نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

کانی‌شناسی و شیمی کانی‌های پهنه دگرسانی به منظور تعیین شرایط کانی‌سازی در کانسار آهن چوره‌ناب (البرز غربی)

نویسندگان
1 دانشگاه خوارزمی
2 سازمان زمین شناسی
3 البرز، کرج، مرکز تحقیقات فرآوری مواد معدنی ایران
چکیده
کانسار آهن چوره ­­ناب در منتهی ­الیه شمال­­غربی محدوده زنجان-ذاکر واقع شده است. این کانسار در توده ­های کوارتزمونزونیتی، سینوگرانیتی و گرانودیوریتی الیگوسن تزریق­ شده به درون واحدهای آتشفشانی (آندزیتی) و رسوبی کامبرین زیرین (سیلتستون، توف و ایگنمبریت) در ایالت فلززایی طارم-هشتجین واقع در البرز غربی، تشکیل شده است. کانی­ سازی آهن در کانسار چوره­­ ناب به صورت برشی، توده‌ای، پراکنده و از نوع رگه-رگچه‌ای رخ داده است. کانی­های اصلی دگرسانی، شامل اکتینولیت، آلبیت، مگنتیت، اپیدوت، فلوگوپیت، آلکالی فلدسپار و بیوتیت هستند. کانی­ های اصلی سولفیدی در کانسار چوره ­ناب، پیریت، کالکوپیریت و بورنیت هستند. براساس بررسی­ های صحرایی و کانی­ شناسی، شش نوع دگرسانی اصلی، شامل سدیک - کلسیک، پتاسیک، پروپیلیتیک، سریسیتی، سیلیسی و آرژیلیک در کانسار چوره ­ناب شناسایی شد. دگرسانی­ های سدیک-کلسیک (آلبیت-اکتینولیت-مگنتیت)، عمده­ ترین دگرسانی همراه با مگنتیت توده ­ای و برشی در بخش­ های عمیق است. دگرسانی کلسیک (اکتینولیت) و پتاسیک (بیوتیت ثانویه) در سطوح میانی در داخل و اطراف کانی­ سازی رگه - رگچه ­ای سولفیدی و در نهایت دگرسانی پروپیلیتیک (کلریت- اپیدوت) در سطوح کم­ عمق کانسار مشاهده می­ شوند. بر اساس نتایج تجزیه شیمیایی، کلینوپیروکسن­ های موجود در پهنه­‌های دگرسانی (عمدتاً سدیک- کلسیک)، از نوع اوژیت هستند. پلاژیوکلازها، دارای گستره ترکیبی آلبیت هستند. آمفیبول­ ها کلسیک بوده و اغلب از نوع ترمولیت و منیزیوهورنبلند هستند. میکا از نوع فلوگوپیت بوده و اپیدوت عمدتاً دارای ترکیب کلینوزوئیزیت است. در نهایت، عدم حضور Cl در ترکیب آمفیبول­های کانسار چوره­ناب و حضور حداقل دو آمفیبول غنی از Cl، در تمامی کانسارهای IOCG موجود در ایالت معدنی Carajas را می­توان به عدم تأثیر مکانیسم­های جانشینی ایجاد شده توسط سیالات گرمابی غنی از Cl در طول دگرسانی سدیک- کلسیک نسبت داد.
کلیدواژه‌ها

عنوان مقاله English

Mineralogy and mineral chemistry of alteration zone in order to determine the tectonic settings and mineralization characteristics in the Choreh-Nab iron deposit (Western Alborz)

نویسندگان English

Hamed Ebrahimi Fard 1
Majid Ghasemi Siani 1
Amir Ali Tabbakh Shabani 1
Ma Nazarian 2
Behrouz Karimi Shahraki 3
1 دانشکده علوم زمین
2 پژوهشکده علوم زمین
چکیده English

The Chore-Nab iron deposit is located in the northwest of the Zanjan-Zaker district. The deposit was formed in quartz monzonite, syenogranite, and granodiorite bodies introded into Lower Cambrian volcanic (andesite) and sedimentary units (siltstone, tuff, and ignimbrite) in the Tarom-Hashtjin metallogenic province. Iron mineralization occurs as brecciated, massive, disseminated, and vein-veinlet types. Major alteration minerals include actinolite, albite, magnetite, epidote, phlogopite, k-feldspar, and biotite. The main sulfide minerals are pyrite, chalcopyrite, and bornite. Based on field and mineralogical studies, sodic-calcic, potassic, propylitic, sericitic, siliceous, and argillic alterations have been identified in the deposit. Sodic-calcic alteration (albite-actinolite-magnetite), characterized by massive and brecciated magnetite in the depth, calcic (actinolite) and potassic (secondary biotite) alteration in the middle levels associated with vein-veinlet sulfide mineralization and finally propylitic alteration (chlorite-epidote) in the shallow levels are observed. Based on the results of chemical analyses, the clinopyroxenes in the alteration zones (mainly sodic-calcic) are mostly augite and less commonly diopside. Plagioclase has a range of albite compositions. Amphiboles are calcic and often tremolite and magnesio-hornblende. Finally, the absence of Cl in the composition of the amphiboles of the Chore-Nab deposit and the presence of at least two Cl-rich amphiboles in all the IOCG deposits of the Carajas mineral province can be attributed to the lack of influence of replacement mechanisms generated by Cl-rich hydrothermal fluids during sodic-calcic alteration.

کلیدواژه‌ها English

Mineral chemistry
Alteration zones
IOCG type mineralization
subduction zone
Chore-Nab iron deposit
Zanjan-Zaker district
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