تاریخچه تکامل دگرریختی در پیشانی بلندای قدیمی فارس، جنوب خاور کمربند چین‌خورده و رانده زاگرس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشگاه تحصیلات تکمیلی علوم پایه زنجان

2 2استادیار، دانشکده علوم زمین، دانشگاه تحصیلات تکمیلی علوم پایه، زنجان، ایران

3 استادیار، دانشکده علوم زمین، دانشگاه تحصیلات تکمیلی علوم پایه، زنجان، ایران

4 کارشناسی ارشد، شرکت نفت مناطق مرکزی ایران، تهران، ایران

چکیده

این مطالعه با تلفیق تفسیر خطوط لرزه‌ای دوبعدی، اطلاعات چاه‌های اکتشافی و اطلاعات میدانی به بررسی چگونگی تکامل ساختارها و زمانبندی رویدادهای دگرریختی در پیشانی پهنه بلندای قدیمی فارس، در جنوب خاور کمربند چین‌خورده و رانده زاگرس پرداخته است. در این مقاله با بازگردانی گام به گام برش‌های زمین‌شناسی منطقه‌ای بر اساس الگوی چینه‌های رشدی در نهشته‌های همزمان با زمین‌ساخت و همچنین پایستگی طول و مساحت واحدها، یک مدل تکاملی برای شکل‌گیری ساختارهای پیشانی بلندای فارس ارائه می‌شود. بر اساس این مدل تکاملی، در ائوسن پایانی تاقدیس تابناک با دگرریختی خارج از نوبت در فرادیواره گسل وارون شده پیشانی کوهستان شروع به شکل‌گیری می‌کند. اگر چه در میوسن آغازین چین‌خوردگی جدایشی نازک‌ پوسته در منطقه آغاز می‌شود، اما در زمان میوسن پسین است که آهنگ کوتاه‌شدگی و فرازگیری ساختارها به شدت افزایش می‌یابد، گسلش در پهلوی چین‌ها شکل می‌گیرد و افق جدایش میانی تبخیری‌های دشتک با ستبرشدگی در هسته تاقدیس‌ها درگیر می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Frontal Fars Paleo-High evolution history, SE Zagros fold-and-thrust belt

نویسندگان [English]

  • Ali Taghavy 1
  • Mahdi Najafi 2
  • Najmeh Etemad-Saeed 3
  • Mohammad Seddigh 4
1 M.Sc., Department of Earth Sciences, Institute for Advanced Studies in Basic Science (IASBS), Zanjan, Iran
2 Assistant Professor, Department of Earth Sciences, Institute for Advanced Studies in Basic Science (IASBS) , Zanjan, Iran
3 Assistant Professor, Department of Earth Sciences, Institute for Advanced Studies in Basic Science (IASBS) , Zanjan, Iran
4 M.Sc., Iranian Central Oil Fields Company (ICOFC), Tehran, Iran
چکیده [English]

A synthesis of 2-D seismic interpretation, exploration well data and field survey permit us to decipher the structural evolution history in the front of Fars paleo-high area, located in SE Zagros fold-and-thrust belt. In the current study, a structural evolution model is proposed for the region, according to a sequential restoration, which was performed based on the growth stratal unit’s pattern, together with constant length and area assumptions. The result of the sequential restoration indicated that in the late Eocene time, Tanbak anticline incepted on the hangingwall of the inverted mountain front basement fault, as an out of sequence forced fold. Although, thin-skinned detachment folding initiated in the lower Miocene, shortening and amplification of anticlines did not accelarated until the late Miocene time, when thrust faults formed on the limb of growing anticlines while Dashtak middle detachment thickened in the fold crestal areas, likely due to an intensified regional shortening.

کلیدواژه‌ها [English]

  • Zagros fold and thrust belt
  • Frontal Fars
  • sequential restoration
  • growth strata
  • and deformation rate

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