فرگشت ساختاری پی‌سنگ و فعالیت ساختارهای نمکی در ناحیه فیروزآباد فارس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده زمین‌شناسی، پردیس علوم، دانشگاه تهران، ایران

2 دانشکده فنی دانشگاه تهران

3 پژوهشکده علوم زمین، سازمان زمین‌شناسی واکتشافات معدنی کشور، تهران، ایران

چکیده

         منطقه مورد مطالعه در کمربند ساده چین خورده زاگرس در جنوب فیروزآباد فارس قرار دارد. با استفاده از منحنی‌های هم‌ستبرای واحدهای سنگی ناحیه می‌توان فرگشت شکل بستر حوضه رسوبی و زمان آغاز شکل‌گیری ساختارهای چین خورده، ساخت‌های نمکی و گسل‌ها را بررسی کرد. همچنین از این اطلاعات می‌توان برای تعیین چگونگی ایجاد ساختارها استفاده کرد. در این پژوهش، از منحنی‌های هم‌ستبرای رسوبات واحدهای سنگی گوناگون با سن پرمین تا پالئوسن و الیگومیوسن که توسط شرکت ملی نفت ایران تهیه شده، برای رسم الگوهای سه بعدی بستر حوضه استفاده شده است. اگر این الگوهای سه بعدی بر اساس ارزش‌های منحنی‌های هم‌ستبرا با علامت منفی محاسبه شوند، نشا‌ن‌دهنده شکل بستر حوضه رسوبی خواهند بود. با استفاده از این الگوهای سه بعدی، الگویی برای فرگشت حوضه رسوبی، زمان شروع حرکات ساخت‌های نمکی و نحوه عملکرد گسل‌های پی سنگی در ناحیه فیروزآباد پیشنهاد شده است .بر روی گسل پی سنگی منقــــارک، با رونـــد شمالی ـ جنوبی، در زمان پرمین جابه‌جایی قائم روی داده و از تریاس به بعد عملکرد آن به صورت راستالغز چپ‌بر تغییر کرده است. ساخت‌های کششی نیز در خاور گسل منقارک شکل گرفته‌اند و تا کرتاسه میانی فعال بوده‌اند. همزمان با بسته شدن نوتتیس، ساخت‌های کششی به ساخت‌های فشارشی تبدیل شده و عملکرد گسل منقارک نیز به صورت راستالغز راست‌بر تغییر یافته است.  فعالیت ساخت‌های نمکی در راستای پهنه گسل منقارک، مانند دیاپیر کوه جهانی و دیاپیر فیروزآباد، در پرمین فعال بوده و در کرتاسه فعالیت آنها افزایش یافته است.

کلیدواژه‌ها


عنوان مقاله [English]

Structural Evolution of the Basement and Activity of Salt Structures in Firuzabad Area, Fars

نویسندگان [English]

  • M. Pirouz 1
  • A. Bahroudi 2
  • M.R. Ghasemi 3
  • A. Saeidi 3
1 School of Geology, University College of Science, University of Tehran, Tehran, Iran
2 Mining Faculty,Tehran University, Tehran, Iran
3 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
چکیده [English]

        The study area is located in Zagros simply folded belt, south of Firuzabad city. We have considered sedimentary basin floor deformation, initial time of folding and salt structure upwelling by using isopach data. Moreover, these data can be used to indicate the expanding development. We have used NIOC isopach data for the Permian to Paleocene and Oligomiocene. If isopach data values are reversed and the 3D patterns calculated, they can show sedimentary basin floor shape. According to the 3D patterns, sedimentary basin evolution pattern, primary time of salt structures movements and basement faults movement in Firouzabad area were obtained. Mengharak basement fault with N-S trend activated with vertical displacement in the Permian and its movement changed left lateral strike slip after Triassic. In addition, extensional structures formed in the east of Mengharak fault continued to middle Cretaceous. At the same time, Neothetys was closed and the extension structures were converted to compression structures and also Mengharak fault movement changed to right lateral strike slip. Activity of salt structures (Jahani and Firuzabad) began in Permian and its activation increased during the Cretaceous in the Mengharak fault zone.

کلیدواژه‌ها [English]

  • Basement structure
  • Salt structure
  • Firuzabad
  • Simply folded belt
  • Zagros
  • Mengharak fault
  • Sedimentary basin

 

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