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Reconstructing the Alpine orogenic wedge and its foreland basin; the petrologic transition from Cretaceous passive-margin to Eocene foreland sedimentation in northern Corsica (France)

William Cavazza, Giorgio Gandolfi and Luigi Paganelli
Reconstructing the Alpine orogenic wedge and its foreland basin; the petrologic transition from Cretaceous passive-margin to Eocene foreland sedimentation in northern Corsica (France) (in Tectonics, sedimentary basins, and provenance; a celebration of the career of William R. Dickinson, Raymond V. Ingersoll (editor), Timothy F. Lawton (editor) and Stephan A. Graham (editor))
Special Paper - Geological Society of America (December 2018) 540: 741-757

Abstract

A broad synform in the Balagne region of northern Corsica (France) comprises the most complete remnant of the southwestern Alpine foreland basin and associated orogenic wedge, which have been otherwise fragmented and mostly eroded by a late Cenozoic postcollisional episode of microplate dispersal along the southern European continental margin. The Upper Cretaceous-Eocene turbidites of the Balagne region record the opening and subsequent progressive closure of the Ligurian-Piedmont ocean, the main branch of the Alpine Tethys in the Western Mediterranean. Sandstone detrital modes (gross and heavy-mineral compositions) of the Balagne turbidites can be compared with those of age-equivalent lithostratigraphic units of the western Alps and the Northern Apennines, thus defining broad sediment paleodispersal patterns and providing compelling paleogeographic constraints on the transition from pre-orogenic passive-margin to synorogenic foreland sedimentation. Upper Cretaceous turbidites of the Novella and Alturaia Formations were deposited along the northeastern (European) margin of the narrow Ligurian-Piedmont ocean. In contrast, the mixed carbonate/siliciclastic turbidites of the Upper Cretaceous Narbinco Formation have a distinct composition relative to the age-equivalent Novella and Alturaia Formations and cannot have been derived from the same sediment source area of the Helminthoid Flysch of the Northern Apennines and the Ligurian Alps. The Middle Eocene Balagne foreland basin fill represents a phase of sediment underfilling during the progressive flexure of the Corsican foreland in front of the advancing Alpine orogenic wedge. The basin-fill succession consists of, from bottom to top: (1) continental-to-transitional conglomerate and sandstone filling paleodepressions within the foreland basement complex; (2) thin and discontinuous nummulitic limestone capping-and partly lateral equivalent to-the basal conglomerate; (3) hemipelagic pelite; and (4) a thick turbidite section.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 540
Title: Reconstructing the Alpine orogenic wedge and its foreland basin; the petrologic transition from Cretaceous passive-margin to Eocene foreland sedimentation in northern Corsica (France)
Title: Tectonics, sedimentary basins, and provenance; a celebration of the career of William R. Dickinson
Author(s): Cavazza, WilliamGandolfi, GiorgioPaganelli, Luigi
Author(s): Ingersoll, Raymond V.editor
Author(s): Lawton, Timothy F.editor
Author(s): Graham, Stephan A.editor
Affiliation: University of Bologna, Department of Biolgoical, Geolgoical and Environmental Sciences, Bologna, Italy
Affiliation: University of California Los Angeles, Department of Earth, Planetary, and Space Sciences, Los Angeles, CA, United States
Pages: 741-757
Published: 20181228
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 9780813795409
References: 71
Accession Number: 2020-013061
Categories: Structural geologySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 2 tables, sketch maps
N41°15'00" - N43°00'00", E08°30'00" - E09°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 202009
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