دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

تفسیر محیط رسوب­گذاری و تاریخچه تدفین نهشته ­های کربناته سازند آسماری در برش تاقدیس خرم­ آباد، شمال لرستان

نویسندگان
1 استادیار گروه زمین‌شناسی، دانشکده علوم، دانشگاه لرستان، خرم‌آباد، ایران
2 استاد گروه زمین‌شناسی، دانشکده علوم، دانشگاه لرستان، خرم‌آباد، ایران
3 دانش‌آموخته مقطع دکترا، کارشناس آزمایشگاه مرکزی دانشگاه لرستان، خرم‌آباد، ایران
چکیده
در این مطالعه ریزرخساره­ها، محیط رسوب­گذاری و تاریخچه تدفین نهشته­های کربناته سازند آسماری در برش تاقدیس خرم­آباد بررسی شده است. این برش چینه­شناسی با ستبرای 115 متر از نظر سنگ­شناسی شامل سنگ­آهک­های نازک­­لایه، متوسط­لایه و ضخیم­لایه می­باشد که در یال شمالی تاقدیس خرم­آباد (منطقه زرین­چقا) واقع شده است. مرز زیرین و زبرین سازند آسماری در منطقه مورد مطالعه به ترتیب با سازندهای شهبازان و گچساران به صورت ناگهانی و ناپیوستگی فرسایشی است. مطالعات سنگ­شناسی بر روی 115 نمونه مقاطع نازک رسوبی از این سازند و مطالعات صحرایی در نهایت منجر به شناسایی هشت ریزرخساره گردید. این ریزرخساره­ها شامل مادستون فسیل­دار، مادستون دولومیتی شده اینتراکلستی، مادستون فنسترال، وکستون تا پکستون اینتراکلستی- پلوییدی، وکستون بایوکلستی، پکستون بایوکلستی، گرینستون پلوییدی و گرینستون بایوکلستی می­باشند. وجود شواهدی نظیر مادستون فنسترال، فراوانی روزن­داران بنتیک بدون­ منفذ با پوسته پورسلانوز در بافت گل­پشتیبان، فراوانی جلبک­های قرمز، دانه­های کوارتز تخریبی در اندازه سیلت و جورشدگی ضعیف تا متوسط رسوبات، در نهایت این ریزرخساره­ها در سه کمربند رخساره­ای جزرومدی، لاگون و سد یک رمپ داخلی نهشته شده­اند. فرآیندهای دیاژنزی غالب در این ریزرخساره­ها شامل میکریتی شدن، نوریختی افزایشی و کاهشی، سیمانی­شدن (سیمان هم­ضخامت فیبری، هم­بعد، بلوکی، دروزی و فراگیرنده و دولومیتی)، فشردگی فیزیکی و شیمیایی، انحلال وابسته به فابریک و غیروابسته به فابریک سنگ و ایجاد تخلخل­های بین دانه­ای، درون­دانه­ای، حفره­ای، شکستگی، استیلولیتی و قالبی و جانشینی به صورت پیریتی­شدن و سیلیسی­شدن می­باشند. این فرآیندها در چهار محیط دریایی، آب شیرین، تدفینی و بالاآمدگی رخ داده است که در آن­ها سه مرحله دیاژنزی اولیه، میانی و نهایی تفسیر شده است.
کلیدواژه‌ها

عنوان مقاله English

Interpretation of the depositional environment and burial history of carbonate deposits of the Asmari Formation in the Khorramabad anticline section, northern Lorestan

نویسندگان English

S.M.R. Emami 1
I. Maghfori Moghadam 2
M. Sedaghat Nia 3
1 Assist. Prof., Dept., of Geology, Faculty of Science, Lorestan University, Khorramabad, Iran
2 Prof., Dept., of Geology, Faculty of Science, Lorestan University, Khorramabad, Iran
3 Ph. D. Graduate, Expert, Central Laboratory of Lorestan University, Khorramabad, Iran
چکیده English

In this study, the microfacies, depositional environment, and burial history of carbonate deposits of the Asmari Formation in the Khorramabad anticline have been investigated. This 115-meter-thick with lithological thin bedded, medium bedded and thick bedded limestones is located on the northern flank of the Khorramabad anticline (Zarrinchogha region). In this section, the lower and upper boundaries of the Asmari Formation are paraconformity and erosional unconformity with the Shahbazan and Gachsaran formations, respectively. Microscopic studies on 115 thin-section samples and field studies ultimately led to the identification of eight microfacies. These microfacies include fossiliferous mudstone, intraclastic dolomitized mudstone, and fenestral mudstone, wackestone to packstone pelloidal, bioclastic wackestone, packstone bioclastic, grainstone pelloidal, and bioclastic grainstone. Evidence such as fenestral mudstone, abundance of non-porous benthic foraminifera with porcelains shells in the mudstone texture, abundance of red algae, silt-sized detrital quartz grains, and weak to moderate sediment sorting indicate that these microfacies were deposited in three intertidal, lagoon, and barrier facies belts of an internal ramp. The dominant diagenetic processes in these microfacies include micritization, increasing and decreasing neomorphism, cementation (rim cement isopachous, blocky, drusy, and poikilotopic cement), physical and chemical compaction, fabric-dependent and non-fabric-dependent dissolution of the rock, and the creation of intergranular, intragranular, and pore porosity, fracture, stylolitic, and moldic, and replacement in the form of pyritization, silicification, and dolomitization. These processes have occurred in four environments: marine, freshwater, burial, and upwelling, in which three stages of initial, intermediate, and final diagenesis have been identified.

کلیدواژه‌ها English

Depositional environment
Diagenesis
Asmari Formation
Folded Zagros
Lorestan
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  • تاریخ دریافت 22 مرداد 1403
  • تاریخ بازنگری 25 آبان 1404
  • تاریخ پذیرش 09 آذر 1404