Nuovi risultati sul comportamento idrodinamico dei gusci fossili di Nummulites da due banchi a nummuliti del Bartoniano e Priaboniano dell’Italia settentrionale
- Author(s)
- Mona Seddighi, Antonino Briguglio, Johann Hohenegger, Cesare Andrea Papazzoni
- Abstract
Settling velocities of 58 well-preserved tests of fossil Nummulites were experimentally determined using a settling tube. The tests were collected from the nummulite banks of Pederiva di Grancona (A forms of N. lyelli and N. striatus, Middle Eocene) and San Germano dei Berici (A and B forms of N. fabianii, Late Eocene), both in the Berici Mts. (Veneto, northern Italy). The data were compared with estimated settling velocities that the same specimens might have had in life conditions. This was done by reconstructing their densities simulating water-filled condition and, to simulate post-diagenetic effects, under calcite-filled condition. These simulations show that A and B forms, even if they greatly diverge in shape, volume and size, still possess comparable settling velocities, and that each nummulite bank is characterized by specific hydrodynamic parameters. The use of settling velocity as a parameter to quantify the hydrodynamic behaviour of particles in seawater enables estimation of palaeoenvironmental conditions such as depth, substrate and the energy scenario. Such information is useful in obtaining further insights into the genesis of nummulite banks, the autochthony or allochthony of which is still being debated. Our results point to an autochthonous interpretation.
- Organisation(s)
- Department of Palaeontology, Dean's office of the Faculty of Life Sciences
- External organisation(s)
- Università degli Studi di Modena e Reggio Emilia, Universiti Brunei Darussalam (UBD)
- Journal
- Bollettino della Societa Paleontologica Italiana
- Volume
- 54
- Pages
- 103-116
- No. of pages
- 14
- ISSN
- 0375-7633
- DOI
- https://doi.org/10.4435/BSPI.2015.06
- Publication date
- 09-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105118 Palaeontology
- Keywords
- ASJC Scopus subject areas
- Palaeontology
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/nuovi-risultati-sul-comportamento-idrodinamico-dei-gusci-fossili-di-nummulites-da-due-banchi-a-nummuliti-del-bartoniano-e-priaboniano-dellitalia-settentrionale(762d7b9a-894a-41e2-80d4-43421ae9aefc).html