Stratigraphic and provenance evolution of the Southern Apennines foreland basin system during the Middle Miocene to Pliocene (Irpinia-Sannio successions,Italy) |
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| Institution: | 1. Centre d''études nordiques, GEOTOP, Département de Géographie, Université Laval, Québec, Québec G1V 0A6, Canada;2. Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, Rimouski, Québec G5L 3A1, Canada;3. Canada Research Chair in Marine Geology, GEOTOP, Canada;4. Département de chimie, biologie et géographie, Groupe BORÉAS, Université du Québec à Rimouski, Rimouski G5L 3A1, Canada;1. University of Naples Federico II, Department of Earth, Environmental and Resources Science, Via Mezzocannone n° 8, 80134 Naples, Italy;2. U.S. Geological Survey, 12201 Sunrise Valley Drive, 20192 Reston, VA, USA;3. Department of Built Environment, Aalto University, P.O. Box 12100, FI-00076 Aalto, Finland;1. Dipartimento di Scienze e Tecnologie, Università degli Studi di Napoli Parthenope, Centro Direzionale Is C4, 80121 Napoli, Italy;2. Dipartimento di Scienze della Terra, dell''Ambiente e delle Risorse, Università di Napoli Federico II, Largo San Marcellino, 10, 80138 Napoli, Italy;1. Earth Science Department ‘Ardito Desio’, University of Milan, Italy;2. Earth Science Department, University of Rome ‘Sapienza’, Italy;3. Turbidites Research Group, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK |
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| Abstract: | The paper deals with original stratigraphic, petrographic and structural data concerning the evolution of the southern Apennines chain (Italy). The main Langhian to Pliocene deposits cropping out in the northern sector of the southern Apennines foreland basin system (Sannio-Irpinia area) have been studied and correlated in order to document the effects of tectonic changes on the evolution of sandstone detrital modes and stratigraphic architecture. The studied sandstone units can be grouped in five key intervals: a) Numidian Flysch, mostly formed by Langhian mature quartzarenitic deposits and conformable Serravallian post-Numidian successions, formed by arkosic and calciclastic arenaceous-pelitic beds (foreland depozones); b) Langhian to Tortonian San Giorgio Fm., mostly composed of quartzofeldspatic sandstones (foredeep depozone); c) Tortonian to Early Messinian, quartz-feldspatic and partly sedimentary-carbonatoclastic petrofacies, thrust-top successions (Vallone Ponticello, Villanova del Battista and San Bartolomeo fms.); d) Late Messinian quartzolithic to quartzofeldspatic sandstones (Torrente Fiumarella, Anzano Molasse and Tufo-Altavilla unit), which can be referred to infilled thrust-top basins; e) unconformity-bounded Pliocene quartzofeldspatic sandstone strata (wedge-top depozones), characterized by synsedimentary tectonic activity.Detrital modes of the Serravallian through Middle Pliocene sandstones of the southern Apennines foreland basin system testify clear provenance relations from the accreted terranes forming the southern Apennine thrust-belt. The studied clastics show almost the same blended (quartz-feldspatic) composition; this condition could be related to the tectonic transport over thrust ramp of source rocks, as suggested by the tectonic evolutionary model. This study, dealing with sedimentary provenance analysis and tectonostratigraphic evolution, provides an example of the close relations between clastic compositions and foreland basin system development in southern Apennines. |
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| Keywords: | Stratigraphy Sandstone petrology Foreland basin evolution Southern Apennines Italy |
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