In the southern Apennines fold-and-thrust belt, thermal indicators record exhumation of sedimentary units from depths locally in excess of 5 km. The thrust belt is made of allochthonous sedimentary units that overlie a 6-8-km-thick, carbonate footwall succession. The latter, continuous with the foreland Apulian Platform, is deformed by reverse faults involving the underlying basement. Therefore, a switch from thin-skinned to thick-skinned thrusting occurred as the Apulian Platform carbonates-and the underlying thick continental lithosphere-were deformed during the latest shortening stages. Apatite fission track data, showing cooling ages ranging between 9.2 +/- 1.0 and 1.5 +/- 0.8 Ma, indicate that exhumation marks these late tectonic stages, probably initiating with the buttressing of the allochthonous wedge against the western margin of the Apulian Platform. Pliocene-Pleistocene foreland advancing of the allochthonous units exceeds the total amount of slip that, based on cross-section balancing and restoration, could be transferred to the base of the allochthon from the underlying thick-skinned structures. This suggests that emplacement of the allochthon above the western portion of the Apulian Platform carbonates was followed by gravitational readjustments within the allochthonous wedge, coeval-and partly associated with-thick-skinned shortening at depth. The related denudation processes are interpreted to have played a primary role in tectonic exhumation.

Tectonic burial and "young" (< 10 Ma) exhumation in the southern Apennines fold and thrust belt (Italy) / Mazzoli, Stefano; Derrico, M; Aldega, L; Corrado, S; Invernizzi, C; Shiner, P; Zattin, M.. - In: GEOLOGY. - ISSN 0091-7613. - STAMPA. - 36:(2008), pp. 243-246. [10.1130/G24344A.1]

Tectonic burial and "young" (< 10 Ma) exhumation in the southern Apennines fold and thrust belt (Italy)

MAZZOLI, STEFANO;
2008

Abstract

In the southern Apennines fold-and-thrust belt, thermal indicators record exhumation of sedimentary units from depths locally in excess of 5 km. The thrust belt is made of allochthonous sedimentary units that overlie a 6-8-km-thick, carbonate footwall succession. The latter, continuous with the foreland Apulian Platform, is deformed by reverse faults involving the underlying basement. Therefore, a switch from thin-skinned to thick-skinned thrusting occurred as the Apulian Platform carbonates-and the underlying thick continental lithosphere-were deformed during the latest shortening stages. Apatite fission track data, showing cooling ages ranging between 9.2 +/- 1.0 and 1.5 +/- 0.8 Ma, indicate that exhumation marks these late tectonic stages, probably initiating with the buttressing of the allochthonous wedge against the western margin of the Apulian Platform. Pliocene-Pleistocene foreland advancing of the allochthonous units exceeds the total amount of slip that, based on cross-section balancing and restoration, could be transferred to the base of the allochthon from the underlying thick-skinned structures. This suggests that emplacement of the allochthon above the western portion of the Apulian Platform carbonates was followed by gravitational readjustments within the allochthonous wedge, coeval-and partly associated with-thick-skinned shortening at depth. The related denudation processes are interpreted to have played a primary role in tectonic exhumation.
2008
Tectonic burial and "young" (< 10 Ma) exhumation in the southern Apennines fold and thrust belt (Italy) / Mazzoli, Stefano; Derrico, M; Aldega, L; Corrado, S; Invernizzi, C; Shiner, P; Zattin, M.. - In: GEOLOGY. - ISSN 0091-7613. - STAMPA. - 36:(2008), pp. 243-246. [10.1130/G24344A.1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/107451
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