Oudet, Julien and Münch, Philippe and Verati, Chrystèle and Ferrandini, M. and Melinte-Dobrinescu, Mihaela Carmen and Gattacceca, Jérôme and Cornée, Jean-Jacques and Oggiano, Giacomo and Quillévéré, Frédéric and Borgomano, Jean and Ferrandini, Jean (2010) Integrated chronostratigraphy of an intra-arc basin: 40Ar/39Ar datings, micropalaeontology and magnetostratigraphy of the early Miocene Castelsardo basin (Northern Sardinia, Italy). Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 295 (1-2), p. 293-306. ISSN 0031-0182. Article.
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The chronostratigraphy of the lower Miocene deposits of northwestern Sardinia is refined in the Castelsardo Basin. The combination of new 40Ar/39Ar isotopic datings, 19 micropalaeontological datings (calcareous nannofossils, planktonic and large benthic foraminifers) and 16 palaeomagnetic polarity measurements led to a new chronostratigraphic framework. The continental deposits of the first megasequence (Valledoria and Casteldoria members) are possibly Aquitanian. The overlying marine sediments are early Burdigalian (Vaginella depressa Molasse). The marine transgression can be dated to around 19.7 Ma. Marine conditions ceased 18.83±0.13 Ma, the age of the index aerial τ2 ignimbrite. The continental part of the second megasequence (“Lacustre” unit) is early-middle Burdigalian, between 18.8 and 18 Ma. The overlying marine part (Campulandu and Sedini members) is middle-late Burdigalian. The second marine transgression began in the earliest-late Burdigalian, during the Chron C5Dr reversal, at the time of the eustatic Bur 4 event.
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