بررسی کانی‌سازی، زمین‌شیمی و میانبارهای سیال ذخیره چندفلزی نوع رگه‌ای شلنگ، جنوب غربی کرمان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه ارومیه

2 دانشگاه تبریز

چکیده

 ذخیره چندفلزی نوع رگه­ای شلنگ (جنوب غربی شهر کرمان) در بخش مرکزی کمربند فلززایی دهج- ساردوئیه قرار دارد. سنگ­های درونگیر این ذخیره شامل واحدهای توف شیشه­ای، توف بلوری، آندزیت و داسیت (به سن ائوسن) هستند. دگرسانی­های وابسته به این ذخیره شامل پهنه­های پروپلیتی، آرژیلی حد واسط، سیلیسی و کربناتی هستند. کانه­زایی بیشتر به صورت رگه- رگچه ای در دو مرحله جداگانه درونزاد (کالکوپیریت، پیریت و مگنتیت) و برونزاد (بورنیت، کالکوسیت، مالاکیت، آزوریت و هماتیت) رخ داده است. کانی­سازی درونزاد نیز در دو دوره مجزا رخ داده است، (1) در زمان تشکیل رگه/رگچه های کوارتز- سولفید و  (2)  هنگام گسترش رگه/رگچه­های کربنات- سولفید. مقادیر متوسط مس، سرب، روی، طلا و نقره در رگه/ رگچه­های کانه­دار به ترتیب 5/2 در صد وزنی، 26/0 در صد وزنی، 16/0 در صد وزنی،  3/1 گرم در تن و  28 گرم در تن هستند. بی­هنجاری­های مثبت قوی Eu (03/5-31/10) و Ce (48/1-06/5) به ترتیب نشان دهنده pH قلیایی محیط نهشت و ماهیت احیایی سیال­های کانسنگ­ هستند. بررسی­های ریزدماسنجی میانبارهای سیال در بلورهای کوارتز همزاد با کانی­های سولفیدی صورت گرفت. میانبارهای سیال مورد بررسی به طور عمده از نوع دو فازی غنی از مایع (L+V) هستند و همه آنها به فاز مایع همگن شده اند. دماهای همگن­شدگی(Th)  به دست آمده در میانبارهای سیال مورد بررسی در گستره 226 تا 313 درجه سانتی­گراد تغییر می­کنند. شوری های میانبارهای مورد بررسی نیز دارای گستره تغییراتی از 4/3 تا 9/9 درصد وزنی معادل نمک طعام هستند. بر اساس نتایج ریزدماسنجی میانبارهای سیال، جوشش همزمان با سرد شدن سازوکار اصلی در گسترش و تکامل این ذخیره محسوب می­شود. حضور بافت­های گل کلمی، شانه­ای، قشرگون، دانه­ای، پرمانند، برشی، تیغه­ای و جانشینی در کانسنگ­ها، گسترش دگرسانی­های آرژیلی حدواسط و کربناتی و شوری پایین میانبارهای سیال مورد بررسی، شواهد متقاعد کننده­ای فراهم می نمایند مبنی بر اینکه ذخیره نوع رگه­ای شلنگ بیشترین شباهت را به کانسارهای وراگرمایی (اپی­ترمال) با سولفیدشدگی پایین دارد.      

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of mineralization, REE geochemistry, and fluid inclusions studies of the Shalang vein-type polymetallic ore deposit, southwest of Kerman

نویسندگان [English]

  • mohammad Salehi Tinoon 1
  • Ali Abedini 1
  • AliAsghar Calagari 2
1 Urmia University
2 University of Tabriz
چکیده [English]

The Shalang vein-type polymetallic ore deposit is located about 10 km southwest of Kerman and 70 km northeast of Sirjan, and lies in the central part of the Dehaj-Sarduieh metallogenic belt. This deposit is hosted by dacitic and andesitic vitric and crystal tuffs along with andesitic-dacitic lava flows of Eocene age. The alteration zones related to this deposit are propylitic, intermediate argillic, silicic, and carbonatized. Mineralization occurred principally as veins/veinlets in two separate stages, the hypogene (Chalcopyrite, Pyrite, Magnetite) and the supergene (Bornite, Chalcocite, Malachite, Azurite, & Hematite). The hypogene mineralization also took place in two distinct episodes, (1) formation of quartz-sulfide veins/veinlets and (2) development of carbonate-sulfide veins/veinlets. The average concentration values of cu, Pb, Zn, Au, and Ag within the ore-bearing veins/veinlets are 2.5%, 0.26%, 0.16%, 1.3ppm, and 28ppm, respectively. The strong positive anomaly values of Eu (5.03-10.31) and Ce (1.48-5.06) indicate an alkaline pH and reduced nature, respectively for the ore-forming fluids in the depositional environment. The microthermometric studies on fluid inclusions within the cogenetic quartz crystals were carried out. The studied fluid inclusions were chiefly of liquid-rich two-phase type and all of them were homogenized into liquid state. The obtained homogenization temperatures (Th) of the analyzed fluid inclusions varied within the range of 226º-313ºC. The salinities of the studied fluid inclusions range from 3.4wt% to 9.9 wt% NaCl equivalent. Based upon microthermometric results, the boiling concurrent with cooling were two essential mechanisms in development and evolution of this deposit. Presence of colloform, cockad, blabed, and replacement textures in the ores, development of intermediate argillic and carbonatized alteration zones, and the low salinities and temperatures of the studied fluid inclusions provide persuasive evidence that the Shalang vein-type polymetallic ores have the most similarity to the low-sulfidation epithermal deposits.

کلیدواژه‌ها [English]

  • Mineralization
  • alteration
  • fluid inclusions
  • low-sulfidation epithermal
  • Shalang ore deposit
  • Dehaj-Sardueih

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  • تاریخ دریافت: 24 آذر 1397
  • تاریخ بازنگری: 03 بهمن 1397
  • تاریخ پذیرش: 07 اسفند 1397

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