Date

2016-04-11

Author

Bozkurt, Erdin

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Afyon Zone in the Anatolide-Tauride block is represented by a Pan-African metamorphic basement and unconformably overlying lower Triassic-lower Tertiary low-grade metamorphic cover rocks. The cover sequences commences with a thick basal metaconglomerate. It comprises two distinct lithologies, characterized by quartz pebbles and carbonate pebbles, and grades into a wine red-purple-reddish-gray-mottled metaclastic sequence, made up of a sandstone-shale-mudstone and quartzite alternation. The grain size decreases upwards and clayey limestone becomes dominant with an increase in carbonate content. The cover rocks are composed dominantly of dolomitic limestones at the top; metacarbonates contain Rozetta marbles and chert intercalations. The age of the metaconglomerates above the metamorphic rocks and overlying metaclastic sequence is considered as Scythian, although the supporting evidence is scarce. Hence, a detailed and systematic geochronologic campaign (U-Pb analyses on detrital zircons) has been carried out to determine the age and provenance of cover rocks in the Afyon Zone. Neoproterozoic zircons (54.5%) form the most abundant concordant (90-110%) zircon population while Palaeozoic (13.7%) and Palaeoproterozoic (12.8%) zircons form the other important populations. The presence of Mezoproterozoic (8.6%) and Archean (5.5%) zircons is also important to note. Abundant Triassic (4.3%) and rare Jurassic zircons suggest that the maximum depositional age of the metaclastic sequence is late Triassic (Rhaetian) - early Triassic. The new age data have important tectonic implications, because the metaclastic rocks are correlated with the opening of the northern branch of Neotethyan ocean. The abundance of Edicaran and Cryogenian (40.0%) zircons, co-existence of Tonian (14.5%) and Sitenian (6%) detrital zircons, the presence of Palaeoproterozoic (12.8%) and Mezoproterozoyik (8.6%) zircons are consistent with Avalonian-Cadomian magmatic arc located in the north of Gondwana super-continent and Arabian-Nubian shield as the source areas. Archean zircons supports this hypothesis; they can be derived from Sahara Metacraton and West African Craton. Similarly, the Precambrian zircons may well be derived from the Menderes Massif orthogneisses and metamorphic basement of the Afyon Zone. Menderes Massif may also be suggested as a source area for Cambrian, Ordovician and Permian zircons. Ordovician zircons may come from the Sakarya Continent as well. Devonian and Carboniferous zircons must be derived from Sakarya Continent, Cyclades or Rhodope Massif because they are not reported from the Anatolide-Tauride block

Subject Keywords

Detrital zircon, U-Pb geochronology, Afyon zone, Neotethys, Kırıntılı zirkon, U-Pb jeokronolojisi, Afyon zonu, Neotetis

URI

https://hdl.handle.net/11511/87281
https://www.jmo.org.tr/resimler/ekler/7766896b54c1cc1_ek.pdf

Collections

Department of Geological Engineering, Conference / Seminar