A single cause for uplift of the Central and Eastern Anatolian plateau?
A single cause for uplift of the Central and Eastern Anatolian plateau?
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DOI：
10.1016/j.tecto.2014.10.002
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发表时间：
2014-12-10
期刊：
影响因子：
2.9
通讯作者：
Govers, R.
中科院分区：
文献类型：
--
作者：
Bartol, J.;Govers, R.
区域观测表明，自托托阶以来，安纳托利亚中部高原（土耳其中部）已上升>1公里（类似于8 Ma），而地壳并未发生显着缩短。这一隆起之前，广泛的火山活动（类似于14-9马）的开始。这些事件的岩石圈背景是未知的。对于东安纳托利亚高原，类似的事件已被归因于晚期演化的北方新特提斯板块，导致分层和板breakofE最近的层析结果表明，这板延伸到下面的东部和中部安纳托利亚高原就在分层。我们提出了一个新的岩石圈方案的区域演化在爱琴海-安纳托利亚-近东地区，结合最近的汇编地表地质数据与上地幔的结构。在北方新特提斯的俯冲-始新世闭合之后，位于安纳托利亚南部的海沟的水平俯冲作用使非洲-欧亚大陆的汇聚得以适应。与闭合之前一样，北方新特提斯板块继续沉入伊兹密尔-安卡拉-埃尔津坎缝合线下方的更深地幔。中新世早期（约20-15 Ma），新特提斯北方板片开始向南退缩至海沟，导致岩石圈地幔拆沉。这种情况的最后一部分是可以检验的，分层是否可以解释中部和东部安纳托利亚高原的隆起。在东部，由于阿拉伯碰撞的隆升。我们使用耦合的岩石圈热挠曲模型。模型结果表明，分层可以解释平均现今的长波长地形的中安纳托利亚高原。对于东安纳托利亚高原，分层解释了现今海拔的一半。我们发现，一个单一的分层事件也占了现今的表面热流和居里点深度在两个高原。因此，我们建议自中新世中期以来将安纳托利亚中部和东部称为“安纳托利亚高原”。(C)2014爱思唯尔有限公司版权所有。
Regional observations suggest that the Central Anatolian plateau (central Turkey) has risen by >1 km since the Tortonian (similar to 8 Ma) while significant crustal shortening did not occur. This uplift was preceded by the onset of widespread volcanism (similar to 14-9 Ma). The lithospheric context of these events is however unknown. For the Eastern Anatolian plateau, similar events have been attributed to the late-stage evolution of the northern Neotethys slab, resulting in delamination and slab breakofE Recent tomographic results indicate that this slab extended beneath both below the Eastern and Central Anatolian plateau just prior to delamination. We propose a new lithospheric scenario for the regional evolution in the Aegean-Anatolian-Near East region that combines a recent compilation of surface geology data with the structure of the upper mantle. Following the Cretaceous-Eocene closure of the northern Neotethys, Africa-Eurasia convergence was accommodated by horizontal subduction at a trench that was located south of Anatolia. Like before the closure, the northern Neotethys slab continued to sink into the deeper mantle beneath the Izmir-Ankara-Erzincan suture. In the early Miocene (similar to 20-15 Ma), the northern Neotethys slab started to retreat southward to the trench, resulting in delamination of the lithospheric mantle. The last part of this scenario is testable, whether delamination can explain the uplift of both the Central and Eastern Anatolian plateau. In the east, uplift due to collision of Arabia is included. We use a coupled thermal-flexural model of the lithosphere. The model results show that delamination can explain the average present-day long-wavelength topography of the Central Anatolian plateau. For the Eastern Anatolian plateau, delamination explains half the present-day elevation. We find that a single delamination event also accounts for the present-day surface heat flow and Curie-point depth in both plateaus. We therefore propose to refer to central and east Anatolia since the middle Miocene as "the Anatolian plateau". (C) 2014 Elsevier B.V. All rights reserved.