Alpine inversion of the North African margin and delamination of its continental lithosphere
Alpine inversion of the North African margin and delamination of its continental lithosphere
复制标题
北非边缘的高山反转及其大陆岩石圈的分层
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
B. Addoum
中科院分区：
文献类型：
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作者：
F. Roure;P. Casero;B. Addoum
本文旨在总结北非前中生代被动边缘的当前范围和结构，从西部的阿尔及利亚北部到东部的爱奥尼亚-卡拉布里亚弧和邻近的地中海海岭。尽管大多数古地理模型认为整个东地中海盆地仍然位于二叠纪-三叠纪或更年轻的白垩纪特提斯-中海洋的残余物之下，但撒哈拉地图集、西西里海峡和爱奥尼亚深海平原之间的结构样式和反转时间的强烈相似性证明东地中海盆地的这一部分仍然属于北非大陆边缘的远端部分。从东部的土耳其和塞浦路斯、克里特岛陆上、希腊的品多斯岛和阿尔巴尼亚的米尔迪塔，以及西部的西阿尔卑斯山、科西嘉岛和南亚平宁山脉，也可以或多或少连续地追踪到特提斯蛇绿岩单元的边缘，这支持了普利亚/亚得里亚海域和东地中海盆地仍然属于特提斯洋前南大陆边缘的假说。由于没有明确的证据表明地壳尺度的断层抵消了莫霍面，但更有可能是在地中海弧下的前陆和腹地之间延伸的连续但折叠的莫霍面，我们在这里提出了亚平宁山脉和爱琴海弧大陆岩石圈分层的新模型。在这个模型中，只有普利亚和东地中海的地幔岩石圈仍然局部俯冲并在软流圈中再循环，非洲地壳北部的大部分（如果不是全部）和同时代的莫霍面目前正在与其以前的、目前分层和俯冲的地幔岩石圈脱钩。
This paper aims at summarizing the current extent and architecture of the former Mesozoic passive margin of North Africa from North Algeria in the west up to the Ionian‐Calabrian arc and adjacent Mediterranean Ridge in the east. Despite that most paleogeographic models consider that the Eastern Mediterranean Basin as a whole is still underlain by remnants of the Permo‐Triassic or a younger Cretaceous Tethyan‐Mesogean ocean, the strong similarities documented here in structural styles and timing of inversion between the Saharan Atlas, Sicilian Channel and the Ionian abyssal plain evidence that this portion of the Eastern Mediterranean Basin still belongs to the distal portion of the North African continental margin. A rim of Tethyan ophiolitic units can be also traced more or less continuously from Turkey and Cyprus in the east, in onshore Crete, in the Pindos in Greece and Mirdita in Albania, as well as in the Western Alps, Corsica and the Southern Apennines in the west, supporting the hypothesis that both the Apulia/Adriatic domain and the Eastern Mediterranean Basin still belong to the former southern continental margin of the Tethys. Because there is no clear evidence of crustal‐scale fault offsetting the Moho, but more likely a continuous yet folded Moho extending between the foreland and the hinterland beneath the Mediterranean arcs, we propose here a new model of delamination of the continental lithosphere for the Apennines and the Aegean arcs. In this model, only the mantle lithosphere of Apulia and the Eastern Mediterranean is still locally subducted and recycled in the asthenosphere, most if not all the northern portion of the African crust and coeval Moho being currently decoupled from its former, currently delaminated and subducted mantle lithosphere.