Palaeomagnetism and palaeogeography of Adria
Palaeomagnetism and palaeogeography of Adria
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阿德里亚的古地磁和古地理
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发表时间：
1996
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通讯作者：
J. Channell
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文献类型：
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作者：
J. Channell
摘要将基于北美旋转资料的“非洲”中生代视极漂移路径（APWP）与亚德里亚及周边地区的古地磁资料进行了比较。来自南阿尔卑斯山、翁布里亚-马尔凯（意大利）和外多瑙河中部山脉（匈牙利）的APWP的形式与“非洲”APWP相似。翁布里亚-马尔切和外多瑙河APWP相对于非洲APWP发生了旋转，其旋转最好的解释是，翁布里亚-马尔切西北部和外多瑙河地区的局部逆时针旋转分别为20°和30°。南阿尔卑斯山的二叠纪至白垩纪古磁极与非洲APWP没有明显区别。最近从伊斯特拉岛得到的白垩纪极点，从伊布雷（西西里）、加尔加诺和阿普利亚得到的白垩纪极点，在数据的置信范围内，都与非洲的APWP一致。爱奥尼亚海/东地中海的裂谷要么早于主要的侏罗纪-白垩纪古地磁数据集，要么没有产生亚德里亚相对于非洲的可识别的旋转。在中生代，北钙质阿尔卑斯山脉通常被认为与南阿尔卑斯山脉相邻，然而，NCA （Liassic）极点更接近欧洲的同时期极点，并且相对于非洲APWP逆时针旋转超过80°。北钙质阿尔卑斯山脉可能在晚三叠纪和侏罗纪时期与南阿尔卑斯山脉分离，并没有经历影响亚德里亚的“非洲”旋转。
Abstract An ‘African’ Mesozoic apparent polar wander path (APWP) based on rotated North American data is compared with palaeomagnetic data from Adria and surrounding regions. The form of the APWPs from the Southern Alps, Umbria-Marche (Italy) and the Transdanubian Central Range (Hungary) is similar to that of the ‘African’ APWP. The Umbria-Marche and Transdanubian APWPs are rotated relative to the African APWP, and the rotation is best explained by local anticlockwise tectonic rotations of 20° and 30° for the NW Umbria-Marche and Transdanubian regions, respectively. Permian to Cretaceous palaeomagnetic poles from the Southern Alps are not distinguishable from the African APWP. The more recently derived Cretaceous poles from Istria, Cretaceous poles from Iblei (Sicily), Gargano and Apulia are all consistent, within the confidence limits of the data, with the African APWP. Rifting in the Ionian Sea/Eastern Mediterranean either predated the mainly Jurassic-Cretaceous palaeomagnetic dataset or did not produce recognizable rotation of Adria relative to Africa. The Northern Calcareous Alps are often considered to have been contiguous with the Southern Alps during the Mesozoic, however, the NCA (Liassic) poles are closer to coeval poles for Europe, and are rotated in excess of 80° clockwise relative to the African APWP. The Northern Calcareous Alps were probably detached from the Southern Alps during Late Triassic and Jurassic time, and did not undergo the ‘African’ rotation which affected Adria.