Unconformity-bounded stratigraphy in the Plio-Pleistocene continental record: new insights from the Alessandria Basin (NW Italy)
作者： Andrea Irace , Giovanni Monegato , Evdokia Tema , Edoardo Martinetto , Daniele Gianolla
DOI: 10.1002/GJ.2744
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摘要: Combined stratigraphic and bio-magnetostratigraphic analyses on a fluvial sequence from the southern margin of Alessandria Basin (at junction between Alps Apennines) provide evidence for first documentation late Piacenzian–Gelasian continental record in northern Italy. The basin experienced general growth at margins ongoing subsidence depocentre, during overthrusting onto Po Foreland Basin. studied succession is 25–30 m thick can be divided into three units (MRZ1, MRZ2 MRZ3) delimited by erosional unconformities (S1, S2 S3). MRZ1 (shallow to confined braided systems) are chronologically restricted 2.8 2.58 Ma based analyses. overall framework indicates deposition erosion progressive uplift Alps/Apennines system. frequency sedimentary changes, compared other coeval successions syn-orogenic basins central Italy, suggests interaction high-amplitude global cold stages tectonic deformation. Tectonic climax occurred Gelasian, as revealed 450- 600-ka-long hiatus associated with S3 unconformity, whereas subsequent MRZ3 unit (meandering alluvial system) including Gelasian magnetic reversal points fading activity. reconstruction provided this study enriches current knowledge European biota: absence thermophilous elements carpoflora reflects Piacenzian cooling phase after 2.8 Ma, persistence several extra-European taxa (e.g. Ampelopsis cf. ludwigii, Boehmeria lithuanica, Cryptomeria rhenana) rules out an age younger than 1.4 Ma. freshwater mollusc assemblage shows occurrence Pomatias elegans Tournouerina belnensis, identified time Pliocene Copyright © 2015 John Wiley & Sons, Ltd.
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