Magnetic stratigraphy and biostratigraphy of Pliocene "argille azzurre" (Northern Apennines, Italy)

Author(s): Channell, J. E. T.; Poli, M. S.; Rio, D.; Sprovieri, R.; Villa, G.
Author Affiliation(s): Primary:
University of Florida, Gainesville, FL, United States
Università di Padova, Italy
Università di Palermo, Italy
Università di Parma, Italy
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 110(1-2), p.83-102. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 62 refs.; illus. incl. 1 table, strat. cols.
Summary: An integrated biomagnetostratigraphic chronology for the Mediterranean Pliocene has been developed in the last five years mainly from land sections in Southern Italy (Calabria and Sicily) and ODP Leg 107 (Tyrrhenian Sea) cores. In this paper, the chronology is applied to terrigenous sediments from the Northern Apennine foredeep where reworking, as well as sedimentation rate and facies variations, limit the resolution of biostratigraphy and physical stratigraphy. The integrated chronology gives improved stratigraphic control for a Messinian to Upper Pliocene section exposed on the banks of the Stirone River near Parma (Northern Italy) and for a short Lower Pliocene section located nearby at Sant'Andrea Bagni. The sections are in the vicinity of stratotype sections for the Tabianian (Lower Pliocene) and Piacenzian (Upper Pliocene), and the chronology gives new insights into the complex Pliocene sedimentation history in the Northern Apennine foredeep at this time. At the Stirone section, the base of the Pliocene record is in a normal polarity chron correlated to the Thvera subchron, indicating a hiatus at the Miocene/Pliocene boundary and the absence of the MPL1 foraminiferal zone. At Sant'Andrea Bagni, MPL1 is also missing, in contrast to previous reports. We conclude that this biozone is probably absent throughout the Northern Apennines where post-Messinian flooding appears to have occurred at the onset of MPL2 time. During the Gilbert Chron, sedimentation rates at Stirone reached 104cm/kyr, as nearly 300 m of "argille azzurre" (blue clay) were deposited in less than 0.5 Myr. Very sporadic sedimentation is apparent from the late Nunivak to the top of the section (late Gauss Chron), with a number of hiatuses being recognized within Chron 2Ar (late Gilbert) and in the early Gauss. This interruption of sedimentation at about 4.1 Ma is associated with a widely recognized Early Pliocene tectonic event involving thrusting and migration of the depocenter of the Northern Apennine foredeep.
Year of Publication: 1994
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Apennines; Biostratigraphy; Biozones; Calabria Italy; Cenozoic; Europe; Foraminifera; Interpretation; Invertebrata; Italy; Leg 107; Lithostratigraphy; Magnetostratigraphy; Mediterranean Sea; Microfossils; Models; Nannofossils; Neogene; Northern Apennines; Ocean Drilling Program; Paleomagnetism; Plantae; Pliocene; Protista; Sedimentation; Sedimentation rates; Sicily Italy; Southern Europe; Stirone Italy; Tertiary; Thallophytes; Tyrrhenian Sea; West Mediterranean
Coordinates: N393000 N404000 E0141000 E0103500
Record ID: 1994046537
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands