P–T–t evolution of eclogite/blueschist facies metamorphism in Alanya Massif: time and space relations with HP event in Bitlis Massif, Turkey
P–T–t evolution of eclogite/blueschist facies metamorphism in Alanya Massif: time and space relations with HP event in Bitlis Massif, Turkey
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DOI：
10.1007/s00531-014-1092-8
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发表时间：
2014
影响因子：
2.3
通讯作者：
M. Çetinkaplan;A. Pourteau;O. Candan;O. E. Koralay;R. Oberhänsli;A. Okay;Fukun Chen;H. Kozlu;F. Şengün
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文献类型：
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作者：
M. Çetinkaplan;A. Pourteau;O. Candan;O. E. Koralay;R. Oberhänsli;A. Okay;Fukun Chen;H. Kozlu;F. Şengün
阿拉尼亚地块位于土耳其陶里德斯中部以南，是一个典型的推覆体，由具有不同变质历史的逆冲岩席组成。在Sugözü和Gündoetz两个逆冲推覆岩片中，分别在榴辉岩相（550-567 °C/14-18 kbar）和蓝片岩相（435-480 °C/11-13 kbar）条件下识别出高压变质作用。而地块的其余部分在绿片岩到角闪岩相（525-555 °C/6.5-7.5 kbar）条件下经历了MP变质作用。苏格祖推覆体中榴辉岩相变质作用由石榴子石-蓝闪石-多硅白云母片岩组成，均质，具榴辉岩透镜体。采用40 Ar/39 Ar多硅白云母、锆石U/Pb和金红石定年方法，对苏格祖推覆体中榴辉岩相变质作用的年龄分别为84.8 ± 0.8、84.7 ± 1.5和82 ± 3 Ma（Santonian-Campanian期）。类似地，Gündoel-mu-tuppe中代表增生杂岩的多硅白云母产生了82-80 Ma（Campanian）的蓝片岩相变质年龄。在折返过程中，在绿片岩-角闪岩相条件下的HP单元的逆行叠加和与Barrovian单元的构造并列发生在Campanian（75-78 Ma）。岩石学和年代学数据清楚地表明，阿拉尼亚（84-75 Ma）和Bitlis（84-72 Ma）地块的晚白垩世构造变质演化相似。它们形成了一个单一的大陆长条（阿拉尼亚-比特利斯微大陆）的一部分，该大陆长条是从阿纳托利德-陶里德地台的南部断裂的。两个地块之间的P-T-t相干性表明，这两个地块都是由位于Anatolide-Tauride地块南部的同一个海洋（Alanya-Bitlis海洋）通过向北俯冲而闭合而形成的。北部的土赖德台地与南部的阿拉尼亚和比特里斯地块之间的边界代表了一个缝合带，即潘菲利安-阿拉尼亚-比特里斯缝合带。
The Alanya Massif, which is located to the south of central Taurides in Turkey, presents a typical nappe pile consisting of thrust sheets with contrasting metamorphic histories. In two thrust sheets, Sugözü and Gündoğmuş nappes, HP metamorphism under eclogite (550–567 °C/14–18 kbar) and blueschist facies (435–480 °C/11–13 kbar) conditions have been recognized, respectively. Whereas the rest of the Massif underwent MP metamorphism under greenschist to amphibolite facies (525–555 °C/6.5–7.5 kbar) conditions. Eclogite facies metamorphism in Sugözü nappe, which consists of homogeneous garnet–glaucophane–phengite schists with eclogite lenses is dated at 84.8 ± 0.8, 84.7 ± 1.5 and 82 ± 3 Ma (Santonian–Campanian) by40Ar/39Ar phengite, U/Pb zircon and rutile dating methods, respectively. Similarly, phengites in Gündoğmuş nappe representing an accretionary complex yield 82–80 Ma (Campanian) ages for blueschist facies metamorphism. During the exhumation, the retrograde overprint of the HP units under greenschist–amphibolite facies conditions and tectonic juxtaposition with the Barrovian units occurred during Campanian (75–78 Ma). Petrological and geochronological data clearly indicate a similar Late Cretaceous tectonometamorphic evolution for both Alanya (84–75 Ma) and Bitlis (84–72 Ma) Massifs. They form part of a single continental sliver (Alanya–Bitlis microcontinent), which was rifted from the southern part of the Anatolide–Tauride platform. TheP–T–tcoherence between two Massifs suggests that both Massifs have been derived from the closure of the same ocean (Alanya–Bitlis Ocean) located to the south of the Anatolide–Tauride block by a northward subduction. The boundary separating the autochthonous Tauride platform to the north from both the Alanya and Bitlis Massifs to the south represents a suture zone,the Pamphylian–Alanya–Bitlis suture.