K-Ar dating of some infra-ophiolitic metamorphic soles from the Eastern Mediterranean: New evidence for oceanic thrustings before obduction

Thuizat, R.; Whitechurch, Hubert; Montigny, R.; Juteau, Thierry

doi:10.1016/0012-821x(81)90185-0

Cited by 110 publications

(60 citation statements)

References 23 publications

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“…Pressure-temperature conditions (P/T) under which the metamorphic sole rocks in the Köyceğiz and Yeşilova regions formed were ~550 o C/~5 kbar and ~600 o C/~5 kbar, respectively (Çelik, 2002). Thuizat et al (1981) reported varied K-Ar ages for different mineral separates from three samples from the metamorphic sole at the base of the Lycian ophiolites. These are 102±4 to 98±4 Ma for hornblende separates, 88±4 to 83±3 Ma for plagioclase separates and 93±3 Ma for muscovite separates (Thuizat et al, 1981).…”

Section: Petrogenesis and Geochronology Of The Lycian Ophiolitesmentioning

confidence: 99%

“…Thuizat et al (1981) reported varied K-Ar ages for different mineral separates from three samples from the metamorphic sole at the base of the Lycian ophiolites. These are 102±4 to 98±4 Ma for hornblende separates, 88±4 to 83±3 Ma for plagioclase separates and 93±3 Ma for muscovite separates (Thuizat et al, 1981). Çelik and Chiaradia (2008) Cretaceous (Çelik et al, 2006).…”

Section: Petrogenesis and Geochronology Of The Lycian Ophiolitesmentioning

confidence: 99%

“…The magmatic rocks (gabbro, diabase, plagiogranite) and the metamorphic rocks from the Alakırçay mélange as well as the Tekirova ophiolite yielded very scattered (130 to 60 Ma) K-Ar cooling ages (Yılmaz, 1984). Thuizat et al (1981) (Çelik et al, 2006).…”

Section: Petrogenesis and Geochronology Of The Tekirova (Antalya) Ophmentioning

confidence: 99%

“…The first geochronological study on the amphibolites of the metamorphic sole rocks from the Beyşehir-Hoyran ophiolite by K-Ar yielded cooling ages of 93±3 Ma for hornblende and 84±3 Ma for plagioclase separates (Thuizat et al, 1981). More precise 40 Ar/ 39 Ar cooling ages of 91.5±1.9 to 90.9±1.3 Ma were obtained by Çelik et al (2006).…”

Section: Petrogenesis and Geochronology Of The Beyşehir-hoyran Ophiolitementioning

confidence: 99%

“…Thuizat et al (1981) (Dilek et al, 1999;Parlak and Delaloye, 1999). Pressure-temperature conditions (P/T) under which the metamorphic sole rocks formed were 522±15 o C and ~5 kbar (Çelik, 2008).…”

Section: Petrogenesis and Geochronology Of The Mersin Ophiolitementioning

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: Petrogenesis and Geochronology Of The Lycian Ophiolitesmentioning

confidence: 99%

Section: Petrogenesis and Geochronology Of The Lycian Ophiolitesmentioning

confidence: 99%

Section: Petrogenesis and Geochronology Of The Tekirova (Antalya) Ophmentioning

confidence: 99%

Section: Petrogenesis and Geochronology Of The Beyşehir-hoyran Ophiolitementioning

confidence: 99%

Section: Petrogenesis and Geochronology Of The Mersin Ophiolitementioning

confidence: 99%

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The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

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Mineralogy, geochemistry and geotectonic significance of harzburgites from the southern Dramala upper mantle suite, Pindos ophiolite complex, NW Greece

Kapsiotis

2014

Geological Journal

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The Dramala massif, located in the Dinarides–Hellenides orogenic belt, forms the mantle section of the Neotethyan Pindos ophiolite complex in NW continental Greece. Its southern domain is comprised mainly of voluminous harzburgite masses with variable clinopyroxene and olivine modal abundances, ranging from clinopyroxene‐bearing to typical and olivine‐rich harzburgites. The harzburgite varieties are characterized by elevated Cr# [Cr/(Cr + Al)] in Cr‐spinel (0.43–0.79), high forsterite (Fo) content in olivine (0.90–0.93), low Al2O3 content in clinopyroxene (≤1.77 wt.%) and poor whole‐rock abundances of Al2O3 (≤0.68 wt.%), CaO (≤0.68 wt.%), Sc (≤11 ppm) and REE, which are indicative of their refractory nature. In terms of fO2 values, the southern Pindos harzburgites plot between the FMQ‐2 (Fayalite–Magnetite–Quartz) and FMQ + 2 buffers. Simple batch and fractional melting models are not sufficient to explain their depleted composition. Their Ni/Yb ratios vs. Yb bulk‐rock abundances can be reproduced by up to 22–31% closed‐system non‐modal dynamic melting of an assumed spinel‐bearing lherzolite source. Cr‐spinel chemistry data suggest that the southern Dramala harzburgites were formed in an oceanic centre and then were reworked in the mantle wedge above a subducted slab. Combined petrographic and compositional data indicate that the studied harzburgites interacted with arc‐derived tholeiitic melts. This interaction resulted in substantial olivine and minor Cr‐spinel addition to the studied harzburgites, thus enhancing their refractoriness. Cryptic metasomatism was plausibly responsible for the demolition of any strong geochemical signatures suggestive of a previous melting event in a spreading centre. Comparable observations from the neighbouring Vourinos suite imply that the southern Dramala harzburgites probably represent an arc/fore‐arc mantle region within the mutual Pindos–Vourinos, Mesohellenic lithospheric mantle. Copyright © 2014 John Wiley & Sons, Ltd.

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New insights on the tectonic setting and evolution around the apex of the Isparta Angle (SW Turkey)

et al. 2003

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Recently acquired data lead to a revision of the structure around the apex of the Isparta Angle (area around Isparta). In the autochthonous/parautochthonous carbonate platform several blocks are identified as having followed distinctive palaeogeographical evolutions during Mesozoic times. These blocks are: the Kır Dağları, the Barla Dağ, the Söbü Dağ and the Bey Dağları. However, the latter two blocks cannot be considered as identical as previously believed. A major thrust fault may separate these blocks, which may be substantially allochthonous with respect to the relatively autochthonous Bey Dağları. Within the allochthon, in the Isparta Çay area, studied here, Mesozoic deep‐marine sequences are thrust duplicated many times. The tectonic history of the area is polyphased, the main events being in the Late Cretaceous (initiation of shortening), pre‐Miocene (Antalya Nappe emplacement), and Late Miocene/Pliocene (Aksu thrusting). The Aksu phase reactivates older thrusts and has given rise to the most prominent relief of the area (the Davras Dağ, 2600 m). Palaeogeographic reconstructions are proposed to take account of all the above data. Copyright © 2003 John Wiley & Sons, Ltd.

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K-Ar dating of some infra-ophiolitic metamorphic soles from the Eastern Mediterranean: New evidence for oceanic thrustings before obduction

Cited by 110 publications

References 23 publications

The tauride ophiolites of Anatolia (Turkey): A review

The tauride ophiolites of Anatolia (Turkey): A review

Mineralogy, geochemistry and geotectonic significance of harzburgites from the southern Dramala upper mantle suite, Pindos ophiolite complex, NW Greece

New insights on the tectonic setting and evolution around the apex of the Isparta Angle (SW Turkey)

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