Paleomagnetic implications on the evolution of the tethys belt from the atlantic ocean to the pamirs since the triassic
Paleomagnetic implications on the evolution of the tethys belt from the atlantic ocean to the pamirs since the triassic
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三叠纪以来特提斯带从大西洋到帕米尔高原演化的古地磁意义
DOI：
10.1016/0040-1951(86)90193-9
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发表时间：
1986
期刊：
影响因子：
2.9
通讯作者：
J. Sibuet
中科院分区：
文献类型：
--
作者：
M. Westphal;M. Bazhenov;J. P. Lauer;D. Pechersky;J. Sibuet
我们首先重新考察了三叠纪以来稳定的欧亚大陆和非洲大陆的明显极移曲线。根据大西洋的运动学规律，将这些曲线与北美和南美的曲线结合起来，得到了一条合成的极移曲线。然后，分析了从大西洋到帕米尔高原的特提斯活动带的大部分古地磁结果。可以看到几组板，微孔板和块。首先是相对稳定的地区，如马格里布和西西里岛，这些地区没有太大的变化。然后我们有一个由伊比利亚、撒丁岛、意大利以及较小程度上的科西嘉和阿尔卑斯山西部和中部组成的群体。对于这些板块来说，运动主要是由非洲的逆时针旋转驱动的逆时针旋转，但它们有时更强。在东方，发生了重大变化。爱琴海北部和爱奥尼亚带是顺时针旋转的，这些旋转是最近的：第一部分是渐新世-中新世，第二部分是上新世到现在。一个主要问题出现在土耳其、高加索和伊朗。古地磁结果表明其位置远在欧亚大陆以南，同时，地质证据也表明其位置接近欧亚大陆。我们讨论这些差异。
We first re-examined the apparent polar wander curves for stable Eurasia and Africa since the Triassic. These curves were then combined together with curves of North and South America according to the kinematics of the Atlantic ocean and a synthetic polar wander curve was given. Then, most of the paleomagnetic results from the Tethys mobile belt, from the Atlantic to the Pamirs, were analysed.Several groups of plates, microplates and blocks can be seen. First, relatively stable regions like Maghreb and Sicily, which have not moved much. Then we have a group formed by Iberia, Sardinia, Italy and, to a lesser extent, Corsica and the Western and Central Alps. For these blocks, movements are anticlockwise rotations chiefly driven by the anticlockwise rotation of Africa, but they are sometimes stronger.To the east, a major change takes place. The north of the Aegean Sea and the Ionian zone are clockwise rotated and these rotations are recent: Oligocene-Miocene for the first part, Pliocene to the present for the second part.A major problem arises in Turkey, Caucasus and Iran. Paleomagnetic results indicate a position far to the south of Eurasia, and, at the same time, geological evidence is in favour of a position close to Eurasia. We discuss these discrepancies.