The lacustrine deposits of Fornaci di Ranica (late Early Pleistocene, Italian Pre-Alps): stratigraphy, palaeonvironmental and geological evolution. (Articolo in rivista)

Type
Label
  • The lacustrine deposits of Fornaci di Ranica (late Early Pleistocene, Italian Pre-Alps): stratigraphy, palaeonvironmental and geological evolution. (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.quaint.2004.07.021 (literal)
Alternative label
  • Ravazzi C., Pini R., Breda M., Martinetto E., Muttoni G., Chiesa S., Confortini F., Egli R. (2005)
    The lacustrine deposits of Fornaci di Ranica (late Early Pleistocene, Italian Pre-Alps): stratigraphy, palaeonvironmental and geological evolution.
    in Quaternary international; Elsevier Science Ltd., Oxford (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ravazzi C., Pini R., Breda M., Martinetto E., Muttoni G., Chiesa S., Confortini F., Egli R. (literal)
Pagina inizio
  • 35 (literal)
Pagina fine
  • 58 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.journals.elsevier.com/quaternary-international/ (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 131 (literal)
Rivista
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  • 23 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Cesare Ravazzi (a), Roberta Pini (a,b), Marzia Breda (c,d), Edoardo Martinetto (e), Giovanni Muttoni (f), Sergio Chiesa (a), Federico Confortini (g), Ramon Egli (f), (a) C.N.R.--Istituto per la Dinamica dei Processi Ambientali, Via Pasubio 3/5, 24044 Dalmine, Italy (b) Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland (c) Dipartimento delle Risorse Naturali e Culturali, Universita´ di Ferrara, Corso Porta Mare 2, 44100 Ferrara, Italy (d) Dipartimento di Geologia, Paleontologia e Geofisica, Universita´ di Padova, Via Giotto 1, 35100 Padova, Italy (e) Dipartimento di Scienze della Terra, Universita´ di Torino, Via Accademia delle Scienze 5, 10123 Torino, Italy (f) ETH, Institut fu¨r Geophysik, Ho¨nggerberg, 8093 Zurich, Switzerland (g) Museo Civico di Scienze Naturali0E. Caffi0, Piazza Cittadella 10, 24129 Bergamo, Italy (literal)
Titolo
  • The lacustrine deposits of Fornaci di Ranica (late Early Pleistocene, Italian Pre-Alps): stratigraphy, palaeonvironmental and geological evolution. (literal)
Abstract
  • An interdisciplinary investigation of the Pleistocene clay succession of Fornaci di Ranica (Italian Pre-Alps) aimed to reconstruct the palaeoenvironmental history and its chronostratigraphic position and to consider the implications for the Quaternary evolution of the southern alpine borderland near the Early/Middle Pleistocene transition. A detailed survey of Quaternary deposits in boreholes and exposed sections provided a complete record of the basin. The most complete core was analyzed for palynology and magnetic properties. Plant macrofossils were obtained by flotation. Pollen and spectrometric analysis allowed a precise stratigraphic placement of a moose antler and braincase kept in museum collections. The basin originated from fluviatile obstruction of a tributary valley cut into bedrock. The basal deposits formed as a terrestrial hydromorphic soil under a dense Tsuga-forest (zone RNC 1). The overlying palustrine gyttja shows a marked forest withdrawal with a climatic signature (zone RNC 3), followed by a re-establishment of mixed conifer forests (zones RNC 4-6). The occurrences of pollen of cold-adapted taxa (Saxifraga oppositifolia type, Saxifraga stellaris type, Larix), are the oldest so far known south of the Alps and suggest that mean summer temperature was near or even below the thermic tree limit. High herb diversity, partially represented by tall forbs, characterizes this zone. A further increase of the water table can be assumed in zones RNC 4 and RNC 5, since pollen of aquatic plants increases. The find of Larix decidua L. cones demonstrates the existence of the European larch in the Early Pleistocene of the Alps, previously not identified at the species level. After the Serio river had reached the maximum Quaternary aggradation, the lake was rapidly filled up with turbiditic sediments. The identification of Cervalces latifrons (Johnson, 1874) by Azzaroli (Palaeantogr. Italica 71(1979) 48) was confirmed. Pollen spectra obtained from clay fragments preserved in the braincase allowed us to constrain the stratigraphic position of these fossil remains in the lower palustrine portion of the sequence. Pollen and moose palaeoecology corroborate the reconstruction of a boreal landscape. The succession of Fornaci di Ranica is attributed to the late Early Pleistocene on the basis of the following elements: (i) the occurrence of an acme pollen zone of Tsuga, with Carya and Pterocarya; (ii) the low representation of Cedrus; (iii) the biochronology of Cervalces latifrons; (iv) normal fossil magnetic polarity, interpreted as part of the Jaramillo subchron on the basis of correlations with other studied sections from the same region, and, finally, (v) indications from the regional geological evolution. The basin deposits spanned the final stage of a temperate period and the subsequent transition to a cold phase during the Jaramillo. (literal)
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