نانوستراتیگرافی سازندهای سرچشمه و سنگانه در باختر منطقه کپه‌داغ (برش تکل‌کوه)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم‌زمین، دانشگاه شهید بهشتی، تهران، ایران. گروه زمین شناسی، دانشکده علوم، دانشگاه شهید باهنر، کرمان، ایران

2 گروه زمین‌شناسی، دانشکده علوم‌زمین، دانشگاه شهید بهشتی، تهران، ایران.

3 گروه زمین‌شناسی، دانشکده علوم، دانشگاه بیرجند، بیرجند، ایران.

چکیده

در این مطالعه توالی رسوبات کرتاسه زیرین شامل سازندهای سرچشمه و سنگانه در باختر منطقه کپه‌داغ (برش تکل‌کوه) از نقطه نظر نانوفسیل‌های آهکی مورد بررسی قرار گرفت. در برش مورد مطالعه ستبرای این دو سازند 1668 متر است. بر اساس زیست‌زون‌بندی نانوفسیل‌های آهکی، زون‌های نانوفسیلی NC5، NC6 و NC7 تعیین شده است. بر همین اساس سن سازند سرچشمه بارمین پسین- آپتین پیشین و سن سازند سنگانه انتهای آپتین پیشین- ابتدای آپتین پسین است. اجتماع نانوفسیل‌های آهکی موجود در این دو سازند شامل انواعی است که شاخص حوزه تتیس هستند. همچنین در اجتماع نانوفسیل‌های آهکی، انواع شاخص آب‌های سرد از قبیل Repagulum parvidentatum و .Seribiscutum sp. نادر بوده، درحالی‌که انواع شاخص آب‌های گرم از قبیل .Rhagodiscus spp و .Nannoconus spp در منطقه به طور چیره حضور دارند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Nannostratigraphy of Sarcheshmeh and Sanganeh Formations, West of Kopet Dagh Basin (Takal Kuh Section)

نویسندگان [English]

  • A. Mahanipour 1
  • A. Kani 2
  • M. H. Adabi 2
  • S. N. Raisossadat 3
1 Geology Department, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran. Geology Department, Faculty of Sciences, Shahid Bahonar University, Kerman, Iran
2 Geology Department, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran.
3 Geology Department, Faculty of Sciences, Birjand University, Birjand, Iran
چکیده [English]

The Lower Cretaceous sedimentary succession of western Kopet Dagh Basin (Sarcheshmeh and Sanganeh formations) was investigated. Taking into account the considerable thickness of the studied section (1668 m) and the possibility of recording all the important events, determination of calcareous nannofossil biostratigraphy was put on the agenda. This resulted in recognition of NC5, NC6 and NC7A nannofossil zones. Accordingly the age of the Sarcheshmeh Formation within the studied section is determined as Late Barremian- Early Aptian while the age of the Sanganeh Formation is late Early Aptian- early Late Aptian.  The calcareous nannofossil assemblage of Sarcheshmeh and Sanganeh Formations has a Tethyan affinity with abundant warm-water varieties such as Rhagodiscus spp. and Nannoconus spp. while the cold-water species like Repagulumparvidentatum and Seribiscutum spp. are rare.

کلیدواژه‌ها [English]

  • Kopet Dagh
  • Sarcheshmeh Formation
  • Sanganeh Formation
  • Calcareous Nannofossils
  • Late Barremian- Aptian
کتاب‌نگاری

افشار‌حرب، ع.، 1373- زمین‌شناسی ایران، زمین‌شناسی کپه‌داغ. سازمان زمین‌شناسی کشور. 275 صفحه.

دهقان، ف.، 1381- بایواستراتیگرافی سازند سرچشمه بر اساس نانوپلانکتون‌های آهکی در مقطع تیپ (کپه‌داغ مرکزی)؛ پایان‌نامه کارشناسی ارشد دانشگاه شهید بهشتی، 131 صفحه.

شکری، م. ح.، 1379- بایواستراتیگرافی سازند سرچشمه بر مبنای نانوپلانکتون‌های آهکی (65 کیلومتری شمال‌شرق مشهد) در مقطع تیپ. رساله کارشناسی ارشد دانشگاه فردوسی مشهد.

هادوی، ف. و شکری، م.، 1385- بایواستراتیگرافی سازند سرچشمه بر مبنای نانوپلانکتون‌های آهکی در برش آتشگان و امیرآباد (رشته کوه کپه‌داغ)؛ دهمین همایش انجمن زمین‌شناسی ایران، دانشگاه تربیت مدرس، صفحه 219.

هادوی، ف. و بداقی، ف.، 1385- بایواستراتیگرافی سازند سنگانه بر مبنای نانوپلانکتون‌های آهکی در مقطع امیرآباد و مزدوران؛ دهمین همایش انجمن زمین‌شناسی ایران، دانشگاه تربیت مدرس، صفحه 206.

 

 

 

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