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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 >The 125-150 Ma high-resolution Aparent Polar Wander Path for Adria from magneto stratigraphic sections in Umbria-Marche (Northern Apennines, Italy): Timing and duration of the global Jurassic-Cretaceous hairpin turn
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The 125-150 Ma high-resolution Aparent Polar Wander Path for Adria from magneto stratigraphic sections in Umbria-Marche (Northern Apennines, Italy): Timing and duration of the global Jurassic-Cretaceous hairpin turn

机译：来自翁布里亚-马尔什（意大利北部亚平宁山脉）磁层地层的阿德里亚高分辨率125-150 Ma母极极地漂移路径：全球侏罗纪-白垩纪发夹转向的时间和持续时间

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A new high-resolution Apparent Polar Wander Path (APWP) segment has been obtained from the magnetostratigraphy of four Kimmeridgian to Lower Aptian sections in the Northern Apennines (Italy). The use of paleomagnetic data for determination of the Adria APWP was hampered by the large local rotations linked to Apennine tectonics, characterized by folds and thrusts developed during the Neogene. To overcome this problem, we have computed relative rotations between time overlapping sections and realigned them in a common declination reference frame (namely the Bosso section). We synthesized a new high-resolution 150 to 125 Ma APWP for Adria, which has a similar shape to the time-equivalent segment of the synthetic APWP of Africa of Besse and Courtillot [J., Besse, V, Courtillot, Apparent and true polar wander and the geometry of the geomagnetic field over the last 200 Myr, J. Geophys. Res. 107(B 11) (2002), doi: 10. 1029/200JB000050]. A 26 degrees clockwise rotation of our combined Adria APWP places it in almost perfect overlap with African data of same age, confirming that the Adria promontory moved coherently with Africa during this time span, whereas the counterclockwise rotation of Adria with respect to Africa was introduced later, most probably during Apennines orogenesis. Finally, we discuss in relation with worldwide plate evolution the peculiar shape of our APWP, which displays a hairpin turn during Berriasian time, and dates the main Late Jurassic/Early Cretaceous change in plate motion at around anomaly M16. (C) 2007 Elsevier B.V All rights reserved.
机译：从北亚平宁山脉（意大利）的四个基默尼迪安断层到下阿普第断层的地磁学获得了一个新的高分辨率视在极地漫游路径（APWP）段。与亚平宁构造有关的大局部旋转阻碍了使用古磁数据确定阿德里亚APWP，其特征是在新近纪期间形成了褶皱和逆冲。为了克服这个问题，我们计算了时间重叠部分之间的相对旋转，并在一个共同的磁偏角参考坐标系（即Bosso部分）中将它们重新对齐。我们为阿德里亚（Adria）合成了一种新的高分辨率150至125 Ma的APWP，其形状与非洲贝塞斯和科蒂略特合成APWP的时间等效部分相似[J.，Besse，V，Courtillot，Apparent and true polar在最近的200 Myr，J. Geophys中漂移和地磁场的几何形状。 Res。 107（B 11）（2002），doi：10。1029/ 200JB000050]。我们组合的Adria APWP沿顺时针方向旋转26度，使其与同一年龄的非洲数据几乎完全重叠，这证实了Adria海角在这段时间内与非洲连贯地运动，而稍后引入了Adria相对于非洲的逆时针旋转，最有可能在亚平宁山脉造山过程中。最后，我们讨论了与全球板块演化有关的APWP的特殊形状，该形状在Berriasian时期表现出发夹状转弯，并确定了M16前后左右板块运动的主要侏罗纪/早白垩世变化。 （C）2007 Elsevier B.V保留所有权利。

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