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| Petrochemistry of serpentinized peridotite from the Iberia Abyssal Plain (ODP Leg 173): its character intermediate...Petrochemistry of serpentinized peridotite from the Iberia Abyssal Plain (ODP Leg 173): its character intermediate...margin were sampled from the southern Iberia Abyssal Plain (Ocean Drilling Program Leg 173), and the primary...extraction of the sample as measured by the Cr-number of spinel. The trend of the peridotites' mineral chemistry...character of the Iberia Abyssal Plain peridotite is intermediate between those of abyssal peridotites and |
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| data on magmatic rocks obtained from the Iberia Abyssal Plain and from the Gorringe Bank, combined with...zones were sampled along East-West transects of the ocean-continent transition, immediately West or at the...The mantle sections exposed at both the Iberia Abyssal Plain and the Gorringe Bank are clearly different...GPa ( ~ 24 km depth) at Galicia Bank and Iberia Abyssal Plain are estimated from Al-rich pyroxenes and...metamorphic spinels in the sheared gabbros (Iberia Abyssal Plain). These gabbros are interpreted as deriving |
 | CHAZOT, GILLES, CHARPENTIER, SOPHIE, KORNPROBST, JACQUES, VANNUCCI, RICCARDO, LUAIS, BÉATRICE (2005) Lithospheric Mantle Evolution during Continental Break-Up: The West Iberia Non-Volcanic Passive Margin. Journal of Petrology, 46 (12) 2527-2568 doi:10.1093/petrology/egi064 | Journal (article/letter/editorial) |
| Evolution during Continental Break-Up: The West Iberia Non-Volcanic Passive Margin GILLES CHAZOT1*, SOPHIE...gabbros) rocks exposed at the sea-floor along the West Iberia continental margin represent a rare opportunity...igneous rocks are enriched in LREE, unlike North Atlantic MORB. A correlation between their 143Nd/144Nd...patterns with concentrations higher than those of abyssal peridotites. Clinopyroxenes in the harzburgites...Mantle) whereas the clinopyroxenes in the Iberia Abyssal Plain websterites have low-Nd isotopic compositions |
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| com/locate/epsl High degrees of melt extraction recorded by spinel harzburgite of the Newfoundland margin: The role...consequences for the evolution of the southern North Atlantic Othmar Müntener a,⁎, Gianreto Manatschal b a ...Editor: R.D. van der Hilst Abstract Serpentinized spinel peridotites of the Newfoundland margin drilled...mineral compositions similar to the most depleted abyssal peridotites worldwide and different from those...in-situ basement, and are mostly mylonitic cpx-poor spinel harzburgites with Cr-rich spinels (Cr#0.35–0.66) |
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| gabbros at non-volcanic margins: ODP Leg 173 West Iberia ocena-continent transition zone Réjean Hébert,...gabbros at non-volcanic margins: ODP Leg 173 West Iberia ocean-continent transition zone REJEAN HI'BERT 1,...drilled during Leg 173 of the Ocean Drilling Program (ODP) in the ocean-continent transition zone of the...the Iberia Abyssal Plain. Peridotites show contrasting petrographic characteristics. Hole 1068A peridotites...environment post-dating the 120 Ma magmatic stage. Ocean Drilling Program (ODP) Leg 173 (April-June 1997) |
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| 12, 2015 Compressional structures on the West Iberia rifted margin: controls on their distribution G... Southampton, SO14 3ZH, UK Abstract: The West Iberia margin is a magma-poor rifted margin that resulted...rifting leading to the opening of the North Atlantic Ocean. The Mesozoic rift structures were overprinted...Miocene times resulting from collision between Iberia, Europe and Africa. The effects of these compressive...deformation structures throughout the Southern Iberia Abyssal Plain (408– 418N, 118 –138W) on the basis of an |
 | Picazo, S., Müntener, O., Manatschal, G., Bauville, A., Karner, G., Johnson, C. (2016) Mapping the nature of mantle domains in Western and Central Europe based on clinopyroxene and spinel chemistry: Evidence for mantle modification during an extensional cycle. Lithos, 266. 233-263 doi:10.1016/j.lithos.2016.08.029 | Journal (article/letter/editorial) |
