بررسی پهنه‌های اسکارنی، شیمی کانی‌ها و شرایط تشکیل اگزواسکارن کانسارآهن بیشه (جنوب بیرجند)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی بیرجند

2 دانشگاه فردوسی مشهد

3 دانشگاه بیرجند

چکیده

در منطقه بیشه، هورنبلند دیوریت­های پورفیری در سنگ­های آهکی و توفی نفوذ نموده و اسکارن تشکیل داده­اند. گارنت و پیروکسن به ترتیب فراوانترین کانی­های اگزو اسکارن پیشرونده هستند. در مرحله پسرونده، اپیدوت، ترمولیت-اکتینولیت، کوارتز، کلسیت و کانی­های کدر از جمله مگنتیت تشکیل شده­اند. نتایج تجزیه ریزپردازش الکترونی نشان داد که گارنت‌های مورد بررسی به صورت محلول‌ جامد آندرادیت و گروسولاریت هستند. گارنت‌های مورد بررسی تغییرات ناگهانی و نوسانی در نسبت Fe3+/Al دارند که این پدیده نتیجه تغییر شرایط محلول­های گرمابی طی رشد است. پیروکسن‌های مورد بررسی، به عضو انتهایی دیوپسید نزدیک هستند به‌طوری‌که کمترین مقدار دیوپسید در آنها 97/64 درصد است. بر اساس ترکیب گارنت‌ها و پیروکسن‌ها، متوسط مقدار لگاریتم گریزندگی اکسیژن 18/20- مگا پاسکال محاسبه گردید. حضور مگنتیت، پیریت و پیروتیت به همراه کلسیت و کوارتز در مجموعه کانیایی پسرونده نشانگر دمای کمتر از 430 درجه سانتیگراد و گریزندگی گوگرد حدود  10-7 محلول­های دگرنهاده کننده است.     

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of skarn zoning, minerals chemistry and conditions for formation of exoskarn in Bisheh iron deposit (south of Birjand)

نویسندگان [English]

  • Malihe Nakhaei 1
  • Seyyed Ahmad Mazaheri 2
  • Mohammad Hasan Karimpour 2
  • Seyyed Saeid Mohammadi 3
1 Birjand university of technology
2 Ferdowsi University of Mashhad
3 University of Birjand
چکیده [English]

In the Bisheh area, intrusion of hornblende porphyry diorite in limestone and tuffs rocks caused skarn formation. Garnet and pyroxene are the most abundant minerals in prograde exoskarn, respectively. In retrograde processes, epidote, tremolite-actinolite, quartz, calcite and opaque minerals such as magnetite were formed. Electron microprobe analysis shows that the studied garnets are andradite-grossular solid solution. Studied garnets show variations in Fe3+/Al ratio that is related to changing conditions during growth. Studied pyroxenes are very close to diopside end member and lowest diopside content is 64.97%. Based on garnet and pyroxene composition, the average  logarithm of oxygen fugacity is calculated -20.18 megapascal. The presence of magnetite, pyrite and pyrrhotite along with calcite and quartz show that metasomatism fluids probably had ƒS2~10-7 and temperature < 430°C.  

کلیدواژه‌ها [English]

  • Skarn
  • electron microprobe analysis
  • Bisheh

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  • تاریخ دریافت: 08 تیر 1401
  • تاریخ بازنگری: 27 مرداد 1401
  • تاریخ پذیرش: 05 شهریور 1401

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