Drainage response to Arabia–Eurasia collision: Insights from provenance examination of the Cyprian Kythrea flysch (Eastern Mediterranean Basin). (23rd April 2020)

• Record Type: Journal Article
• Authors: Shaanan, Uri; Avigad, Dov; Morag, Navot; Güngör, Talip; Gerdes, Axel
• Is Part Of: Basin research. Volume 33:Number 1(2021)
• Page Start: 26
• Page End: 47
• Publication Date: 2020-04-23
• Subjects: Anatolian Block -- Cyprus -- Eastern Mediterranean Basin -- Kyrenia Range -- Kythrea Group -- palaeodrainage -- provenance; Sedimentation and deposition -- Periodicals; Sedimentary basins -- Periodicals; 551
• DOI: 10.1111/bre.12452
• Languages: English
• ISSNs: 0950-091X

Abstract

Abstract: The Cenozoic geodynamics of the north‐eastern Mediterranean Basin have been dominated by the subduction of the African Plate under Eurasia. A trench‐parallel crustal‐scale thrust system (Misis–Kyrenia Thrust System) dissects the southern margin of the overriding plate and forms the structural grain and surface expression of northern Cyprus. Late Eocene to Miocene flysch of the Kythrea (Değirmenlik) Group is exposed throughout northern Cyprus, both at the hanging‐wall and foot‐wall of the thrust system, permitting access to an extensive Cenozoic sedimentary record of the basin. We report the results of a combined examination of detrital zircon and rutile U–Pb geochronology (572 concordant ages), coupled with Th/U ratios, Hf isotopic data and quantitative assessment of grain morphology of detrital zircon from four formations (5 samples) from the Kythrea flysch. These data provide a line of independent evidence for the existence of two different sediment transportation systems that discharged detritus into the basin between the late Eocene and late Miocene. Unique characteristics of each transport system are defined and a sediment unmixing calculation is demonstrated and explained. The first system transported almost exclusively North Gondwana‐type, Precambrian‐aged detrital zircon sourced from siliciclastic rock units in southern Anatolia. A different drainage system is revealed by the middle to late Miocene flysch sequence that is dominated by Late Cretaceous–Cenozoic‐aged detrital zircon, whose age range is consistent with the magmatic episodicity of southeast Anatolia, along the Arabia–Eurasia suture zone. Deposition of these late Miocene strata took place thereupon closure of the Tethyan Seaway and African–Eurasian faunal exchange, and overlap in time with a pronounced uplift of eastern Anatolia. Our analytical data indicate the onset of prominent suture‐parallel sediment transport from the collision zone of south‐eastern Anatolia into the Kyrenia Range of northern Cyprus, marking the drainage response to the continental collision between Arabia and Eurasia. Abstract : A combined examination of detrital zircon and rutile U–Pb geochronology, coupled with Th/U ratios, Hf isotopic data and quantitative assessment of grain morphology of detrital zircon from the Kythrea flysch (northern Cyprus) provides a line of independent evidence for the existence of two different sediment transportation systems that discharged detritus from southern and southeast Anatolia into the northeastern Mediterranean Basin between the late Eocene and late Miocene. Unique characteristics of each transport system are defined and a sediment unmixing calculation is demonstrated and explained. The analytical data indicate the onset of prominent suture‐parallel sediment transport from the collision zone of south‐eastern Anatolia to northern Cyprus, marking the drainage response to the continental collision between Arabia and Eurasia.