سنگ‌نگاری، محیط رسوب‌گذاری و کانه‌زایی مس در لایه‌های رسوبی قرمزرنگ، شمال تربت حیدریه (حوضه رسوبی کدکن)
محورهای موضوعی :
کلید واژه: چینه‌سان تربت‌حیدریه لایه‌های قرمز رنگ مس رسوبی.,
چکیده مقاله :
كانيسازي مس در حوضه رسوبی کدکن به‌صورت عدسي شکل و چینه‌سان و احتمالاً از نوع كانسارهاي مس با ميزبان طبقات قرمز مي‌باشد. كانيسازي عمدتاً به‌صورت پراكنده و محدود به واحدهاي ماسه‌سنگي- مارني قرمز رنگ با ميان‌لايه‌هاي ضخيم و صخره‌ساز، كنگلومرا با سن ائوسن- اليگوسن و شامل کانی‌های اولیه کالکوپیریت، پیریت و كالكوسيت و کانی‌های ثانویه كوليت، مالاكيت و آزوريت است. با توجه به یافته‌های به‌دست آمده، کنترل کانی‌سازی در این ماسه‌سنگ‌ها در ارتباط با میزان دگرسانی فلدسپارها، تمرکز رس‌ها و مواد آلی می‌باشد. ماسه‌سنگ‌ها از نوع آركوز، ليتيك آركوز و فلدسپاتيك ليتارنايت ساب مچور ريزدانه آهن‌دار، متوسط تا ضخيم لایه و به رنگ قرمز روشن تا خاكستري تيره مي‌باشند که در محیط دلتای تحت تاثیر رودخانه و حاشیه فعال نهشته شده‌اند. نتايج به دست آمده گوياي آن است كه تيپ كاني سازي در منطقه مورد مطالعه از نوع كانسارهاي مس با ميزبانی طبقات قرمز می‌باشد.
Copper mineralization in the Kadkan sedimentary basin occurs as stratiform and lenticular shape and it seems to be redbed type sediment-hosted copper deposits. Mineralization is mainly dispersed and confined to the red sandstone- marl units with thick interbeds of Eocene-Oligocene conglomerate and includes primary ore minerals: chalcopyrite, pyrite and chalcocite and secondary ore minerals: covellite, malachite and azurite. By considering the obtained results, control of mineralization in these sandstones is in relation with alteration of feldspars, concentration of clays and organic matter. Sandstones are medium to thick in thickness, bright red to dark gray in color and are classified as arkose, lithic arkose and iron bearing fine-grained submature feldspatic litharenite that were deposited in a river-dominated deltaic environment and active margin. The potential of sediment-hosted copper mineralization decreases in the redbeds from east to west (Kadkan) of the region. The results indicate that the copper mineralization in the study area is redbed type sediment-hosted copper.
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