Metamorphic aureoles beneath ophiolite suites and alpine peridotites; tectonic implications with west Newfoundland examples

Williams, Harold; Smyth, W. R.

doi:10.2475/ajs.273.7.594

Cited by 227 publications

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“…Decompression melting aided by fluids lowering the solidus leads to extensive melting of the shallow asthenospheric wedge, creating boninites (high-Mg andesites) and leaves refractory harburgitic mantle tectonites (Stern and Bloomer, 1992). Initiation of subduction and formation of metamorphic soles have been linked to the ophiolite emplacement process (Wakabayashi and Dilek, 2003;Hacker, 1991;Jameison, 1986Jameison, , 1980Williams and Smyth, 1973). The metamorphic soles exhibit inverted metamorphic field gradients, from upper amphibolite facies directly beneath mantle tectonites to greenschist facies close to the mélange contact.…”

Section: Discussionmentioning

confidence: 99%

Section: H E L L E N I D E Smentioning

confidence: 99%

“…The Tethyan ophiolites are structurally underlain by thin sheets of high-grade metamorphic sole rocks (Jamieson, 1986;Robertson and Dixon, 1984;Spray, 1984;Williams and Smyth, 1973). Initiation of subduction and formation of metamorphic soles have been linked to the ophiolite emplacement process (Hacker et al, 1996;Jamieson, 1986Jamieson, , 1980McCaig, 1983;Williams and Smyth, 1973). The subophiolitic metamorphic soles along the Tauride belt are structurally beneath the mantle tectonites and did not experience any later tectonic effects such as re-heating because they have yielded constant well-constrained Late Cretaceous 40 Ar/ 39 Ar plateau ages Dilek et al, 1999;Parlak and Delaloye, 1999).…”

Section: H E L L E N I D E Smentioning

confidence: 99%

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The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

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The Tauride ophiolites lie on the northern and southern flanks of an E-W-trending Tauride carbonate platform. They mainly consist of three tectonic units namely in ascending order, ophiolitic mélange, sub-ophiolitic metamorphic sole and oceanic lithospheric remnants. They were generated above intra-oceanic subduction zones and emplaced over the Tauride carbonate platform from different Neotethyan oceanic basins in the Late Cretaceous. Tauride ophiolites from west to east are described and reviewed. All are underlain by well-preserved dynamothermal metamorphic soles of varied structural thicknesses up to 500 m that have a constant structural position between ophiolitic mélange below and harzburgitic mantle tectonites above and display typical inverted metamorphic sequences from amphibolite facies above to greenschist facies below. The metamorphic soles are shown to have evolved during the initiation of subduction and emplacement processes. In the Pozantı-Karsantı area the contact between the metamorphic sole and the overlying serpentinized harzburgites is characterized by a 1.5-2-m-thick zone of sheared serpentinized harzburgitic mantle intercalated with amphibolites and cut by thick mafic dykes (7-8 m) which postdate intraoceanic metamorphism and high-temperature ductile deformation. This contact is interpreted as an intra-oceanic decoupling surface along which volcanics from the upper levels of the down-going plate were metamorphosed to amphibolite facies and accreted to the base of the hanging wall plate. The metamorphic soles and overlying ophiolitic rocks were intruded by numerous isolated post-metamorphic diabase dykes filled by island arc tholeiitic magma. Subduction initiation and roll-back processes best explain the structural and petrological relationships of Late Cretaceous ophiolite genesis, metamorphic sole formation and subsequent dyke emplacement of the Tauride ophiolites. KEY WORDS: ophiolite, metamorphic sole, dyke emplacement, roll-back, subduction initiation. INTRODUCTIONThe Tauride orogenic belts of Turkey are interpreted as representing a continental fragment that rifted from Gondwana (North Africa) during the Triassic, followed by reamalgamation and continental collision during the OligoMiocene (Karaoğlan et al., 2016) or Miocene (Okay et al., 2010). The Taurides are traditionally divided into three contiguous parts; the western, central and eastern Taurides (Özgül, 1976).Ophiolites along the Tauride belt start with the Lycian nappes to the west and end with the Divriği ophiolite to the east (Fig. 1). These ophiolites (the Lycian nappes, Antalya, Beyşehir-Hoyran nappes, Mersin, Alihoca, Pozantı-Karsantı, Pınarbaşı and Divriği) are situated either on the northern or on the southern flank of an approximately E-W trending Tauride carbonate platform axis (Juteau, 1980 (Juteau, 1980). The plutonic sections and the metamorphic soles of the Tauride ophiolites are cut by numerous isolated microgabbro-diabase and minor pyroxenite dykes at different structural levels (Robertson et al

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Section: Discussionmentioning

confidence: 99%

Section: H E L L E N I D E Smentioning

confidence: 99%

Section: H E L L E N I D E Smentioning

confidence: 99%

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The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

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“…Williams & Smyth, 1973;Jamieson, 1980Jamieson, , 1986Searle & Malpas, 1980;Lippard, Shelton & Gass, 1986;Boudier, Ceuleneer & Nicolas, 1988;. Such metamorphic soles are usually defined as thin zones of metamorphic rocks which show mylonitic fabrics, polyphase deformation and an inverted sequence of metamorphic assemblages that decrease in grade from granulite-amphibolite facies immediately in contact with overlying basal peridotites to greenschist facies at lower structural levels (Jamieson, 1980).…”

Section: Introductionmentioning

confidence: 99%

The emplacement of peridotites and associated oceanic rocks from the Lizard Complex, southwest England

2002

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“…Inverted metamorphism is mostly related to major thrusts, where convergence velocities are high. The major occurrences can be ascribed to one of t hree distinct geological contexts: (i) metamorphic soles beneath ophiolites (e.g., Williams and Smyth, 1973;Jamieson, 1986;Hacker, 1991;Abd El-Naby et al, 2000); (ii) oceanic subduction zones (e.g., Toksöz et al, 1971;Platt, 1975); (iii) major thrusts in continental collision (e.g., LeFort, 1975;Kohn, 2008).…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

Major role of shear heating in intracontinental inverted metamorphism: Inference from a thermo-kinematic parametric study

2013

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role of shear heating in intracontinental inverted metamorphism: Inference from a thermo-kinematic parametric study. Tectonophysics, Elsevier, 2013, 608, pp.812-831. 10.1016/j.tecto.2013 1 Major role of shear heating in intracontinental inverted metamorphism:Inference from a thermo-kinematic parametric study. AbstractInverted metamorphism corresponds to the stacking of high-temperature metamorphic units structurally on top of lower-temperature units and is commonly observed along main thrusts in major orogens. Yet, in spite of many existing models, the origin and preservation of the metamorphic inversion in intracontinental collision belts is still debated. In this study, we use a crustal-scale 2D thermo-kinematic model in order to investigate the key parameters controlling the inversion of the geothermal gradient at crustal scale. Our results confirm that the kinematic framework strongly impacts the thermal evolution around the thrust. Erosion velocity and thermal conductivity of rocks are two parameters that control the spatial location of the thermal perturbation and the intensity of inversion, respectively. However, even in extreme kinematic configurations, i.e., convergence velocities > 3cm.yr 3

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Metamorphic aureoles beneath ophiolite suites and alpine peridotites; tectonic implications with west Newfoundland examples

Cited by 227 publications

References 0 publications

The tauride ophiolites of Anatolia (Turkey): A review

The tauride ophiolites of Anatolia (Turkey): A review

The emplacement of peridotites and associated oceanic rocks from the Lizard Complex, southwest England

Major role of shear heating in intracontinental inverted metamorphism: Inference from a thermo-kinematic parametric study

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