ذخیره مس محدوده زمین‌حسین، کمربند فلززایی دهج - ساردوئیه، جنوب‌شرق ایران: ملاحظاتی روی کانه‌زایی، دگرسانی و میانبارهای سیال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه ارومیه

2 دانشگاه شهید باهنر کرمان

3 دانشگاه تبریز

چکیده

ذخیره مس زمین­حسین به عنوان بخشی از کمربند فلززایی دهج - ساردوئیه، در 170 کیلومتری جنوب­شرق شهر کرمان واقع است. این ذخیره با سنگ­های آتشفشانی (آندزیت، آندزی­بازالت و آذرآواری­ها) و توده­های نفوذی (گرانودیوریت و گرانیت) ائوسن میزبانی می­شود. دگرسانی­های پروپیلیتی، سریسیتی، رسی- سریسیتی و سیلیسی با این ذخیره در ارتباط هستند. کالکوپیریت و پیریت مهمترین کانی­های سولفیدی درونزاد هستند که با انباشت­های کانی­های برونزاد چون گوتیت، هماتیت، لیمونیت، مالاکیت و آزوریت همراهی می­شوند. کانی­های درونزاد اغلب بافت­های رگه-رگچه­ای، داربستی و قشرگون را نشان می­دهند. برپایه ریزدماسنجی در بلورهای کوارتز همزاد با کانه­ها، چهار نوع میانبار سیال دو فاز غنی از مایع (L-V)، سه فازی مایع- گاز- جامد(L-V-S) ، دو فازی غنی از گاز (V-L) و تک فازی گازی (V) بر اساس مقادیر فازی وجود دارند. نتایج ریزدماسنجی نشان می­دهند که میانبارهای سیال دارای گستره دمای همگن­شدگی گسترده­ای (170 تا 530 درجه سانتی­گراد) هستند. میانبارهای سیال نوع L-V-S دمای همگن­شدگی و شوری به ترتیب 473-190 درجه سانتی­گراد و 6/55-4/31 درصد معادل وزنی نمک طعام دارند. میانبارهای دوفازی غنی از مایع (L-V) شوری­هایی در گستره 45/6-74/1 درصد معادل وزنی نمک طعام را نشان می­دهند. بر اساس یافته­های ریزدماسنجی، جوشش، آمیختگی و سرد شدن ساده سیال­ها، ­ساز و کار­های موثر در نهشت و گسترش این ذخیره بوده­اند. سیال های کانسنگ­ساز به احتمال بسیار خاستگاه ماگمایی و ماگمایی- جوی داشته­اند. بر اساس ویژگی­های بافتی و ساختی، انباشت­های کانیایی دگرسانی و کانی­زایی و داده­های ریزدماسنجی، ذخیره زمین­حسین می­تواند در رده مس نوع پورفیری قرار گیرد.      

کلیدواژه‌ها

عنوان مقاله [English]

The copper deposit of the Zamin Hossein district, Dehaj- Sarduiyeh metallogenic belt, SE Iran: Constraints on ore mineralization, alteration, and fluid inclusions

نویسندگان [English]

  • Khaleghi 1
  • Abedini 1
  • Ranjbar 2
  • Calagari 3
1
2
3
چکیده [English]

The Zamin Hossein copper deposit, as a part of the Dehaj- Sarduiyeh metallogenic belt, is located about 170 km southeast of Kerman city. This deposit is accompanied by Eocene volcanic (andesite, andesi-basalt and pyroclastic) and Eocene intrusive body (granodiorite and granite). The propylitic, sericitic, argillic-sericitic and silicic alterations are associated with this deposit. Chalcopyrite and pyrite are the most important hypogene sulfide minerals which are accompanied by supergene mineral assemblages such as goethite, hematite, limonite, malachite, and azurite. The hypogene minerals show generally vein-veinlet, stockwork and crustiform textures. The microthermometric studies in quartz crystalscogenetic with the ore minerals revealed four types of fluid inclusions on the basis of phase content: 1-( L-V), 2-(L-V-S), 3-(V-L), and 4-(V). The results of microthermometric analyses revealed that the fluid inclusions have a wide range of Th (170°C to 530°C). The L-V-S type fluid inclusions displayed Th and salinity ranges of 190-473°C and 31.4-55.6 wt% NaCl eq., respectively. The liquid-rich 2-phase inclusions (L-V) show salinities within the range of 1.74-6.45 wt% NaCl eq. Based upon microthermometric data, boiling, mixing, and simple cooling of the fluids were the essential mechanisms in deposition and evolution of this deposit. The ore-forming fluids were probably of magmatic and mixed magmatic-meteoric sources. According to the structural and textural aspects, alteration and mineralization of mineral assemblages and microthermometric data, the Zamin Hossein ore deposit can be categorized as porphyry copper-type.
 

کلیدواژه‌ها [English]

  • Dehaj-Sarduiyeh
  • Mineralization
  • Zamin Hossein deposit
  • alteration
  • fluid inclusions
  • porphyry copper

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  • تاریخ دریافت: 28 اردیبهشت 1400
  • تاریخ بازنگری: 29 تیر 1400
  • تاریخ پذیرش: 06 مرداد 1400

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