Post‐20 Ma Motion of the Adriatic Plate: New Constraints From Surrounding Orogens and Implications for Crust‐Mantle Decoupling

Post‐20 Ma Motion of the Adriatic Plate: New Constraints From Surrounding Orogens and Implications for Crust‐Mantle Decoupling
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20世纪后亚得里亚海板块运动:来自周围造山带的新约束及其对壳幔脱钩的影响

DOI:
10.1002/2016tc004443
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发表时间:
2017
期刊:
影响因子:
4.2
通讯作者:
K. Ustaszewski
K. Ustaszewski
中科院分区:
地球科学1区
文献类型:
--
作者:
Le Breton E;M.R. Handy;G. Molli;K. Ustaszewski

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一个新的运动学重建,包括亚平宁山脉,阿尔卑斯山,Dinarides和西西里海峡裂谷带(SCRZ)20 Ma后的缩短和伸展的估计,揭示了亚得里亚海微板块(Adria)逆时针旋转,因为它俯冲到欧洲板块的西部和东部,而向北缩进阿尔卑斯山。最小和最大旋转量分别通过使用地壳沿SCRZ的延伸(最小值为沿着30 km)、东阿尔卑斯山的地壳缩短(最小值为115 km)以及阿德里亚和莫伊特之间跨越南迪纳里德斯和喀尔巴阡巴尔干半岛的造山带的最大收敛量(140 km)的估计值得出。当与西阿尔卑斯山的新第三纪会聚相结合时,可用结构数据的最佳拟合限制了阿德里亚自20 Ma以来已向西北方向移动113公里(方位角325°),同时相对于欧洲逆时针旋转5 ± 3°。我们的新模型预测的板块会聚量超过了亚平宁山脉和迪纳里德斯山脉上第三纪几十公里的缩短估计。我们将这种差异归因于亚平宁山脉回滚过程中的壳幔解耦(脱层)以及与南部Dinarides和欧洲(Moxos)之间的Dacia单元向北运动相关的分布式变形。上第三纪亚德里亚板块的运动是由于非洲从南部推挤、亚得里亚海-希腊板块向东北方向拉,以及西阿尔卑斯山脉的地壳楔入,这些因素共同作用的结果,西阿尔卑斯山脉充当了一个支点,阻止了亚德里亚相对于欧洲向西北方向的进一步运动。
A new kinematic reconstruction that incorporates estimates of post‐20 Ma shortening and extension in the Apennines, Alps, Dinarides, and Sicily Channel Rift Zone (SCRZ) reveals that the Adriatic microplate (Adria) rotated counterclockwise as it subducted beneath the European Plate to the west and to the east, while indenting the Alps to the north. Minimum and maximum amounts of rotation are derived by using, respectively, estimates of crustal extension along the SCRZ (minimum of 30 km) combined with crustal shortening in the Eastern Alps (minimum of 115 km) and a maximum amount (140 km) of convergence between Adria and Moesia across the southern Dinarides and Carpatho‐Balkan orogens. When combined with Neogene convergence in the Western Alps, the best fit of available structural data constrains Adria to have moved 113 km to the NW (azimuth 325°) while rotating 5 ± 3° counterclockwise relative to Europe since 20 Ma. Amounts of plate convergence predicted by our new model exceed Neogene shortening estimates of several tens of kilometers in both the Apennines and Dinarides. We attribute this difference to crust‐mantle decoupling (delamination) during rollback in the Apennines and to distributed deformation related to the northward motion of the Dacia Unit between the southern Dinarides and Europe (Moesia). Neogene motion of Adria resulted from a combination of Africa pushing from the south, the Adriatic‐Hellenides slab pulling to the northeast, and crustal wedging in the Western Alps, which acted as a pivot and stopped farther northwestward motion of Adria relative to Europe.
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