Abstract
ABSTRACTThe study area is located in the Alpi Apuane (Tuscany, Italy), and extends between N 44°0′49.883″–E 10°20′23.467″ (SW corner) and N 44°2′53.403″–E 10°23′19.175″ (NE corner). The area shows a pile of tectonic units belonging either to the Apuane metamorphic complex, and Tuscan Nappe, stacked during the Alpine orogeny. The latter is represented by a sedimentary Triassic-Miocene succession, and it is characterized by a large-scale east-dipping monocline, with local excision of stratigraphic terms due to the occurrence of intra-unit low-angle normal faults. The Apuane metamorphic complex is formed by Paleozoic phyllites, post-Variscan magmatic rocks (Fornovolasco Metarhyolite Fm.), and Mesozoic-Tertiary metasedimentary formations. The 1:5000 scale geological map and the cross-sections illustrate the tectonic setting of the Fornovolasco area, resulting from the Tertiary tectono-metamorphic events. In the Fornovolasco area, small Tl-rich pyrite + magnetite ore bodies occur close to the contacts between the Paleozoic basement and the cover metasedimentary formations.
Highlights
The Apuane metamorphic complex is formed by Paleozoic phyllites, post-Variscan magmatic rocks (Fornovolasco Metarhyolite Fm.), and Mesozoic-Tertiary metasedimentary formations
The Fornovolasco area is located in the Alpi Apuane (NW Tuscany, Italy), where formations belonging to the Tuscan Nappe and the Apuane metamorphic complex outcrop
The most recent study of the Fornovolasco area was performed by Pandeli et al (2004) who examined the nature of the so-called Fornovolasco schists, a debated pre-Norian formation of uncertain stratigraphic setting
Summary
The Fornovolasco area is located in the Alpi Apuane (NW Tuscany, Italy), where formations belonging to the Tuscan Nappe and the Apuane metamorphic complex outcrop. The attention of several generations of geologists was focused on this sector of the Alpi Apuane, owing to the occurrence of several intriguing geological structures as well as ore deposits, mainly represented by pyrite ± baryte ± iron oxide ore bodies. This type of mineralization is preferentially hosted within the Paleozoic basement or close to the contact between the schists of the basement and the Triassic metadolostone of the Grezzoni Fm. The aim of this new mapping is manifold It aims to improve the knowledge about this sector of the Alpi Apuane metamorphic complex, giving a reference framework for both the pyrite + magnetite ore deposits and the meter to decameter-sized metarhyolite lenses cropping out in the Fornovolasco area
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