Late Miocene to present exhumation in the Ligurian Alps (Southwest Alps) with evidence for accelerated denudation during the Messinian salinity crisis

Detrital apatite (U-Th)/He and fission-track thermochronometry are applied to constrain the exhumation history of the Ligurian Alps (southwest Alps). Exhumation of the Ligurian Alps is recorded from ca. 11 Ma and continues until present. More than 4 km of exhumation is recorded at an average rate of...

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Bibliographic Details
Published in:Geology (Boulder) 2003-09, Vol.31 (9), p.797-800
Main Authors: Foeken, J. P. T, Dunai, T. J, Bertotti, G, Andriessen, P. A. M
Format: Article
Language:English
Subjects:
(U-Th)/He
absolute age
Alps
apatite
Cenozoic
dates
denudation
Europe
Exhumation
faults
fission-track dating
Geochronology
Geology
He/He
Italy
Liguria Italy
Ligurian Alps
Messinian
Miocene
Mountains
Neogene
neotectonics
paleosalinity
phosphates
rates
Southern Europe
Structural geology
tectonics
Tertiary
Th/U
thermal history
thermochronology
thrust faults
upper Miocene
vertical movements
Western Alps
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Summary:Detrital apatite (U-Th)/He and fission-track thermochronometry are applied to constrain the exhumation history of the Ligurian Alps (southwest Alps). Exhumation of the Ligurian Alps is recorded from ca. 11 Ma and continues until present. More than 4 km of exhumation is recorded at an average rate of 0.4 ± 0.2 mm/yr. Exhumation is accommodated along a north-dipping thrust at the foot of the Ligurian margin. Combined (U-Th)/He and fission-track thermal modeling show a phase of accelerated denudation between 7 and 5 Ma, associated with the base-level drop during the Messinian salinity crisis.
ISSN:0091-7613
1943-2682
DOI:10.1130/G19572.1