Forebulge migration in the foreland basin system of the central-southern Apennine fold-thrust belt (Italy): New high-resolution Sr-isotope dating constraints

被引：16

作者：

Sabbatino, Monia ^{[1
]}

Tavani, Stefano ^{[1
,2
]}

Vitale, Stefano ^{[1
]}

Ogata, Kei ^{[1
]}

Corradetti, Amerigo ^{[3
]}

Consorti, Lorenzo ^{[1
,7
]}

Arienzo, Ilenia ^{[4
]}

Cipriani, Anna ^{[5
,6
]}

Parente, Mariano ^{[1
]}

机构：

[1] Univ Naples Federico II, DiSTAR, Naples, Italy

[2] CNR, IGAG, Rome, Italy

[3] Univ Trieste, Dept Math & Geosci, Trieste, Italy

[4] Vesuvius Observ, NatL Inst Geophys & Volcanol, Naples, Italy

[5] Univ Modena & Reggio Emilia, Dept Chem & Geol Sci, Modena, Italy

[6] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA

[7] Geol Survey Italy ISPRA, Rome, Italy

来源：

BASIN RESEARCH | 2021年 / 33卷 / 05期

关键词：

central-southern Apennines (Italy); fold-thrust belt; forebulge; foredeep; foreland basin system; strontium isotope stratigraphy; MIOCENE CARBONATE RAMP; DI GRAVINA FORMATION; BACK-ARC EXTENSION; TECTONIC EVOLUTION; CONTINENTAL-CRUST; NORTHERN CALABRIA; MONTE ALPI; STRATIGRAPHY; WESTERN; WATER;

D O I：

10.1111/bre.12587

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Apennines are a retreating collisional belt where the foreland basin system, across large domains, is floored by a subaerial forebulge unconformity developed due to forebulge uplift and erosion. This unconformity is overlain by a diachronous sequence of three lithostratigraphic units made of (a) shallow-water carbonates, (b) hemipelagic marls and shales and (c) siliciclastic turbidites. Typically, the latter two have been interpreted regionally as the onset of syn-orogenic deposition in the foredeep depozone, whereas little attention has been given to the underlying unit. Accordingly, the rate of migration of the central-southern Apennine fold-thrust belt-foreland basin system has been constrained, so far, exclusively considering the age of the hemipelagites and turbidites, which largely post-date the onset of foredeep depozone. In this work, we provide new high-resolution ages obtained by strontium isotope stratigraphy applied to calcitic bivalve shells sampled at the base of the first syn-orogenic deposits overlying the Eocene-Cretaceous pre-orogenic substratum. Integration of our results with published data indicates progressive rejuvenation of the strata sealing the forebulge unconformity towards the outer portions of the fold-thrust belt. In particular, the age of the forebulge unconformity linearly scales with the pre-orogenic position of the analysed sites, pointing to an overall constant migration velocity of the forebulge wave in the last 25 Myr.

引用

页码：2817 / 2836

页数：20