زیست‌چینه‌نگاری سازند زیارت بر مبنای نانوفسیل‌های آهکی در برش توچال (البرز مرکزی)

نویسندگان

1 دانشیار گروه زمین‌شناسی، دانشگاه پیام‌نور، تهران، ایران

2 دانشیار گروه مهندسی معدن، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران

چکیده

در این مطالعه زیست‌چینه‌نگاری سازند زیارت براساس نانوپلانکتون‌های آهکی در برش توچال (جنوب شرق تهران) بررسی شد. سازند زیارت در این برش در بالای کنگلومرای فجن و در زیر سازند کرج واقع شده است. ضخامت سازند در برش توچال با 4 واحد سنگی، 212 متر بوده و عمدتاً متشکل از سنگ‌آهک و مارن می‌باشد. در این مطالعه، بررسی 105 نمونه آماده شده و نانوپلانکتون‌های آهکی منجر به شناسایی 37 گونه متعلق به 16 جنس شد. بر مبنای اولین و آخرین حضور گونه‌های نانوفسیلی شاخص و مجموعه فسیلی همراه نظیر Tribrachiatus contortus، Discoaster lodoensis، Tribrachiatus orthostylus، Discoaster sublodoensis و Nannotetrina fulgens زیست‌زون‌های NP9 تا  NP15و CNP11 تا CNE9 در سازند زیارت تعیین گردید. زیست‌زون‌های نانوفسیلی و جایگاه چینه­شناسی آن‌ها موید سن پالئوسن پسین تا ائوسن میانی (تانتین تا لوتتین) برای سازند زیارت در برش  توچال است.

کلیدواژه‌ها


عنوان مقاله [English]

Biostratigraphy of the Ziyarat Formation based on calcareous nannofossil in the Tochal section (Central Alborz)

نویسندگان [English]

  • M. Notghi Moghaddam 1
  • S. Senemari 2
1 Assoc. Prof., Dept. of Geology, Payame Noor University, Tehran, Iran
2 Assoc. Prof., of Mining Engineering, Imam Khomeini International University, Qazvin, Iran
چکیده [English]

In this study, biostratigraphy of the the Ziyarat Formation was investigated based on calcareous nanoplankton in the Tochal section (southeast of Tehran). In this section the Ziyarat Formation conformably overlies the Fajan conglomerate and is overlain the Karaj Formation. The thickness of the formation in Tochal section with four rock units is 212 meters and it mainly consists of limestone, and marl. In this study, investigation of 105 prepared samples and calcareous nannoplanktons has led to the identification of 37 species belonging to 16 genera. Based on the first and last occurences of nannofossil species and assemblage species such as Discoaster sublodoensis, Nannotetrina fulgens, Tribrachiatus orthostylus, Discoaster lodoensis and Tribrachiatus contortus the NP9-NP15 and CNP11-CNE9 biozones in the Ziyarat Fsormation were determined. The nannofossil biozones and their stratigraphic location indicate the age of the late Paleocene - middle Eocene (Thanetian- Lutetian) for the Ziyarat Formation in the Tochal section.

کلیدواژه‌ها [English]

  • Biozone
  • Calcareous nannofossils
  • Ziyarat
  • Tochal
  • Alborz
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