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<p>Seismo-acoustic and stratigraphic framework of the North İmralı Basin in the Eastern Marmara Sea has been investigated using high-resolution seismic reflection data, in order to reconstruct the evolution of the basin over the past 500&#xa0;ka. Seismic data indicate that the right-lateral strike-slip İmralı Fault, which bounds the basin to the south, is the primary structural feature controlling the formation and development of the basin. The fault bends offshore of the Armutlu Peninsula and north of İmralı Island which induces a NE-SW oriented extensional regime within the basin. As a result, NW–SE trending normal faults with a right-lateral slip component have formed in the north operating as growth faults, demonstrating that the basin is actively subsiding with a counterclockwise rotational motion. Under this subsidence regime, the North İmralı Basin has developed over a negative flower structure associated with a releasing segment mechanism. Vertical displacement measurements along these faults suggest that the subsidence has persisted in a steady-state manner at a constant rate of approx. 60&#xa0;cm/ka over the past 500,000&#xa0;years. The four buried deltas observed in the seismic data were formed during marine regression and represent glacial-stage deltas, excluding Delta-2 which appears to be associated with sea-level rise. No delta has been observed in the past 74&#xa0;ka due to an imbalance between sedimentation rates and the increasing accommodation space.</p> Graphical abstract <p></p>

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Tectonostratigraphy of the North İmralı Basin, Eastern Marmara Sea

  • 期刊论文

  • 发表日期：

    2025年10月11日

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  • Başak Turguz,
  • Derman Dondurur,
  • Aslıhan Nasıf,
  • Orhan Atgın,
  • Özkan Özel

摘要

Seismo-acoustic and stratigraphic framework of the North İmralı Basin in the Eastern Marmara Sea has been investigated using high-resolution seismic reflection data, in order to reconstruct the evolution of the basin over the past 500 ka. Seismic data indicate that the right-lateral strike-slip İmralı Fault, which bounds the basin to the south, is the primary structural feature controlling the formation and development of the basin. The fault bends offshore of the Armutlu Peninsula and north of İmralı Island which induces a NE-SW oriented extensional regime within the basin. As a result, NW–SE trending normal faults with a right-lateral slip component have formed in the north operating as growth faults, demonstrating that the basin is actively subsiding with a counterclockwise rotational motion. Under this subsidence regime, the North İmralı Basin has developed over a negative flower structure associated with a releasing segment mechanism. Vertical displacement measurements along these faults suggest that the subsidence has persisted in a steady-state manner at a constant rate of approx. 60 cm/ka over the past 500,000 years. The four buried deltas observed in the seismic data were formed during marine regression and represent glacial-stage deltas, excluding Delta-2 which appears to be associated with sea-level rise. No delta has been observed in the past 74 ka due to an imbalance between sedimentation rates and the increasing accommodation space.

Graphical abstract