| Western and Central Europe based on clinopyroxene and spinel chemistry: evidence for mantle modification during...Western and Central Europe based on clinopyroxene and spinel chemistry: evidence for mantle modification during...Western and Central Europe based on clinopyroxene and spinel chemistry: evidence for SC RI PT mantle modification...Pyrenean domain, the Dinarides and Hellenides and the Iberia-Newfoundland rifted margins. These differences...clinopyroxene from the inherited domain equilibrated in the spinel peridotite field and are too enriched in Na2O and |
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| 2015 Observations from the Alpine Tethys and Iberia – Newfoundland margins pertinent to the interpretation...Southampton SO14 3ZH, UK Abstract: Although the Iberia–Newfoundland and Alpine Tethys margins are of different...summarize the pertinent geological observations for the Iberia–Newfoundland and Alpine Tethys margins. We describe...during progressive lithospheric extension. For the Iberia– Newfoundland and Alpine Tethys margins initial...observations from the Alpine Tethys (Fig. 1) and Iberia – Newfoundland margins (Fig. 2). The aim of this |
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| magmatism prior to continental break-up in the North Atlantic and geodynamic implications Urs Scha«rer a; *...and Gorringe banks and in the Iberia Abyssal Plain of the North Atlantic, unroofed subcontinental mantle...Based on the new results, a structural model for Iberia^America rifting is discussed putting forward the...magmatism; U/Pb; absolute age; hafnium; isotopes; North Atlantic * Corresponding author. Tel.: +33-1-44-27-28-20;...documented, in particular for cases such as the Iberia margin, where riftrelated volcanism is absent on |
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| the Mesozoic successions of the Alps and western Iberia R.C.L. WILSON 1, G. MANATSCHAL2'3 & S. WISE 4 ...basins that evolved in deep marine settings near the ocean-continent transition. It focuses on the applicability...evidence obtained from Ocean Drilling Program holes drilled in the Iberia Abyssal Plain. Despite the fact...of syn-rift intervals in distal basins off West Iberia and in the Southern Alps have not demonstrated...turbiditic sediments. Drilling results from the Iberia Abyssal Plain suggest a similar age because Tithonian |
 | Mata, J., Alves, C.F., Martins, L., Miranda, R., Madeira, J., Pimentel, N., Martins, S., Azevedo, M.R., Youbi, N., De Min, A., Almeida, I.M., Bensalah, M.K., Terrinha, P. (2015) 40Ar/39Ar ages and petrogenesis of the West Iberian Margin onshore magmatism at the Jurassic–Cretaceous transition: Geodynamic implications and assessment of open-system processes involving saline materials. Lithos, 236. 156-172 doi:10.1016/j.lithos.2015.09.001 | Journal (article/letter/editorial) |
| important extensional event associated with the Iberia-Newfoundland rifting. The related lithospheric...to the birth of the Atlantic Ocean. With the progressive opening of the Atlantic, Mesozoic sedimentary...beginning of the TE D Central Atlantic opening and a part of the Central Atlantic Magmatic Province (CAMP;...and the associated counter-clockwise rotation of Iberia, as well as of AC the occurrence of significant...al., 2006; Merle et al., 2009) and at Northeast Iberia (e.g., Ubide et al., 2014). Less well known is |
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| present in this area during the opening of the Atlantic Ocean. No evidence of continental material that ...chemistry during the early stages of formation of the Atlantic oceanic crust in this area. Strongly depleted...beneath Fuerteventura implies that the continent–ocean transition in the Canary Islands area must be relatively...non-volcanic margins (examples include the Iberia Abyssal Plain: e.g. Boillot et al. 1989; Whitmarsh and...transitional ocean-continent margins are the west Iberia margin, where an 80 to 130-km-wide ocean–continent |
