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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Miocene rotation of Sardinia: New paleomagnetic and geochronological constraints and geodynamic implications
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Miocene rotation of Sardinia: New paleomagnetic and geochronological constraints and geodynamic implications

机译：撒丁岛的中新世旋转：新的古地磁和年代学约束及其对地球动力学的影响

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摘要

The Miocene rotation of Sardinia (Western Mediterranean) remains poorly constrained despite a wealth of paleomagnetic data, primarily due to poor chronostratigraphic control. However, this rotation is contemporaneous with the opening of the Liguro-Provencal back-arc oceanic basin, and its history is key to understanding the kinematics of opening of the Western Mediterranean. We address this issue through paleomagnetic and Ar-40/Ar-39 geochronological investigations of Miocene volcanic sequences in Sardinia. Precise age control allows secular variation of the geomagnetic field to be evaluated. These data provide constraints on the rotational history of this continental microplate; Sardinia rotated 45 degrees counterclockwise with respect to stable Europe after 20.5 Ma (Aquitanian), which is a marked increase over the estimate of 30 degrees derived from prior paleomagnetic studies. Rotation was essentially complete by 15 Ma. About 30 degrees of rotation occurred between 20.5 and 18 Ma (Burdigalian), corresponding to the period of maximum volcanic activity in Sardinia. The observed rotation validates palinspastic models derived from a morphological fit of basin margins, and indicates high rates of opening (up to 9 cm yr(-1) in the southern part of the basin) between 20.5 and 18 Ma. (c) 2007 Elsevier B.V. All rights reserved.
机译：尽管古地磁资料丰富，但主要由于年代地层控制不力，撒丁岛（地中海南部）的中新世自转仍然受限制。但是，这种旋转与利古罗-普罗旺斯后弧海盆的开放同时进行，其历史是了解西地中海开放运动学的关键。我们通过撒丁岛中新世火山序列的古磁性和Ar-40 / Ar-39年代学调查来解决这个问题。精确的年龄控制可以评估地磁场的长期变化。这些数据限制了该大陆微板块的旋转历史。撒丁岛在20.5 Ma（阿基坦）之后相对于稳定的欧洲逆时针旋转了45度，这比以前的古磁研究估计的30度明显增加。旋转到15 Ma基本完成。在20.5至18 Ma（布尔迪加利安）之间发生了大约30度的旋转，这对应于撒丁岛的最大火山活动期。观测到的旋转验证了盆地边缘形态拟合得出的古痉挛模型，并表明在20.5至18 Ma之间有很高的打开率（盆地南部高达9 cm yr（-1））。 （c）2007 Elsevier B.V.保留所有权利。

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