Fission-track dating on detrital apatites from modern sands of the Po Delta is used for a provenance study of sediments in the Po River basin. Analysed samples show a fission-track grain-age distribution characterized by two prominent peaks at 7.7 Ma and 17 Ma. The youngest peak accounts for 46% of the total population of dated grains. This young component in the grain-age distribution is consistent with bedrock cooling ages observed in the Western Alps between the External Massifs and the Houiller unit, as well as in the Lepontine dome of the Central Alps and in the Miocene foredeep units of the Apennines, that overall represent only 12% of the orogenic source area. Results suggest that most of the sediment load in the last 10(2)-10(5) years was supplied by focused erosion of relatively small areas that experienced short-term erosion rates one order of magnitude higher than in the rest of the.

Malusa', M., Zattin, M., Ando', S., Garzanti, E., Vezzoli, G. (2009). Focused erosion in the Alps constrained by fission-track ages on detrital apatites. In F. Lisker, B. Ventura, U.A. Glasmacher (a cura di), Thermochronological methods: from palaeotemperature constraints to landscape evolution models (pp. 141-152). GEOLOGICAL SOC PUBLISHING HOUSE [10.1144/SP324.11].

Focused erosion in the Alps constrained by fission-track ages on detrital apatites

MALUSA', MARCO GIOVANNI
;
ANDO', SERGIO;GARZANTI, EDUARDO;VEZZOLI, GIOVANNI
2009

Abstract

Fission-track dating on detrital apatites from modern sands of the Po Delta is used for a provenance study of sediments in the Po River basin. Analysed samples show a fission-track grain-age distribution characterized by two prominent peaks at 7.7 Ma and 17 Ma. The youngest peak accounts for 46% of the total population of dated grains. This young component in the grain-age distribution is consistent with bedrock cooling ages observed in the Western Alps between the External Massifs and the Houiller unit, as well as in the Lepontine dome of the Central Alps and in the Miocene foredeep units of the Apennines, that overall represent only 12% of the orogenic source area. Results suggest that most of the sediment load in the last 10(2)-10(5) years was supplied by focused erosion of relatively small areas that experienced short-term erosion rates one order of magnitude higher than in the rest of the.
Capitolo o saggio
detrital geochronology, fission tracks, modern sands, Alps
English
Thermochronological methods: from palaeotemperature constraints to landscape evolution models
Lisker, F; Ventura, B; Glasmacher, UA
2009
978-1-86239-285-4
324
GEOLOGICAL SOC PUBLISHING HOUSE
141
152
Malusa', M., Zattin, M., Ando', S., Garzanti, E., Vezzoli, G. (2009). Focused erosion in the Alps constrained by fission-track ages on detrital apatites. In F. Lisker, B. Ventura, U.A. Glasmacher (a cura di), Thermochronological methods: from palaeotemperature constraints to landscape evolution models (pp. 141-152). GEOLOGICAL SOC PUBLISHING HOUSE [10.1144/SP324.11].
none
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/5238
Citazioni
  • Scopus 20
  • ???jsp.display-item.citation.isi??? 20
Social impact