تأثیر فعالیت پهنه گسلی عرضی ایذه بر دگرریختی‌های پوشش رسوبی در زاگرس چین‌خورده-رانده

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمینشناسی، دانشکده علوم پایه، دانشگاه تربیت مدرس، تهران، ایران

چکیده

در این مقالـه هندسـه و تحـول جنبشی سـاختـارهای توسعـه یافته در راستــای یکی از پهنه­های گسلـی عرضی (ایذه) در کمربنــد چین‌خورده- رانده زاگرس ارائه شده تا از این راه منشأ این گسل‌ها و اثر آنها بر ساختارهای کمربند تحلیل شود. دگرریختی­های سطحی بر روی پوشش رسوبی در امتداد پهنه گسلی ایذه شامل تغییر روند ساختارهای اصلی زاگرس و توسعه ساختارهای فرعی به‌صورت ریزچین‌ها و ریزگسل‌ها بر روی ساختارهای اصلی زاگرسی هستند. برداشت‌های دقیق ساختاری از پهنه گسلی نشان داد که نحوه پراکندگی و الگوی این ساختارهای فرعی بر روی پوشش رسوبی در پهنه زاگرس چین­خورده- رانده، به‌گونه­ای است که می­توان سه پهنه فشارشی میان گسل‌های زیرسطحی با آرایش نردبانی را در امتداد پهنه گسلی ایذه تحلیل کرد. با بررسی منحنی­های هم‌ستبرا، تغییرات رخساره­ای سازندهای مختلف و برش‌های لرزه­ای بازتابی مشخص شد که این گسل‌های زیرسطحی مراتب جوان‌تر فعالیت گسل ایذه هستند که به‌عنوان یک گسل پی­سنگی در اثر همگرایی مایل کوهزاد زاگرس، فعالیت دوباره یافته و سبب شکل­گیری چنین دگرریختی‌هایی در پوشش رسوبی شده است. با توجه بهشواهد زمین‌لرزه­ای، اثر این فعالیت تا عهد حاضر نیز ادامه دارد. چنین تحلیلی می­تواند قابل همگانی کردن برای اثر دگرریختی دیگر گسل‌های مایل بر پوشش رسوبی کمربند چین­خورده- رانده زاگرس باشد.
 

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Izeh Transverse Fault Zone Reactivation on the Deformation of Sedimentary Cover in Zagros Fold-Thrust Belt

نویسندگان [English]

  • Z. Davoodi
  • A. Yassaghi
Department of Geology, Faculty of Basic Science, Tarbiat Modares University, Tehran, Iran
چکیده [English]

Geometry and kinematics analyses of structures developed along one of the transverse fault zone (Izeh) in the Zagros fold-thrust belt has been presented to document the origin and to present the effect of this fault zone on the belt structures. Surface deformation of Izeh fault zone on the cover sediments are including changes on the Zagros major structures trends and development of minor structures (such as minor folds and faults) that are overprinted on the belt major structures. Detaeled structural mapping showed the precense of three major restraining zones between the mapped subsurface en-echelon faults along the Izeh fault zone in the Zagros fold-thrust belt. Analysis of isopach maps, facies variation of formations together with interpretation of seismic reflection profiles showed that these subsurfase faults are younger orders of the Izeh fault zone reactivation as a basement fault. Oblique convergence of the Arabian Plate toward the Central Iran is in favor for the reactivation of the fault zone and formation of surface deformations along it. Based on earthquake data this reactivation is continuing until the present time. The result of this study can be used for interpretation of deformation on the sedimentary cover along the similar transvers fault zone in the Zagros fold-thrust belt.

کلیدواژه‌ها [English]

  • Zagros Fold- Thrust Belt
  • Transverse Fault Zone
  • Basement Fault Reactivation
  • Izeh Fault Zone
کتابنگاری
داودی، ز.، 1382- استفاده از رهیافت دورسنجی در شناخت گسل‌های زیرسطحی و سبک دگرریختی‌های آنها در شمال باختری زاگرس. پایان نامه کارشناسی ارشد، دانشگاه تربیت مدرس.
 
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