Fault tectonics of the Tuscan Nappe in the eastern sector of the Apuan Alps (Italy)

We present the geological-structural map of the Tuscan Nappe exposed on the eastern border of the Apuan Alps metamorphic dome (Tuscany, Italy). The 1:6,500 scaled Main Map covers an area of about 10 km 2 . It contains the first detailed overview of the fault tectonics affecting the Tuscan Nappe duri...

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Veröffentlicht in:Journal of maps 2020-12, Vol.16 (2), p.745-754
Hauptverfasser: Frassi, Chiara, Ottria, Giuseppe, Ferdeghini, Alessio
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Sprache:eng
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Zusammenfassung:We present the geological-structural map of the Tuscan Nappe exposed on the eastern border of the Apuan Alps metamorphic dome (Tuscany, Italy). The 1:6,500 scaled Main Map covers an area of about 10 km 2 . It contains the first detailed overview of the fault tectonics affecting the Tuscan Nappe during the exhumation and uplift of the Tuscan Metamorphic Units. We documented a polyphase fault tectonics that initially produced low-angle extensional faults and later high-angle faults. The latter started within a transtensional tectonic regime that produced left-lateral strike-slip faults. Lately a pure extensional tensor, indicating a switch of the maximum compression σ1 axis from sub-horizontal to sub-vertical, produced faults with a dominant dip-slip component. In our reconstruction the lateral thickness variations documented in several formations of the Tuscan Nappe is mainly controlled by tectonics and not by stratigraphy, as previously suggested.
ISSN:1744-5647
1744-5647
DOI:10.1080/17445647.2020.1827054