GNGTS 2016 - Atti del 35° Convegno Nazionale

530 GNGTS 2016 S essione 3.2 carbonate turbidites supplied from the shelf alternate with clastic sediments (Unit 4b). The trend of carbonate-siliciclastic facies recognized in the Late Oligocene-Early Miocene suggests a progressive deepening of the basin. The increase of the space available for the sedimentation resulted in higher sedimentation rates, increasing from 20-30 m/My to 60-70 m/My. This trend was reversed from the D unconformity, when a relative sea level fall took place with a rate lower than the rate of subsidence (Type 2 sequence boundary), producing minor emersions of the platform and the slope. During the Late Miocene the siliciclastic supply of the South-Adriatic foredeep highly increased (Unit 5b), being supplied from source areas composed from the outer thrusts of the Dinarids-Hellenids. In this period the Apulian platform constituted again the stable foreland of the Apenninic thrust belt, being deformed. The E Messinian unconformity may be put in relationships with a general sea level fall, with an eustatic rate higher than the rate of subsidence (Type 1 sequence boundary), which verified about 5.5 My ago, generating the well-known salinity crisis of the Mediterranean (Cita, 1982). As a next step the Plio-Pleistocene Adriatic foredeep generated and was filled by the siliciclastic turbidites of the Unit 6b, showing a progressive deepening towards south-east. The Adriatic foredeep was progressively supplied by turbidite fans, prograding in a longitudinal way and from sediments of outer basinal plain, supplied from the Apenninic chain during its formation (Casnedi et al. , 1982). References Aiello G. (1992) Analisi sismo-stratigrafica del margine apulo nell’offshore delle Murge settentrionali. Giornale di Geologia, 54 (1) , 3-18, Bologna. Aiello G., Graziano R. (1993) Outcrop and seismic unconformities in the Cretaceous-Tertiary of the Apulian region. A land-sea correlation. 4 th Workshop of the International Lithosphere Program Task Force “Origin of Sedimentary Basins”, Benevento, Italy, Abstract and Poster. Cita M.B. (1982) The Messinian salinity crisis in the Mediterranean: a review. In: Berckhemer H., Hsu K. (Eds.) Alpine-Mediterranean geodynamics. AGU/GSA Geodyn. Ser., 7 , 113-140. Cloetingh S. (1988) Intraplate stresses: a tectonic cause for third-order cycles in apparent sea level. In: Wilgus C.K. (Ed.) Sea level changes: an integrated approach. SEPM Spec. Publ., 42 , 19-29. D’Argenio B. (1974) Le piattaforme carbonatiche periadriatiche: una rassegna di problemi nel quadro geodinamico mesozoico dell’area mediterranea. Mem. Soc. Geol. It., 13 (2) , 137-159. D’Argenio B., Mindszenty A. (1991) Karst bauxites at regional unconformities and geotectonic correlation in the Cretaceous of the Mediterranean. Boll. Soc. Geol. It., 110 , 1-8. D’Argenio B., Mindszenty A. (1992) Tectonic and climatic control on paleokarst and bauxites. Giornale di Geologia, 54 , 207-218. D’Argenio B., Pescatore T., Scandone P. (1973) Schema geologico dell’Appennino meridionale (Campania e Lucania). Proc. Cong. “Moderne Vedute sulla Geologia dell’Appennino”, Acc. Naz. Lincei, Quad. 183 , 49-72. Dolan J.F. (1989) Eustatic and tectonic controls on deposition of hybrid siliciclastic/carbonate basinal cycles: discussion with examples. AAPG Bull., 73 , 1233-1246. Graziano R. (1992) Il margine cretacico della Piattaforma carbonatica Apula nel Promontorio Garganico. Sedimentologia e stratigrafia sequenziale. Rend. Acc. Sc. Fis. e Mat. in Napoli, Ser. 4°, 59 , 173-198. Graziano R. (1993) Il margine cretacico della Piattaforma carbonatica Apula nel Promontorio Garganico. Sedimentologia e stratigrafia sequenziale. Tesi di Dottorato di Ricerca in Geologia del Sedimentario, Università di Napoli “Federico II”, Napoli, Italy. Haq B.U., Hardenbol J., Vail P.R. (1987) Chronology of fluctuating sea levels since the Triassic. Science, 235 , 1156- 1167. Martinis B., Pavan G. (1967) Note illustrative al foglio 157 “M.te S. Angelo”. Servizio Geologico d’Italia, Roma, 56 pp. MindszentyA., D’Argenio B.,AielloG. (1993) Lithospheric bulge-related uplift as recorded by regional unconformities – the case of Apulia. Tectonophysics, 252 , 137-162. Pieri P., Laviano A. (1989) Tettonica e sedimentazione nei depositi senoniani delle Murge sud-orientali. Boll. Soc. Geol. Ital., 108 , 351-356.