Abstract
Abstract The Lycian Nappes, containing ophiolite andsedimentary rocks sequences, crop out in the southwestTurkey. The Tavas Nappe is a part of the Lycian Nappes.It includes the Lower Jurassic-Upper Cretaceous calciturbidites.Chert occurrences were observed in the lower partof this calciturbidite. These cherts can be classified on thebasis of length, internal structure and host rock. Chertbands are 3.20-35.0min length and 7.0-35.0 cm thick. Chertlenses are 5.0-175.0 cm in length and 1.0-33.0 cm thick. Accordingto its internal structure, granular chert (bladedlargeequitant quartz minerals replaced the big calcitemineral of fossil shell) and porcelanious chert (microcrystallinesilica replaced micrite) have been separated. Chertsare generally associated with calcarenite-calcirudite, theothers with calcilutite. Micritic calcite patches of chertspoint out an uncompleted silicification. The source of silicawas dominantly quartz-rich, older, basal rocks and toa lesser extent radiolarians. The coarse-grained calciturbiditesact as a way for silica transportation. Some calciteveins (formed during transportation and emplacement ofnappes) cut both calciturbidites and cherts. Thus, chert occurrencesevolved before emplacement of nappes (the latestCretaceous-Late Miocene period) during the epigeneticphase.
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