The eclogite-facies Monviso ophiolite in the western Alps displays a complex record of Jurassic r... more The eclogite-facies Monviso ophiolite in the western Alps displays a complex record of Jurassic rift-drift, subduction zone, and Cenozoic collision tectonics in its evolutionary history. Serpentinized lherzolites intruded by 163 ± 2 Ma gabbros are exposed in the footwall of a thick shear zone (Baracun shear zone) and are overlain by basaltic lava flows and synextensional sedimentary rocks in the hanging wall. Mylonitic serpentinites with sheared ophicarbonate veins and talc-and-chlorite schist rocks within the Baracun shear zone represent a rock assemblage that formed from seawater-derived hydrothermal fluids percolating through it during intra-oceanic extensional exhumation. A Lower Cretaceous calc-schist, marble, and quartz-schist metasedimentary assemblage unconformably overlies the footwall and hanging-wall units, representing a postextensional sequence. The Monviso ophiolite, Baracun shear zone, and the associated structures and mineral phases represent core complex formation i...
The Southern Apennines chain is a fold-and-thrust belt resulting from the convergence of the Afri... more The Southern Apennines chain is a fold-and-thrust belt resulting from the convergence of the African and European plates and simultaneous roll-back of SE-directed Ionian subduction (Upper Oligocene-Quaternary). Ophiolites in the Southern Apennines are related to northwest subduction of the oceanic lithosphere pertaining to the Ligurian sector of the Jurassic western Tethys. The ophiolitic sequences are enclosed within remnants of the
ODP Leg 206 successfully accomplished the initial phase of a multi-leg drilling program that aims... more ODP Leg 206 successfully accomplished the initial phase of a multi-leg drilling program that aims to sample a complete section of upper oceanic crust through the extrusive lavas, the sheeted dike complex, and into the gabbros. Drilling was conducted at Site 1256 (6.7N, 91.9W), which resides on 15-Ma oceanic lithosphere of the Cocos plate that was created by superfast seafloor spreading (~220 mm/yr). Two holes, 1256C and 1256D were drilled into the basement to a depth of 340.3 mbsf (89.6 m sub-basement) and 752 mbsf (502 m sub-basement) respectively. The main stratigraphy of upper oceanic crust at Site 1256 consists of a sequence of massive flows and thin sheet flows with minor amounts of pillow basalts and breccias. The sequence is slightly altered and has N-MORB composition. Structural analysis carried out on board on the recovered cores from both Holes 1256C and 1256D revealed the occurrence of primary igneous as well as post-magmatic structures. Primary igneous features include m...
Geological Society, London, Special Publications, 1998
... M. AYADI l, PA PEZARD 1, C. LAVERNE 1 & G. BRONNER 2 t P~trologie Magmatique, CNRS (U... more ... M. AYADI l, PA PEZARD 1, C. LAVERNE 1 & G. BRONNER 2 t P~trologie Magmatique, CNRS (UMR 6635), CEREGE, BP80, 13545 Aix-en-Provence, France 2 Labora toire de G~ophysique-G{odynamique, Universitd d'A ix-Marseille III, Facult~ des Sciences de Saint-Jdrdme ...
... (LEG 206)1 Christine Laverne,2 Paola Tartarotti,3 Olivier Grauby,4 and Anthony Charles Sianto... more ... (LEG 206)1 Christine Laverne,2 Paola Tartarotti,3 Olivier Grauby,4 and Anthony Charles Siantonas5 INTRODUCTION ... Marcel Bohn, Damon Teagle, Dave Vanko, and the Leg 206 pe-trologists are thanked for their help. T8. Calcium carbonates, p. 18. Page 5. ...
The eclogite-facies Monviso ophiolite in the western Alps displays a complex record of Jurassic r... more The eclogite-facies Monviso ophiolite in the western Alps displays a complex record of Jurassic rift-drift, subduction zone, and Cenozoic collision tectonics in its evolutionary history. Serpentinized lherzolites intruded by 163 ± 2 Ma gabbros are exposed in the footwall of a thick shear zone (Baracun shear zone) and are overlain by basaltic lava flows and synextensional sedimentary rocks in the hanging wall. Mylonitic serpentinites with sheared ophicarbonate veins and talc-and-chlorite schist rocks within the Baracun shear zone represent a rock assemblage that formed from seawater-derived hydrothermal fluids percolating through it during intra-oceanic extensional exhumation. A Lower Cretaceous calc-schist, marble, and quartz-schist metasedimentary assemblage unconformably overlies the footwall and hanging-wall units, representing a postextensional sequence. The Monviso ophiolite, Baracun shear zone, and the associated structures and mineral phases represent core complex formation i...
The Southern Apennines chain is a fold-and-thrust belt resulting from the convergence of the Afri... more The Southern Apennines chain is a fold-and-thrust belt resulting from the convergence of the African and European plates and simultaneous roll-back of SE-directed Ionian subduction (Upper Oligocene-Quaternary). Ophiolites in the Southern Apennines are related to northwest subduction of the oceanic lithosphere pertaining to the Ligurian sector of the Jurassic western Tethys. The ophiolitic sequences are enclosed within remnants of the
ODP Leg 206 successfully accomplished the initial phase of a multi-leg drilling program that aims... more ODP Leg 206 successfully accomplished the initial phase of a multi-leg drilling program that aims to sample a complete section of upper oceanic crust through the extrusive lavas, the sheeted dike complex, and into the gabbros. Drilling was conducted at Site 1256 (6.7N, 91.9W), which resides on 15-Ma oceanic lithosphere of the Cocos plate that was created by superfast seafloor spreading (~220 mm/yr). Two holes, 1256C and 1256D were drilled into the basement to a depth of 340.3 mbsf (89.6 m sub-basement) and 752 mbsf (502 m sub-basement) respectively. The main stratigraphy of upper oceanic crust at Site 1256 consists of a sequence of massive flows and thin sheet flows with minor amounts of pillow basalts and breccias. The sequence is slightly altered and has N-MORB composition. Structural analysis carried out on board on the recovered cores from both Holes 1256C and 1256D revealed the occurrence of primary igneous as well as post-magmatic structures. Primary igneous features include m...
Geological Society, London, Special Publications, 1998
... M. AYADI l, PA PEZARD 1, C. LAVERNE 1 & G. BRONNER 2 t P~trologie Magmatique, CNRS (U... more ... M. AYADI l, PA PEZARD 1, C. LAVERNE 1 & G. BRONNER 2 t P~trologie Magmatique, CNRS (UMR 6635), CEREGE, BP80, 13545 Aix-en-Provence, France 2 Labora toire de G~ophysique-G{odynamique, Universitd d'A ix-Marseille III, Facult~ des Sciences de Saint-Jdrdme ...
... (LEG 206)1 Christine Laverne,2 Paola Tartarotti,3 Olivier Grauby,4 and Anthony Charles Sianto... more ... (LEG 206)1 Christine Laverne,2 Paola Tartarotti,3 Olivier Grauby,4 and Anthony Charles Siantonas5 INTRODUCTION ... Marcel Bohn, Damon Teagle, Dave Vanko, and the Leg 206 pe-trologists are thanked for their help. T8. Calcium carbonates, p. 18. Page 5. ...
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