بررسی انواع ترکیبات آلی و نقش آنها در ته‌ نشینی و کانه‌ زایی فسفات در کانسار فسفات کوه‌ سفید، رامهرمز

زمین شناسی اقتصادی

مقاله 5، دوره 9، شماره 1 - شماره پیاپی 16، تیر 1396، صفحه 159-174   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v9i1.49329

نویسندگان

هوشنگ پورکاسب^* ؛ علیرضا زراسوندی؛ زهرا فریدونی؛ بابک مختاری؛ ندا میرزایی

شهید چمران اهواز

چکیده

کانسار فسفات کوه‌سفید در کمربند زاگرس چین‌خورده ساده در شمال‌شرق استان خوزستان، شهرستان رامهرمز واقع است. سازند پابده با سه بخش بالایی (کانه‌زایی فسفات)، میانی (کانی‌های اکسیدی) و شیل‌‌های زیرین (مواد آلی همراه کانه‌زایی) میزبان کانه‌زایی است. هدف این پژوهش، بررسی انواع ترکیبات آلی همراه کانه‌زایی فسفات است. بنابراین 12 نمونه از واحد‌های فسفاته و شیلی برای بررسی‌های کانی‌شناسی، XRD، FTIR و راک ایول برداشت شد. بررسی مقاطع میکروسکپی نشان داد که اجزای فسفاته شامل پلت، اائید، اینتراکلاست، خرده استخوان و میکروفسیل‌هاست. بررسی‌های XRD و FTIRباند‌های معدنی– آلی مانند OH، OH کربوکسیلیک، C=O اسید‌های کربوکسیلیک، C≡Cآلکین، گروه CH2، C=Cآروﻣﺎﺗﯿﮏ، CHآروﻣﺎﺗﯿﮏ و آلیفاتیک همراه کانه‌زایی را مشخص کردند. کربن‌‌های آلی و قاره‌ای نیز توسط پیرولیز راک ایول تعیین شدند که نشان داد، کانه‌زایی اغلب منشأ قاره‌ای دارد و بخشی نیز حاصل تخریب مواد آلی توسط میکروارگانیسم‌هاست.

کلیدواژه‌ها

ماده آلی؛ آپاتیت؛ فسفات؛ کوه‌ سفید؛ سازند پابده

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