بررسی کانی‌سازی، زمین‌شیمی و سیال درگیر کانسار مس‌خانکشی، استان مرکزی (ایران)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

2 گروه زمین شناسی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد تهران شمال و پژوهشکده علوم زمین وابسته به سازمان زمین شناسی و اکتشافات معدنی کشور، تهران، ایران

3 گروه مهندسی معدن، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی، واحد تهران جنوب، تهران، ایران

چکیده

کانسار مس خانکشی در استان مرکزی و در 80 کیلومتری جنوب غرب تهران واقع است. این کانسار از توالی سنگ­های آتشفشانی و آذرآواری بیشتر جنس تراکی آندزیت و آندزیت با سن ائوسن تشکیل شده است. جانشینی پیریت با کالکوپیریت و بورنیت،  بصورت بلورهای ریز کروی در زمینه میکرایتی اولیه و نیز ته­نشست این دو کانی توسط محلول­های گرمابی بصورت بلورهای نیمه شکل­دار درون رگه و رگچه‌های دولواسپارایت ناشی از تبلور سنگ­های کربناتی میکرایتی به شکل روزادی بوده است؛ آنها فرآورده­های ثانویه برونزاد را تولید نموده­اند و همراه با آذرآواری­ها و توف­های برشی وابسته نماینده یک چرخه آتشفشانی هستند که بصورت چینه کران در آن کانه­زایی مس رخ داده است. با حضور کانی­های همیافت، دگرسانی پروپیلتی در کنار سایر دگرسانی‌ها، دگرسانی معمول خانکشی بوده که شدت آن در کانه‎زایی سنگ میزبان بیشتر است. براساس نتایج بررسی­های شیمی، کانی­های آلبیت، کلسیت، کوارتز و کائولینیت در فاز اصلی حضور دارند که نشانگرحضور دگرسانی پروپیلیتی هستند و به مقدار کمتر دگرسانی آرژیلیک و اکسایش آهن را نشان می­دهند. همچنین بررسی­های زمین­شیمی خانکشی نشانگر رخداد آتشفشانی هستند و ماهیت پتاسیم قلیایی بالا دارند و در اثر فرایندهای کششی در کرانه حوضه پشت کمانی قرار گرفته­اند. میانبارهای سیال، دمای همگن­شدگی را بین 4/129 تا 1/227 درجه سانتیگراد و گستره تغییرات شوری را از 91/1 تا 4/13 درصدوزنی نمک طعام نشان می­دهند. عمق به دام افتادن میانبارهای سیال در این کانسار، کمتر از 200 متر و فشار کمتر از 74 بار است. این کانسار بر پایه ویژگی­های زمین­شناسی، کانی­شناسی، بافت و ساخت، زمین­شیمی و داده­های به دست آمده از میانبارهای سیال، قابل مقایسه با کانسارهای مس نوع مانتو است.

کلیدواژه‌ها

عنوان مقاله [English]

Geology, mineralization, geochemistry and study of fluid inclusion in Khankshi copper deposit, Markazi Province (Iran)

نویسندگان [English]

  • Rezvan Pourmasoomi 1
  • Alireza Jafari Rad 1
  • Mohammad Lotfi 2
  • Peyman Afzal 3
1 Department of Geology, Faculty of Basic Sciences, Islamic Azad University, Science and Research Branch, Tehran, Iran
2 Department of Geology, Faculty of Basic Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran
3 Department of Mining Engineering, Faculty of Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran
چکیده [English]

Khankshi copper deposit is located in Central Province about 80 km southwest of Tehran Province. This deposit is formed by sequence of volcanic and pyroclastic rocks that are mostly entailed of trachyandesite and andesite rocks with Eocene age. The substitution of framboidal pyrite by chalcopyrite and bornite in the form of micro spherical crystals in initial micrite alongside with pyroclastics and dependent tuff-breccia are representative of volcanic cycle in which copper mineralization in the form of strata bound occurred. According to the availability of similar minerals, propylitic alteration besides other alterations are regular alterations in the Khankshi that its intensity in host rock mineralization is higher. Due to XRD studies, albite, calcite, quartz and kaolinite minerals are present in the main phase that indicates more presence of propylitic alteration in comparison to argillic alteration and iron oxidation in this phase. Geochemical analysis indicates the occurrence of volcanism so that rocks in this area are volcanic and from magmatic series point of view, these rocks have high alkaline potassium nature and in terms of tectonic perspective because of tensile process these rocks are located at the edge of arcuate basin. Fluid inclusion analysis shows homogenization’s temperature between 129.4to227.1  and range of salinity is varied between 1.9 to 13.4 of salt (NaCl) weight percent. The depth of fluid trapping in this deposit is less than 200 meter and pressure is less than 74 bar. This deposit according to geological properties, mineralogy, fabric and structure, geochemical and fluid inculsion data is comparable with Manto copper deposit.

کلیدواژه‌ها [English]

  • mineralogy
  • Geochemistry
  • fluid Inclusion
  • Manto type copper
  • Khankshi

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سابقه مقاله

  • تاریخ دریافت: 25 بهمن 1402
  • تاریخ بازنگری: 18 فروردین 1403
  • تاریخ پذیرش: 08 اردیبهشت 1403

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