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Role of Late Jurassic intra-oceanic structural inheritance in the Alpine tectonic evolution of the Monviso meta-ophiolite Complex (Western Alps)

  • GIANNI BALESTRO (a1), ANDREA FESTA (a1), ALESSANDRO BORGHI (a1), DANIELE CASTELLI (a1), MARCO GATTIGLIO (a1) and PAOLA TARTAROTTI (a2)...
Abstract
Abstract

The eclogite-facies Monviso meta-ophiolite Complex in the Western Alps represents a well-preserved fragment of oceanic lithosphere and related Upper Jurassic – Lower Cretaceous sedimentary covers. This meta-ophiolite sequence records the evolution of an oceanic core complex formed by mantle exhumation along an intra-oceanic detachment fault (the Baracun Shear Zone), related to the opening of the Ligurian–Piedmont oceanic basin (Alpine Tethys). On the basis of detailed geological mapping, and structural, stratigraphic and petrological observations, we propose a new interpretation for the tectonostratigraphic architecture of the Monviso meta-ophiolite Complex, and discuss the role played by structural inheritance in its formation. We document that subduction- and exhumation-related Alpine tectonics were strongly influenced by the inherited Jurassic intra-oceanic tectonosedimentary physiography. The latter, although strongly deformed during a major Alpine stage of non-cylindrical W-verging folding and faulting along exhumation-related Alpine shear zones (i.e. the Granero–Casteldelfino and Villanova–Armoine shear zones), was not completely dismembered into different tectonic units or subduction-related mélanges as suggested in previous interpretations. The present-day architecture of the Monviso meta-ophiolite Complex results from nappe-scale folding with a significant component of shearing, and strain partitioning of the Alpine deformation, which were controlled by the inherited occurrence of (i) lateral and vertical variations of facies and thickness of sediments, (ii) an intra-oceanic fault-rock assemblage, which acted as weak horizons in concentrating deformation, and (iii) remnants of a volcanic ridge, which consists of massive metabasalt. Thus, the recognition of pre-collisional, intra-oceanic, tectonostratigraphic inheritance represents an important step in reconstructing the tectonic evolution of meta-ophiolite units in orogenic belts.

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Author for correspondence: andrea.festa@unito.it
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Submitted to: GEOLOGICAL MAGAZINE–Special Issue on “Birth and Death of Oceanic Basins”

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

S. Angiboust , P. Agard , H. Raimbourgh , P. Yamato & B. Huet 2011. Subduction interface processes recorded by eclogite-facies shear zones (Monviso, W. Alps). Lithos 127, 222–38.

S. Angiboust , R. Langdon , P. Agard , D. Waters & C. Chopin 2012. Eclogitization of the Monviso ophiolite (W. Alps) and implications on subduction dynamics. Journal of Metamorphic Geology 30, 3761.

G. Balestro , A. Festa , Y. Dilek & P. Tartarotti 2015. Pre-Alpine extensional tectonics of a peridotite-localized oceanic core complex in the late Jurassic, high-pressure Monviso ophiolite (Western Alps). Episodes 38 (4), 266–82.

G. Balestro , A. Festa & P. Tartarotti 2015. Tectonic significance of different block-in-matrix structures in exhumed convergent plate margins: examples from oceanic and continental HP rocks in Inner Western Alps (northwest Italy). International Geology Review 57 (5–8), 581605.

G. Balestro , B. Lombardo , G. Vaggelli , A. Borghi , A. Festa & M. Gattiglio 2014. Tectonostratigraphy of the northern Monviso meta-ophiolite complex (Western Alps). Italian Journal of Geosciences 133 (3), 409–26.

M. C. Blake , D. E. Moore & A. S. Jayko 1995. The role of serpentinite melanges in the unroofing of ultrahigh-pressure metamorphic rocks: an example from the Western Alps in Italy. In Ultrahigh Pressure Metamorphism (eds R. G. Coleman & X. Wang ), pp. 182205. Cambridge: Cambridge University Press.

C. Boschi , E. Bonatti , M. Ligi , D. Brunelli , A. Cipriani , L. Dallai , M. D'Orazio , G. L. Früh-Green , S. Tonarini , J. D. Barnes & R. M. Bedini 2013. Serpentinization of mantle peridotites along an uplifted lithospheric section, Mid Atlantic Ridge at 11° N. Lithos 178, 323.

C. Boschi , G. L. Früh-Green & A. Delacour 2006. Mass transfer and fluid flow during detachment faulting and development of an oceanic core complex, Atlantis Massif (MAR 30° N). Geochemistry, Geophysics, Geosystems 7, Q01104, doi: 10.1029/2005GC001074.