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| lithosphere are examined: one in the Newfoundland– Iberia rift and one at Goban Spur (both exhumed mantle)...lithosphere in three locations: (1) the Newfoundland–Iberia rift and (2) Goban Spur areas where transitional...serpentinized during exhumation; and (3) the central South Atlantic where transitional lithosphere may consist of...Exhumed mantle: the Newfoundland – Iberia rift The Newfoundland–Iberia rift (Fig. 1) is by far the best-known...Fig. 1. Plate reconstruction of the Newfoundland –Iberia rift at chron M0 (125 Ma on the Gradstein et al |
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| zone (up to ∼100km wide), called the continent– ocean transition (COT). Using dynamical models of rifting...observations at the West Iberia margin (WIM) and the ancient margins of the Liguria-Piemonte Ocean (LP) now exposed...trapped in the mantle, as in slow-spreading mid-ocean ridges, still more melt is produced in the models...reserved. Keywords: non-volcanic margins; continent–ocean transition; melting; numerical modelling 1. Introduction...of the mantle along a wide zone, the continent–ocean transition (COT), which occurs before normal oceanic |
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| serpentinisation and mantle exhumation at the ocean^continent transition, Iberia: constraints from oxygen isotopes...149 of the Ocean Drilling Program profiled a zone of exhumed mantle peridotite at the ocean^continent...ocean^continent transition (OCT) beneath the Iberia Abyssal Plain. The zone of exhumed peridotite appears to be tens...of continental crust and the first products of ocean accretion. Exhumed peridotite is 95^100% serpentinised...oxygen; isotopes; £uid dynamics 1. Introduction The ocean^continent transition (OCT) is de¢ned as the zone |
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| (vs. standard mean ocean chlorine, SMOC) from a core at the Iberian Abyssal Plain, and +0.16x from a...Introduction The long-term exospheric1 chlorine budget and ocean salinity must be controlled by transfer to and from...chlorine to the crustal reservoir comes from mid-ocean ridges and volcanic centers [2–5] and returns by...concentrations were measured in serpentinites from Ocean Drilling Project (ODP) cores and found to be uniformly...help to stabilize the Cl concentration of the ocean. The subductionrelated breakdown of serpentinite |
 | Pinto, Victor Hugo G., Manatschal, Gianreto, Karpoff, Anne Marie, Ulrich, Marc, Viana, Adriano R. (2017) Seawater storage and element transfer associated with mantle serpentinization in magma-poor rifted margins: A quantitative approach. Earth and Planetary Science Letters, 459. 227-237 doi:10.1016/j.epsl.2016.11.023 | Journal (article/letter/editorial) |
| transfer water storage magma-poor rifted margins ocean continent transitions a b s t r a c t Continental...process of serpentinization within the evolving ocean may have the potential to change: (i) seawater chemistry;...exhumed continental mantle, slow spreading mid-ocean ridges as well as sampled in ophiolites have allowed...complexes located at slow to ultraslow spreading mid-ocean ridges, have also showed that serpentinization is...drill hole data following the Ocean Drilling Program (ODP) along the Iberia margin (e.g. Gibson et al., |
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| magma-poor rifted margins: an example from the West Iberia –Newfoundland conjugate margins MARTA PÉREZ-GUSSINYÉ...margins are characterized by a wide continent –ocean transition and anomalously small fractions of magmatism...on the West Iberia Margin (WIM)–Newfoundland (NF) conjugates in the North Atlantic Ocean. The architectural...Hyperextended margins are characterized by a wide continent–ocean transition and anomalously small fractions of magmatism...Porcupine, Rockall, More, Vøring and West Orphan North Atlantic basins, once interpreted as magmatic underplating |
 | DEAN, S, MURTON, B, MINSHULL, T, HENSTOCK, T, WHITE, R (2009) An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions. Earth and Planetary Science Letters, 278 (1) 26-39 doi:10.1016/j.epsl.2008.11.012 | Journal (article/letter/editorial) |
