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
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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