萨摩斯岛中新世晚期至上新世大陆序列的重建:对爱琴海东部地区的古环境影响

IF 1.9 3区 地球科学 Q1 GEOLOGY Depositional Record Pub Date : 2023-08-16 DOI:10.1002/dep2.249
Youri Hamon, Rémy Deschamps, Christian Gorini, Dimitris Sakellariou, Cédric Bailly, Tarik Kernif, Alina Bérénice Christ, Mathilde Adelinet, Jérôme Fortin
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引用次数: 0

摘要

在萨摩斯岛(希腊东爱琴海地区),两个沉积盆地被中新世晚期至上新世早期的厚大陆系填满。进行了一项多学科研究,包括1)21个沉积相的定义,2)生物成分的回顾,以及3)碳、氧和锶稳定同位素分析。该层序以各种沉积环境和水化学成分为特征。确定了盆地演化的五个主要阶段:1)塞拉瓦阶晚期以冲积扇和扇三角洲的发育为标志;2) 在下托尔托尼亚期,在温暖和相对潮湿的条件下形成了盐度从新鲜到微咸不等的孤立浅水湖;3) 托托尼亚中上游的特点是,在寒冷和干燥的条件下,形成了一个大而深的湖泊,湖泊中有盐碱水;4) 托托尼亚-墨西尼安晚期以在干燥气候下发育的短暂冲积系统为代表;5) 赞clean时期,在中等湿润条件下形成了以凝灰岩碳酸盐岩为主的沼泽和沼泽湿地系统。这一演替对于重建地中海域与准特提斯和环准特提斯地区之间过渡带的古环境演化特别重要。地球化学数据以及具有海洋亲缘关系的动植物(硅藻)和动物(腹足类)的存在表明,早在下托托阶,与海洋有关的水或地下水就曾短暂流入。萨摩斯演替记录了区域地球动力学与气候之间复杂的相互作用。爱琴海东部地区的伸展机制产生了沉降,在托托里阶中期(9 Ma),由于短暂的压缩事件和盆地的主要暴露而中断。此外,中新世晚期的渐进干旱化,随后向更潮湿的气候变化(上新世)也是沉积的主要驱动因素。
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Reconstruction of the Late Miocene to Pliocene continental succession of Samos Island: Palaeoenvironmental implications for the Eastern Aegean domain

On the Island of Samos (East Aegean region, Greece), two sedimentary basins are filled by thick continental series dated to the Late Miocene to Early Pliocene. A multidisciplinary study has been performed including (1) the definition of 21 sedimentary facies, (2) a review of the biological components and (3) carbon, oxygen and strontium stable isotope analyses. The succession is characterised by various depositional settings and hydrochemical compositions. Five main stages of basin evolution have been identified: (1) The Late Serravallian is marked by the development of alluvial fans and fan delta; (2) during the Lower Tortonian, isolated shallow lakes with variable salinity, from fresh to brackish, developed under warm and relatively humid conditions; (3) the Middle to Upper Tortonian is marked by the development of a large and deep lake with saline and alkaline waters, under colder and drier conditions; (4) the Latest Tortonian to Messinian period is represented by an ephemeral alluvial system, developed under a dry climate; (5) during the Zanclean, a palustrine and paludal wetland system, dominated by tufa carbonates, developed under moderately humid conditions. This succession is of particular interest for the reconstruction of the palaeoenvironmental evolution of the transition zone between the Mediterranean domain, and the Paratethys and circum-Paratethys areas. The geochemical data and the presence of flora (diatoms) and fauna (gastropods) of marine affinity suggest transient ingressions of marine-related water or groundwater inflows as early as the Lower Tortonian. The Samos succession records the complex interaction between the regional geodynamics and climate. The extensional regime of the Eastern Aegean zone generates subsidence, interrupted in the mid-Tortonian (9 Ma) by a brief compressive event and a major exposure of the basins. Furthermore, the Late Miocene progressive aridification, followed by a change to a more humid climate (Pliocene) is also a major driver of the sedimentation.

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来源期刊
CiteScore
4.10
自引率
16.70%
发文量
42
审稿时长
16 weeks
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