A Miocene tectonic inversion in the Ionian Sea (central Mediterranean): Evidence from multichannel seismic data
A Miocene tectonic inversion in the Ionian Sea (central Mediterranean): Evidence from multichannel seismic data
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DOI：
10.1029/2011jb008505
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发表时间：
2011-12-23
影响因子：
3.9
通讯作者：
Klaeschen, Dirk
中科院分区：
文献类型：
--
作者：
Gallais, Flora;Gutscher, Marc-Andre;Klaeschen, Dirk
人们普遍认为地中海中部和东部是新特提斯的遗迹。然而，这一领域的方向和传播的时间仍然存在争议。在这里，我们提出的时间偏移和叠前深度偏移NW-SE方向的阿基米德（1997）线与PrisMed 01（1993）剖面约束的爱奥尼亚盆地的演化。我们的解释使我们能够确定一个大规模的西南-东北走向逆断层下的爱奥尼亚深海平原。这些主要为NW向的断层具有10至20公里的特征间距，倾角范围为60至65度。根据最近的古地理重建，我们建议，一套N度55功能最初形成的正断层在西北-东南走向的爱奥尼亚盆地的海底扩张后，晚三叠世-早侏罗世裂谷。根据几何比较与板内变形下观察到的中印度洋，我们表明，继承的海洋正断层恢复压缩下的逆断层。发育良好的托托期同构造盆地发育在主要断裂的西北部，而麦西尼期花岗岩（移动的单元）的基底因断裂的活动而轻微褶皱。我们发现，3-4公里的总缩短发生在80公里宽的区域下面的爱奥尼亚深海平原，导致体积缩短3.5- 5%。我们提出了一个链接之间的Tortonian-early Messinian反转的故障模式和板块构造重组之前的主要阶段弧后开放的第勒尼安域。
It is widely accepted that the Central and Eastern Mediterranean are remnants of the Neo-Tethys. However, the orientation and timing of spreading of this domain remain controversial. Here, we present time migrated and pre-stack depth migrated NW-SE oriented Archimede (1997) lines together with the PrisMed01 (1993) profile to constrain the evolution of the Ionian basin. Our interpretation allows us to identify a large-scale set of SW-NE striking reverse faults beneath the Ionian Abyssal Plain. These primarily NW vergent faults have a characteristic spacing of 10 to 20 km and a dip ranging from 60 to 65 degrees. Following very recent paleogeographic reconstructions, we propose that the set of N degrees 55 features initially formed as normal faults during NW-SE trending seafloor spreading of the Ionian basin after its late Triassic-early Jurassic rifting. Based on geometric comparisons with the intraplate deformation observed beneath the Central Indian Ocean, we show that the inherited oceanic normal faults were reactivated under compression as reverse faults. Well-developed Tortonian syntectonic basins developed NW of the major faults and the base of the Messinian evaporites (Mobile Unit) is slightly folded by the activity of the faults. We show that 3-4 km of total shortening occurs over a 80 km wide area beneath the Ionian Abyssal Plain, resulting in a bulk shortening of 3.5-5%. We propose a link between the Tortonian-early Messinian inversion of the fault pattern and a plate tectonic reorganization prior to the main phase of back-arc opening of the Tyrrhenian domain.