بررسی‌های زمین‌شناسی، کانی‌شناسی، زمین‎شیمیایی و زمین‌فیزیکی کانسار سرب- روی چاه خربزه، شمال‌شرق انارک، ایران مرکزی

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 گروه مهندسی معدن، دانشگاه صنعتی ارومیه، ارومیه، ایران

چکیده

کانسار سرب - روی چاه خربزه در پهنه ساختاری قطعه یزد- انارک (پهنه ایران مرکزی) و در فاصله 25 کیلومتری شمال­شرق شهر انارک، استان اصفهان واقع است. واحد گنگومرای آهکی به سن کرتاسه پسین، سنگ میزبان اصلی کانه­زایی بوده و ماده معدنی به صورت برشی، رگه - رگچه­ای، پرکننده فضای خالی، جانشینی و دانه پراکنده در آن شکل گرفته است. بررسی های کانی­شناسی نشان می‌دهند که گالن، اسفالریت، ویلمایت، همی­مورفیت و سروزیت در کانسنگ‌ها با کانی­های باطله کلسیت، دولومیت، کوارتز، کائولینیت، مسکویت - ایلیت و لیمونیت همراهی می­شوند. دگرسانی­های گرمابی غالب در ارتباط با  کانه‌زایی شامل دولومیتی شدن و لیمونیتی شدن هستند. عیار سرب و روی در کانسنگ‌ها به ترتیب در گستره 04/0 تا 10/19 و 01/0 تا 99/10 درصد وزنی است. ضرایب همبستگی محاسبه شده به روش رتبه­ای اسپیرمن نشان می­دهند که  Pb همبستگی  مثبت قوی با عناصر Cd، Cu، Sb، As، Zn و Ag دارد.  بررسی شبه مقاطع بارپذیری القائی و مقاومت ویژه ظاهری نیمرخ‌های زمین‌فیزیکی، افزایش بارپذیری و احتمال وجود کانه­زایی در راستای پهنه­های  گسلی را نشان می­دهد. بر اساس شواهدی چون ترکیب سنگ میزبان، هندسه چینه­کران، ساخت و بافت کانسنگ، ماهیت دیرزاد کانه­زایی، نبود ارتباط زایشی بین فعالیت­های آذرین و کانه­زایی، دگرسانی­های دولومیتی و لیمونیتی و مجموعه کانیایی ساده، کانسار سرب - روی چاه خربزه را می­توان در رده کانسارهای سرب -روی با سنگ میزبان کربناتی یا نوع دره می­سی­سی­پی قرار داد.

کلیدواژه‌ها

عنوان مقاله [English]

Geological, mineralogical, geochemical, and geophysical investigations of the Chah Kharbozeh Pb-Zn deposit, Central east of Anarak, Central Iran

نویسندگان [English]

  • Parastoo Golizadeh 1
  • Ali Abedini 1
  • Farhang Aliyari 2
1 Geology Department, Faculty of Sciences, Urmia University, Urmia, Iran
2 Department of Mining Engineering, Urmia University of Technology, Urmia, Iran
چکیده [English]

The Chah Kharbozed Pb-Zn deposit is located in the Yazd-Anark structural Block (Central Iran), and at 25 km northeast of the Anark city, Isfahan Province. The mineralization is mainly hosted by the Upper Cretaceous calcareous conglomerate that characterized by the brecciated, vein-veinlet, open-space filling, replacement, and disseminated ore bodies. The mineralogy of ore bodies is composed of galena, sphalerite, willemite, hemimorphite and cerussite accompanied by the calcite, dolomite, quartz, kaolinite, muscovite-illite and limonite gangue minerals. The dominant hydrothermal alteration associated with the mineralization includes dolomitization and limonitization. Abundances of Pb on ore bodies range from 0.04 to 19.10% (averaging 2.55%) and the Zn ranges between 0.01 and 10.99% (averaging 1.76%). The correlation coefficients calculated by the Spearman’s rank method shows that the Pb has a strong positive correlation with the Cd, Cu, Sb, As, Zn, and Ag. Consideration of induced polarization and resistivity pseudo-sections represents the elevated chargibilities and possible mineralization along fault zones.  Evidences such as the host rock composition, stratabound geometry, texture and structure of ore bodies, epigenetic nature of mineralization, absence of intimate genetic relation  between igneous activities and mineralization, dolomite and limonite alterations, and simple mineral assemblage support that the Chah Kharbozeh deposit can be classified as sediment-hosted lead-zinc or  Mississippi Valley-type deposits.

کلیدواژه‌ها [English]

  • Pb-Zn mineralization
  • geochemistry
  • induced polarization-resistivity
  • Chahkharbozeh
  • MVT
  • Central Iran

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سابقه مقاله

  • تاریخ دریافت: 10 تیر 1404
  • تاریخ بازنگری: 06 شهریور 1405
  • تاریخ پذیرش: 14 مهر 1404

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