زمین شیمی و کانه‌زایی پهنه کانسنگ یال شرقی در کانسار روی-سرب- باریت مهدی‌آباد، استان یزد

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه بین المللی امام خمینی (ره)

2 شرکت پیشگامان صنعت سرب و روی مهدی‌آباد

چکیده

کانسار روی – سرب – باریت مهدی‌آباد در پهنه ساختاری ایران مرکزی و 116 کیلومتری جنوب شرقی یزد قرار دارد. سنگ میزبان کانسار، سنگ‌ آهک دولومیتی سازند تفت به سن کرتاسه پیشین است. مهمترین کانه‌های اقتصادی در پهنه کانسنگ یال شرقی کانسار مهدی‌آباد، همی‌مورفیت، هیدروزینسیت، سروزیت و کالکوفانیت هستند. بافت کانسنگ بیشتر جانشینی، برشی و پرکننده فضای خالی است. در اثر فرآیندهای برونزایی و هوازدگی، کانی‌های سولفیدی اسفالریت و گالن به کانی‌های غیرسولفیدی همی‌مورفیت، هیدروزینسیت و سروزیت تبدیل شده‌اند. نتایج تجزیه شیمیایی نشان می‌دهد که عناصر موجود در کانسنگ به سه گروه عناصر خاکزاد، سازنده سنگ میزبان و کانسنگ‌ساز تقسیم می‌شوند. تشکیل دولومیت‌های غنی از آهن، آنکریت و سیدریت، غلظت بالای عناصر آهن و منگنز در سیال کانه‌زا را نشان می‌دهد. با توجه به نتایج بررسی­های انجام شده، کانسار مهدی‌آباد، بسیار شبیه کانسارهای نوع دره ‌می‌سی‌سی‌پی است.     

کلیدواژه‌ها


عنوان مقاله [English]

Geochemistry and mineralization of the East Ridge ore zone in Mehdiabad zinc-lead- barite deposit, Yazd Province, Central Iran

نویسندگان [English]

  • Mehrdad 1
  • Bonyadi 1
  • Hosseini 1
  • Bayati 2
1
2
چکیده [English]

Mehdiabad zinc-lead-barite deposit is located in the Central Iran structural zone and about 116 km southeast of Yazd. The host rock of this deposit is Lower Cretaceous dolomitic limestone of the Taft Formation . The main ore minerals in the Mehdiabad East Ridge ore zone include hemimorphite, hydrozincite, cerussite, and chalcophanite. Ore textures are mainly replacement, brecciated, and open-space filling. As a result of supergene and weathering processes, the sulfide minerals (sphalerite and galena) have been changed to non-sulfide minerals such as hemimorphite, hydrozincite, and cerussite. Statistical analysis of geochemical data indicates that the elements in the ore could be divided into three groups: terrigenous, host rock-forming, and ore-forming elements. Formation of iron-rich dolomite, ankerite, and siderite indicates high concentrations of iron and manganese in the mineralizing fluid. Based on this study, the characteristics of the Mehdiabad deposit are very similar to the Mississippi-Valley type deposits.
 

کلیدواژه‌ها [English]

  • Geochemistry
  • Genesis
  • East Ridge
  • Mehdiabad lead and zinc deposit
  • MVT deposits
  • Yazd
  • Central Iran
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