Geochemistry and tectonic significance of metamorphic sole rocks beneath the Beyşehir–Hoyran ophiolite (SW-Turkey)

Elitok, Ömer; Drüppel, Kirsten

doi:10.1016/j.lithos.2007.06.022

Cited by 38 publications

(19 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Whole rock analyses of the isolated dykes cutting the peridotites also suggest a subduction related setting because they show marked Nb-depletion when normalized to N-MORB (Andrew and Robertson, 2002). Elitok and Drüppel (2008) reported that the dykes cutting the peridotites and the metamorphic sole in Şarkikaraağaç area exhibit depleted-to enriched-LREE geochemistry, also suggesting a subduction-related setting for their genesis. The amphibolites from the metamorphic sole of the Gencek area of the Beyşehir-Hoyran ophiolites to the south of Beyşehir Lake have alkaline to subalkaline compositions .…”

Section: Petrogenesis and Geochronology Of The Beyşehir-hoyran Ophiolitementioning

confidence: 99%

“…A number of tectonic models have been proposed for the Tauride belt ophiolites to account for the oceanic lithosphere generation, metamorphic sole formation, dyke emplacement and subsequent ophiolite emplacement onto the Tauride Platform (Çelik and Chiaradia, 2008;Elitok and Drüppel, 2008;Çelik, 2007;Parlak et al, 2006;Parlak and Robertson, 2004;Andrew and Robertson, 2002;Dilek et al, 1999;Collins and Robertson, 1997;Dilek and Whitney, 1997;Polat et al, 1996;Lytwyn and Casey, 1995). All authors agree that metamorphic soles were derived from ocean island basalts (OIB), mid-ocean ridge basalts (MORB), island arc tholeiite (IAT) basalts and associated sediments at the beginning of intra-oceanic subduction of the downgoing plate and indicate the presence of SSZ-type crust on the overriding plate.…”

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

confidence: 99%

“…10). The harzburgites exhibit mediumgrained granoblastic texture and are characterized by forsteritic olivine (Mg# 92-93 ), orthopyroxene and minor chromian spinel and diplay mylonitic textures at the basal thrust contact (Elitok and Drüppel, 2008). Isolated diabase dykes intrude the mantle tectonites.…”

Section: Beyşehir-hoyran Ophiolitementioning

confidence: 99%

“…Isolated diabase dykes intrude the mantle tectonites. A thin sheet of highlydeformed metamorphic sole rocks, up to 140 m thick, tectonically underlies the harzburgitic mantle tectonites (Elitok and Drüppel, 2008). These rocks directly beneath the mantle tectonites mainly exhibit granoblastic to nematoblastic textures and are composed of pyroxene amphibolite and amphibolite, followed by epidote amphibolite, plagioclase amphibolite, calcschist and quartzite towards the bottom (Elitok and Drüppel, 2008).…”

Section: Beyşehir-hoyran Ophiolitementioning

confidence: 99%

“…The harzburgites are intruded by isolated diabase dykes at different structural levels (Elitok and Drüppel, 2008). In both regions, the ophiolites are tectonically underlain by ophiolitic mélanges that contain blocks of recrystallized limestone, gabbro, isolated diabase, radiolarite, cherts, and silicaclastic rocks set in a strongly sheared serpentinite matrix (Elitok and Drüppel, 2008). The ophiolite-related units in both areas are overthrust by Upper Triassic massive neritic limestones and wildflysch deposits.…”

Section: Beyşehir-hoyran Ophiolitementioning

confidence: 99%

See 4 more Smart Citations

The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

View full text Add to dashboard Cite

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

show abstract

Section: Petrogenesis and Geochronology Of The Beyşehir-hoyran Ophiolitementioning

confidence: 99%

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

confidence: 99%

Section: Beyşehir-hoyran Ophiolitementioning

confidence: 99%

Section: Beyşehir-hoyran Ophiolitementioning

confidence: 99%

Section: Beyşehir-hoyran Ophiolitementioning

confidence: 99%

See 3 more Smart Citations

The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

View full text Add to dashboard Cite

show abstract

Dynamics of intraoceanic subduction initiation: 2. Suprasubduction zone ophiolite formation and metamorphic sole exhumation in context of absolute plate motions

