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Late Cenozoic shift from extension to strike-slip stress regime in the west of the Biga Peninsula, NW Turkey
Journal of Structural Geology ( IF 2.6 ) Pub Date : 2021-04-28 , DOI: 10.1016/j.jsg.2021.104348
Ömer Feyzi Gürer , Ercan Sanğu , Aysan Gürer , Mert Akın

To the west of the Biga Peninsula, there are Paleozoic-Mesozoic metamorphic massifs and young fault systems that developed in different directions and periods. We investigated the types, formation times, and kinematics of these faults. Our field observations and kinematic studies show that there were three stress phases in the region between the Neogene and Quaternary. According to the analysis, in the first phase during the Miocene-Pliocene, the region was under NW-SE extension which affected western Anatolia. Right-lateral faults with left step-overs developed with the entrance of the North Anatolian Fault System into the Marmara region in the Middle-Late Pleistocene. This system started the second stage in the Late Pleistocene, and a short-lived NNE-SSW compression regime prevailed in the region. As a result, reverse faults and thrusts developed. In the third phase, During the Late Pleistocene-Holocene, the direction of extension turned to the NE-SW as the North Anatolian Fault System affected the region. The data we obtained from the region show that the West Anatolian Extensional System was effective during the Miocene-Pliocene. Then, particularly within the Late Pleistocene-Holocene period, the North Anatolian Fault System played the main role in the morphotectonic development of the Biga Peninsula and its surroundings.



中文翻译:

土耳其西北部Biga半岛西部晚期新生代从扩张到走滑应力状态的转变

在比加半岛西部,有古生代—中生代变质地块和年轻的断层系统,它们在不同的方向和时期发育。我们研究了这些断层的类型,形成时间和运动学。我们的现场观察和运动学研究表明,在新近纪与第四纪之间的区域存在三个应力阶段。根据分析,在中新世-上新世的第一阶段,该区域处于西北-东南扩展,影响了安纳托利亚西部。随着北安那托利亚断层系统进入中晚更新世的马尔马拉地区,出现了具有左阶跃的右侧断层。该系统开始于晚更新世的第二阶段,该地区盛行了短暂的NNE-SSW压缩机制。因此,反向断裂和逆冲发展。在第三阶段,晚更新世-全新世期间,随着北安那托利亚断层系统影响该地区,延伸方向转向NE-SW。我们从该地区获得的数据表明,在中新世—上新世期间,西安纳托利亚伸展系统是有效的。然后,特别是在更新世-全新世晚期,北安那托利亚断层系统在Biga半岛及其周围地区的构造构造发展中起了主要作用。

更新日期:2021-05-03
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