The tectonics of the Strandja Massif: late-Variscan and mid-Mesozoic deformation and metamorphism in the northern Aegean
The tectonics of the Strandja Massif: late-Variscan and mid-Mesozoic deformation and metamorphism in the northern Aegean
复制标题
斯特兰贾地块的构造：爱琴海北部晚瓦里斯纪和中生代的变形和变质作用
DOI：
10.1007/s005310000104
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发表时间：
2001
影响因子：
2.3
通讯作者：
F. Chen
中科院分区：
文献类型：
--
作者：
A. Okay;M. Satır;O. Tüysüz;S. Akyüz;F. Chen
Strandja地块是巴尔干半岛的中中生代造山带，建立在晚瓦立斯晚期的片麻岩、混辉岩和花岗岩基底上。片麻岩和花岗岩的新单锆石蒸发年龄表明，高变质作用和深部成矿作用为早二叠世（~ 271 Ma）。晚瓦里斯坎基底被早三叠世—中侏罗世的陆相—浅海相层序不整合覆盖。晚侏罗世—早白垩世（牛津—巴雷米亚期），下中生代盖层和基底可能受大陆碰撞作用，在绿片岩相中发生穿透变形和区域变质作用。变质岩的Rb-Sr黑云母全岩年龄表明区域变质作用为晚侏罗世（155 Ma）。变形过程包括基底北向逆冲叠瓦作用和异域深海相三叠纪对侏罗纪变质沉积的侵位作用。斯特兰加地块的变质岩被塞诺曼尼亚浅海相砂岩不整合覆盖。塞宁世期间，斯特兰加地块北半部形成了弧内盆地和向北俯冲的特提斯洋岩石圈上形成的岩浆弧的基底。斯雷诺戈里弧在第三纪早期通过斯特兰加地块的重新北冲而闭合。
The Strandja Massif is a mid-Mesozoic orogenic belt in the Balkans build on a late-Variscan basement of gneisses, migmatites and granites. New single-zircon evaporation ages from the gneisses and granites indicate that the high-grade metamorphism and plutonism is Early Permian in age (∼271 Ma). The late-Variscan basement was unconformably overlain by a continental to shallow marine sequence of Early Triassic–Mid-Jurassic age. During the Late Jurassic–Early Cretaceous (Oxfordian–Barremian) the lower Mesozoic cover and the basement were penetratively deformed and regionally metamorphosed in greenschist facies possibly due to a continental collision. An Rb–Sr biotite whole-rock age from a metagranite dates the regional metamorphism as Late Jurassic (155 Ma). Deformation involved north-vergent thrust imbrication of the basement and the emplacement of allochthonous deep marine Triassic series over the Jurassic metasediments. The metamorphic rocks of the Strandja Massif are unconformably overlain by the Cenomanian shallow marine sandstones. During the Senonian, the northern half of the Strandja Massif formed a basement to an intra-arc basin and to a magmatic arc generated above the northward-subducting Tethyan oceanic lithosphere. The Srednogorie arc closed during the early Tertiary through renewed northward thrusting of the Strandja Massif.