بررسی تغییرات آلوکم ها و نانوفسیل‌های آهکی در سازند کژدمی: احتمالی بر پیامدهای فعالیت گسلی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه آموزشی معدن، دانشکده فنی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران

2 استادیار، پژوهشگاه استاندارد، پژوهشکده فناوری و مهندسی، گروه پژوهشی ساختمانی و معدنی، کرج، ایران

چکیده

پژوهش حاضر  با هدف بررسی تغییرات محیطی براساس نانوفسیل­های آهکی انجام شده است. بدین منظور برشی از سازند کژدمی در جنوب غرب یاسوج نمونه برداری گردید. در نتیجه مطالعه 60 اسمیراسلاید، 42 گونه متعلق به 21 جنس از نانوفسیل‌های آهکی، از نهشته‌های دریایی شناسایی شدند. با توجه به نانو فسیل­های ثبت شده، سن آلبین برای سازند کژدمی در برش مورد مطالعه تعیین گشت. علاوه بر این، مطالعه مذکور منجر به شناسایی و تمایز زیست‌زون‌های Prediscosphaera columnata  Zone  و Eiffelithus turriseiffelii Zone شد. همچنین در مطالعه حاضر، بررسی چینه­شناسی سنگی، تغییرات سریع سطح دریا را نشان می دهد. از سویی دیگر به نظر می­رسد فعالیت گسل کازرون سبب تغییراتی در شرایط رسوبی و ایجاد رخساره­های مختلف در طول اشکوب آلبین شده است. بنابراین، داده­های فسیلی به همراه مطالعات چینه­نگاری سنگی بیان کننده تغییرات رسوبی از یک سیستم کربناته کم عمق تا رسوبات دریایی عمیق است.

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