Mantle source characteristics of Triassic alkaline lavas within the Antalya Nappes, SW Turkey

Aldanmaz, Ercan; Güçtekin, Aykut; Yıldız-Yüksekol, Özlem

doi:10.5194/egusphere-egu2020-6775

Cited by 1 publication

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“…It is generally accepted that the widespread presence of Tethyan OIBs has been attributed to a plume-type mantle origin (Dixon and Robertson, 1999;Lapierre et al, 2007;Varol et al, 2007;Maury et al, 2008;Sayıt and Göncüoğlu, 2009;Sayıt, 2013). In contrast, E-MORBs were attributed to the plume-ridge interaction (involving the mixing of the plume-type mantle and depleted MORB source mantle) and the melting of a heterogeneous mantle source (e.g., Aldanmaz et al, 2008;Sayıt and Göncüoğlu, 2009). As seen in the literature, though it is expected that regional-scale uplift remains a significant characteristic for major plumeinfluenced regions like the Gulf of Aden and East Africa, there is still no evidence to agree with this relationship.…”

Section: Discussionmentioning

confidence: 95%

“…Many workers agree that ocean island basalts (OIBs) are commonly derived from low degrees of partial melting of a spinel/garnet peridotite mantle source, while E-MORB is formed from a compositionally similar upper mantle with higher degrees of partial melting (Hofmann and White, 1982;Zindler and Hart, 1986;Hofmann, 1997;Fitton, 2007). OIB and E-MORB commonly occur together in the modern environment, like in Iceland, and can be also found in the Tethyan suture zones (Lapierre et al, 2004(Lapierre et al, , 2007Saccani and Photiades, 2005;Varol et al, 2007Varol et al, , 2011Aldanmaz et al, 2008;Bagheri and Stampfli, 2008;Maury et al, 2008;Xia et al, 2008;Sayıt et al, 2010;Dai et al, 2011;Elitok, 2012;Robertson et al, 2016). Late Triassic volcanic rocks of the Eastern Mediterranean region show that there is a close association between E-MORB and OIB, but not N-MORB.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, apart from the direct involvement of mantle plumes, such materials can be present in the asthenospheric upper mantle as recycled pods/streaks. Thus, as an alternative solution, the idea of a heterogeneous mantle is also suggested (e.g., Aldanmaz et al, 2008;Marroni et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

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Petrology of the late Triassic mafic volcanic rocks from the Antalya Complex, southern Turkey: evidence for mantle source characteristics during the Neotethyan rifting

Bağci¹,

Rızaoğlu²,

Önal³

et al. 2020

Turkish J Earth Sci

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The Antalya Complex in southern Turkey comprises a number of autochthonous and allochthonous units that originated from the Southern Neotethys. Late Triassic volcanic rocks are widespread in the Antalya Complex and are important for the onset of the rifting stage of the southern Neotethys. The studied Late Triassic volcanic rocks within the Antalya Complex are exposed in the southern part of Saklıkent (Antalya) region. They are represented by pillow, massive, and columnar-jointed lava flows with volcaniclastic breccias and pelagic limestone intercalations. Spilitic basalts exhibit intersertal, microlithic porphyritic, and ophitic textures and are represented by plagioclase, pyroxene, and olivine. Secondary phases are characterized by serpentine, calcite, chlorite, epidote, zeolite, and quartz. Based on Zr/Ti vs. Nb/Y ratios, the volcanic rocks are represented by alkaline basalts (Nb/Y = 1.54–2.82). A chondrite normalized REE diagram for the volcanic rocks displays significant LREE enrichment with respect to HREE ([La/Yb]N = 15.14–19.77). Trace element geochemistry of the studied rocks suggests that these rocks are more akin to ocean island basalt (OIB) and were formed by small degrees (~2–4%) of partial melting of an enriched mantle source (spinel + garnet-bearing lherzolite). The volcanic rocks of the Saklıkent region exhibit similarities to the Late Triassic volcanics of the Koçali Complex in SE Anatolia and the Mamonia Complex (Cyprus) in terms of their geochemical features. All evidence suggests that the Late Triassic alkaline volcanics in Antalya, Mamonia (Cyprus), and the Koçali (Adıyaman) Complexes were formed in an extensional environment at the continent-ocean transition zone during the rifting of the southern Neotethyan Ocean.

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