کانی‌ شناسی، زمین‌ شیمی و منشأ لاتریت های نیکل‌ دار شمال‌ غرب نورآباد (استان لرستان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، گروه زمین شناسی، دانشکده علوم پایه، دانشگاه شهید چمران اهواز، اهواز، ایران

2 دانشیار، گروه زمین شناسی، دانشکده علوم پایه، دانشگاه لرستان، خرم آباد، ایران

3 دکتری، موسسه گوهرشناسی کیپا دانشگاه خوارزمی، تهران، ایران

4 دانشجوی دکتری، گروه زمین شناسی، دانشکده علوم پایه، دانشگاه لرستان، خرم آباد، ایران

چکیده

لاتریت­های نیکل ­دار منطقه نورآباد همراه مجموعه افیولیتی کرمانشاه در زون زاگرس مرتفع دیده می ­شوند. مجموعه افیولیتی در ناحیه مورد مطالعه شامل پریدوتیت ­های سرپانتینی‌شده، گابرو­های ایزوتروپ، کمی پلاژیوگرانیت، مجموعه دایک‌های صفحه ­ای، گدازه­ه ای بازالتی، آندزیت و رادیولاریت می‌باشد. پریدوتیت ­های این مجموعه افیولیتی شامل هارزبورژیت، لرزولیت و دونیت می ­باشند. فعالیت­ های زمین‌شاختی باعث خرد‌شدگی در این سنگ­ها شده ­است بگونه ­ای که باعث تسهیل فرآیند دگرسانی آن‌ها شده و زون­ های لاتریتی را ‌بوجود آورده است. دگرسانی سنگ‌های پریدوتیتی شامل دگرسانی ­های سرپانتینی، دولومیتی، هماتیتی و سیلیسی می­ باشد. زون لاتریتی ‌بصورت یک افق قرمز رنگ لایه ­ای و عدسی‌شکل بر روی سنگ‌های پریدوتیتی قرار دارد و توسط آهک های میوسن پوشیده شده­ است. بر اساس آنالیزهای XRD، در بخش لاتریتی کانی ­های دولومیت، کوارتز، گروه اسمکتیت و کانی ­های گروه سرپانتین وجود دارد. تعیین میزان pH محیط تشکیل لاتریت­ها بر اساس نسبت تغییرات  La/Yنشان‌دهنده حاکم بودن محیط تشکیل قلیایی برای این سنگ­ ها می‌باشد. بر طبق نمودارهای تفکیکی تشخیص سنگ منشاء، لاتریت ­های مورد مطالعه از نوع بوکسیت‌های کارستی با منشاء فوق‌بازی هستند.

کلیدواژه‌ها

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  • تاریخ دریافت: 21 خرداد 1402
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