M. Cannat 1993. Emplacement of mantle rocks in the seafloor at Mid-Ocean ridge. Journal of Geophysical Research 98 (B3), 4163–72.

J. Dewey & H. Spall 1975. Pre-Mesozoic plate tectonics: how far back in Earth history can the Wilson Cycle be extended? Geology 3, 422–4.

H. J. B. Dick , M. A. Tivey & B. E. Tucholke 2008. Plutonic foundation of a slow-spreading ridge segment: oceanic core complex at Kane Megamullion, 23_300N, 45_200W. Geochemistry, Geophysics, Geosystems 9, Q05014, doi: 10.1029/2007GC001645.

J. A. Dunbar & D. S. Sawyer 1989. How preexisting weaknesses control the style of continental breakup. Journal of Geophysical Research 94 (B6), 7278–92.

J. Escartin , D. K. Smith , J. Cann , H. Schouten , C. H. Langmuir & S. Escrig 2008. Central role of detachment faults in accretion of slowspread oceanic lithosphere. Nature 455, 790–4.

A. Festa , Y. Dilek , G. Codegone , S. Cavagna & G. A. Pini 2013. Structural anatomy of the Ligurian accretionary wedge (Monferrato, NW-Italy), and evolution of superposed mélanges. Geological Society of America Bulletin 125, 1580–98.

C. Groppo & D. Castelli 2010. Prograde P–T evolution of a lawsonite eclogite from the Monviso Meta-ophiolite (Western Alps): dehydration and redox reactions during subduction of oceanic FeTi-oxide gabbro. Journal of Petrology 51, 2489–514.

S. Guillot , S. Schwartz , K. Hattori , A. Auzende & J. Lardeaux 2004. The Monviso ophiolitic Massif (Western Alps), a section through a serpentinite subduction channel. In Evolution of the Western Alps: Insights from Metamorphism, Structural Geology, Tectonics and Geochronology (eds M. Beltrando, G. Lister, J. Ganne & A. Boullier). Journal of the Virtual Explorer 16.

C. E. Hall , M. Gurnis , M. Sdrolias , L. L. Lavier & R. D. Muller 2003. Catastrophic initiation of subduction following forced convergence across fracture zones. Earth and Planetary Science Letters 212, 1530.

J. A. Karson , G. L. Früh-Green , D. S. Kelley , E. A. Williams , D. R. Yoerger & M. Jakuba 2006. Detachment shear zone of the Atlantis Massif core complex, Mid-Atlantic Ridge, 30° N: Geochemistry, Geophysics, Geosystems 7 (6), Q06016, doi: 10.1029/20O5GC001109.

M. Lemoine , T. Bas , A. Arnaud-Vanneau , H. Arnaud , T. Dumont , M. Gidon , P. C. de Graciansky , J. L. Rudkiewicz , J. Mégard-Galli & P. Tricart 1986. The continental margin of the Mesozoic Tethys in the Western Alps. Marine and Petroleum Geology 3, 179–99.

W. Leng & M. Gurnis 2011. Dynamics of subduction initiation with different evolutionary pathways. Geochemistry, Geophysics, Geosystems 12, Q12018, doi: 10.1029/2011GC003877.

Z. H. Li , T. V. Gerya & J.-P. Burg 2010. Influence of tectonic overpressure on P-T paths of HP-UHP rocks in continental collision zones: thermomechanical modelling. Journal of Metamorphic Geology 28, 227–47.

M. Maffione , C. Thieulot , D. J. J. van Hinsbergen , A. Morris , O. Plumper & W. Spakman 2015. Dynamics of intraoceanic subduction initiation: 1. Oceanic detachment fault inversion and the formation of supra-subduction zone ophiolites. Geochemistry, Geophysics, Geosystems 16, doi: 10.1002/2015GC005746.

M. Marroni , F. Meneghini & L. Pandolfi 2010. Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy. International Geology Review 52, 1160–92.

B. Messiga , J. R. Kienast , G. Rebay , M. P. Riccardi & R. Tribuzio 1999. Cr-rich magnesiochloritoid eclogites from the Monviso ophiolites (Western Alps, Italy). Journal of Metamorphic Geology 17, 287–99.

E. A. Miranda & Y. Dilek 2010. Oceanic core complex development in modern and ancient oceanic lithosphere: gabbro-localized versus peridotite-localized detachment models. Journal of Geology 118, 95109.

D. E. Moore & D. A. Lockner 2007. Comparative deformation behavior of minerals in serpentinized ultramafic rock: application to the slab-mantle interface in subduction zones. International Geology Review 49, 401–15.

