ارزیابی دیرین¬بوم¬شناسی گرافوگلپتیدهای نهشته¬های فلیش ائوسن، باختر
الموضوعات :نصراله عباسی 1 , حامد یاراحمدزهی 2 , سارا نخجیری 3 , علی جلالی 4 , حمید حافظی مقدس 5
1 - دانشگاه زنجان
2 - گروه زمین شناسی و مرکز تحقیقات علوم زمین, دانشکده علوم,دانشگاه آزاد اسلامی واحد زاهدان
3 - دانشگاه آزاد اسلامی واحد زاهدان
4 - دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران
5 - گروه زمین شناسی، دانشکده علوم دانشگاه فردوسی مشهد
الکلمات المفتاحية: اثر فسیل# دیرین بومشناسی# رسوبگذاری رخدادی# فلیش# خاش#,
ملخص المقالة :
رخنمونهای گسترده ای از نهشته های توربیدایتی در منطقه خاش واقع در جنوب خاوری ایران در دسترس هستند. این رسوبات از توالی چرخه ای مارن، شیل، سیلتسنگ و ماسهسنگ تشکیل شده اند که در طی جریان رسوبگذاری رخدادی تهنشست شده اند. اثر فسیلهای گرافوگلپتید فراوان از این نهشته ها جمع آوری و مورد شناسایی قرار گرفتند که شامل 17 اثرجنس هستند. این گرافوگلپتیدها در دو دسته پیش از رخداد رسوبی (توربیدایتی) و پس از رخداد قابل تفکیک هستند. اثر فسیل های پیش از رخداد رسوبی متنوع و در بسترهای گلی ایجاد شده اند و شامل Desmograpton، Helminthorhaphe، Paleodytion، Protopaleodictyon، Scolicia، Spirophycus، Spirorhaphe، Squamodictyon و Urohelminthoida میباشند. اثر فسیل-های پس از رخداد رسوبی در درون لایه های دانه درشت تر سیلت و ماسه سنگ باقی ماندهاند و بهطور نسبی از فراوانی اندکی برخوردارند و شامل Helicodromites ، Helminthopsis، ،Nereites،Paleomeandron ، Phycosiphon و Planolites هستند. برخی از اثر فسیل ها چون Paleodictyon متاثر از جریانات بستر در هنگام تشکیل نیز بوده و در جهت جریان آرایش یافته اند. به نظر میرسد بسترهای گلی پیش از رخداد توربیدایتی محل مناسبی برای اثرسازهای با منش زیستی K و بسترها پس از رخداد رسوبی مناسب فعالیت اثرسازهای درون رسوبی با منش زیستی R بوده است. چنین تحلیلهای ساختاری اثرفسیل و ارتباط آنها با شرایط محیط رسوبی در تفسیر محیط رسوبی و شرایط تشکیل نهشتههای توربیدایتی اهمیت دارد.
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