ریزرخساره ها و مدل رسوب‌گذاری سازند قم در ناحیه خورآباد (جنوب شرقی قم)

نوع مقاله : علمی -پژوهشی

نویسندگان

1 کرمان، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، پژوهشگاه علوم، گروه اکولوژی

2 emohammadi02@gmail.com

چکیده

سازند قم در حوضه­های شمال­غربی-جنوب­شرقی پیش کمان سنندج-سیرجان، درون کمانی ارومیه-دختر و پس کمانی ایران مرکزی نهشته شده است. نهشته­های سازند قم در جنوب­شرقی قم به منظور مطالعه ریزرخساره ها و شرایط حاکم بر رسوب­گذاری آنها مورد مطالعه و نمونه­برداری قرار گرفتند. سازند قم در ناحیه مورد مطالعه 260 متر ضخامت داشته و از نظر سنگ­شناسی عمدتاً شامل سنگ آهک­های متوسط تا ضخیم لایه و توده­ای، آهک­های مارنی، مارن، نهشته­های تبخیری و نهشته­های آواری (کنگلومرا، ماسه­سنگ و سیلتستون) می­باشد. این برش با ناپیوستگی آذرین پی بر روی سنگ­های ولکانیکی ائوسن قرار گرفته و در انتها توسط سازند قرمز بالایی پوشیده شده است. با توجه به پراکندگی فرامینیفرها، سازند قم در ناحیه مورد مطالعه دارای سن روپلین-بوردیگالین می­باشد. مطالعات میکروسکوپی و شواهد صحرایی منجر به شناسایی 11 ریزرخساره (8 ریزرخساره کربناته و 3 رخساره تبخیری، تخریبی و مارنی) در برش خورآباد گردید. براساس ریزرخساره های شناسایی شده و شواهد صحرایی، نهشته­های سازند قم در برش خورآباد بر روی یک رمپ کربناته نهشته شده است. رمپ مذکور بطور کلی قابل تقسیم به دو بخش رمپ داخلی (لاگون) و رمپ میانی (دریای باز) می­باشد و نهشته­های رمپ خارجی که با حضور روزنداران پلانکتون یا ارگانیسم­های مستقل از نور همچون بریوزوثرها و عدم حضور فرمینیفرهای بنتیک همزیست دار مشخص می­گردد، در برش مورد مطالعه مشاهد نشده است.

کلیدواژه‌ها


عنوان مقاله [English]

Microfacies and depositional model of the Qom Formation in the Khurabad area (southeastern Qom)

چکیده [English]

Deposition of the Qom Formation took place in three NW–SE-trending basins: Sanandaj–Sirjan fore-arc basin, Urumieh–Dokhtar intra-arc basin and Central Iran back-arc basin. The Qom Formation deposits in southeastern Qom have been sampled and studied in order to study the microfacies and their depositional conditions. Outcrops of the Qom Formation in the study area, with 260-m thickness, consist mainly of medium to thick bedded and massive limestones, marly limestone, marl, evaporate deposits and siliciclastic deposits (siltstone, sandstone, congelomerate). Study section is unconformably underlain by the Eocene volcanic rocks and overlain by the Upper Red Formation (URF). On the basis of recognized foraminifera and their vertical distribution, the Qom Formation is Rupelian-Burdigalian in age in the study area. Fourteen microfacies were recognized based on field investigations and microscopic studies. Based on recognized microfacies and field investigations and absence of reefal, oolitic and bioclastic barriers, the Qom Formation in southeastern Qom deposited on an open shelf. This shelf, is generally dividable into two depositional environments including inner shlf (lagoon) and middle shelf (open marine). However, outer shelf deposites which is characterized by the presence of planktonic foraminifera and/or light-independent, heterotroph organisms, as well as absence of larger benthic foraminifera are not observed in the study area.

کلیدواژه‌ها [English]

  • Qom Formation
  • Oligo-Miocene
  • Open shelf
  • Depositional model
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