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Breaking up continents at magma-poor rifted margins: a seismic v. outcrop perspective

View ORCID ProfileA. Decarlis, M. Gillard, R. Tribuzio, View ORCID ProfileM. E. Epin and G. Manatschal
Journal of the Geological Society, 175, 875-882, 10 August 2018, https://doi.org/10.1144/jgs2018-041
A. Decarlis
1IPGS/EOST, Université de Strasbourg-CNRS, Rue Blessig, 1, F-67084 Strasbourg Cedex, France
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M. Gillard
1IPGS/EOST, Université de Strasbourg-CNRS, Rue Blessig, 1, F-67084 Strasbourg Cedex, France
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R. Tribuzio
2Dipartimento di Scienze della Terra e dell'Ambiente, Università degli Studi di Pavia, Via Ferrata, 1, 27100 Pavia, Italy
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M. E. Epin
1IPGS/EOST, Université de Strasbourg-CNRS, Rue Blessig, 1, F-67084 Strasbourg Cedex, France
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  • ORCID record for M. E. Epin
G. Manatschal
1IPGS/EOST, Université de Strasbourg-CNRS, Rue Blessig, 1, F-67084 Strasbourg Cedex, France
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Abstract

The break-up of continents at magma-poor rifted margins is a complex yet little understood process accounting for intricate interactions between tectonic and magmatic processes. Whereas high-resolution seismic data may resolve the first-order architecture of ocean–continent transitions (OCTs), direct access to rocks remains limited to deep-sea drilling. In this study, we combine seismic observations from the East Antarctica margin (Geoscience Australia Survey 228) with field observations from the Bracco–Levanto area (Northern Apennines, Italy), representing modern and fossil examples of ultra-distal magma-poor rifted margins respectively. The combination of detailed structural mapping and petrological studies from fossil examples with architectural features observed in seismic sections from present-day OCTs enables to bridge the different observation scales. Field evidence indicates that the magmatic budget is not zero, as magma is present throughout the exhumation process. Extensional detachment faults that exhumed serpentinized mantle and deep-seated gabbro intrusions are truncated by later high-angle normal faults, which most probably acted as feeders for the emplacement of massive syn-extensional basalts. These observations suggest a polyphase tectonic and magmatic evolution of the ultra-distal margin prior to the formation of the first true oceanic crust, which can be studied in detail only by combining seismic and outcrop observations.

  • © 2018 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 175 (6)
Journal of the Geological Society
Volume 175, Issue 6
November 2018
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Breaking up continents at magma-poor rifted margins: a seismic v. outcrop perspective

A. Decarlis, M. Gillard, R. Tribuzio, M. E. Epin and G. Manatschal
Journal of the Geological Society, 175, 875-882, 10 August 2018, https://doi.org/10.1144/jgs2018-041
A. Decarlis
1IPGS/EOST, Université de Strasbourg-CNRS, Rue Blessig, 1, F-67084 Strasbourg Cedex, France
  • Find this author on Google Scholar
  • Find this author on PubMed
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  • ORCID record for A. Decarlis
  • For correspondence: [email protected]
M. Gillard
1IPGS/EOST, Université de Strasbourg-CNRS, Rue Blessig, 1, F-67084 Strasbourg Cedex, France
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R. Tribuzio
2Dipartimento di Scienze della Terra e dell'Ambiente, Università degli Studi di Pavia, Via Ferrata, 1, 27100 Pavia, Italy
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M. E. Epin
1IPGS/EOST, Université de Strasbourg-CNRS, Rue Blessig, 1, F-67084 Strasbourg Cedex, France
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  • ORCID record for M. E. Epin
G. Manatschal
1IPGS/EOST, Université de Strasbourg-CNRS, Rue Blessig, 1, F-67084 Strasbourg Cedex, France
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Breaking up continents at magma-poor rifted margins: a seismic v. outcrop perspective

A. Decarlis, M. Gillard, R. Tribuzio, M. E. Epin and G. Manatschal
Journal of the Geological Society, 175, 875-882, 10 August 2018, https://doi.org/10.1144/jgs2018-041
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