Earliest Zanclean age for the Colombacci and uppermost Di Tetto formations of the “latest Messinian” northern Apennines: New palaeoenvironmental data from the Maccarone section (Marche P
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- 作者：Speranta-Maria Popescu ; Mihaela-Carmen Melinte ; Jean-Pierre Suc ; Georges Clauzon ; Fré ; dé ; ric Quillé ; vé ; ré ; ; Maria Sü ; to-Szentai
- 关键词：Zanclean transgression ; Calcareous nannofossils ; Marine dinoflagellate cysts ; Lago Mare
Mots clé ; s ; Transgression zanclé ; enne ; Nannofossiles calcaires ; Kystes de dinoflagellé ; s marins ; Lago Mare - 刊名：Geobios
- 出版年：2007
- 出版时间：May-June 2007
- 年：2007
- 卷：40
- 期：3
- 页码：359-373
- 全文大小：2695 K
文摘
The occurrence of planktonic foraminifers in the latest Messinian deposits (uppermost Di Tetto Formation and Colombacci Formation) of the Marche Province (Apennine foredeep, Italy) has stimulated a debate since the 1970s. An earlier palynological study of the entire Maccarone section revealed a pronounced, and a sudden increasing frequency of saccate pollen grains which indicates more distal conditions, and thus a transgression. At first attributed to tectonic activity, this transgression is now interpreted as representing the Zanclean marine transgression after the discovery of Ceratolithus acutus, the calcareous nannofossil marker of the earliest Zanclean in the Mediterranean Sea. Evidence from marine dinoflagellate cysts and planktonic foraminifers supports this result. The Colombacci Formation and uppermost part of the Di Tetto Formation (i.e. the entire p–ev2 stratigraphic unit) belong to the earliest Zanclean. The so-called Lago Mare no longer has a regional chronostratigraphic sense, and should be understood as the invasion of Paratethyan organisms via surface waters owing to a connection at high sea-level between the Aegean Sea and the Eastern Paratethys (Dacic Basin). A new robust environmental reconstruction of the northern Apennine foredeep is proposed, which respectively considers the effects of tectonics and Mediterranean eustasy.