CONFERENCE PAPER:
IX th Congress of RCMNS, 27-30 September 2000, Fes, Morocco, p.13.
Author :
Speranta-Maria Popescu.
Abstract:
High-resolution pollen analysis has been applied to several sections of the Dacic Basin (SW Romania). A model has been recently performed by Clauzon and Suc (unpublished) which evidences that the uppermost Bosphorian clays of the western Dacic Basin belong to the lowermost Zanclean, that also is supported by the occurrence of Mediterranean nannofloras NN12 zone (Marunteanu, personal information). These deposits and the overlying aggrading paleo-Danube delta have been respectively measured from paleomagnetic point of view (Krijgsman, personal information, Radan and Radan, 1996, van Vught, 2000).
A first climatostratigraphic relationship between the Pliocene sediments of the Dacic Basin and the Mediterranean Garraf 1 borehole has been suggested by Drivaliari et al., (1999) on the basis of pollen analysis of the Ticleni borehole.
A very detailed pollen analysis at high-resolution of exposed sections corresponding to the time range of the Ticleni pollen sequence specifies the subdivisions of the uppermost Bosphorian – Dacian – Romanian succession into climatic phases in correspondence with Mediterranean Zanclean to lower Piacenzian. For example, the three climatic phases of the Zanclean (pollen zones PI&, PIb and PIc of Suc, 1984) are documented as well as the passage to the early Piacenzian cooling. Pollen signal in the Dacic Basin appears in good agreement with the global oxygene curve (Shackleton et al. 1965). As a consequence, the previous assignment of the normal paleomagnetic events recorded in the series (Radan and Radan, 1996, van Vught, 2000) is discussed and for some events reinterpreted, that allows to calibrate the Bosphorian –Dacian and Dacian – Romanian boundaries by respect to the global time scale.