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| the last 20 years, regional studies on the West Iberia margin and on the former margins of the Tethys...continental rifting and break-up, the location of the ocean-continent boundary, and the possible association...al. 1980; Sibuet et al. 1987), and after three Ocean Drilling Program (ODP) Legs (103, 149, 173; Fig... US and French geophysical surveys on the West Iberia margin, the advance in the understanding of processes...ophicalcites covering ultramafic sea floor in the present ocean and in Alpine ophiolites? What are the respective |
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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 |
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| consequences for the evolution of the southern North Atlantic Othmar Müntener a,⁎, Gianreto Manatschal b a ...mineral compositions similar to the most depleted abyssal peridotites worldwide and different from those...peridotite basement resemble normal to transitional mid-ocean ridge basalt. This, together with the unusually...was exhumed close to the ocean floor during the rifting evolution of the Atlantic. Compared to the spinel...inherited, primary, Ca-richer composition of the Iberia peridotite, or, alternatively, by local melt impregnation |
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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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| in the vicinity of an ocean–continent transition in the West Iberian Abyssal plain. ODP Leg 173, Hole 1067Awas...mechanisms of continental rifting and initiation of ocean basin formation on the West Iberian rifted margin...Geological background The western continental margin of Iberia extends from Cape Finisterre in the north to Cape...Galicia Bank is limited to the west by the Iberia Abyssal Plain. Three main Mesozoic extension episodes...episodes are believed to have affected the western Iberia margin: 1) Triassic to Early Jurassic extension created |
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| amphibolites from Site 1067, ODP Leg 173 (Iberia Abyssal Plain): Jurassic rifting to the Pyrenean compression...the ocean-continent transition (OCT) zone off the West Iberia margin in the Iberia Abyssal Plain. At...metamorphic evolution of the amphibolite ended under ocean-floor conditions. Oxygen isotope ratios and studies...Pyrenean orogeny. Studies of fossil and present-day ocean-continent transition (OCT) zones are of great importance...metamorphic evolution related to the rifting. The West Iberia margin is a good example of a starved nonvolcanic |
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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 |
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| gas hydrate dissociation in response to elevated ocean temperatures (Maslin et al., 1998; Nisbet and Piper...datasets are inferred to come from distal basin plain depositional sequences, featuring minimal erosion...trigger many of the turbidites seen in other basin plain sequences, where volumes can be constrained (Elmore...predominant fraction of turbidites within our basin plain sequences were triggered by landslides. Of the...Aims Our first aim is to test whether rapid global ocean warming at the IETM (∼ 55 Ma) coincides with an |
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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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| from serpentinized peridotites beneath the Iberia Abyssal Plain XIXI ZHAO Center f o r Studies o f lmaging...serpentin- ized peridotite rocks recovered at Ocean Drilling Program (ODP) Leg 149 and 173 sites, off...interpretation of the drilling results for the Iberia margin, our results suggest that the Iberian peridotites...Iberian peridotites at Leg 173 drill sites. The west Iberia margin is a non-volcanic rifted margin characterized...rotation of Iberia against Europe, the SE Grand Banks margin can be matched with the west Iberia margin (Bullard |
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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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| southern Iberia Abyssal Plain L. J. HOPKINSON1,{, S. DEE2 AND C. A. BOULTER1,* 1 School of Ocean and Earth...recovered from beneath the southern Iberia Abyssal Plain (Ocean Drilling Programme Leg 173) provide the...This study examines serpentinized ultrama cs from Ocean Drilling Programme Leg 173, site 1068A. Here, tectonized...diffraction (XRD), all completed at the School of Ocean and Earth Science, Southampton Oceanography Centre...cs by faults (e.g. Krawczyk et al., 1996). The Iberia passive margin is a classic example, where the |
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| margins (e.g., the Western Iberia margin, [1] and references therein) and at Mid-Ocean Ridges (MORs; e.g., [2...responsible for pervasive replacement of serpentine by calcite occur at slow-spreading ridges and in magma-poor...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 |
 | Schwarzenbach, Esther M., Früh-Green, Gretchen L., Bernasconi, Stefano M., Alt, Jeffrey C., Plas, Alessio (2013) Serpentinization and carbon sequestration: A study of two ancient peridotite-hosted hydrothermal systems. Chemical Geology, 351. 115-133 doi:10.1016/j.chemgeo.2013.05.016 | Journal (article/letter/editorial) |
| Keywords: Carbon sequestration Serpentinization Ocean Drilling Program Northern Apennine Iberian Margin...precipitate carbonate, forming an extensive network of calcite veins in the basement rocks, while H2 and CH4 serve...Northern Apennines, and 2) calcite-veined serpentinites from the Iberian Margin (Ocean Drilling Program (ODP)...field (LCHF) on the Atlantis Massif near the Mid-Atlantic Ridge (MAR). Our results show that large amounts...of seawater with ultramafic rocks exposed at the ocean floor results in serpentinization reactions and the |
