زیست زون‌بندی سازند جیرود در البرز خاوری (منطقه دامغان) براساس بازوپایان

نوع مقاله: مقاله پژوهشی

نویسنده

گروه زمین شناسی، دانشگاه پیام نور، دامغان، ایران

چکیده

سازند جیرود گسترش وسیعی در منطقه دامغان دارد. از نظر سنگ شناختی، این سازند به‌طور عمده از آهک، آهک مارنی، شیل و ماسه سنگ کوارتزیتی تشکیل شده است و ستبرای آن از 10 تا حدود 200 متر تغییر می‌کند. بازوپایان سازند جیرود در جنوب باختر، شمال و شمال خاور منطقه دامغان (برش‌های دروار، سیمه کوه و ده‌ملا) مورد مطالعه قرار گرفتند و گونه‌های زیر در آنها شناسایی شدند:
Schellwienella sp., Mesoplica praelonga, Mesoplica sp., Sentosia sp., Schizophoria impressa, Leptagonia sp., Aulacella interlineata, Zaigunrostrum iranicum, Leptocaryorhynchus jamensis, Araratella dichotomians assimulata, Araratella sp., Centrorhynchus charakensis, Megalopterorhynchus chanakchiensis, Paurogastroderhynchus nalivkini, Paurogastroderhynchus bikniensis, Cleiothyridina coloradensis, Cleiothyridina sp., Athyris tau, Composita cf. globosa,Lamellosathyris sp., Cyrtospirifer sergunkovae, Cyrtospirifer sp.,Cyrtiopsis graciosa chakhaensis, Cyrtiopsis lapparenti, Prospira struniana, Prospira lapparenti, Rigauxia cyrtinaeformis, Rigauxia crassiplicatus, Dichospirifer thylakistoides, Eobrachythyris sp.,Toryniferella echinulata, Cryptonella sp.,
براساس این بازوپایان، سن فامنین پیشین- پسین را می‌توان برای بخش کربناتی سازند جیرود در این برش‌ها در نظر گرفت. همچنین سازند جیرود در این برش‌ها، هم‌ارز قسمت میانی و بالایی (بجز زیست‌زون Rossirhynchus) سازند جیرود در برش الگو (البرز مرکزی) است.
 

کلیدواژه‌ها


عنوان مقاله [English]

Biozonation of Geirud Formation in the Eastern Alborz (Damghan Region) based on the Brachiopoda

نویسنده [English]

  • M. R. Kebria-ee
Department of Geology, Payam-e- Noor University, Damghan ,Iran
چکیده [English]

Geirud Formation has a wide distribution in the Damghan region. The Formation Lithology is mostly composed of limestone, marly limestone, shale and quartizic sandstone and its thickness ranges from 10 - 200 meters. Brachiopoda of Geirud Formation in the southwest, north and northeast of Damghan region (Darvar, Simeh- Kuh and Deh- Molla sections) were studied and resulted in recognizing some species that are as follows:
Schellwienella sp., Mesoplica sp., Sentosia sp., Schizophoria impressa, Leptagonia sp., Aulacella interlineata, Zaigunrostrum iranicum, Leptocaryorhynchus jamensis, Araratella dichotomians assimulata, Araratella sp., Centrorhynchus charakensis, Megalopterorhynchus chanakchiensis, Paurogastroderhynchus nalivkini, Paurogastroderhynchus bikniensis, Cleiothyridina coloradensis, Cleiothyridina sp., Athyris tau, Composita cf. globosa,Lamellosathyris sp., Cyrtospirifer sergunkovae, Cyrtospirifer sp.,Cyrtiopsis graciosa chakhaensis, Cyrtiopsis lapparenti, Prospira struniana, Prospira lapparenti, Rigauxia cyrtinaeformis, Rigauxia crassiplicatus, Dichospirifer thylakistoides, Eobrachythyris sp.,Toryniferella echinulata, Cryptonella sp.
Based on the above mentioned Brachiopoda an age of Early Famennian- Late Famennian can be considered for carbonate part of Geirud Formation in the these sections.
Also, Geirud Formation in the sections is equivalent with middle and upper parts (with the exception of Rossirhynchusbiozone) of Geirud Formation in the type section (Central Alborz). 

کلیدواژه‌ها [English]

  • Brachiopoda
  • Geirud Formation
  • Damghan
  • Eastern Alborz
  • Famennian

کتابنگاری

سعیدی، ع. و اکبرپور، م. ر.، 1371- نقشه زمین‌شناسی کیاسر (مقیاس 100000 :1)،  سازمان زمین‌شناسی کشور، ورقه شماره 6762.

کبریائی‌زاده، م. ر، 1382-  مطالعه بازوپایان سازند جیرود در شمال خاور دامغان (برش ده‌ملا)، بیست و دومین گردهمایی علوم زمین،  ایران- تهران.

کبریائی زاده، م. ر، 1384-  نقش بازوپایان در زیست‌زوناسیون توالی‌های دونین پسین البرز خاوری، طرح پژوهشی، دانشگاه پیام نور.  

علوی نائینی، م.، 1372- چینه شناسی پالئوزوییک، سازمان زمین شناسی ایران.

 

 

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