تاریخچه رسوبگذاری، دیاژنز و زمین‌شیمی سازند تله-زنگ،جنوب لرستان

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران

چکیده

توالی کربناتی سازند تله­زنگ به سن ائوسن پیشین- میانی عمدتاً از روزن‌داران کف‌زی بزرگ (مانند نومولیت و آلوئولینا) به همراه ذرات اسکلتی و غیر اسکلتی دیگر تشکیل شده است. در این سازند بر مبنای فراوانی و توزیع روزن‌داران و دیگر اجزای موجـــود در رخــساره­های مخــتلـــف، ژرفای حوضه رسوبی و در نتیجه نوع زیر محـیط حوضه رسوبی دیرینه
 (sub-paleoenvironment) تعیین شده است. بررسی رخساره­ها منجر به شناسایی 10 رخساره میکروسکوپی وابسته به 4 کمربند رخساره­ای پهنه کشندی، لاگون، پشته­های سدی و دریای باز شده است. نبود رسوبات دوباره نهشته شده و رخساره­های ریفی، تغییرات تدریجی رخساره­ها و نیز گسترش وسیع پهنه­های کشندی نشان می­دهد که نهشته­های کربناتی سازند تله­زنگ به احتمال قوی در یک سکوی کربناتی از نوع رمپ نهشته شده­ است. با توجه به فراوانی و تنوع بالای روزن‌داران کف‌زی بزرگ در سازند تله­زنگ می­توان برای این نهشته­ها از اصطلاح سیستم رمپ کربناتی حاوی روزن‌داران  فراوان استفاده کرد. مقایسه زمین‌شیمی عنصری و ایزوتوپی بین اجزاء زیستی (روزن‌داران کف‌زی) و اجزاء نازیستی (میکرایت) در کربنات‌های سازند تله­زنگ حاکی از شرایط نزدیک تعادلی، تأثیر کم‌تفریق زیست‌شناختی و اثرات جنبشی مانند سرعت رشد و یا عوامل ناشناخته دیگر  است، و به همین دلیل مقدار دمای محاسبه شده آب دریا بر اساس سنگین­ترین ایزوتوپ اکسیژن در کربنات‌های زیستی با دمای اندازه­گیری شده نمونه­های نازیستی (میکرایت) تقریباً مشابه است. مطالعات
 سنگ‌نگاری و زمین‌شیمیایی نشان می­دهد که نهشته­های کربناتی سازند تله­زنگ تحت‌تأثیر دیاژنز ضعیف جوی در یک محیط دیاژنزی بسته همراه با نسبت پایین تبادلات آب به سنگ (water/rock interaction) قرار گرفته­اند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Depositional History, Diagenesis and Geochemistry of the Tale-Zang Formation, South of Lurestan

نویسندگان [English]

  • A. Zohdi
  • M. H. Adabi
Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Carbonate sequences of the Taleh-Zang Formation mainly consist of large benthic foraminifera (e.g., Nummulites and Alveolina) along with other skeletal and non-skeletal components. In this formation, the water depth during deposition was determined based on the variation and different types of benthic foraminifera and other components in different facies. Microfacies analysis led to the recognition of 10 microfacies that are related to 4 facies belts such as: tidal flat, lagoon, shoal and open marine.The absence of turbidite deposits, reefal facies, gradual facies changes and widespread tidal flat deposits indicate that the Taleh-Zang Formation was deposited in a carbonate ramp environment. Due to the great diversity and abundance of larger benthic foraminifera, this carbonate ramp is referred to as "foram-dominated carbonate ramp system". Comparison between elemental and isotopic compositions of biotic (benthic foraminifera) and abiotic (micrite) components in Taleh-Zang Formation shows an equilibrium condition due to minor biological fractionation and kinetic effects such as growth rate or other unknown factors. Thus, palaeotemperature calculation of seawater based on heaviest oxygen isotope values of biotic and abiotic carbonates are similar. Petrographic and geochemical studies illustrate that these carbonates were affected by weak meteoric digenesis in a closed diagenetic system with a low water/rock interaction.

کلیدواژه‌ها [English]

  • Taleh-Zang Formation
  • Large benthic Foraminifera
  • Carbonate platform
  • Geochemistry
  • Biotic and abiotic components

کتابنگاری

آدابی، م. ح.، 1383- ژئوشیمی رسوبی، انتشارات آرین زمین، 448 صفحه

آقانباتی، س. ع.، 1383- زمین­شناسی ایران، سازمان زمین­شناسی و اکتشافات معدنی کشور، 586 صفحه

زهدی، ا.، آدابی، م، ح.، موسوی، م، ر.، امیری بختیار، ح.، غبیشاوی، ع.، صالحی، م. ع.، 1386- کاربرد روزن‌دارانی بنتیک بزرگ در بازسازی محیط رسوبی سازند تله­زنگ در برش نمونه و برش سطحی کیالو (جنوب لرستان)، اولین همایش دیرینه شناسی ایران، صفحه 111- 106

مطیعی، ه.، 1372- زمین شناسی ایران، چینه شناسی زاگرس، انتشارات سازمان زمین شناسی کشور، 536 صفحه

یزدی مقدم، م.، 1374- بیواستراتیگرافی سازندهای امیران و تله­زنگ در حوضه لرستان، پایان نامه کارشناسی ارشد، دانشگاه فردوسی مشهد، 132 صفحه

 

 

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