زمین‌شناسی، کانه‌زایی، زمین‌شیمی و خاستگاه کانسار چندفلزی کج‌کلاه، ‌شرق زنجان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران

2 دانشکده علوم زمین، دانشگاه تحصیلات تکمیلی علوم پایه زنجان، زنجان، ایران

3 آموزش و پرورش، زنجان، ایران

چکیده

کانسار چندفلزی کج­کلاه در ­شرق زنجان و در زیر پهنه طارم و نوار فلززایی طارم- هشتجین واقع است. این کانسار درون توده نفوذی طارم تشکیل شده است. ترکیب توده نفوذی طارم در گستره مورد بررسی کوارتزمونزونیت تا کوارتزمونزودیوریت است و کانی­های اصلی آن شامل پلاژیوکلاز، فلدسپار قلیایی، کوارتز و کلینوپیروکسن هستند. ماهیت زمین­شیمیایی توده طارم آهکی قلیایی پتاسیم بالا تا شوشونیتی و در ارتباط با خاستگاه زمین ساختی فرورانش است. کانه­زایی منگنز، مس، سرب و روی و باریت در کانسار کج­کلاه به­صورت رگه- رگچه­ای و عدسی­ شکل درون توده طارم روی داده است. کانی­های اصلی ماده معدنی در این کانسار شامل گالن، اسفالریت، کالکوپیریت، پیریت، آرسنوپیریت، پسیلوملان، پیرولوزیت، منگنایت، کالکوسیت، کوولیت، مالاکیت و گوتیت بوده و کانی­های باطله نیز شامل کلسیت، باریت و کوارتز هستند. بافت­های قابل مشاهده در این کانسار توده­ای، سوزنی، رگه- رگچه­ای، شانه­ای و گل­کلمی هستند و در مقیاس میکروسکوپی شامل بافت­های جانشینی، رگه-رگچه­ای، گل­کلمی، توده­ای، بازماندی و پرکننده فضای خالی است. فاز اول و اصلی کانه­زایی در این منطقه، کانه­زایی سولفیدی است که با فاز بعدی، کانه­زایی اکسیدی، قطع شده است. فاز اکسیدی در این کانسار شامل دو زیرمرحله کوارتز- باریت و کوارتز منگنز است. در مرحله آخر، رگه- رگچه­های کوارتز و کلسیت فازهای کانه­زایی پسین را قطع و برشی کرده­اند. الگوی عناصر نادر و خاکی نادر بهنجار شده نسبت به کندریت در نمونه‌های کانه‌دار و توده نفوذی، شبیه هم است. این امر بیانگر نقش توده نفوذی در تشکیل دگرسانی­ها و سیال های کانه­ساز در این کانسار است. کانسار چندفلزی کج­کلاه با توجه به ویژگی­های صحرایی، میکروسکوپی و زمین­شیمیایی، بیشترین شباهت را با کانسارهای چندفلزی سولفیدشدگی حدواسط دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Geology, geochemistry and genesis of Kaj-Kolah polymetallic deposit, SE Zanjan

نویسندگان [English]

  • Zahra Toulabi Far 1
  • Ghasem Nabatian 1
  • Maryam Honarmand 2
  • Maryam Afshari 3
1 Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
2 Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran
3 4- Teacher of geology, Ministry of Education, Zanjan, Iran
چکیده [English]

The Kaj-Kalah polymetallic deposit is situated in the southeastern Zanjan, specifically within the Tarom subzone and the Tarom-Hashtjin metallogenic belt. This deposit is associated with the Tarom intrusive rock. The composition of the Tarom intrusive rock in the area ranges from quartz monzonite to quartz monzodiorite, with the primary mineral constituents including plagioclase, alkali feldspar, quartz, and clinopyroxene. The geochemical characteristics of the Tarom intrusive rock exhibit a high potassium calc-alkaline to shoshonitic affinity, which is associated with a subduction tectonic setting. Manganese (Mn), copper (Cu), lead (Pb), zinc (Zn), and barium (Ba) mineralization has been occurred in the Kaj-Kalah deposit in the form of vein-veinlet and lens-shaped within the Tarem intrusive rock. The main ore minerals in this deposit include galena, sphalerite, chalcopyrite, pyrite, arsenopyrite, psilomelan, pyrolusite, manganite, chalcocite, caveolite, malachite and goethite. Gangue minerals also include calcite, barite and quartz. The primary textures observed in this deposit encompass massive, needle-like, vein and veinlet, comb, and botryoidal forms. Additionally, on a microscopic scale, the textures include replacement, vein and veinlet, botryoidal, massive, relict, and open space filling. The primary and initial phase of mineralization within this deposit is characterized by sulfide mineralization, which is subsequently intersected by the oxide mineralization phase. The oxide phase in this deposit is further divided into two subphases: quartz-barite and quartz-manganese. In the final phase of mineralization, quartz and calcite vein-veinlets intersect the earlier mineralization stages. The distribution patterns of chondrite-normalized rare and rare earth elements in both mineralized and intrusive rock samples exhibit notable similarities. This observation suggests that the intrusive rock significantly contributes to the generation of alteration and ore-forming fluids within this deposit. Based on field investigations, microscopic studies, and geochemical characteristics, the Kaj-Kalah polymetallic deposit demonstrates the greatest resemblance to intermediate sulfidation epithermal deposits

کلیدواژه‌ها [English]

  • polymetallic
  • epithermal
  • quartz monzonite
  • high potassium calc-alkaline
  • Kaj-Kalah
  • Tarom-Hashtjin
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