Birth of an ocean in the Red Sea: Oceanic-type ...
Document type :
Article dans une revue scientifique: Article original
DOI :
Title :
Birth of an ocean in the Red Sea: Oceanic-type basaltic melt intrusions precede continental rupture
Author(s) :
Ligi, Marco [Auteur]
Alma Mater Studiorum Università di Bologna = University of Bologna [UNIBO]
Istituto di Scienze Marine [Bologna] [ISMAR]
Bonatti, Enrico [Auteur]
Lamont-Doherty Earth Observatory [LDEO]
Alma Mater Studiorum Università di Bologna = University of Bologna [UNIBO]
Istituto di Scienze Marine [Bologna] [ISMAR]
Bosworth, William [Auteur]
Cai, Yue [Auteur]
Lamont-Doherty Earth Observatory [LDEO]
Cipriani, Anna [Auteur]
Lamont-Doherty Earth Observatory [LDEO]
Università degli Studi di Modena e Reggio Emilia = University of Modena and Reggio Emilia [UNIMORE]
Palmiotto, Camilla [Auteur]
Istituto di Scienze Marine [Bologna] [ISMAR]
Ronca, Sara [Auteur]
Università degli Studi di Roma "La Sapienza" = Sapienza University [Rome] [UNIROMA]
Seyler, Monique [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université Lille Nord (France)
Alma Mater Studiorum Università di Bologna = University of Bologna [UNIBO]
Istituto di Scienze Marine [Bologna] [ISMAR]
Bonatti, Enrico [Auteur]
Lamont-Doherty Earth Observatory [LDEO]
Alma Mater Studiorum Università di Bologna = University of Bologna [UNIBO]
Istituto di Scienze Marine [Bologna] [ISMAR]
Bosworth, William [Auteur]
Cai, Yue [Auteur]
Lamont-Doherty Earth Observatory [LDEO]
Cipriani, Anna [Auteur]
Lamont-Doherty Earth Observatory [LDEO]
Università degli Studi di Modena e Reggio Emilia = University of Modena and Reggio Emilia [UNIMORE]
Palmiotto, Camilla [Auteur]
Istituto di Scienze Marine [Bologna] [ISMAR]
Ronca, Sara [Auteur]
Università degli Studi di Roma "La Sapienza" = Sapienza University [Rome] [UNIROMA]
Seyler, Monique [Auteur]

Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université Lille Nord (France)
Journal title :
Gondwana Research
Pages :
150 - 160
Publisher :
Elsevier
Publication date :
2018
ISSN :
1342-937X
English keyword(s) :
Rifting
Magmatic intrusions
Continental rupture
Seafloor spreading initiation
Northern Red Sea
Magmatic intrusions
Continental rupture
Seafloor spreading initiation
Northern Red Sea
HAL domain(s) :
Planète et Univers [physics]/Sciences de la Terre/Géophysique [physics.geo-ph]
English abstract : [en]
The role of magmatism in continental rupture at the birth of a new ocean is poorly understood. Continental rupture can take place with voluminous volcanism, as in the southern Red Sea, or in a relatively non-volcanic mode, ...
Show more >The role of magmatism in continental rupture at the birth of a new ocean is poorly understood. Continental rupture can take place with voluminous volcanism, as in the southern Red Sea, or in a relatively non-volcanic mode, as in the northern Red Sea. We report geophysical, geochemical and geochronological evidence suggesting that continental rupture in the northern Red Sea is preceded by MORB-type basaltic melt intrusions that cooled at depth forming gabbros at progressively shallower crustal levels as rifting progressed towards continental separation. One of these gabbros yielded an 40 Ar/ 39 Ar age of 25 ± 6 Ma, suggesting intrusion during early rifting. A magma chamber we detected 3.5 km below Thetis Deep, an axial segment of initial oceanic crust accretion, represents the final stage in this progression. Oceanic crust accretion in the Red Sea rift starts first at depth before continental rupture and initiation of sea floor spreading.Show less >
Show more >The role of magmatism in continental rupture at the birth of a new ocean is poorly understood. Continental rupture can take place with voluminous volcanism, as in the southern Red Sea, or in a relatively non-volcanic mode, as in the northern Red Sea. We report geophysical, geochemical and geochronological evidence suggesting that continental rupture in the northern Red Sea is preceded by MORB-type basaltic melt intrusions that cooled at depth forming gabbros at progressively shallower crustal levels as rifting progressed towards continental separation. One of these gabbros yielded an 40 Ar/ 39 Ar age of 25 ± 6 Ma, suggesting intrusion during early rifting. A magma chamber we detected 3.5 km below Thetis Deep, an axial segment of initial oceanic crust accretion, represents the final stage in this progression. Oceanic crust accretion in the Red Sea rift starts first at depth before continental rupture and initiation of sea floor spreading.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
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