زیست‌چینه‌نگاری نانوفسیل‌های آهکی بخش مارنی سازند فرخی در برش چینه‌شناسی فرخی (ایران مرکزی، غرب طبس)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مدیر گروه علوم پایه دانشگاه پیام نور مرکز بیرجند

2 دانشگاه بیرجند - دانشکده علوم- گروه زمین شناسی

3 استاد مدعو دانشگاه آزاد شیراز

چکیده

در مطالعه حاضر زیست‌چینه‌نگاری بخش مارنی سازند فرخی در حوضه رسوبی ایران مرکزی و در برش چینه‌شناسی روستای فرخی براساس نانوفسیل‌های آهکی مورد بررسی قرار گرفته است. سازند فرخی در برش مورد مطالعه عمدتاً شامل سنگ‌آهک، مارن و سنگ‌آهک مارنی می‏باشد. ضخامت بخش مارنی سازند فرخی در برش مورد مطالعه 118 متر بوده و مجموعاً 64 نمونه از این بخش برداشت و بررسی شده است. مطالعه نانوفسیل‌های آهکی در محدوده مورد مطالعه منجر به شناسایی 35 گونه متعلق به 22 جنس شد. برمبنای جنس و گونه‌های شاخص شناسایی‌شده، زیست‌‌زون‌های ‌CC22 تا CC25 از زون‌بندی سیسینگ تعیین شد. بر این اساس سن بخش مارنی سازند فرخی در برش مورد مطالعه کامپانین پسین تا ابتدای ماستریشتین پسین پیشنهاد می‌شود. بررسی‌های دیرینه‌بوم‌شناسی نشان می‌دهدکه ناحیه مورد مطالعه در عرض‌های جغرافیایی نسبتاً پایین نهشته شده و دارای آب گرم با مواد غذایی پایین و باروری پایین است.

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