High‐Resolution Broadband Lg Attenuation Structure of the Anatolian Crust and Its Implications for Mantle Upwelling and Plateau Uplift
High‐Resolution Broadband Lg Attenuation Structure of the Anatolian Crust and Its Implications for Mantle Upwelling and Plateau Uplift
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DOI：
10.1029/2023gl103470
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发表时间：
2023-03
影响因子：
5.2
通讯作者：
Weiwei Zhu;Lian‐Feng Zhao;Xiao-Bi Xie;Xi He;Lei Zhang;Z. Yao
中科院分区：
文献类型：
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作者：
Weiwei Zhu;Lian‐Feng Zhao;Xiao-Bi Xie;Xi He;Lei Zhang;Z. Yao
安纳托利亚高原目前正经历着快速的隆升和西逃，记录了洋俯冲的终止和向大陆碰撞的转变。通过地震速度和衰减结构可以推断出俯冲环境从安纳托利亚东部向西部转变的地壳响应。通过这项研究，我们构建了安纳托利亚高原的宽带Lg波衰减模型，并用它来约束与这种转变相关的横向地壳非均质性。地壳Lg衰减通过岩石圈热结构特征将晚新生代岩浆活动与软流圈上升流联系起来。在安纳托利亚东部观测到的广泛分布的强衰减可能与Bitlis板块剥离和断裂后地幔上升流引起的地壳部分熔融有关。安纳托利亚中部岩石圈的滴水可能促进了地幔通过塞浦路斯板块和爱琴海板块之间的窗口流动，从而导致安纳托利亚中部的QLg ${Q}_{\mathit{Lg}}$异常。
The Anatolian Plateau, currently experiencing rapid uplift and westward escape, records both the termination of oceanic subduction and the conversion to continental collision. The crustal response to the transition of the subduction environment from eastern to western Anatolia can be inferred by the seismic velocity and attenuation structures. With this study, we construct a broadband Lg‐wave attenuation model for the Anatolian Plateau and use it to constrain lateral crust heterogeneities linked to this transition. Crustal Lg attenuation links late Cenozoic magmatism with asthenospheric upwelling by characterizing the lithospheric thermal structure. The widely distributed strong attenuation observed in eastern Anatolia may be related to the crustal partial melting due to mantle upwelling after the delamination and subsequent break‐off of the Bitlis slab. Lithospheric dripping in central Anatolia likely facilitates the mantle flows through the window between the Cyprus and Aegean slabs, which results in the piecemeal low QLg ${Q}_{\mathit{Lg}}$ anomaly in central Anatolia.