کانی‌شناسی و زمین‌شیمی کانسار منگنز مزرعه، جنوب‌غرب ماکو، شمال‌غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم، دانشگاه ارومیه، ایران

2 گروه مهندسی معدن، دانشگاه صنعتی ارومیه، ایران

3 گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، ایران

چکیده

کانسار منگنز مزرعه (جنوب­غرب ماکو، شمال استان آذربایجان­غربی، شمال­غرب ایران) به صورت عدسی­های پراکنده در محل همبری بازالت­های بالشی و آهک­های گودابه­ای وابسته به مجموعه افیولیتی خوی- ماکو گسترش یافته است. از نظر کانی­شناسی، کانسنگ­های این کانسار به طور عمده دربردارنده پیرولوزیت، پسیلوملان، مانگانیت و براونیت هستند که با مقادیر کمتری از هماتیت، گوتیت، کوارتز و کلسیت همراهی می­شوند. الگوی توزیع عناصر خاکی نادر بهنجار شده به کندریت همراه با برخی از شاخص­های زمین­شیمیایی مربوط به لانتانیدها چون La/Ce، (La/Nd)n و (Dy/Nd)n خاستگاه گرمابی را برای این کانسار نشان می­دهند. این امر را برخی از نمودارهای زمین­شیمیایی از جمله Co/Zn در برابر Co+Ni+Cu، Zn-Ni-Co و Mn-Fe-[Co+Ni+Cu]×10 و نسبت­های عنصری چون Mn/Fe، SiO2/Al2O3، U/Th و Co/Zn تایید می­کنند. بالا بودن تمرکز لانتانیدها در کانسنگ­ها (به طور متوسط 767 گرم در تن) نسبت به ذخایر گرمابی منگنز شناخته شده تاثیرات فرایندهای درونزایی بر کانسار را آشکار می­سازد. رخداد بی­هنجاری منفی Eu و Ce بیانگر دمای پایین سیال­های گرمابی مسئول کانه­زایی است. وجود مواد آواری در کانسنگ­ها را می­توان از تمرکز اکسیدهایی چون Al2O3 و SiO2 نتیجه گرفت.        

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogy and geochemistry of the Mazraeh manganese deposit, southwest of Maku, NW Iran

نویسندگان [English]

  • Akram Behjat 1
  • Ali Abedini 1
  • Farhang Aliyari 2
  • Ali Asghar Calagari 3
1 Department of Geology, Faculty of Sciences, Urmia University, Urmia, Iran
2 Department of Mining Engineering Urmia University of Technology, Urmia, Iran
3 Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
چکیده [English]

The Mazraeh manganese deposit (southwest of Maku, north of West-Azarbaidjan Province, NW Iran) is developed in the form of scattered lenses at the contact of pillow basalts and pelagic limestones, belonging to the Khoy-Maku ophiolitic complex. Mineralogically, the ores mainly contain pyrolusite, psilomelane, manganite, and braunite which are accompanied by lesser amounts of hematite, goethite, quartz and calcite. The distribution pattern of REE normalized to chondrite along with some geochemical parameters related to lanthanides, such as La/Ce, (La/Nd)n and (Dy/Nd)n, show a hydrothermal origin for this deposit. This idea is supported by some geochemical diagrams (Co/Zn vs. Co+Ni+Cu, Zn-Ni-Co, and Mn-Fe-[(Co+Ni+Cu)]×10) and elemental ratios such as Mn/Fe, SiO2/Al2O3, U/Th, and Co/Zn. The high concentration of lanthanides in ores (on average of 767 ppm), compared to known hydrothermal manganese deposits, reveals the effects of diagenetic processes on this deposit. The occurrence of negative anomalies of Eu and Ce indicates the low-temperature hydrothermal fluids, responsible for the mineralization. The presence of detrital materials in the ores can be inferred by the concentration values of oxides like Al2O3 and TiO2.

کلیدواژه‌ها [English]

  • ophiolite
  • Geochemistry
  • Manganese
  • hydrothermal
  • pyrolusite
  • Mazraeh
  • Maku

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  • تاریخ دریافت: 19 بهمن 1401
  • تاریخ بازنگری: 24 فروردین 1402
  • تاریخ پذیرش: 12 اردیبهشت 1402

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