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ريزرخساره ها و مدل رسوب‌گذاري سازند قم در ناحیه خورآباد (جنوب شرقی قم)
ابراهیم محمدی, حامد عامری

چکیده

سازند قم در حوضه­های شمال­غربی-جنوب­شرقی پیش کمان سنندج-سیرجان، درون کمانی ارومیه-دختر و پس کمانی ایران مرکزی نهشته شده است. نهشته­های سازند قم در جنوب­شرقی قم به منظور مطالعه ریزرخساره ها و شرایط حاکم بر رسوب­گذاری آنها مورد مطالعه و نمونه­برداری قرار گرفتند. سازند قم در ناحيه مورد مطالعه 260 متر ضخامت داشته و از نظر سنگ­شناسي عمدتاً شامل سنگ آهک­هاي متوسط تا ضخيم لايه و توده­اي، آهک­هاي مارني، مارن، نهشته­هاي تبخيري و نهشته­های آواری (کنگلومرا، ماسه­سنگ و سيلتستون) می­باشد. اين برش با ناپيوستگي آذرین پی بر روي سنگ­هاي ولکانيکي ائوسن قرار گرفته و در انتها توسط سازند قرمز بالايي پوشيده شده است. با توجه به پراکندگی فرامینیفرها، سازند قم در ناحیه مورد مطالعه دارای سن روپلین-بوردیگالین می­باشد. مطالعات میکروسکوپی و شواهد صحرایی منجر به شناسایی 11 ریزرخساره (8 ریزرخساره کربناته و 3 رخساره تبخیری، تخریبی و مارنی) در برش خورآباد گردید. براساس ریزرخساره های شناسایی شده و شواهد صحرایی، نهشته­های سازند قم در برش خورآباد بر روی یک رمپ کربناته نهشته شده است. رمپ مذکور بطور کلی قابل تقسیم به دو بخش رمپ داخلی (لاگون) و رمپ میانی (دریای باز) می­باشد و نهشته­های رمپ خارجی که با حضور روزنداران پلانکتون یا ارگانیسم­های مستقل از نور همچون بریوزوثرها و عدم حضور فرمینیفرهای بنتیک همزیست دار مشخص می­گردد، در برش مورد مطالعه مشاهد نشده است.

واژگان کلیدی
سازند قم، الیگو-میوسن، رمپ، مدل رسوبی

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