کنودونت‌های تریاس پیشین سازند سرخ‌شیل در برش چینه‌شناسی رباط شور (باختر طبس، خاور ایران مرکزی) و بررسی ضریب تغییر رنگ آنها در ارتباط با توان تولید هیدروکربور
الموضوعات :
عبیر عیسی
1
,
عباس قادری
2
,
محمد خانه باد
3
,
تیا کولار- جورکاوسک
4
1 - دانشجوي دکتري چينه‌نگاری و دیرینه‌شناسي، گروه زمين‌شناسي، دانشکده علوم، دانشگاه فردوسي مشهد، مشهد، ايران
2 - گروه زمين‌شناسي، دانشکده علوم، دانشگاه فردوسي مشهد، مشهد، ايران
3 - گروه زمين‌شناسي، دانشکده علوم، دانشگاه فردوسي مشهد، مشهد، ايران
4 - استاد گروه دیرینه شناسی، سازمان زمین شناسی اسوونی، لیوبلیانا، اسلوونی
الکلمات المفتاحية: تریاس پیشین, گریسباخین, اسمیتین, سرخ‌شیل, کنودونت,
ملخص المقالة :
در این پژوهش، توالی رسوبی سازند سرخ‌شیل در برش چینه‌شناسی رباط شور در باختر کفه فروافتاده طبس از دیدگاه زیست‌چینه‌نگاری مورد بررسی قرار گرفته است. توالی سازند سرخ‌شیل در این برش با 48 متر ستبرا، متشکل از شیل، مارن و سنگ‌آهک‌های مارنی است که با گذر همشیب بر روی آخرین لایه‌های سازند جمال قرار گرفته و به طور مشابهی توسط دولومیت‌های سازند شتری پوشیده شده‌اند. در نمونه‌های برداشت شده از توالی یاد شده 9 گونه مختلف متعلق به 4 جنس کنودونتی Ellisonia، Hadrodontina، Parachirognathus و Pachycladina شناسایی شدند که برای نخستین بار از این سازند گزارش می‌شوند. مجموعه کنودونتی موجود در قالب سه بایوزون Hadrodontina aequabilis، Hadrodontina anceps و Pachycladina obliqua تفکیک شده‌اند. تاکسای مورد مطالعه با کنودونت‌هایی که پیش‌تر از قلمروهای نزدیک به ساحل و کم ژرفای تتیس باختری در جنوب و خاور اروپا در بازه زمانی تریاس پیشین (گریسباخین پسین ـ اسمیتین میانی) گزارش شده بودند، همخوانی خوبی دارند. این بایوزون‌های کنودونتی برای فهم بهتر پراکندگی و قرابت کنودونت‌های تریاس پیشین باختر آسیا، جایگاه زیست‌دیرینه‌جغرافیایی آنها و کارکردشان در زیست‌چینه‌نگاری تریاس پیشین جهت مقایسه با بایوزون‌های کنودونتی معرفی شده از دیگر نقاط جهان و در نهایت انجام تطابق زیست‌چینه‌ای مناسب با نقاط مشابه کاربرد دارند. بررسـی ضریب تغییر رنگ کنودونت‌های سازند سرخ‌شیل در زمان گریسباخین پسین بیانگر شاخص CAI=5، در اسمیتین بیانگر شاخص CAI=4 و در دینرین بیانگر CAI=6-8 می‌باشد که در محدوده عقیم برای تولید هیدروکربور قرار می‌گیرد.
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