首页|Latest Carboniferous-Early Permian Rifting of the Northern Gondwanan Margin and the Opening of the Northern Neotethys:New Evidence from the Carboniferous and Permian Foraminiferal Assemblages from the Bey?ehir-Hoyran Nappes,Central Taurides(Southern Turkey
Latest Carboniferous-Early Permian Rifting of the Northern Gondwanan Margin and the Opening of the Northern Neotethys:New Evidence from the Carboniferous and Permian Foraminiferal Assemblages from the Bey?ehir-Hoyran Nappes,Central Taurides(Southern Turkey
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The Beyşehir-Hoyran Nappes,one of the tectonostratigraphic units of the Taurides,are thought to be originated from the Izmir-Ankara Ocean(northern branch of Neotethys).In this study,Late Paleozoic rock units from the blocks of Beyşehir-Hoyran Nappes were studied in detail using fora-miniferal assemblages in two different locations from the southwest of Karaman City(southern Tur-key).In both places,blocks/slices and pebbles of various origins are embedded within a highly sheared matrix of Late Cretaceous Age,and the whole unit can be regarded as a sedimentary mélange.The ages of the blocks from the southwest of Karaman City range from the Late Serpukhovian(Late Mississippi-an)to Late Capitanian(Middle Permian)with some depositional breaks(e.g.,Bashkirian,Kasimovian).Combined with the previous data from the Mersin Mélange,which also include the remnants of the Beyşehir-Hoyran Nappes,our new findings suggest that a shallowing-upward sequence,characterized by a shallow water environment with foraminifera-bearing limestones,was deposited over the Tournai-sian pelagic sequence in the Beyşehir-Hoyran Nappes till the Early Moscovian(Early Middle Pennsylva-nian).This shallowing-upward sequence in the Beyşehir-Hoyran Nappes could be related to the Late Pa-leozoic Glaciation on the Gondwana supercontinent(Glacial Ⅱ),which resulted in a sea-level drop and deposition of platform carbonates during the Viséan-Early Moscovian(Middle Mississippian to Early Middle Pennsylvanian)time interval.The absence of the main part of the Middle-Upper Pennsylvanian deposits(continental phase during the Middle Moscovian-Middle Gzhelian)in the Beyşehir-Hoyran Nappes can be mainly attributed to the occurrence of a mantle plume and partially to the effect of Late Paleozoic Gondwanan Glaciation(Glacial Ⅲ).Progressive uplifting by the buoyant mantle plume mate-rial has resulted in rifting at the center of the basin where the Beyşehir-Hoyran Nappes have deposited.The rifting process led to tectonic destabilization of the platform in the basin,causing accumulation of the Upper Gzhelian(uppermost Pennsylvanian)detrital limestone with broken and abraded foraminif-eral shells.Following this,deep basinal conditions prevailed during the Late Asselian-Kungurian(Early Permian),as revealed in the Mersin Mélange,where radiolarian cherts are associated with continental within-plate lavas of extreme incompatible trace element enrichment.Similar processes were responsi-ble for the continual deposition of detrital limestones in the same basin until the end of Late Capitanian(Middle Permian).Based on all these,the uplifting process followed by rift-related volcanic rocks and detrital limestones can be interpreted as the opening of the Izmir-Ankara Ocean(northern Neotethys).
foraminiferaCarboniferous and PermianBeyşehir-Hoyran NappesplumeriftingNeotethyspaleontology
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