نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده علوم زمین، دانشگاه شهید بهشتی تهران، تهران، ایران

چکیده

در این مطالعه به بررسی محیط رسوبی، برخاستگاه و جایگاه زمین­ساختی ماسه‌سنگ‌های سازند آب­حاجی (ژوراسیک پیشین) در برش‌های چشمه­بخشی و سرتخت­شتران، واقع در بلوک کلمرد پرداخته شده است. تجزیه و تحلیل رخساره‌های رسوبی در این برش‌ها حاکی از وجود سه مجموعه رخساره­ای آواری شامل: رخساره‌های دشت دلتایی، رخساره‌های جلوی دلتا و رخساره‌های انتهای دلتا و نیز دو رخساره کربناته مرتبط با سد است. نتایج حاصل از تجزیه مدال و داده‌های ژئوشیمیایی به برخاستگاه زمین‌ساختی کراتون و چرخه مجدد و سنگ مادر رسوبی کوارتزی (حاصل چرخه مجدد رسوبی) اشاره دارند. همچنین استفاده از نمودارهای تفکیکی جایگاه زمین‌ساختی حاشیه غیرفعال قاره­ای را برای ماسه سنگ‌های آب حاجی نشان می‌دهد. شاخص‌های شیمیایی دگرسانی(آلتراسیون) (CIA) و دگرسانی پلاژیوکلاز (PIA) محاسبه شده، میزان هوازدگی در منطقه منشأ را متوسط تا شدید معرفی می‌کند. این امر با نتایج سنگ نگاری و تجزیه مدال ماسه‌سنگ­ها مبنی بر وجود شرایط آب و هوای مرطوب تا نیمه مرطوب همخوانی دارد.
 

کلیدواژه‌ها

 
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