معرفی، بلورشناسی و پیدایش کانی اریثرایت (Co3(AsO4)28H2O) در نشانه ‌معدنی تاریک‌دره، شمال شرقی ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه فردوسی مشهد

2 دانشگاه ساسکاچوان

3 دانشگاه فردوسی مشه

چکیده

 اریثرایت (Co3(AsO4)28H2O) یکی از کانی­های کمیاب آرسنیک و از گروه وی­ویانیت است. این کانی در­ سطوح هوازده پهنه­های کانی­سازی رگه­ای آرسنوپیریت±پیریت همراه با کانی­هایی چون اسکوردایت و هیدرواکسیدهای آهن در نشانه معدنی طلا-تنگستن تاریک دره (شمال­شرقی ایران) به تازگی شناسایی شده است. اریثرایت در نمونه دستی به رنگ سرخ کمرنگ تا صورتی براق با اگرگات شعاعی و ستاره­ای بوده و در بررسی­های میکروسکوپی با کشیدگی در راستای محور c بلورشناسی دارای چند رنگی است. این کانی دارای تقارن کج­لوزی با پارامترهای یاخته یکه a = 10.251, b = 13.447, c = 4.764 , β = 104.98 و گروه فضایی C2/m است. واحدهای چاروجهی آرسنیک و هشت­وجهی­­های کبالت و آهن با اتصال اکسیژن و هیدروژن، ساختار بلوری این کانی را شکل داده­اند. در بررسی با میکروسکوپ الکترونی روبشی این کانی با ظاهری الواری نمود دارد و بررسی­های تکمیلی حضور عناصرAs  وCo  در ساختار بلوری و ترکیب شیمیایی آن را تائید نموده­است. طیف­های پراش پرتو X پهنه­های کانی­سازی حضور آرسنوپیریت را به عنوان فاز سولفیدی اصلی مشخص نمود و تجزیه به روش طیف­­سنجی جرمی پلاسمای جفت­شده القایی غنی­شدگی آنها را در عنصر کبالت نشان داد. هوادیدگی سطحی آرسنوپیریت در فراهم آوردن آبگون­های آرسنات و کاتیون کبالت برای تبلور کانی اریثرایت نقش اساسی داشته­اند. این کانی تنها در گستره اسیدیته 6 تا 8 پایدار بوده و تغییرات شرایط اکسایش-احیا در پیدایش و پایداری این کانی در منطقه مهم است وتبلور اریثرایت را کنترل می­کند.     

کلیدواژه‌ها

عنوان مقاله [English]

The emersion and crystallography of erythrite (Co3(AsO4)28H2O), discovered in Tarikdarreh area, NE Iran

نویسندگان [English]

  • Ghavi 1
  • Karimpour 1
  • Pan 2
  • Mazaheri 3
1
2
3
چکیده [English]

Erythrite (Co3 (AsO4)28H2O) is one of the rare arsenic minerals which belong to the vivianite group. A recent discovery in Tarikdarreh prospect area (northeastern Iran) found erythrite along with scorodite and hydroxides of iron have been recognized as a supergene alteration product of primary arsenic mineral in surface arsenopyrite ± pyrite mineralization veins zones. A specimen of erythrite has pale red to shiny pink color and aggregates to form into a bright red color star with a radial structure. When observed under a microscope it is elongated in C crystal axial with pleochroism. This mineral has a monoclinic system, space group C2/m and the unit-cell parameter constants are a = 10.251, b = 13.447, c = 4.764, β = 104.98. The crystalline structure of this mineral forms chains of tetrahedral of arsenic, octahedra of cobalt-iron which bind with oxygen and hydrogen. Scanning electron microscope images of this crystal exhibit a timber shape and SEM-EDX analysis have confirmed As, Co elements in this crystal structure and chemical composition. An XRD examination reveals arsenopyrite as the main sulphide phase in the mineralization zone and analysis by ICP-Mass have shown that they have high levels of cobalt element. Surface weathering of arsenopyrite has provided aqueous species of cobalt and arsenide for crystallization erythrite. On the other hand erythrite can only be stable in the range of 6 to 8 pH conditions, and then Eh-pH condition has an important role in controlling the stability and solubility of erythrite.

کلیدواژه‌ها [English]

  • Erythrite
  • arsenopyrite
  • cobalt
  • scorodite
  • Tarikdarreh

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مجله بلورشناسی و کانی شناسی ایران
دوره 26، شماره 1 - شماره پیاپی 69
فروردین 1397
صفحه 115-124

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سابقه مقاله

  • تاریخ دریافت: 02 اسفند 1395
  • تاریخ بازنگری: 08 خرداد 1396
  • تاریخ پذیرش: 07 تیر 1396

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