Tethyan vs. Cordilleran ophiolites: a reappraisal of distinctive tectono-magmatic features of supra-subduction complexes in relation to the subduction mode

Beccaluva, Luigi; Coltorti, Massimo; Giunta, Giuseppe; Siena, Franca

doi:10.1016/j.tecto.2004.07.034

Cited by 104 publications

(61 citation statements)

References 30 publications

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“…However, this interpretation conflicts with the observation that most boninites are found in the fore-arcs of intraoceanic arcs (e.g. Murton 1989;Johnson and Fryer 1990;Bédard 1999;Beccaluva et al 2004).…”

Section: Tectonic Setting and Petrogenesismentioning

confidence: 74%

Petrological studies of neoproterozoic serpentinized ultramafics of the nubian shield: spinel compositions as evidence of the tectonic evolution of egyptian ophiolites

Azer¹

2014

Acta Geologica Polonica

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The mafic-ultramafic rocks of the Gabal El-Degheimi area, Central Eastern Desert of Egypt, are parts of an ophiolitic section. The ophiolitic rocks are dismembered and tectonically enclosed within, or thrust over, island arc assemblages. Serpentinites, altered slices of the upper mantle, represent a distinctive lithology of the dismembered ophiolites. Some portions of the serpentinized rocks contain fresh relicts of primary minerals such as chromian spinel and olivine. The abundance of bastite and mesh textures suggests harzburgite and dunite protoliths, respectively, for these serpentinites. Some fresh cores of chromian spinel are rimmed by ferritchromite and Cr-magnetite. The development of alteration rims around chromian spinel cores indicates their formation during prograde alteration and under oxidizing conditions during lower amphibolite facies metamorphism. Fresh chromian spinels are characterized by high contents of Cr2O3 (48.92-56.74 wt. %), Al2O3 (10.29-20.08wt. %), FeO (16.24-28.46 wt. %) and MgO (4.89-14.02 wt. %), and very low TiO2 contents (<0.16 wt. %). The analyzed fresh chromian spinels have high Cr# (0.62-0.79) characteristic of spinels in mantle peridotite that has undergone some degree of partial melting. The data presented here suggest that the mantle peridotites of the Gabal El-Degheimi area are similar to forearc peridotites of suprasubduction zone environments.

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Section: Tectonic Setting and Petrogenesismentioning

confidence: 74%

Petrological studies of neoproterozoic serpentinized ultramafics of the nubian shield: spinel compositions as evidence of the tectonic evolution of egyptian ophiolites

Azer¹

2014

Acta Geologica Polonica

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“…Ophiolites provide unique information on the evolution of ancient arcs and oceans as well as the nature of collisional orogenesis (Nicolas 1989;Searle and Cox 1999;Dilek and Newcomb 2003;Beccaluva et al 2004). In addition, ophiolites yield information on the structure and petrophysical properties of modern oceanic lithosphere and subduction systems Vissers and Nicolas 1995;Parkinson and Pearce 1998;Godard et al 2000;Boutelier et al 2003), which determine the large-scale dynamics of the mantle-lithosphere system (Davies and Richard 1992;King 2001).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the geodynamic significance of most ophiolites is well established, as the widespread occurrence of metamorphic soles (Nicolas 1989) and the distinct geochemical signature of immature arc (e.g., Pearce et al 1984) point to an origin in an intraoceanic subduction zone (e.g., Jamieson 1986;Hacker 1994) for most ophiolites. The potential information preserved in ophiolites formed at the initial stages of convergence deserves our attention at different scales (e.g., Boudier et al 1985Boudier et al , 1988Aitchison et al 2000;Beccaluva et al 2004;Berly et al 2006), as they represent the ancient counterparts of modern intraoceanic subduction systems, whereas long-term evolution and deformation mechanisms within subducting and overriding plates are matters of debate (e.g., King 2001;Boutelier et al 2003;Heuret and Lallemand 2005;Doglione et al 2007;Heuret et al 2007;Schellart et al 2007;Schellart 2008).…”

Section: Introductionmentioning

confidence: 99%

Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain)

Barreiro

Catalán²,

Prior³

et al. 2010

The Journal of Geology

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“…Supra-subduction zone ophiolites form two broad groups in terms of their structure, tectonics and magmatic features Beccaluva et al 2004). 'Tethyan' complexes (e.g.…”

Section: Comparison With Other Peridotite Suitesmentioning

confidence: 99%

“…However, the tectonic significance of these bodies is debatable (Coleman 1971;Hamilton 1979;Dilek et al 2000;Beccaluva et al 2004). In East Timor, a peridotite body outcrops as a fault block on the north coast, on the margin of continental crust in a modern island arccontinent collision zone.…”

Section: Introductionmentioning

confidence: 99%

Whole-rock geochemistry of the Hili Manu peridotite, East Timor: implications for the origin of Timor ophiolites ∗

Falloon

Berry

Robinson

et al. 2006

Australian Journal of Earth Sciences

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The Hili Manu peridotite occupies a key position at the outer limit of continental crust on the north coast of East Timor. Most models for the tectonic evolution of the Outer Banda Arc interpret peridotite bodies on Timor, such as Hili Manu, as fragments of young oceanic lithosphere from the Banda Arc (upper plate). However, recent workers have used major-element geochemistry to argue that the peridotite bodies on Timor were derived from the Australian subcontinental lithosphere. Our major, trace and isotopic geochemical study of the Hili Manu peridotite body supports a supra-subduction origin from either a forearc or backarc position for the Hili Manu peridotite. In particular, the wide range in Nd and Sr isotopic compositions, overlapping that of arc volcanics from the Sunda -Banda Island arc, and highly fractionated Nb/Ta values indicate a supra-subduction setting. As there is no evidence for subduction beneath the rifted Australian continental margin, it is unlikely that the Hili Manu peridotite is Australian subcontinental lithosphere. This result, along with the clear supra-subduction setting of the Ocuzzi peridotite and associated volcanics in West Timor, gives support to the interpretation that the Miocene collision between the Banda Arc and the Australian continental margin has produced widespread 'Cordilleran'-style ophiolites on Timor.

show abstract

Tethyan vs. Cordilleran ophiolites: a reappraisal of distinctive tectono-magmatic features of supra-subduction complexes in relation to the subduction mode

Cited by 104 publications

References 30 publications

Petrological studies of neoproterozoic serpentinized ultramafics of the nubian shield: spinel compositions as evidence of the tectonic evolution of egyptian ophiolites

Petrological studies of neoproterozoic serpentinized ultramafics of the nubian shield: spinel compositions as evidence of the tectonic evolution of egyptian ophiolites

Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain)

Whole-rock geochemistry of the Hili Manu peridotite, East Timor: implications for the origin of Timor ophiolites ∗

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