The Mesozoic continental rifting in the Mediterranean area: insights from the Verrucano tectofacies of southern Tuscany (Northern Apennines, Italy)

被引：35
作者：
Aldinucci, Mauro [1 ]
Gandin, Anna [1 ]
Sandrelli, Fabio [1 ]
机构：
[1] Univ Siena, Dept Earth Sci, I-53100 Siena, Italy
来源：
INTERNATIONAL JOURNAL OF EARTH SCIENCES | 2008年 / 97卷 / 06期
关键词：
Mesozoic continental rifting; Triassic redbeds; Verrucano tectofacies; Northern Apennines; southern Tuscany;
D O I：
10.1007/s00531-007-0208-9
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
In the Alpine-Mediterranean region, the continental redbeds and shallow-marine siliciclastics related to the early depositional phases of the Late Permian-Mesozoic continental rifting are referred to as the most common representative of the "Verrucano tectofacies". The Verrucano-type successions exposed in southern Tuscany are diachronous, spanning from Triassic to earliest Jurassic in age, and accumulated within the Tuscan domain, a paleogeographic region of continental crust that due to the opening of the Piedmont-Ligurian ocean formed part of the Adria passive-margin. They belong to the metamorphic Verrucano Group and the non-metamorphic Pseudoverrucano fm. Viewed overall, these Verrucano-type successions appear to manifest five episodes or pulses of an ongoing continental rifting. With the exception of the first episode that developed entirely within a terrestrial setting, each one is represented by basal Verrucano-type continental siliciclastics overlain by compositionally mixed marine deposits, which resulted from four diachronous, post-Middle Triassic transgressions. This suite of tectonic pulses produced the progressive westward widening (backstepping) of the Tuscan domain in the rifting south-Tuscany area.
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页码：1247 / 1269
页数：23
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