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

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