Fossil mantle-sediments interface recognized in the Western Alps metaophiolites: a key to unravel the accretion mechanism of the Jurassic Tethys ocean

Tartarotti, Paola; Festa, Andrea; Benciolini, Luca; Balestro, Gianni

doi:10.3301/rol.2015.179

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Lagabrielle et al, 2015 and refs. therein;Tartarotti, Festa, Benciolini, & Balestro, 2015;Tricart & Lemoine, 1991) for not showing the direct juxtaposition of oceanic sediments upon serpentinised peridotites and associated gabbroic intrusions. Comparisons with modern slow-spreading oceans have lead many authors to interpret the primary association of serpentinites and sediments as a signature of tectonic mantle denudation in the Jurassic Tethys (e.g.…”

Section: Discussionmentioning

confidence: 99%

Geology of the Saint-Marcel valley metaophiolites (Northwestern Alps, Italy)

Tartarotti

Martin

Monopoli³

et al. 2017

Journal of Maps

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The geological map of the Saint-Marcel valley at the scale of 1:20,000 illustrates the tectonic setting of metaophiolites from the southern Aosta Valley, in the Italian side of the Western Alpine belt. The map highlights the sharp contact between the metaophiolitic basement and its metasedimentary cover, which mainly consists of quartzites, marbles, and calcschists. In spite of the Alpine tectonics, this contact is regarded as deriving from the original oceanic crust/sediments interface. Metaophiolites mostly consist of metabasalts hosting Fe-Cu sulphide mineralisations, characterised by high-pressure metamorphic imprint. These rocks likely represent the shallowest portion of the Tethyan oceanic lithosphere created near the axis of the slow-spreading ridge where hydrothermal fluid circulation was active. Selected key-sections through metasediments reveal a consistent internal lithostratigraphy, in spite of the pervasive metamorphic and tectonic reworking acting during the Alpine evolution. Metasediments reflect various sedimentation episodes starting from pelagic and proximal settings to the onset of the orogenic stage. The Saint-Marcel valley metasediments thus reflect a changing in the sedimentation environments through time and space during the overall geologic evolution. ARTICLE HISTORY

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Section: Discussionmentioning

confidence: 99%

Geology of the Saint-Marcel valley metaophiolites (Northwestern Alps, Italy)

Tartarotti

Martin

Monopoli³

et al. 2017

Journal of Maps

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Origin and significance of olistostromes in the evolution of orogenic belts: A global synthesis

et al. 2016

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Olistostromes (sedimentary mélanges) represent the products of ancient submarine mass transport processes. We present a comparative analysis of the occurrences and internal structures of these sedimentary mélanges at a global scale with a focus on the Circum-Mediterranean, Appalachian and Circum-Pacific regions, and discuss their formation and time-progressive evolution in different tectonic settings. Lithological compositions, stratigraphy, and structural features of olistostromes reflect the operation of an entire spectrum of mass transport processes during their development through multi-stage deformation phases. The general physiography and tectonic setting of their depocenters, the nature, scale and rate of downslope transformation mechanisms, and global climatic events are the main factors controlling the internal structure and stratigraphy of olistostromes. Based on the tectonic settings of their formation olistostromes are classified as: (i) passive margin, (ii) convergent margin and subduction–accretion, and (iii) collisional and intra-collisional types. Systematic repetitions of these different olistostrome types in different orogenic belts provide excellent markers for the timing of various tectonic events during the Wilson cycle evolution of ocean basins. Olistostromes are best preserved in paleo active margins, covering vast areas of thousands of km2, where they underwent significant downslope translation, up to hundreds of kilometers. Incorporation of olistostromes into subduction–accretion complexes and orogenic belts takes place during discrete episodes of tectonic events, and their primary (sedimentary) fabric may be commonly reworked and overprinted by subsequent phases of tectonic and metamorphic events. We apply the basic nomenclature of structural geology, sedimentology and basin analysis in studying the internal structure, lithological makeup, and mechanisms of formation and extraordinary downslope mobility of olistostromes

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Fossil mantle-sediments interface recognized in the Western Alps metaophiolites: a key to unravel the accretion mechanism of the Jurassic Tethys ocean

Cited by 2 publications

References 11 publications

Geology of the Saint-Marcel valley metaophiolites (Northwestern Alps, Italy)

Geology of the Saint-Marcel valley metaophiolites (Northwestern Alps, Italy)

Origin and significance of olistostromes in the evolution of orogenic belts: A global synthesis

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