بررسی رخساره ای، محیط رسوبی و شرایط پالئواکولوژیکی رمپ کربناته کربنیفر پیشین در حوضه سنندج- سیرجان، ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دکترا، گروه زمین‎شناسی، دانشگاه آزاد اسلامی، واحد تهران شمال، تهران، ایران

2 استادیار، گروه زمین‎شناسی، دانشگاه تحصیلات تکمیلی علوم پایه، زنجان، ایران

3 استادیار، گروه زمین‎شناسی، دانشگاه آزاد اسلامی، واحد تهران شمال، تهران، ایران

4 استادیار، گروه زمین‎شناسی، دانشگاه آزاد اسلامی، واحد اصفهان (خوراسگان)، اصفهان، ایران

5 کارشناسی ارشد، گروه زمین‎شناسی، دانشگاه آزاد اسلامی، واحد اصفهان (خوراسگان)، اصفهان، ایران

10.22071/gsj.2019.88505

چکیده

در این پژوهش توالی­های کربناته تورنزین- ویزین در برش­­­های تنگ دارچاله و بناریزه، در حوضه اصفهان- سیرجان جهت انتخاب مدل رخساره­ای مورد مطالعه قرار گرفته است. بر اساس بررسی­های دقیق رخساره­ای و توالی برانبارش آنها، 4 کمربند رخساره­ای شامل محیط­های حوضه­ای و رمپ بیرونی ( FA1وFA2 : توالی­های رخساره­ای ساب­تایدال عمیق)، رمپ میانی (FA3, FA4, FA6: توالی­های رخساره­ای ساب­تایدال کم‎عمق و اینترتایدال میانی) و رمپ داخلی (FA5: توالی­های سد ماسه­ای) در نهشته­های مذکور شناسایی شده است. تبدیل تدریجی رخساره­ها و دسته‌رخساره­های شناسایی شده به­ه مراه پروفیل رسوبی و الگوی برانبارش طرح­های رسوبی در دسته رخساره­های موجود حاکی از ته­نشینی این رسوبات در پلاتفرم کم‌عمق کربناته رمپ از نوع کم‌زاویه دارد که تحت تأثیر نوسانات امواج و طوفان با الگوی کلی پیشرونده از دسته‌رخساره­های پروکسیمال به دیستال حوضه تبدیل می­شود. این مطالعه پیشنهاد می­کند که در طول کربنیفر پیشین یک پلاتفرم کربناته کم‌عمق گسترده اپی­ریک در حاشیه جنوبی پالئوتتیس گسترش یافته است.

کلیدواژه‌ها


عنوان مقاله [English]

Facies analysis, depositional environments and palaecological conditions of the Lower Carboniferous carbonate ramp in the Sanandaj- Sirjan zone, Iran

نویسندگان [English]

  • F. Shirezade Esfahani 1
  • A. Bayet-Goll 2
  • N. Kohansal Ghadimvand 3
  • A. Kangazian 4
  • A. Akbari Mohammadi 5
  • M. Sadri 5
1 Ph.D., Department of Geology, Islamic Azad University, North Tehran Branch, Tehran, Iran
2 Assistant Professor, Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran
3 Assistant Professor, Department of Geology, Islamic Azad University, North Tehran Branch, Tehran, Iran
4 Assistant Professor, Departmentof Geology, Islamic Azad University, Esfahan (Khorasgan) Branch, Esfahan, Iran
5 M.Sc., Departmentof Geology, Islamic Azad University, Esfahan (Khorasgan) Branch, Esfahan, Iran
چکیده [English]

The carbonate successions (Tournaisian-Visean) exposed in the Tang-e-Darchaleh and Banarizeh sections from Sanandaj-Sirjan Zone (SSZ), Iran, have been used to generate a facies model. From the analysis of facies and their associations, four depositional zones are recognized on the Tournaisian-Visean ramp: basinal environments, outer ramp (FA1 and FA2; deep subtidal associations), mid ramp (FA3, FA4 and FA6; shallow subtidal to lower intetidal associations), and inner ramp (FA5; shoal). The gradual transitions between facies and facies associations, as well as the depositional profile of the shelf transect indicate a low gradient ramp. The observed sedimentary features in the facies associations portray a transgressive, proximal-to-distal, wave-dominated combined flow marine ramp sequence, as recorded in stratigraphic changes in character of storm bed sequences and the spatial arrangement of types of storm bed along the depth related environmental gradients. This study suggests that during the Lower Carboniferous, a broad shelfal platform covered the southern margin of the Palaeotethys, which was characterized by dominantly shallow carbonate ramp.

کلیدواژه‌ها [English]

  • Facies
  • Palaecological conditions
  • Ramp
  • Lower Carboniferous
  • Sanandaj- Sirjan zone

کتابنگاری

شیره‎زاده اصفهانی، ف.، 1394- تکوین حوضه رسوبی کربنیفر در بلوک اصفهان- سیرجان براساس ویژگی­های محیط رسوبی و چینه نگاری سکانسی، رساله دکترا، دانشگاه آزاد واحد تهران شمال، گروه زمین‎شناسی، 245 ص.

نورالدینی، م.، 1387- زیست‎چینه‎نگاری، میکروفاسیس و محیط­های رسوبی نهشته­های کربنیفر در مقطع بناریزه، شمال خاور آباده، پایان‌نامه کارشناسی ارشد،‌ دانشگاه اصفهان، گروه زمین‎شناسی، 120 ص.

نورالدینی، م.، یزدی، م.، عاشوری، ع. و رحمتی، س.، 1394- عناصر اسکلریت هولوتورین­های کربنیفر پیشین در برش بناریزه، جنوب خاوری اصفهان، فصلنامه علوم زمین، سازمان زمین‎شناسی، شماره 95، صص. 165 تا 174.

 

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