S. Nadeau , P. Philippot & F. Pineau 1993. Fluid inclusion and mineral isotopic compositions (HCO) in eclogitic rocks as tracers of local fluid migration during high-pressure metamorphism. Earth and Planetary Science Letters 114 (4), 431–48.

K. D. Petersen & C. Schiffer 2016. Wilson cycle passive margins: control of orogenic inheritance on continental breakup. Gondwana Research 39, 131–44.

P. Philippot 1990. Opposite vergence of nappes and crustal extension in the French-Italian Western Alps. Tectonics 9 (5), 1143–64.

P. Philippot & J. R. Kienast 1989. Chemical-microstructural changes in eclogite-facies shear zones (Monviso, Western Alps, north Italy) as indicators of strain history and the mechanism and scale of mass transfer. Lithos 23 (3), 179200.

T. J. Reston & C. R. Ranero 2011. The 3-D geometry of detachment faulting at mid-ocean ridges. Geochemistry, Geophysics, Geosystems 12, Q0AG05, doi: 10.1029/2011GC003666.

G. Reuber , B. J. P. Kaus , S. M. Schmalholz & R. W. White 2016. Nonlithostatic pressure during subduction and collision and the formation of (ultra)high-pressure rocks. Geology, published online April 2016. doi: 10.1130/G37595.1.

G. Rosenbaum & G. S. Lister 2005. The Western Alps from the Jurassic to Oligocene: spatio-temporal constraints and evolutionary reconstructions. Earth-Science Reviews 69, 281306.

D. Rubatto & S. Angiboust 2015. Oxygen isotope record of fluid metasomatism during subduction: a P-T-time-fluid path for the Monviso eclogites (Italy). Contributions to Mineralogy and Petrology 170 (5), 44, doi: 10.1007/s00410-015-1198-4.

D. Rubatto & J. Hermann 2003. Zircon formation during fluid circulation in eclogites (Monviso, Western Alps): implications for Zr and Hf budget in subduction zones. Geochimica et Cosmochimica Acta 67 (12), 2173–87.

T. Schroeder , B. John & B. R. Frost 2002. Geologic implications of seawater circulation through peridotite exposed at slow-spreading mid-ocean ridges. Geology 30 (4), 367–70.

S. Schwartz , J. Lardeaux , S. Guillot & P. Tricart 2000. Diversité du métamorphisme éclogitique dans le massif ophiolitique du Monviso (Alpes occidentales, Italie). Geodinamica Acta 13, 169–88.

C. Spandler , T. Pettke & D. Rubatto 2011. Internal and external fluid sources for eclogite-facies veins in the Monviso Meta-ophiolite, Western Alps: implications for fluid flow in Subduction Zones. Journal of Petrology 52 (6), 1207–36.

P. Tartarotti , A. Festa , L. Benciolini & G. Balestro 2017. Record of Jurassic mass transport processes through the orogenic cycle: understanding chaotic rock units in the high-pressure Zermatt-Saas ophiolite (Western Alps). Lithosphere 9 (3), 399407.

K. Theunissen , J. Klerkx , A. Melnikov & A. Mruma 1996. Mechanisms of inheritance of rift faulting in the western branch of the East African Rift, Tanzania. Tectonics 15, 776–90.

J. Toth & M. Gurnis 1998. Dynamics of subduction initiation at preexisting fault zones. Journal of Geophysical Research 103, 18053–67.

A. Tommasi & A. Vauchez 2001. Continental rifting parallel to ancient collisional belts: an effect of the mechanical anisotropy of the lithospheric mantle. Earth and Planetary Science Letters 185, 199210.

P. Tricart & M. Lemoine 1991. The Queyras ophiolite west of Monte Viso (Western Alps): indicator of a peculiar ocean floor in the Mesozoic Tethys. Journal of Geodynamics 13, 163–81.

P. Tricart & S. Schwartz 2006. A north-south section across the Queyras Schistes lustrés (Piedmont zone, western Alps): syn-collision refolding of a subduction wedge. Eclogae Geologicae Helvetiae 99, 429–42.

B. Tucholke , J. Lin & M. C. Kleinrock 1998. Megamullions and mullion structure defining oceanic metamorphic core complexes on the Mid-Atlantic Ridge. Journal of Geophysical Research 103, 9857–66.

R. L. M. Vissers , D. J. J. Van Hinsbergen , P. TH. Meijer & G. B. Piccardo 2013. Kinematics of Jurassic ultra-slow spreading in the Piemonte Ligurian ocean. Earth and Planetary Science Letters 380, 138–50.

J. T. Wilson 1966. Did the Atlantic close and then re-open? Nature 211, 676–81.

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