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首页> 外文期刊>Marine Geophysical Researches >Tectonic evolution of the northern shelf of the Marmara Sea (Turkey): interpretation of seismic and bathymetric data
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Tectonic evolution of the northern shelf of the Marmara Sea (Turkey): interpretation of seismic and bathymetric data

机译：马尔马拉海（土耳其）北部陆架的构造演化：地震和测深数据的解释

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This study is based on the geological interpretation of 250 km(2) of multibeam bathymetric data coupled with 300 km of seismic profiles recorded on the northern shelf of the Marmara Sea offshore Buyuk double dagger ekmece and KuA A1/4k double dagger ekmece Lagoons. The sea bottom morphology has a highly chaotic structure at the exit of the Buyuk double dagger ekmece and KuA A1/4k double dagger ekmece lagoons. This chaotic surface structure is controlled by a basin-ridge system lying in the NE-SW direction at the exit of the Buyuk double dagger ekmece Lagoon and by a relatively deep entrance observed at the exit of the KuA A1/4k double dagger ekmece Lagoon. In addition, the linear submarine slope parallel to the shoreline between the Istanbul Strait and the KuA A1/4k double dagger ekmece Lagoon is an important morphological structure of this area. The Istanbul Strait's canyon on the northern shelf of the Marmara Sea and the elevated submarine plain west of this canyon are other important morphological structures observed at the sea bottom. The geologic interpretation of seismic profiles has allowed us to distinguish two seismo-stratigraphic units. The lower one is separated from the overlying units by a seismic sequence having a seismic facies from chaotic to parallel and the top represented by a high amplitude seismic reflector. Since these units get close to the sea bottom rising landwards, they are inferred to be the seaward continuation of the Oligocene-Upper Miocene units widely exposed on land. The upper unit, overlying the acoustic basement, whose parallel internal reflections onlap and downlap on the top of the acoustic basement, is interpreted as a Quaternary basin fill. Two groups of faults have been identified on seismic profiles and identified based on their characteristics in the study area. The first group consists of dip-slip faults trending NNE-SSW. These faults border the western slope of the Bosporus and the NNE-SSW trending basins offshore of the Buyuk double dagger ekmece Lagoon. The second group of faults consists of NW-SE oriented strike-slip faults. These faults have created the linearities in the same direction at the sea bottom. As the result of comparison of these NW-SE-faults to the North Anatolian Fault Zone (NAFZ), this group of faults is likely to have a relation with the NAFZ. Therefore, it is considered that the mentioned faults may be reactivated in the region due to the stress created by the NAFZ.
机译：这项研究基于250 km（2）的多波束测深数据的地质解释以及马尔马拉海近岸的布尤克双匕首和库阿A1 / 4k双匕首泻湖记录的300 km地震剖面的300 km地震剖面。布尤克双匕首埃克梅切和KuA A1 / 4k双匕首埃克梅切泻湖的出口处，海底形态具有高度混乱的结构。这种混乱的表面结构由位于Buyuk双匕首埃克梅斯泻湖出口处沿NE-SW方向的盆脊系统控制，以及由KuA A1 / 4k双匕首埃克梅斯泻湖出口处观察到的相对较深的入口控制。此外，与伊斯坦布尔海峡和KuA A1 / 4k双匕首ekmece泻湖之间的海岸线平行的线性海底坡度是该地区的重要形态结构。马尔马拉海北部陆架上的伊斯坦布尔海峡峡谷和该峡谷以西的高架海底平原是在海底观察到的其他重要形态结构。地震剖面的地质解释使我们能够区分两个地震地层单位。下部的与上覆单元通过地震序列相分离，该地震序列具有从混沌到平行的地震相，顶部则由高振幅地震反射器代表。由于这些单元靠近陆上上升的海底，因此可以推断它们是广泛暴露在陆地上的渐新世-上中新世单元向海的延续。上部覆盖声学基底的单元，其内部平行反射在声学基底顶部的上下重叠，被解释为第四纪盆地填充物。在地震剖面上已识别出两组断层，并根据它们在研究区域中的特征进行了识别。第一组包括趋势为NNE-SSW的倾滑断层。这些断层与博斯普鲁斯海峡的西坡和比尤克双匕首埃克梅切泻湖近海的NNE-SSW趋势盆地接壤。第二组故障由面向NW-SE的走滑断层组成。这些断层在海底沿相同方向产生了线性。将这些NW-SE断层与北安纳托利亚断层带（NAFZ）进行比较的结果，这组断层很可能与NAFZ有关。因此，可以认为由于NAFZ产生的应力，上述断层可能在该区域被重新激活。

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