 | 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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| continental margins (West Iberia and Newfoundland margins, North Atlantic) Duarte M. Soares a,n, Tiago...Terrinha b a b 3D Seismic Lab, School of Earth, Ocean and Planetary Sciences, Main Building, Park Place...Porto Basin, and in deep-offshore regions of West Iberia and Newfoundland (East Canada). The interpreted...time of complete lithospheric breakup between West Iberia and Newfoundland. This surface, usually called...sediment bypassed the inner proximal margins of West Iberia and Newfoundland on their way to the outer proximal |
 | Ludwig, Kristin A., Kelley, Deborah S., Butterfield, David A., Nelson, Bruce K., Früh-Green, Gretchen (2006) Formation and evolution of carbonate chimneys at the Lost City Hydrothermal Field. Geochimica et Cosmochimica Acta, 70 (14) 3625-3645 doi:10.1016/j.gca.2006.04.016 | Journal (article/letter/editorial) |
| City Hydrothermal Field at 30°N, near the Mid-Atlantic Ridge, is an off-axis, moderate temperature, high-pH...precipitation of variable mixtures of aragonite, calcite, and brucite. The resultant deposits range from...conversion of aragonite to calcite, and infilling of pore spaces with calcite. The oldest chimneys are dominated...dominated by calcite, with bulk rock values of up to 36 wt% Ca and <1 wt% Mg. These older structures...prevalent along the MidAtlantic, Arctic, and Indian Ocean ridge networks and it is likely that other Lost |
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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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| determined by XRD method, quartz + dolomite, dolomite + calcite + quartz, dolomite + quartz + magnesite are mainly...lizardite/chrysotile determined by mineralogical examinations, calcite, chlorite, iddingsite and hematite zones indicate...Isotopic studies of δ13C/12C and δ18O/16O ratios of calcite from carbonates and breccia matrix are typical...many rock series thriving in metaperidotites, midocean ridges, subduction zone ophiolites and the fronts...in the north and south tributary of neotethyan ocean. anic areas in MiddleUpper Trias, which is formed |
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| a t e / e p s l Evolution of the Newfoundland–Iberia conjugate rifted margins Alistair Crosby a,⁎, Nicky...debate has focussed on the well-studied Newfoundland–Iberia conjugate margins. We have tackled the problem...controversy has particularly focussed on the Newfoundland–Iberia conjugate margins which have been studied in detail...not, be directly applicable to the Newfoundland–Iberia rift but it is clear that radically different lithospheric...reference column is in isostatic balance with a mid-ocean ridge. Penalty components in the misfit function |
 | Pelletier, Laure, Müntener, Othmar, Kalt, Angelika, Vennemann, Torsten W., Belgya, Tamás (2008) Emplacement of ultramafic rocks into the continental crust monitored by light and other trace elements: An example from the Geisspfad body (Swiss-Italian Alps) Chemical Geology, 255 (1) 143-159 doi:10.1016/j.chemgeo.2008.06.024 | Journal (article/letter/editorial) |
| studied for some years in serpentinites from mid-ocean ridges (Bonatti et al., 1984; Früh-Green et al....serpentinites, Li enrichment is more pronounced than at mid-ocean ridges, and is related to slab-derived fluids released...al., 2004). The Beryllium content of drilled mid-ocean ridge and ophiolitic serpentinites is extremely...(in review)), while the Be content of dredged mid-ocean ridge serpentinites is low but highly variable (Niu...subcontinental mantle, which was probably emplaced in an ocean–continent transition environment during pre-Alpine |
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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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| magma-poor rifted margin: a case study from the Platta ocean-continent transition, eastern Switzerland Received:...magmatism associated with the formation of an ancient ocean-continent transition preserved in the Platta nappe...spatial distribution of the mafic rocks within the ocean-conti- L. Desmurs Department of Earth Sciences...chemical evolution of the mafic rocks along the ocean-continent transitions suggests continuous thinning...ophiolites derived from the Mesozoic Liguria-Piedmont ocean consist predominantly of a serpentinized peridotite |
 | Schwarzenbach, Esther M., Früh-Green, Gretchen L., Bernasconi, Stefano M., Alt, Jeffrey C., Shanks III, Wayne C., Gaggero, Laura, Crispini, Laura (2012) Sulfur geochemistry of peridotite-hosted hydrothermal systems: Comparing the Ligurian ophiolites with oceanic serpentinites. Geochimica et Cosmochimica Acta, 91. 283-305 doi:10.1016/j.gca.2012.05.021 | Journal (article/letter/editorial) |
| Apennines (Italy). We then compare our results with calcite-veined serpentinites from the Iberian Margin formed...formed during the opening of the North Atlantic, and with serpentinites sampled at the active peridotite-hosted...hydrothermal field on the Atlantis Massif near the Mid-Atlantic Ridge. The sulfide and oxide mineral assemblage...serpentinization and tectonic activity along a mid-ocean ridge. Additionally, local enrichment in 34S in...serpentinization of ultramafic rocks exposed to seawater on the ocean floor. We suggest that the thermal structure of the |
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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 |
