زیست‏چینه‎نگاری داینوفلاژله های ژوراسیک میانی سازند هجدک در کوچکعلی جنوبی، طبس و تطابق آن با دیگر زیست‎زون های پالینومورفی هم ارز

نوع مقاله: مقاله پژوهشی

نویسنده

استادیار، دانشکده زمین‌شناسی، پردیس علوم، دانشگاه تهران، تهران، ایران

چکیده

سازند هجدک گسترش خوبی در محدوده کفه طبس دارد. پالینوفلورای گوناگون و به نسبت حفظ شده­ای در سازند هجدک چاه شماره 210 اکتشافی زغال‌سنگ منطقه کوچکعلی جنوبی در جنوب باختر طبس وجود دارد. این پژوهش بر پایه سیست‌داینوفلاژله­ها صورت گرفت؛ به‌طوری که 12 گونه داینوسیست متعلق به 5 جنس و 2 گونه اکریتارک شناسایی شد. بر پایه اولین و آخرین حضور دیده شده (LOO, FOO) گونه­های شاخص داینوفلاژله، یک زیست‌زون تجمعی به نام Nannoceratopsis triceras-Pareodinia ceratophora Assemblage Zone شناسایی شد. همچنین، یک زیرزیست‎زون Nannoceratopsis gracilis Total Range Subzone در بخش بالایی سازند هجدک تشخیص داده شد. این زیست‌زون­ها قابل تطابق با مناطق مختلف ایران و جهان به­ویژه در نیمکره شمالی هستند. حضور گونه­های گوناگون Nannoceratopsis در این منطقه از کوچکعلی جنوبی نشان‌دهنده مرز ساحل جنوبی دیرینه کفه طبس در خلال آالنین- باژوسین بوده است.

کلیدواژه‌ها


عنوان مقاله [English]

Dinoflagellate palynostratigraphy of middle Jurassic of the Hojedk Formation, Tabas, Central-East Iran and its correlation to other Palynomorph zones in Iran and elsewhere

نویسنده [English]

  • F. Vaez-Javadi
Assistant Professor, School of Geology, College of Science, University of Tehran, Tehran, Iran
چکیده [English]

Hojedk Formation spreads well through the Tabas Block. Diverse and moderately preserved palynofloras occur in the Middle Jurassic sediments of the formation in south Kouchekali, southwest of Tabas, central-east Iran. The present investigation of the Hojedk Formation has revealed a diverse assemblage of dinoflagellate cysts in which 12 species allocated to 5 genera. Two acritachs were also recognized, permitting establishment of  Nannoceratopsis triceras-Pareodinia ceratophora Assemblage zone, and Nannoceratopsis gracilis Total Rane Subzone in the upper part, lower and upper boundaries have been identified by the first and last observed occurrence (LOO) of these index species. These biozones are comparable to the other palynozones in Iran and elsewhere especially in the northern hemisphere (Greenland, Norway, Scotland, England, and Poland). Occurrence of various species of Nannoceratopsis is concluded that this locality was located at the south palaeocoastal line of the Tabas Block during the Aalenian-Bajocian.

کلیدواژه‌ها [English]

  • Dinoflagellate cysts
  • Middle Jurassic
  • Biostratigraphy
  • Hojedk Formation
  • Tabas

کتابنگاری

آقانباتی، س. ع. و حقی‎پور، ع.، 1353- نقشه 1:250000 زمین‌شناسی طبس، شماره 17، سازمان زمین‌شناسی و  اکتشافات معدنی کشور ایران، تهران.

آقانباتی، س. ع.، 1377- چینه شناسی ژوراسیک ایران، جلد اول: انتشارات سازمان زمین‌شناسی و اکتشافات معدنی کشور ایران، تهران، 355 ص.

آقانباتی، س. ع.، 1393- فرهنگ چینه‌شناسی ایران، جلد چهارم، ژوراسیک، سازمان زمین‌شناسی و اکتشافات معدنی کشور ایران، تهران، 544 ص.

خدام‌الحسینی، س. ر.، 1377- گزارش عملیات پی جویی مقدماتی منطقه کوچکعلی شمالی. طرح اکتشاف زغالسنگ حرارتی ناحیه مزینو، طبس. صص. 33 تا 34 (گزارش داخلی).

واعظ جوادی، ف. و قویدل سیوکی، م.، 1384- مطالعه سیستماتیک گرده و هاگ (spore and pollen) سازند شمشک در منطقه جاجرم. فصلنامه علوم زمین، شماره 65، صص. 94 تا 123.

واعظ جوادی، ف.، قویدل سیوکی، م. و قاسمی‌نژاد، ا.، 1382- بیوستراتیگرافی سازند شمشک کوه ازون، جاجرم بر مبنای داینوفلاژله‎ها، مجله علوم دانشگاه تهران، جلد 29، شماره 1، صص. 141 تا 160.

 

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