دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

تحلیل سیستم ­های دیاژنزی واحدهای کربناته سازند امیران (ماستریشتین بالایی- پالئوسن) بر مبنای مطالعات پتروگرافی و زمین­ شیمی عنصری، زاگرس چین ­خورده، جنوب باختری لرستان

نویسندگان
1 استادیار گروه زمین‌شناسی، دانشکده علوم، مجتمع آموزش عالی گناباد، گناباد، ایران
2 دانشجوی دکترا، گروه زمین‌شناسی، دانشکده علوم، دانشگاه بوعلی‌سینا، همدان، ایران
3 استاد گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه فردوسی مشهد، مشهد، ایران
چکیده
سازند امیران به سن ماستریشتین بالایی پالئوسن در منطقه لرستان، حوضه رسوبی زاگرس گسترش دارد. هدف از این پژوهش بررسی کانی­شناسی اولیه و نوع سیستم­های دیاژنزی واحدهای کربناته سازند امیران در جنوب باختری لرستان بر مبنای زمین­شیمی عنصری و مطالعات سنگ­شناسی می­باشد. به این منظور یک برش چینه­شناسی (برش پیرشمس الدین) اندازه­گیری و نمونه­برداری شد. ضخامت این برش 920 متر و ضخامت بخش کربناته آن 45 متر است. مرز پایینی این سازند با سازند گورپی تدریجی و مرز بالایی آن با سازند کشکان بصورت مشخص است. فرآیندهای دیاژنتیکی مؤثر بر سنگ­های کربناته شامل سیمانی­شدن، نوریختی، فشردگی، سیلیسی­شدن، پیریتی شدن و فابریک ژئوپتال می­باشد. بر اساس مطالعات سنگ­شناسی سنگ­های کربناته، سیمان­های تشکیل­دهنده در برش مورد مطالعه اغلب مربوط به محیط­های دیاژنتیکی دریایی، تدفینی عمیق، تدفینی کم­عمق نزدیک به سطح و به صورت ضعیف دیاژنز جوی هستند. علاوه برآن، اجزای زیستی به مقدار کمی تحت تأثیر انحلال ناشی از دیاژنز متئوریک قرار گرفته­اند. بنابراین سیستم دیاژنزی غالب در توالی مورد بحث یک سیستم دیاژنزی بسته تا نیمه­بسته می­باشد. بالا بودن نسبت عنصر Sr به Mn، مقادیر پایین عناصر Fe و Mn و نسبت بالای عنصر Sr در نمونه­های مورد مطالعه و ترسیم مقادیر Sr/Ca در برابر عنصر Mn بیانگر یک سیستم دیاژنزی بسته برای کربنات­های سازند امیران می­باشد. نتایج آنالیز عنصری نشان­دهنده کانی­شناسی اولیه آراگونیت برای سازند امیران است. همچنین بالا بودن نسبت Sr/Mn و Sr/Na در نمونه­های مورد مطالعه بیانگر یک سیستم دیاژنزی غالب بسته و با تبادل آب به سنگ پایین (W/R) برای کربنات­های سازند امیران می­باشد.
کلیدواژه‌ها

عنوان مقاله English

Analysis of diagenesis systems of carbonate units of Amiran Formation (Upper Maastrichtian-Paleocene) based on petrographic and elemental geochemistry studies, Folded Zagros, south-western Lorestan

نویسندگان English

Y. Nasiri 1
S. Taghdisi Nikbakht 1
M. Sedaghatnia 2
S. R. Moussavi-Harami 3
A. Mahboubi 3
1 Assist. Prof., Dept., of Geology, Faculty of Sciences, University of Gonabad, Gonabad, Iran
2 Ph. D., student, Dept., of Geology, Faculty of Science, Bu Ali Sina University, Hamedan, Iran
3 Prof., Dept., of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
چکیده English

The Amiran Formation with the age of Upper Maastrichtian - Paleocene is spread of in Lorestan region, Zagros sedimentary basin. The purpose of this research is to investigate the primary mineralogy and the type of diagenesis systems of the carbonate units of the Amiran Formation in southwest of Lorestan based on elemental geochemistry and lithological studies. In this regard, a stratigraphic section (Pirshamsoddin section) has been measured and sampled. The thickness of this section is 920 meters, which its carbonate part has a thickness of 45 meters. The lower boundary of this formation is gradual with Gurpi Formation and its upper boundary with Kashkan Formation is sharp. The diagenetic processes affecting carbonate rocks include cementation, crystallization, compaction, silicification, pyritization, and geopetal fabric. Based on lithological studies of carbonate rocks, the cements in this section are often related to marine diagenetic environments, deep burial, and shallow burial close to the surface diagenetic environments, as well as weakly atmospheric diagenesis. Moreover, biological components have been slightly affected by dissolution caused by meteoric diagenesis. Therefore, the dominant diagenesis system in the discussed sequence is a closed or slightly open diagenesis system. The high ratio of Sr/Mn element, low values of Fe and Mn elements and high ratio of Sr element in the studied samples and plotted of Sr/Ca values against Mn element indicate a dominant closed diagenesis system for the carbonates of the Amiran Formation. The elemental analysis results indicate the primary mineralogy of aragonite for the Amiran Formation. In addition the high ratio of Sr/Mn and Sr/Na in the studied samples indicate a dominant closed diagenesis system in a weak and with the few exchange of water-to-rock ratio (W/R) for the carbonates of Amiran Formation.

کلیدواژه‌ها English

Amiran Formation
Zagros basin
Diagenesis processes
Paragenetic sequence
Elemental geochemistry
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  • تاریخ دریافت 18 شهریور 1403
  • تاریخ بازنگری 20 آبان 1403
  • تاریخ پذیرش 28 آبان 1403