چينه نگاري زيستي و بوم شناسي ديرينه سازند قم در ناحیه قمصر (جنوب غرب کاشان)
الموضوعات :
طیب بینازاده
1
,
امراله صفری
2
,
حسین وزیری مقدم
3
1 - علوم
2 - دانشگاه اصفهان
3 - دانشگاهاصفهان
الکلمات المفتاحية: زیست چینه نگاری, بوم شناسی دیرینه, سازند قم, ایران مرکزی,
ملخص المقالة :
به منظور مطالعات چينه نگاري زيستي و بوم شناسي ديرينه، سازند قم در برش قمصر کاشان مورد مطالعه قرار گرفته است. برش مورد مطالعه با 313 متر ضخامت شامل سنگ آهک های متوسط تا ضخیم لایه و توده‌ای و شیل بوده كه با ناپيوستگي فرسایشی برروي سنگ‌های آتشفشانی ائوسن قرارگرفته و به وسیله آبرفت های عهد حاضر پوشیده شده است. بر اساس مطالعات انجام شده در مجموع 21 جنس و 9 گونه از روزن‌داران کف‌زی شناسایی گردید. با توجه به مجموعه روزن‌داران کف‌زی سن سازند قم در این برش روپلین- شاتین تعیین شده است. با توجه به شرایط دیرینه بوم شناسی مطرح شده، در بخش های پایین این برش (روپلین)، شرایط نوری یوفوتیک و شرایط غذایی ابتدا یوتروف و سپس مزو-الیگوتروف با شوری عمدتاً نرمال دریایی می باشد. در طی زمان شاتین، شرایط غذایی عمدتاَ مزو-الیگوتروف با شوری نرمال و شوری 40 -50 psu در نوسان می باشد. شرایط نوری نیز بین آفوتیک و عمدتاً مزو-الیگوفوتیک متغییر می باشد. روزن‌داران کف‌زی بزرگ با دیواره هیالین مانند آمفیستژینا، لپیدوسیکلیناها و نومولیتیده‌ها، در محیط‌های کم عمق با انرژي زیاد، دارای پوستۀ ضخیم‌تر و اندازه صدف کوچک‌تر و در محیط‌های عمیق، به علت کاهش شدت نور و تحرک کم آب، دارای پوسته‌های نازک‌تر و کشیده‌تر می‌باشند. نتایج حاصل از مورفومتری 186 نمونه آمفیستژینا نشان می‌دهد که عمق دیرینه آب دریا در برش قمصر (روپلین-شاتین) از کمتر از 11 متر تا کمتر از 44 متر در نوسان بوده است.
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