Abstract The Mersin Melange (MM) as a part of the Mersin Ophiolitic Complex in southern Turkey is a sedimentary complex including blocks and tectonic slices within a Late Cretaceous matrix. Two blocks (Keven and Cingeypinari) within the MM originated from the northern branch of Neotethys (Izmir-Ankara-Erzincan Ocean) and have been studied in detail using foraminiferal assemblages to correlate them with coeval successions in the Taurides and to approach the Early Permian evolution of the northern branch of the Neotethys. The Keven block includes mainly slope deposits (poorly-sorted carbonate breccia and fossiliferous calcarenite) and dated as late Asselian-Sakmarian, whereas the Cingeypinari block consists of platform deposits (fossiliferous platform carbonate and quartz sandstone alternation) assigned to the Sakmarian-early Artinskian. These Early Permian Cingeypinari and Keven blocks from the Beysehir-Hoyran Nappes are biostratigraphically well correlated to the northerly originated Hadim nappe and its equivalents in the Tauride Belt. Considering recent studies on the Mersin Melange, a possible mantle plume existed during the Late Carboniferous-Early Permian time interval along the northern Gondwanan margin. This event led to the opening of the northern Neotethys and deposition of the pelagic “Karincali” sequence with volcanic material in the basinal conditions. The data presented suggest that the Keven block relates to the slope and the Cingeypinari block to platform conditions deposited as a lateral equivalent of the Karincali sequences during the Early Permian.

中文翻译：

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来自土耳其南部 Mersin Mélange 台地斜坡碳酸盐岩块的下二叠纪有孔虫组合的生物地层学：古地理意义

摘要 作为土耳其南部梅尔辛蛇绿岩杂岩的一部分的梅尔辛混杂岩（MM）是一个沉积杂岩，包括晚白垩世基质内的块体和构造切片。MM 内的两个区块（Keven 和 Cingeypinari）起源于 Neotethys 的北部分支（伊兹密尔-安卡拉-埃尔津坎海），并已使用有孔虫组合进行了详细研究，以将它们与 Taurides 的同期演替联系起来，并接近二叠纪早期的演化属于新特提斯的北支。Keven 区块主要包括斜坡沉积物（分选不良的碳酸盐角砾岩和含化石的方解石），年代为 Asselian-Sakmarian 晚期，而 Cingeypinari 区块由属于 Sakmarian-Artinskian 早期的台地沉积物（含化石平台碳酸盐和石英砂岩交替）组成。这些来自 Beysehir-Hoyran Nappes 的早二叠世 Cingeypinari 和 Keven 地块在生物地层学上与北部起源的 Hadim 推覆层及其在 Tauride 带中的等价物密切相关。考虑到最近对 Mersin Melange 的研究，在冈瓦纳大陆北部边缘的晚石炭世-早二叠世时间间隔期间可能存在地幔柱。这一事件导致了新特提斯北部的开放和远洋“Karincali”序列的沉积，在盆地条件下具有火山物质。所提供的数据表明，Keven 地块与斜坡有关，而 Cingeypinari 地块与地台条件相关，沉积为早二叠世期间 Karincali 层序的横向等效物。