<p>The Albian Burgan Formation was deposited on the southern margin of the Neo-Tethys and the northeastern margin of the Arabian Plate as a result of interactions among different parameters, such as humid climate regimes, the Arabian Shield uplift, and global sea-level fall. This study revealed that the Burgan Formation was subjected to astronomically forced climate and sea-level changes during the Albian. A suite of astronomical cycles was detected by analyzing wireline logs of the Burgan Formation in two wellbores from different oil fields in the northwestern Persian Gulf. The cycles include the 405&#xa0;kyr orbital long eccentricity and its ~ 1.7&#xa0;Myr modulation periodicity, the 100&#xa0;kyr short eccentricity, obliquity, precession, and sub-Milankovitch cycles (e.g., ~ 11&#xa0;kyr and ~ 7&#xa0;kyr). The sedimentation rates of the Burgan Formation in the examined intervals were calculated to be approximately 2.9&#xa0;cm/kyr (29&#xa0;m/Myr) using spectral analysis techniques. The sedimentary noise models of DYNOT were used to link the depositional conditions of the Burgan Formation to the global sequence stratigraphic framework. According to the astrochronological timescale, the Burgan Formation accumulated during a period of about 9.3&#xa0;Myr. Through the utilization of two distinct Fischer plots and sedimentary noise modeling, a total of six third-order sea-level sequences were discerned within the investigated successions. These sequences correspond to ~ 1.7&#xa0;Myr orbital cycles of the Burgan Formation and correlate with the global sequences of the Albian. The match between the global sea-level fluctuations and the Burgan Formation’s ~ 1.7&#xa0;Myr orbital cycles suggests that the long-period orbital cycles were important drivers of the global climate and sea-level changes during the Albian.</p> Graphical abstract <p></p>

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Earth’s orbital control on the Albian sedimentary sequences along the southern Neo-Tethys margin

  • Omid Falahatkhah,
  • Masoumeh Kordi

摘要

The Albian Burgan Formation was deposited on the southern margin of the Neo-Tethys and the northeastern margin of the Arabian Plate as a result of interactions among different parameters, such as humid climate regimes, the Arabian Shield uplift, and global sea-level fall. This study revealed that the Burgan Formation was subjected to astronomically forced climate and sea-level changes during the Albian. A suite of astronomical cycles was detected by analyzing wireline logs of the Burgan Formation in two wellbores from different oil fields in the northwestern Persian Gulf. The cycles include the 405 kyr orbital long eccentricity and its ~ 1.7 Myr modulation periodicity, the 100 kyr short eccentricity, obliquity, precession, and sub-Milankovitch cycles (e.g., ~ 11 kyr and ~ 7 kyr). The sedimentation rates of the Burgan Formation in the examined intervals were calculated to be approximately 2.9 cm/kyr (29 m/Myr) using spectral analysis techniques. The sedimentary noise models of DYNOT were used to link the depositional conditions of the Burgan Formation to the global sequence stratigraphic framework. According to the astrochronological timescale, the Burgan Formation accumulated during a period of about 9.3 Myr. Through the utilization of two distinct Fischer plots and sedimentary noise modeling, a total of six third-order sea-level sequences were discerned within the investigated successions. These sequences correspond to ~ 1.7 Myr orbital cycles of the Burgan Formation and correlate with the global sequences of the Albian. The match between the global sea-level fluctuations and the Burgan Formation’s ~ 1.7 Myr orbital cycles suggests that the long-period orbital cycles were important drivers of the global climate and sea-level changes during the Albian.

Graphical abstract