تحلیل رخساره‌ها‌ و تفسیر محیطی اثر رخساره‌های گلوسی فانجیتس و کروزیانا در سازند آیتامیر (ناحیه بزنگان حوضه کپه‌داغ، شمال خاوری ایران)

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه فردوسی مشهد

چکیده

سازند آیتامیر (آلبین- سنومانین) از ماسه‌سنگ، شیل، سیلتستون و چندین لایه سنگ­آهک تشکیل شده‌ است. برش­های آرتنج و قرقره در شرق حوضه کپه­داغ برای تفکیک اثر رخساره­ها بررسی شدند. در این تحقیق انواع اثر فـسیل­ها و اثر رخساره­­ها شناسایی شدند و ارتباط آن­ها با محیط رسوبی تفسیر شده است. در برش­های مورد مطالعه اثر فسیل­ها شاملArenicolitesisp. ،Cylinderichnous concentricus،Ophiomorpha isp.،Palaeophycusheberti،Palaeophycustubularis وThalassinoides isp.  است که در اثر رخساره­های گلوسی فانجیتس و کروزیانا واقع شده­اند. اثر رخساره گلوسی فانجیتس با تنوع کم اثرفسیل­ها و جهت­یابی مایل تا عمودی تالاسینوئیدهای Y شکل، پالئوفیکوس و آرنوکولیتس و همراهی با ساخت­های رسوبی طبقه­بندی مورب تراف و طبقه­بندی مورب مسطح در مجموعه سدی با انرژی بالا تشکیل شده است. در حالی­که اثر رخساره کروزیانا با تنوع بیش­تر و اثر فسیل­های عمدتا مایل تا افقی در بستر ماسه­ای با جورشدگی ضعیف تا متوسط در شرایط کم انرژی محیط حاشیه ساحل تشکیل گردیده است.

کلیدواژه‌ها


عنوان مقاله [English]

Facies analysis and environmental interpretation of Glossifunjites and Cruziana ichnofacies of Aitamir Formation (Bazangan Area- East Kopet Dagh, NE Iran)

نویسندگان [English]

  • Raheleh Aghighi
  • Asadollah Mahboubi
  • Reza Moussavi- Harami
  • Mohammad Khaneh Bad
چکیده [English]

The Aitamir Formation (Albian- Cenomanian) consists of sandstone, shale, siltstone and several limestone beds. Artenj and Ghorghoreh sections have studied in east of basin for determination of the ichnofacies. In this research, trace fossils types and ichnofacies are recognized and their relation with depositional environment has interpreted. Trace fossils in studied sections consist of Arenicolitesisp., Cylinderichnous concentricus, Ophiomorpha isp., Palaeophycus heberti, Paleophycus tubularis and Thalassinoidesisp. that can be placed in glossifunjites and Cruziana ichnofacies. Glossifunjites ichnofacies with low diversity of trace fossils and oblique to vertical orientation of the Y branched Thalassinoides, Paleophycus and Arenicolites in trough and planar cross-bedded were formed in high-energy barrier complex. Whereas Cruziana ichnofacies with higher diversity and mainly oblique to horizontal trace fossils in sandy substrate with low to moderate sorting are formed in low energy condition in shoreface environment.

کلیدواژه‌ها [English]

  • Tracefossil
  • Ichnofacies
  • Cruziana
  • Glossifungites
  • Aitamir

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