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STRATI 2013 pp 475-480 | Cite as

Volcanism, Relative Sea-Level Change, and the Stratigraphic Record: An Oligocene Example

  • Andrea di CapuaEmail author
  • Gianluca Groppelli
  • Giovanni Vezzoli
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

Volcanoes are revealed to be complex and dynamically evolving edifices, characterized by both eruptive activity and episodes of instability that can periodically cause catastrophic debris avalanches and huge debris flows (Mcguire 1996). Moreover, the geodynamic context of their locations can interact with the development of different sedimentary systems (Le Friant et al. 2011; Sisavath et al. 2011) as well as with the emplacement of different processes (Watt et al. 2012; Sisavath et al. 2012; Crutchley et al. 2013), dramatically influencing the stratigraphic record of the surrounding basins. However, the role of climatic changes in depositional processes is still debated (KrastelS and Jacobs 2001; Quidelleur et al. 2008; Sisavath et al. 2012). Here, we present an example from the Oligocene fore deep of the Alps, now contained in the Northern Apennines, where the interaction between volcanic activity and relative sea-level changes has been recorded in the Val d’Aveto Formation, with an age 32–29 Ma (Elter et al. 1999; Catanzariti et al. 2009). Two volcaniclastic members (the lowest conglomeratic, containing Oligocene andesitic clasts (Mattioli 1997), the uppermost medium to coarse arenitic with polygenic conglomerate lenses in it) are found above a carbonate to siliciclastic member (pelitic and fine to very fine arenitic, with conglomerate lenses on top), and these units show how the onset of active volcanism in the sediment source area interacts with the sediment supply during a regressive phase. We performed detailed fieldwork, conducted pebble counts on 11 conglomerate beds, examined two thin-sections of micro conglomerate, integrated the data with information from the literature (Elter et al. 1999), and compared the results to the Oligocene palaeoclimate record and global sea-level curve (Haq et al. 1987; Sissingh 2001; Miller et al. 2005; Pälike et al. 2006). This allowed us to recognize an important increase in the grain size of single pebbles and of the arenitic matrix, from the siliciclastic to the volcaniclastic members, with a large increase of volcanic rock fragments in the latter (Elter et al. 1999). Moreover, this increase of volcanic pebbles is not constant. These results seem to emphasize the role of an active, synsedimentary volcanism in a source area, even in relation with the first regressive stage: an increase of sediment production, strongly dependent on grain size; sediment production independent of relative sea-level changes; and a general increase of grain size due to the increase of energy in sediment transport. This work is still in progress. The analysis of the Alpine Oligocene record in both the Molassa and fore deep basins, and its comparison with the Jurassic Cañadón Asfalto Basin (Patagonia, Argentina) and datasets of modern systems, will allow us to improve these preliminary, local conclusions regarding sediment production and depositional processes in volcanic-related basins.

Keywords

Active volcanism Depositional processes Sea-level changes Sediment production Sediment budget 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Andrea di Capua
    • 1
    Email author
  • Gianluca Groppelli
    • 2
  • Giovanni Vezzoli
    • 1
  1. 1.Università degli Studi di Milano-BicoccaMilanItaly
  2. 2.CNR—Istituto per la Dinamica dei Processi AmbientaliMilanItaly

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