期刊
FACIES
卷 55, 期 3, 页码 473-487出版社
SPRINGER
DOI: 10.1007/s10347-008-0174-0
关键词
Lower-Middle Cambrian; Carbonate ramp; Spain; Lancara Formation; Microfacies; Palaeoenvironment; Palaeoecology
资金
- German Research Foundation [EL 144/12]
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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