo-Correcilla unit (Lower-Middle Cambrian, Cantabrian zone, NW Spain) with special respect to biofacial investigations

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