| spreading ridges and rifted margins in the North Atlantic indicates that rift duration and synrift mantle...seaward dipping reflector sequences on the continent-ocean transition. Examples of both intrusive and extrusive...studies and by direct sampling in the southern Iberia Abyssal Plain (e.g., (Dean et al., 1999); (Whitmarsh et...syn-rift volcanic products from around the North Atlantic margin with those predicted by our model and hence...mantle, accommodating melting in both the garnet and spinel lherzolite fields (e.g. (Prinzhofera and Allègre |
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| of basalts and gabbros from an ancient continent–ocean transition (External Liguride ophiolites, Northern...October 2007 Abstract Remnants of a fossil continent–ocean transition similar to that of the modern non-volcanic...low-degree (≤6%) fractional melting of a depleted spinel peridotite cannot account for the elevated Sm/Yb...basalts. Lowdegree melting of a mixed source of spinel peridotite with small amounts of garnet pyroxenite...2007 Elsevier B.V. All rights reserved. Keywords: Ocean–continent transition; Ophiolites; Northern Apennine; |
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| Serpentinite Occurrences in the Oceans: Mantle-Ocean Interactions in the Plate Tectonic Cycle Patricia...Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of...regional scales as continental rifts open and new ocean basins form. The process of seawater incursion deep...into faulted oceanic crust at slow-spreading mid-ocean ridges during periodic amagmatic phases produces...supposed. Serpentinite may form at the ends of mid-ocean rift segments as a consequence of low-angle faulting |
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| Rifting Hyperextended rifted margins Alpine Tethys Iberia–Newfoundland Numerical modeling a b s t r a c...are the Alpine Tethys, Pyrenean–Bay of Biscay and Iberia–Newfoundland rift systems. However, as all these...the development of the magma-poor southern North Atlantic and Alpine Tethys rift systems and that the role...hyperextended rift systems of the southern North Atlantic and Alpine Tethys can be translated to other less...Manatschal and Bernoulli, 1998). In the North Atlantic (Lundin and Doré, 2011) and the NW Shelf of Australia |
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| exhumation of serpentinized mantle rocks in a fossil Ocean Continent Transition: The Totalp unit in SE Switzerland...29 May 2013 Keywords: Alpine Tethys Totalp unit Ocean Continent Transition Serpentinite gouges and cataclasites...evolution of exhumed serpentinized peridotites Iberia margin a b s t r a c t Although the exhumation...rocks in slow and ultraslow spreading Mid-Ocean Ridges and Ocean Continent Transitions (OCTs) has been extensively...shallow basement at slow spreading Mid Ocean Ridges (MORs) and at Ocean Continent Transitions (OCTs) along |
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| margins (e.g., the Western Iberia margin, [1] and references therein) and at Mid-Ocean Ridges (MORs; e.g., [2...an environment favoring microbial development (Ocean Drilling Program (ODP) Leg 149 Site 897; [25])....hydrothermal systems exist at MORs such as the Mid-Atlantic Ridge (MAR; Kane Fracture Zone [26]; 15◦ N [27])...[27]) and in passive margins (e.g., Western Iberia margin; [25]). Fossil systems are also found in mountain...International Ocean Discovery Program (IODP) site 1277 Here, we study samples from the International Ocean Discovery |
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| revisited: mantle exhumation and magmatism along an ocean-continent transition: the Platta nappe, eastern...by eNd values typical for an asthenospheric mid-ocean ridge-type source of the melts. They may be the...the axial part of the 'geosyncline' and the deep ocean floor. Although Steinmann considered diabase, spilite...onto the serpentinites previously exposed on the ocean floor (Fig. 1; Decandia & Elter 1972; Lagabrielle...Generalized stratigraphy of transitional crust (ocean-continent transition) in the Platta nappe, eastern |