Hinsbergen

Peters

Maffione

et al. 2015

Geochem Geophys Geosyst

116

View full text Add to dashboard Cite

Analyzing subduction initiation is key for understanding the coupling between plate tectonics and the underlying mantle. Here we focus on suprasubduction zone (SSZ) ophiolites and how their formation links to intraoceanic subduction initiation in an absolute plate motion frame. SSZ ophiolites form the majority of exposed oceanic lithosphere fragments and are widely recognized to have formed during intraoceanic subduction initiation. Structural, petrological, geochemical, and plate kinematic constraints on their kinematic evolution show that SSZ crust forms at fore-arc spreading centers at the expense of a mantle wedge, thereby flattening the nascent slab. This leads to the typical inverted pressure gradients found in metamorphic soles that form at the subduction plate contact below and during SSZ crust crystallization. Former spreading centers are preserved in forearcs when subduction initiates along transform faults or offridge oceanic detachments. We show how these are reactivated when subduction initiates in the absolute plate motion direction of the inverting weakness zone. Upon inception of slab pull due to, e.g., eclogitization, the sole is separated from the slab, remains welded to the thinned overriding plate lithosphere, and can become intruded by mafic dikes upon asthenospheric influx into the mantle wedge. We propound that most ophiolites thus formed under special geodynamic circumstances and may not be representative of normal oceanic crust. Our study highlights how far-field geodynamic processes and absolute plate motions may force intraoceanic subduction initiation as key toward advancing our understanding of the entire plate tectonic cycle.

show abstract

Petrological and geochemical characterization of metamorphic sole rocks beneath the RasKoh ophiolite, western Pakistan: Implication for a Late Cretaceous supra‐subduction zone‐type forearc

et al. 2021

View full text Add to dashboard Cite

Small, isolated outcrops of metamorphic sole rocks to the RasKoh ophiolite are exposed south‐east of the RasKoh Arc range, western Pakistan. These crop out as thin slices beneath the sheared serpentinites, and consist of amphibolites, epidote‐bearing amphibolites, and muscovite‐rich amphibolites with granoblastic, grano‐nematoblastic, and porphyroblastic textures. Geochemically, amphibolites present two compositional groups. Group‐I amphibolites are alkaline and enriched in light rare‐earth elements (LREE; LaN/YbN = 11.47–11.60) with Sr‐Nd isotopic compositions of (87Sr/86Sr)i = 0.705481–0.706128, (143Nd/144Nd)i = 0.512668–0.512672, and lower values of εNd(t) (+2.24 to +2.32). While, Group‐II amphibolites are tholeiitic with LREE‐depleted signatures (LaN/YbN = 0.88–1.31), (87Sr/86Sr)i = 0.706103–0.706303, (143Nd/144Nd)i = 0.512851–0.512936, and higher values of εNd(t) (+5.81 to +7.47). Primitive mantle‐normalized and other geochemical diagrams indicate that the protoliths for Group‐I amphibolites are oceanic island basalts (OIB). Conversely, Group‐II amphibolites are more akin to subduction‐related arc tholeiites with geochemical signatures, slightly enriched in large‐ion lithophile elements and with negative Nb‐Ta anomalies. The geothermobarometric results estimate that these rocks were metamorphosed at amphibolite facies at 690°C and 6.5 kbar. Alkaline volcanism is well documented from the other Mesozoic ophiolites of Neo‐Tethyan suture zones. We suggest that the OIB accreted to the base of the obducted plate at an early stage, whereas the island arc tholeiites (IAT) basalts metamorphosed and accreted to the base of the RasKoh ophiolite at a later stage. The OIB‐ and IAT‐type magmas as protolith of amphibolites suggest that the RasKoh ophiolite was emplaced in a supra‐subduction zone‐type forearc in Late Cretaceous (ca. 68–64 Ma).

show abstract

Geochemistry and tectonic significance of metamorphic sole rocks beneath the Beyşehir–Hoyran ophiolite (SW-Turkey)

Cited by 38 publications

References 38 publications

The tauride ophiolites of Anatolia (Turkey): A review

The tauride ophiolites of Anatolia (Turkey): A review

Dynamics of intraoceanic subduction initiation: 2. Suprasubduction zone ophiolite formation and metamorphic sole exhumation in context of absolute plate motions

Petrological and geochemical characterization of metamorphic sole rocks beneath the RasKoh ophiolite, western Pakistan: Implication for a Late Cretaceous supra‐subduction zone‐type forearc

Contact Info

Product

Resources

About