خاستگاه و روند تکامل سیال‌های کانه‌زا در منطقه جیزوان (شمال‌غرب زنجان): بر اساس بررسی میانبارهای سیال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم و فناوری‌های همگرا، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 گروه علوم زمین، دانشگاه تبریز، تبریز، ایران.

چکیده

منطقه جیزوان با مساحت 45 کیلومتر مربع در 70 کیلومتری شمال غرب زنجان و در پهنه فلززایی طارم- هشتجین واقع است. واحدهای سنگی عمده در منطقه جیزوان شامل توالی منظمی از طبقه­های نازک لایه توف و توف برشی شده با ترکیب حدواسط تا بازیک با میان لایه‌هایی از آندزیت و بازالت به سن ائوسن است. افزون بر آن، واحدهای آتشفشانی تراکیتی و تراکی آندزیتی به سن الیگوسن نیز در منطقه گسترش دارند. در شرق منطقه، به بخش‌هایی از توالی توف و توف برشی شده، توده‌های نیمه‌عمیق کوارتز مونزونیت، مونزودیوریت و سینیت نفوذ کرده­اند. در نتیجه این رویداد و به دلیل حضور ساختارهای خطی و نفوذ سیال­های گرمابی، این سنگ­ها دستخوش دگرسانی آرژیلیک پیشرفته شده­اند. کانی‌سازی‌ کربناتی (مالاکیت) و سولفیدی مس (کالکوپیریت، بورنیت، تتراهدریت-تنانتیت و کالکوسیت-کوولیت) به همراه کانی­های پیریت، گالن، اسفالریت، آرسنوپیریت، کوارتز، کلسیت و گوتیت با بافت رگه-رگچه­ای در واحدهای نام برده گسترش یافته­اند. از بررسی میانبارهای سیال اولیه با دو فاز مایع و گاز، دماهای همگن‌شدگی از 6/95 تا °C 9/268 با بیشترین فراوانی در °C 185 ثبت شد. شوری سیال­های کانه­زا بین 65/4 تا 8/23 درصد وزنی معادل NaCl و چگالی آنها در گستره 77/0 تا 08/1 گرم بر سانتی­متر مکعب است. براساس داده‌های میانبارهای سیال، آمیختگی آب‌های ماگمایی با آب‌های جوی عامل اصلی ته­نشست عناصر فلزی و رخداد کانی‌سازی در منطقه جیزوان است. این نتایج، همپوشی بسیاری با داده­های معرف قلمرو کانسارهای فراگرمایی (Epithermal) دارند.     

کلیدواژه‌ها

عنوان مقاله [English]

The origin and evolution process of ore-forming fluids in the Jizvan area (northwest of Zanjan): based on fluid inclusions study

نویسندگان [English]

  • Nader Golshani Nasab 1
  • Ali Reza Jafari Rad 1
  • Mohsen Moayyed 2
  • Nima Nezafati 1
1
2
چکیده [English]

The Jizvan region with an area of ​​45 km2 is located about 70 km northwest of Zanjan town in the Tarom-Hashtjin metallogenic zone. The major rock units in the Jizvan area consist of a regular sequence of thin-layered tuff and breccia tuff with intermediate to basic compositions, interlayered with andesites and basalts. In addition, volcanic trachytic and porphyry andesitic rock units are also scattered in the region. Parts of the tuff and breccia tuff sequence are intruded by hypabyssal quartz monzonite, monzodiorite and syenite intrusions in the east of the region. As a result of this event, due to the presence of linear structures and the invasion of hydrothermal fluids, the above-mentioned rocks are affected by advanced argillic alteration. Carbonatic (malachite) and sulfidic (chalcopyrite, bornite, tetrahedrite-tennantite and chalcocite-covellite) copper mineralizations, along with pyrite, galena, sphalerite, arsenopyrite, quartz, calcite and goethite minerals are developed with a vein-veinlet texture in the above-mentioned units. Using the study of primary biphase fluid inclusions containing liquid and gas phases, homogenization temperatures from 95.6 °C to 268.9 °C with the highest frequency at 185 °C are recorded. The salinity of mineralizing fluids is between 4.65 and 23.8 wt% NaCl equivalent, while their density falls in the range from 0.77 to 1.08 g/cm3. Based on the fluid inclusion data, the mixing between magmatic and meteoric waters is the main cause for precipitation of metallic elements and the occurrence of mineralization in Jizvan area. These data overlap with the representative data of epithermal deposits.

کلیدواژه‌ها [English]

  • fluid Inclusion
  • Mineralization
  • epithermal
  • alteration
  • Jizvan area
  • Tarom-Hashtjin Zone

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مجله بلورشناسی و کانی شناسی ایران
دوره 31، شماره 1 - شماره پیاپی 89
فروردین 1402
صفحه 151-164

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  • تاریخ دریافت: 18 خرداد 1401
  • تاریخ بازنگری: 06 شهریور 1401
  • تاریخ پذیرش: 09 مهر 1401

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