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      An updated reconstruction of basaltic crust emplacement in Tyrrhenian sea, Italy

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      1 , , 2
      Scientific Reports
      Nature Publishing Group UK

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          Abstract

          Basaltic crust is present in the oceans and marginal seas. Oceanic accretion from inception to ending may be usefully recognized in small basin setting like the Tyrrhenian. Alternating episodes of strong and moderate extensional tectonics characterized the small Tyrrhenian opening. Hyperextension (drifting) of late-Miocene and latemost Pliocene age was followed by Pliocene and Late Quaternary moderate extension (rifting). Early hyperextension (~7.5–6.3 Ma) acted in the submerged margin of Hercynian Sardinia. Sardinia offshore, E-directed low-angle faults were accompanied by MORB-like volcanism of non linear shape in the shallow Vavilov plain - inherited segment of alpine-age orogen. Late hyperextension (~1.9–1.7 Ma) acted along the central N-S lineament of Vavilov plain, former metamorphic core complex. At the lineament northern side, E-dipping detachment faulting exposed serpentinized peridotite. At the other side, Vavilov volcano was faulted and its east flank tilted westwards. At the same time, volcanism with affinity to transitional MORB induced opening of Marsili basin. The drift episodes were characterized by absence or scarcity of volcanic activity on the conjugated emerged margins. The rift episodes (respectively ~5–1.9 Ma, and ~1/0.8 Ma-Recent) saw growth of major north-south trending volcanoes in bathyal area as intense volcanic activity developed on the continental margins.

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                Author and article information

                Contributors
                carlo.savelli@libero.it
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                21 December 2017
                21 December 2017
                2017
                : 7
                : 18024
                Affiliations
                [1 ]ISNI 0000 0001 1940 4177, GRID grid.5326.2, Marine Geologist (retired from Consiglio Nazionale delle Ricerche - CNR), ; Largo G.I. Molina 6, 40138 Bologna, Italy
                [2 ]Ismar-CNR, Via P. Gobetti 101, 40129 Bologna, Italy
                Author information
                http://orcid.org/0000-0002-5098-5907
                Article
                17625
                10.1038/s41598-017-17625-2
                5740153
                29269858
                0eb0903a-62cc-4f83-b175-b72feaa67287
                © The Author(s) 2017

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 14 July 2017
                : 20 November 2017
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