Paleomagnetism and the tectonic evolution of the Ionian zone, northwestern Greece
Paleomagnetism and the tectonic evolution of the Ionian zone, northwestern Greece
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希腊西北部爱奥尼亚地区的古地磁学和构造演化
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发表时间：
2006
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通讯作者：
S. Matthews
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作者：
L. Broadley;E. Platzman;J. Platt;M. Papanikolaou;S. Matthews
爱奥尼亚带是一个典型的薄皮线性褶皱和冲断带，形成了希腊最西部的外部Hellenides的一部分。自20世纪80年代初以来，该地区一直是密集的古地磁研究的焦点，现在普遍认为自中新世以来，该地区经历了40°-60°的多阶段顺时针垂直轴旋转，尽管时间存在争议，而且迄今为止，这一趋势的空间变化在很大程度上被忽略了。我们目前的数据从30个新的古地磁网站和重新评估以前的结果，从爱奥尼亚带，试图建立一个统一的模式的构造演化的爱奥尼亚带。我们发现，顺时针旋转可能是由于，至少部分地，旋转在逆冲席侵位，与证据的forelandward减少旋转。然而，叠加在这种模式的薄皮旋转，我们观察到后上新世的旋转，影响多个冲断席在一个一致的方式。这些被解释为导致区域构造与，例如，Kefallonia断层带在希腊弧的西部终端和变形之间的过渡带安纳托利亚向西挤压和爱琴海南部的延伸。总的来说，结果是薄皮，向西递减的顺时针旋转模式被叠加的厚皮旋转扭曲，这是东地中海板块运动复杂相互作用的结果。关键词[AQ 1]：_，_，__，_，_ 137 * 电子邮件：l. tailor@ucl.ac.uk。布罗德利湖，Platzman，E.，Platt，J.，Papanikolaou，M.，和马修斯，S.，希腊西北部爱奥尼亚带的古地磁学和构造演化，和Pavlides，S.，编辑，地中海地区和亚洲的后碰撞构造和岩浆活动：美国地质学会特别论文409，第137-155页，doi：10.1130/2006.2409（08）。如需复制许可，请联系editing@geosociety.org。©2006年美国地质学会。All rights reserved.
The Ionian zone is a classic thin-skinned linear fold and thrust belt forming a part of the external Hellenides, in westernmost Greece. The region has been a focus of intensive paleomagnetic investigation since the early 1980s, and it is now generally believed to have undergone a multiphase clockwise vertical-axis rotation of 40°-60° since the Miocene, although the timings are disputed, and spatial variations within this trend have been largely ignored thus far. We present data from thirty new paleomagnetic sites and a reappraisal of previous results from the Ionian zone in an attempt to construct a unified model for the tectonic evolution of the Ionian zone. We find that the clockwise rotations may be due, at least partially, to rotation during thrust sheet emplacement, with evidence of a forelandward decrease in rotation. However, superimposed on this pattern of thin-skinned rotations we observe post-Pliocene rotations that affect multiple thrust sheets in a consistent manner. These are interpreted to result from regional tectonics associated with, for example, the Kefallonia fault zone at the western termination of the Hellenic arc and from deformation in the transition zone between Anatolian westward extrusion and southern Aegean extension. Overall, the result is a pattern of thin-skinned, westward-decreasing clockwise rotations distorted by superimposed thick-skinned rotations resulting from the complex interplay of plate motions in the eastern Mediterranean. Keywords[AQ1]: _________, _________, _________, _________ 137 *E-mail: l.tailor@ucl.ac.uk. Broadley, L., Platzman, E., Platt, J., Papanikolaou, M., and Matthews, S., Paleomagnetism and the tectonic evolution of the Ionian zone, northwestern Greece, in Dilek, Y., and Pavlides, S., eds., Postcollisional tectonics and magmatism in the Mediterranean region and Asia: Geological Society of America Special Paper 409, p. 137–155, doi: 10.1130/2006.2409(08). For permission to copy, contact editing@geosociety.org. ©2006 Geological Society of America. All rights reserved.